Application of LBM in Aerospace Industry

Application of LBM in Aerospace Industry INTRODUCTION: Requirement of precision components, complicated design, stringent standards and testing, unusual size of workpiece, restrictions in conventional machining processes has lead to development of advanced machining processes shortly AMP. In past few years, there were several AMPs developed such as electric discharge machining (EDM), electron beam machining, electrochemical machining, chemical machining processes (CMP), ultrasonic machining (USM), and jet machining processes abrasive jet machining, water jet machining, laser beam machining etc. Each of these AMPs has its limitations in workpiece material, shape etc. But LBM is the one of the AMPs where almost all material can be processed. One of major advantage of LBM is its ability to machine both conductive and non-conductive materials. Laser beam machining (LBM) is one of the most widely used thermal energy based non-contact type advance machining process which can be applied for almost whole range of materials. Laser beam is focused for melting and vaporizing the unwanted material from the parent material. As of now the major application on LBM is profile cutting of geometrically complex part and making miniature holes in sheetmetal. HISTORY OF LASER: In 1917, it was Albert Einstein who first told the world about the process called Stimulated Emission which makes the laser possible. In 1957, Gordon Gould, a Columbia University student designed the first laser device in his laboratory. However the first working laser (ruby laser) was found on 16th of May, 1960 by Dr. Theodore Maiman. This demonstration of ruby laser acted as entry door to this field. Till then lots and lots of researches have been done and various lasers were found. Some of major contributions and highlights are Gas laser which used helium and neon gases by Ali Javan during 1960, semi conductor laser by Gunther Fenner in 1962, CO2 laser by Kumar Patel on 1964, Nd-YAG laser by Geusic in 1964 etc. The first excimer laser was demonstrated in 1970 by Basov et ah and it was liquid xenon which was excited with a pulsed electron beam. The first commercial application of continuous wave CO2 lasers was made during 1967 by Western Electric and the first successful industrial application of laser cutting was die-board slotting. Whereas now, lasers have been into many areas such as aerospace, die and mold manufacturing, biomechanical devices, automotive, electric, and electronic industries etc. Likewise many studies have been made to find many such lasers and also studies were done to improve / optimize the working parameters of the lasers. FUNDAMENTALS OF LASER: Light Amplification by Stimulated Emission of Radiation LASER is a device which produces a monochromatic light beam where all the waves are coherent. LASER consists of four primary components: Active medium: It contains atoms whose electrons are excited to higher energy levels by an energy source. They are solid crystals such as ruby or Nd:YAG, liquid dyes, gases like CO2 or Helium/Neon, or semiconductors such as GaAs. Excitation Mechanism: Excitation mechanisms pump energy into the active medium. Three basic method of excitation are optical, electrical or chemical. High Reflectance Mirror Partially Transmissive Mirror The major principles of Laser are stimulation, amplification and population inversion. Lasing action: When energy is applied to a laser active medium electrons are raised to an unstable energy level then spontaneously decay to a lower relatively long-lived metastable state. There is possibility to pump large amounts of energy since electrons in this state will not spontaneously return to their ground energy level; thus we can obtain a population inversion in which most of the atoms are in a metastable state. Lasing action is initiated by an electron after achieving population inversion. If the photon released is of exactly the right wavelength it will stimulate an atom in a metastable state to emit a photon of the same wavelength (Stimulated Emission). Large amount of these stimulated photons will be lost when they interfere with the sides of the lasing active medium. However if the photons travel parallel to the long axis of the optical cavity they will continue to stimulate emissions of photons having the same wavelengths which combine coherently until they reach the mirrored ends of the optical cavity. This stimulated emission continues as the beam strikes the 100% reflective mirror and gets reversed to strike against the partially reflecting mirror. A small portion of the coherent light is released while the rest is reflected back through the lasing medium to continue the process of stimulating photons. Types of Laser: There are several types of lasers available based on active medium (solid, liquid or gas), types of gases used, types of crystals used, and mode of operation (continuous wave, pulsed, q-switched) etc. But only few lasers are used for industrial application called as material processing lasers. The commonly used lasers in industries are: CO2 Gas lasers; Nd-YAG solid state laser and Excimer laser. CO2 lasers tend to be high powered (up to 3 kW) and are used in the continuous-wave mode. The Nd-YAG lasers are used in the pulsed mode and can achieve peak powers of 7-10 kW. Mechanics of Laser: The mechanism of material removal during laser beam machining includes four different stages such as: Warm up Melting, Vaporization, Chemical degradation / plasma shielding The material is heated above its melting point when a high energy laser beam is focused on workpiece surface. The melted or vaporized material is then removed by using high pressure assist gas. Unlike other processes, LBM is a thermal process and the effectiveness depends on thermal properties of the material rather than its mechanical properties. This is the major characteristics for which hard-to-machine material such as titanium alloys, super nickel alloys etc and highly brittle material such as glass, ceramics etc can be processed by LBM. NEEDS OF LASER IN AEROSPCE INSUSTRY: As mentioned earlier, lasers are employed much more in material processing industries than other industries. And current scenario of material processing, application of lasers plays a vital role in aerospace industry. The following are some of key points which explain the reason behind this: Cooling holes: Aerospace engineering technology is growing rapidly and the components are exposed to ever increasing exhaust and combustion temperatures. Hence cooling is very much required in order to withstand those high temperatures. One of method is to have cooling holes on TBC (thermal barrier coated) layers. Modern aircraft has nearly 100,000 such cooling holes which are made by laser drilling operation. Airframe weight: One of major criteria of any aircraft is the weight. Many improvements and experiments are going on to lessen the weight of airframe structure. Also it enhances low fuel consumption. High strength aluminum alloys are used for this process. It is found that almost 80% of material used in commercial aircraft and 50% material used in military aircraft is of this aluminum alloy. Laser cutting is one of highly recommended for processing this material. Reduce cost: In this present scenario, cost reduction plays an important role in any industry. With increasing price of petroleum, one of strategy is to reduce total manufacturing cost, labor cost in particular. CNC controlled motorized laser can be used for drilling and cutting purposes which reduces the manufacturing cost. MAJOR LBM PROCESSES USED IN AEROSPACE INDUSTRY: There are two major LBM processes employed in aerospace industry namely, laser drilling and laser cutting. In this report I have made some investigation on two case studies, one for laser drilling and another for laser cutting. Laser Drilling: In laser drilling process is a thermal process which incorporates high energy laser beam which is focused on particular area where the material gets vaporized to form holes on workpiece. There are two types of laser drilling process, percussion laser drilling and trepan laser drilling. Percussion laser drilling: Percussion drilling is drilling where it directly punches the workpiece material where there is no relative movement of laser or workpiece. Thus the processing time is much less when compared to trepan drilling process. Also for drilling 100,000 holes in aircraft components such as turbine blades, airfoil vanes etc, percussion drilling is recommended. Trepan drilling: This drilling involves cutting around circumference of the hole. Thus it takes more time than percussion drilling since it has to go around the circumference to make a hole on workpiece material. Laser cutting: Laser cutting process involves basic principle of mechanics of laser i.e. high energy laser beam is focused to particular area on the workpiece where the material is melted above its melting point. Then the molten material is removed by coaxial assist gas jet or induced vapor pressure thus forming the cut kerf. There are three types of laser cutting processes, laser fusion cutting, laser flame cutting and sublimation cutting. Laser fusion cutting: In this process inert gas such as nitrogen, argon etc is used as assist gas. This process fully depends on the energy of laser beam which is used for high alloyed steels. Laser flame cutting: Oxygen is used as assist gas in this process and it is widely used for low alloyed steels. This process receives some amount of energy from exothermic reaction of the workpiece material. Also the laser power is lower when compared to laser fusion cutting. Sublimation cutting: The material is molten by absorbed laser energy until it partially evaporates. This requires high power densities with much slower speeds than other to cutting processes. CASE STUDY # 1: LASER DRILLING OF MULTILAYER AEROSPACE MATERIAL Objective: As mentioned earlier, aerospace components requires thousands of cooling holes to dissipate the heat of combustion and exhaust gas. These components are given a coating called TBC thermal barrier coating to protect the components from direct exposure to the corrosive environments. Thus the objective of this case study is to investigate and optimize the optimum parameters related to quality of drilled holes on a TBC, thermal barrier coated material. Some of such parameters are mentioned in below figure. Experimental Setup: Laser system: The experiments are made using Nd-YAG JK704 laser with lens of focal length: 120mm. Oxygen is used as assist gas. Previous studies by Corcoran et al identified oxygen as the suitable assist gas for this process. The below chart shows the specification for JK704 laser system. Workpiece setup: Experiments are carried out using Rene 80 substrate coated with TBC. Here yttria stabilized zirconia is used as TBC and it is bonded with the substrate material by means of plasma sprayed MCrAlY bind coat. The material thickness is about 3.6mm. The material composition of Rene 80 is: Ni= 60.0%, Cr= 14.0%, Co= 9.5%, Ti= 5.0%, Mo= 4.0%, W= 4.0%, Al= 3.0%, C= 0.17%, B= 0.015% and Zr= 0.03% Procedure: One-at-a time approach is the traditional approach for conducting laser drilled experiments. In this approach only one parameter is changed keeping all others as constant. But this is time consuming and most importantly interactions of parameters are not considered which may lead to wrong results. Thus Taguchi type approach is considered where orthogonal array was designed to reduce the number of experiments required. From 108, the experiments are reduced to 18. Holes were drilled on Rene 80 substrate surface by percussion laser drilling using the laser system as mentioned earlier. The mean diameters were recorded using profilometer. The following output responses were recorded: Remelt layer thickness; Microcracking depth and Spalling Delamination of TBC. Results: After recording the values as mentioned in the experimental procedure, a chart was plotted which gives the direct comparison of results of 18 experiments. The Taguchi analysis gives the output responses of Remelt layer thickness and microcracking depth which can be then compared with the OEM (Original equipment manufacturer) vane airfoil standards. This is to check whether the attained values are within the mentioned values mentioned in the standards. As per OEM standards, the remelt layer thickness Higher S/N ratio is preferred in S/N analysis. By using the results from Chart 4 i.e. parameter effects plot, the optimum parameters can be obtained for laser drilling of Rene 80 sample. These optimum parameters are chosen in such a way that the remelt layer thickness, microcracking and Delamination of TBC are minimized. Based on derived optimum parameter table, microcracking confirmation tests are carried out to validate the findings. It was found that the laser drilled holes posses very little microcracking at these optimum parameters (Table 3). Three iterations were made, say A, B and C and micrographs were obtained. Conclusion of case study #1: The parameters considered for this study are pulse energy, pulse width, pulse shape, TBC density and the gas pressure. The investigation and results of above case study provides the following conclusions: Pulse energy: High pulse energy reduces the level of microcracking and low pulse energy reduces the level of melting of remelt layer thickness. It is also found that interaction occurs between pulse energy and pulse width. Pulse width: The severity of microcracking and Delamination i.e. the spalling is reduced considerably when shorter pulses are used. Pulse shape: Pulse shape do not have adherent effect on remelt layer thickness whereas in order to minimize delamination, a ramp-up pulse is recommended and to minimize microcracking, a treble pulse is recommended. TBC density: The TBC density has very little effect on the remelt layer thickness, however high density TBC yielded least delamination of bond coat and the TBC used. Gas pressure: Higher the gas pressure is better the output parameters. Gas pressure of 70 psi was found to reduce all the three output response parameters remelt layer thickness, microcracking and delamination. Some pictures showing the laser drilled holes on aircraft turbine component. CASE STUDY #2: LASER CUTTING OF AEROSPACE ALUMINIUM: One of primary goal of aerospace industry is to lessen the weight of airframe structure. This has advantage of saving fuel consumption, and hence the cost. High strength aluminum alloys were used for these applications and laser cutting is one of process which is recommended for processing high strength aluminum but there are some challenges which has limited conventional laser cutting for this application. Objective: Thus, the objective of this case study is to investigate the challenges of conventional laser cutting and study the proposed solution to overcome these challenges. Conventional laser cutting: The usage of conventional laser cutting is limited to process aluminum alloys used in aerospace application is because of two major reasons, It produces cuts with poor surface finish and Large heat affected zone (HAZ) is created. These poor machining characteristics of laser cutting decrease the fatigue life of components which is very essential for aerospace applications. The mechanisms of laser cutting process is, when a high energy laser beam is focused on the workpiece the material gets melted and vaporized and then a assist gas jet is used to drag the molten material away from the workpiece material. If these dragging requirements are not more pronounced, then the molten material may remain in the cutting edge of the workpiece which yields to very poor quality cut and also large HAZ is generated in the cut edge. These all combine to affect the overall mechanical performance of the workpiece material. The best method to improve the dragging efficiency is to increase the gas pressure of assist gas jet. This is required in order to establish a laminar boundary layer between assist gas jet and the molten material. The dragging of molten material is more efficient as a result viscous and pressure drag of the assist gas jet which are the driving force of removal of molten material from the workpiece. Gas pressure cannot be increased beyond 2 bar in conventional laser cutting as it uses converging coaxial cutting head. Any pressure more than 2 bar yields to more aerodynamic interactions. Due to this MSD mach shock disk, a normal shock wave is created which produces serious degradation in gas jet and reduces the dragging capacity. Proposed laser cutting: The drawbacks of conventional laser cutting can be addressed by using Converging diverging (supersonic) nozzle instead of coaxial nozzle Different geometrical configuration of assist gas jet such that it is in off-axis with the laser beam. Using converging- diverging nozzle, we can produce a fully expanded free-jet where MSD can be avoided. Thus we can produce cut of superior finish and also the HAZ is significantly reduced. Experimental setup: The experimental setup used for proposed laser cutting is as follows: Laser used: CO2 slab laser (Rofin DC 035) Output power: 3.5 KW Mode of operation: CW, continuous wave mode Nozzle: Self designed cutting head (supersonic head) Experiments were conducted using conventional and supersonic cutting head and results were recorded. Comparison of results: The workpiece material used fro this experiment is 2024-T3, high strength aluminum alloy. The results were recorded and compared to conventional laser cutting. It was found that the finish was superior and HAZ was reduced than conventional laser cutting. A Challenge in proposed solution: One of major drawback in proposed solution is that, for cutting complex contours the supersonic cutting head has to be changed frequently to remain tangent to the cutting direction. This drawback can be overcome by using a motorized off-axis nozzle controlled by a CNC controller. Conclusion of case study# 2: The following are the conclusion derived from above case study is that by using a cutting head supersonic, off-axis (non coaxial) nozzle can process high strength aluminum alloys with An excellent and superior finish. Negligible heat affected zone, HAZ can be obtained. Production rates can be increased since cutting speed is increased. By using a CNC controlled motorized off-axis cutting head, parts with complex contours can be processed. Labor costs can be reduced as laser is fully automated. CONCLUSION: In this report, a brief discussion about the two major laser beam machining used in aerospace industry, laser drilling and laser cutting were discussed. Also two case studies related to respective process were studied and results were mentioned. LBM is widely used in aerospace applications and more and more researches are going on to improve the current laser technology and many new trends directions were forecasted in this aerospace engineering field. REFERENCES: A.Corcoran, L.Sexton, B.Seaman, G.Bryne, The laser drilling of multi layer aerospace material systems, Journal of material processing technology (2002) A.Riveiro, F.Quintero, J.Pou, F.Lusquinos, R.Comesana, J.del Val, M.Boutinguiza and R.Soto, Laser cutting of aerospace aluminum Avanish Kumar Dubey, Vinod Yadava, Laser beam machining-A review, International Journal of Machine Tools Manufacture, 2008 The Fascinating world of sheetmetal, Dr.Hubert Bitzel Johanna Burchertt F. Dausinger, B.G. Teubner, Strahlwerkzeug Laser: Energieeinkopplung und Prozesseffektività ¤t, Stuttgart, 1995 www.optoIQ.com www.rofin.com http://en.wikipedia.org/wiki/Laser_cutting Lecture notes by Prof. A.Senthil kumar, Mechanical Engineering department, National University of Singapore, Singapore.

Henry David Thoreau: a Philosophical Reflection Essay

Henry David Thoreau was an inexhaustible writer that encompassed poetry and philosophy within his narratives and created a style of writing that, for his time, was difficult to define and categorize. Because of this his works were often overlooked for the genius that was held within them as writers of his time had already begun to stray from the traditional stances of philosophy. However, one can easily survey the works of Henry David Thoreau and do so with an immense amount of appreciation for his keen ability to contemplate and delve into the varied psyches and perspectives that man holds. And despite the difficulties in categorization it cannot be denied that Thoreau’s works were powerful and filled with brilliance. Thoreau wrote from a contemplative platform. He was not one who was frightened by solitude. Coined often as saying, â€Å"As you simplify your life, the laws of the universe will be simpler; solitude will not be solitude, poverty will not be poverty, nor weakness, weakness. † He passionately held to the understanding that in order to embrace all the wonder and beauty that the world holds we as a people needed to slow down, to observe our surroundings and embrace all that is before us. And sometimes in order to do that, more often in order to do that, one needed to disconnect and detach from distractions and things that skewed one’s vision in order to do so. Thoreau held to the belief that, â€Å"our limited view often keeps us from appreciating the harmonious interdependence of all parts of the natural world: this is not due to â€Å"any confusion or irregularity in nature,† but because of our own incomplete knowledge. † This was just one of many excerpts taken from Thoreau’s work, Walden, that expressed his elief that we have so much to gain by embracing more than our own perspectives as a singular perspective only sees from one vantage point. This particular work of Thoreau’s, Walden, really highlighted his fusion of philosophy and poetry amidst a presented narrative. And as previously mentioned, while it made it hard to categorize, Thoreau did gain notoriety for its content and his literary prowess. Thoreau was a Harvard graduate. He was a student of ancient scripture as well as one who studied literature containing Asian wisdoms and traditions. He was well versed and enjoyed covering a broad spectrum of material. He enjoyed the philosophical perspectives of Locke and Coleridge as well as holding honor and respect for Emerson, despite their different outlooks at times. It was evident in his writings that he held a great value for nature. He also found importance in seeking out God in the midst of nature’s existence. Thoreau held to this belief not just as a mere perspective but as a life philosophy as well. The evidence of such was found in that many of his greatest writings came when silence stilled the atmosphere and he was able to enter into the beauty that the earth around him held. After all it was his belief that beauty was more than just in the eye of the beholder but was actually held within one, a beholder, who was able to first perceive it. Thoreau brilliantly described his viewpoints in his explorations of human perspectives and challenged individuals to see beyond the mere surface of things. We see this demonstrated in the expression of his story, Walden. He was out in the woods, far from any other individual for two years and two months. During that time, he became one with nature in a way he found difficult to do amongst the bustling of a busy city. He provided for himself through his work laboring the land and as he was secluded in this place he was able to gain a deeper perspective of life through his silent contemplations of the life that surrounded him. It wasn’t loud, crowded and crazy, filled with opinions and demands. The wilderness provided a contemplative canvas of beauty where every possibility could be considered without the rude interruptions that often come with man’s agenda. In the Stanford Encyclopedia of Philosophy it was aptly conveyed that one of the greatest attributes or virtues of Thoreau’s writings was awareness. Thoreau had a talent for drawing his reader’s into a greater understanding of things they were not first nature to them and causing them to ponder, reflect and evaluate life in a deeper manner. Life is more than what it first appears and that in the embrace of simplicity one can begin to see and behold all that there is beyond what merely man has created himself, this was a message of great importance to Thoreau. Henry David was also an agent of change. In arousing individuals to embrace greater perspectives of life philosophies he compelled them further to change the way that they approached life. His belief was this, â€Å"We need to cherish and nurture our capability to discern the difference between the idea and reality, between what is and what ought to be. It is when we experience dissatisfaction with ourselves or with external circumstances that we are stimulated to act in the interest of making things better. † If we strive to uphold a certain value but are not actively doing things that promote our values or beliefs then there is a chasm between what is and what should be and Thoreau was not shy about addressing this issue in his writings. Ultimately Henry David Thoreau was an inspirational writer who spurred his readers on to seek out and explore a life with deeper meaning. He admonished small thinking and in the same breath imparted a sense of hope and expectation in portraying that there was more to the world than meets the eye. It was just simply in the eye of the beholder to not only see it but perceive it. This thought was brilliantly encapsulated within a timeless quote credited to Henry David Thoreau when stated, â€Å"What lies behind us and what lies ahead of us are tiny matters compared to what lives within us. † If one believes, all things are possible.

James Dean as the Iconic Rebel Figure Essay

The Oxford English Dictionary defined a rebel as â€Å"a person who resists authority, control, or convention† . These are the characteristics of James Dean’s screen personas in Nicholas Ray’s Rebel Without a Cause and Elia Kazan’s East of Eden. In a time where conformity was a dominant ideology in society, rebellion became a way to display your own individuality. Rebel Without a Cause and East of Eden both respectively deal with the vexing problem of the asocial youth who remain stubbornly delinquent against the nuclear family. Each respective film touches upon the puzzling subject of the 1950s, which is juvenile delinquency. The films also provide ammunition for the ideological rebellious behavior for teens to parody. Rebel Without a Cause and East of Eden are both concerned with young people â€Å"estranged from their communities and struggling to define themselves differently than the norm† . James Dean was an attractive rebel figure because he represented the raw-nerved emotions of being an adolescent while he also asserted a romantic, mythic notion about, which became attractive to audiences young and old. Dean’s upfront sexiness and relentless desire to imbue honor make Rebel Without a Cause and East of Eden films that withstand generational changes and remain prevalent within teenage society today. James Dean as the archetype for the ‘rebel’ character personified a decade of defiance, and his screen portrayal of the iconic rebel sparked a cult following that superseded his life. The continued relevance and renowned status of Dean’s screen persona is prevalent because of its â€Å"sympathetic treatment of adolescent anguish† that each director concentrated on. The enigmatic nature of the rebel icon made it easy for the viewing audience to grab hold and manifest their personal principles onto it. Dean was catapulted to a cult figure as he evoked the submerged pain and spoke for a generation of people who had sense of being stifled and smothered by values that were imprisoned by. Furthermore, Dean molded the formation of the â€Å"tough-but-tender† iconic teen rebel in the 1950s, and became a commodity and the legendary figure of teenage angst. Dean’s unbridled emotions both on and off screen became essential in both Rebel Without a Cause and East of Eden as they channeled the teenager in all of us . The 1950s were a time when teenagers were struggling with their own identity and this idea of conformity was oppressive to their individual growth. James Dean epitomized the ‘rebel’, as his inability to stick to confined conformity both on and off screen was a major asset during 1950s filmmaking. The rebel character that was present in both films was an attempt to glorify individuality. Dean’s protagonist characters in each respective film were alienated, vulnerable and antisocial, which were standard traits of the common rebel. The 1950s became an era where individualism had to be tempered to suit the demanded conformity. The ‘rebel’ icon as a whole offered refuge in a time where adolescents were trapped in environments created by political and social forces beyond their control, which impeded their ability to make their own choices or realize their aspirations. Filmmakers like Ray and Kazan attempted to assert their individuality by creating these rebellious characters that went against the accepted norms and fought for what they wanted to achieve. Ray was acutely aware that the recognitions of the attractive young rebel would intonate a large following, and casting the Hollywood bad-boy, James Dean, created a synergy between Dean’s screen persona, Jim Stark, and his real life counterpart. With his magnificent confusion, pained fragility, and unwavering sexiness, Dean became the template for teenage rebellion. Rebel Without a Cause exemplifies a thinly veiled attempt to search for authority that catapults into an attempt to search for an identity for oneself. On the other hand, in Kazan’s films, he exploited Dean’s screen persona as the rebel anti-hero in American movies, democratizing and linking the rebellious behavior to root in American values . This was also seen in Rebel Without a Cause; however, this idea was predominant within East of Eden. By Kazan doing this, Dean as a rebel character, but also the film East of Eden became symbolic visions and vehicles of change. The integrity of the family formed the backbone conformity in the 1950s and non-conformity based on a non-traditional family was something that had not been fully explored. The non-traditional nuclear family is something that was taboo; however, both Ray and Kazan deal with them in their respective films. In Rebel Without a Cause the use of gender-role reversal is apparent; and within East of Eden, the idea of an absentee mother is present. These non-traditional nuclear families pave the way for the rebel character that Dean personifies on screen. Dean is used as a sentimentalist with a yearning to refurbish the struggling nuclear family. Since the nuclear family played such an influential role, Hollywood saw it as worth saving and worth reconstructing. During this decade, the nuclear family dominated, so it was important to reconstruct the failing nuclear family in order to promote the conformity the government and society sorely desired; in cases where the nuclear family could not be restored, sickness or injury became the typical Hollywood scapegoat. While the nuclear family plays an important role in understanding the rebel character, the family plays a background role within the film itself. The nuclear family within Rebel Without a Cause features gender role reversal where Dean’s father is a weak pushover and is controlled by his overpowering wife, that ultimately forces Dean to react in a rebellious manner. These non-traditional gender roles confuse the teenage characters and propagate the rebellious characteristics as a mean for garnering attention. In order to right these wrongs, Jim adopts a surrogate family, whereby Judy is his wife, and Plato becomes the adoptive son. Since there is a lack of a traditional nuclear family, the escape to the abandoned mansion removes Dean from the â€Å"compromises of the real world† whereby he is able to live with Judy and Plato in an â€Å"idealized version of family life†, which is when he comes to the realization that he no longer needs to â€Å"equate masculinity with violent rebellion† and perpetuates his reintegration into society. Additionally, Elia Kazan was fascinated with James Dean’s personal struggles, which helped him connect to his rebellious character as Cal in East of Eden. Kazan used Dean’s personal problems to his advantage, exploiting them and creating a tumultuous nuclear family that mimicked the biblical tale of Cain and Abel. The â€Å"love and hate† plotline that deals with forbidden love and explosive passions is reticent of the well-known biblical tale. Cal – defiant, disobedient, and uncompromising – provokes the central conflict within the film, which impersonates his biblical counterpart Cain. Cal himself is stuck between the â€Å"brooding coast of his mother’s sin† and the â€Å"sunlit valley of his father’s righteousness†, which adjusts and brings to light the coexistence of good and evil within all of us. Cal and Aron are primary demonstrations of this good versus evil idea, as they are fighting for their father’s affections, which is a paralleled allegory of the biblical tale. However, it is also applicable to the 1950s when the film was created, and can be further adapted to fit modern society, which is why East of Eden is a timeless film. Dean’s character Cal exhibits a multitude of self-destructive behavior. As a traditional rebellious character, Dean exhibits free will and the capacity to forgive even though he begrudges his father and brother throughout the diegetic. Cal is embittered with the idea that his father favors Aron, his â€Å"perfect† twin brother. Further, Cal attempts to win his father’s undying affection by farming beans and selling them for a large profit. If Cal shows his father that he can create a successful business and repay him monies lost, he would be showered with the affection he feels deprived from. Cal’s plan backfires and instead resorts to â€Å"killing† his brother by destroying his integrity in order to gain his father’s affection and adoration. However, this plan fails and ultimately causes his father’s demise. The theme of reconciliation appears in East of Eden when Dean offers to take care of his invalid father shows his father that his intentions, while misguided, were pure and only used as a guise for his father to notice all his hard work. Dean’s concern with masculinity and manhood is at the forefront of Rebel Without a Cause. Dean exhibits â€Å"moral and psychological vertigo as he teeters on the brink of manhood† , and is concerned with masculinity as there has been an apparent lacking representation of manhood within his home life. Dean is searching for a strong and upright male figure with whom he can identify with, which was a customary representation during the 1950s. Instead of being a strong role model, Dean’s father portrayed as a craven subordinate who succumbs to the over-demanding ways of his boisterous wife. For a struggling teen, these ideals prove to be less than appropriate, which launches Dean into rebellion, in hopes of finding the role model he desperately needs and desires. In the absence of a credible adult guidance, especially from his father, Dean questions his masculinity. Furthermore, Dean equates manhood with honor. This theme of masculinity and honor is present in both Rebel Without a Cause and East of Eden. In Rebel Without a Cause Dean plays the role of the informer, which is an honorable characteristic . Informing is construed as the highest act of courage, and displays a defining moral choice. Having this moral compass helps to shape and define the man that Dean will turn in to, which is a dependable figure as he attempts to salvage Pluto’s insanity and Judy’s insecurities. Dean screen persona is concerned with not only preserving his honor, but also with surviving and thriving in a world that embodies teenage confusion. Ultimately, Dean’s reconciliation with hegemony makes a rebel honorable, possible by the virtue of its own authority and â€Å"unimpaired by psychosis, alienation, or a romanticized futility†. While Dean is a rebel within East of Eden by defying his father’s orders, he has honorable characteristics when dealing with his manhood. Integrity and honor are integral parts to Dean’s persona as he attempts to save his father and salvage his well being after an ill-advised investment. The rebel character that became a figure of non-conformity, and rugged individualism became not only a culture but also became a political stance as a way to stray from American hegemony. Ray uses Dean as a dissent of social control, in order to promote the independence that became synonymous with rebellious behavior. There was a pressure to conform that was thrust upon the young adolescents, who were already facing a confusing time during their formative years. Dean as a ‘rebel’ is espoused as the cause of the protestor and stultified the inherently violent social system. The rebel sparked debate and offered a different perspective that would not have been possible with a completely conformist hegemonic society. In order to stray from a completely hegemonic society, and defy global homogenization, America can turn iconography against itself. This was a message the Ray attempted to portray by having the rebellious characters fight each other even though ultimately they believed in the same things. Psychological and social issues became prevalent and defined the two types of rebels that were present within Rebel Without a Cause. Firstly, there is the rebel that James Dean personified with displays of reconciliation and reintegration into society; and secondly, there is a character such as Plato who was a clear representation of irreconcilable rebellion. Dean is able to be readmitted into society as his disaffection was not profound in the first place, and was used as a mechanism of expression and attention in the wake of the absence of a strong father. Additionally, Dean’s rebelliousness was sentimentalized, which furthered his reintegration. On the other hand, irreconcilable rebellion is equated to insanity, which cannot be accommodated in society, thusly forcing Plato’s death and the end of the film. While psychological issues can be discusses and presented within a film, insanity is not accepted during the 1950s, so to respond to this, it is imperative for Plato to die. With the death of Plato and the re-integration of Dean’s character, there is a theme of rehabilitation. Moreover, â€Å"once the abyss of personal isolation is bridged, rebelliousness ceases† and those who cannot experience rehabilitations have no place within the film diegetic. This was seen with Plato who was shot down, and Buzz who died during the â€Å"chicken run† he challenged Dean to. Kazan’s representation of the rebellious character in East of Eden was seen as a function of a lack of love and meaningful contact, which is why Cal’s forbidden relationship with Abra became central within the narrative. Dean’s screen persona is searching for the â€Å"authentic self† and his masculine identity, which leads him to his mother as well as his reliance on Abra. Further, Abra is the catalyst for the reconciliations between Cal and his father as she promotes the loving relationship the Cal lacks with his father. East of Eden deals with moral values in a generation where teenagers begin to question their father’s generation. Abra became a representation of purity and simplicity that helped bridge the tumultuous relationship between father and son during the period of intense personal moral dilemma for the teenage rebel. All in all, â€Å"the young rebel character that is firmly ingrained in our cultural imagination carries its traces to the Hollywood screen rebels of the fifties, none more than James Dean† . Both Rebel Without a Cause and East of Eden are dealing with the protagonist’s movement into moral orientation and their journey into self-identification, and present themselves as remedial, therapeutic, and redemptive, which explain symptoms with implied cures. Over the decades the rebel has been a particularly ambiguous icon, where the meanings often contradict one another; however, the use of James Dean as an iconoclastic rebel defined term and created the archetypal ‘rebel’ character. During the 1950s, every aspect of emerging teen culture was viewed as threatening and incomprehensible; however, the rebel character was used for teens to expand their personal boundaries during a time when the cultural landscape was largely undefined.

Immigrants in the American Society - 835 Words

United States is a multiethnic society with many foreign languages spoken, yet English is the primary form of communication. English is widely spoken around the nation, even though it is not the official language of the country. Thus, for an immigrant, it is imperative to learn English to take advantage of the opportunities that the country has to offer, and to also lessen the cases of racism and prejudice. Many immigrants do not want bi-lingual programs in school so that their children can smoothly adjust in the American society, however, learning another language does not mean eliminating the native tongue that was inherited from the ancestors. To be able to speak two languages is something to be proud of. In both of the short stories entitled, â€Å"Mother Tongue†, written by Amy Tan, and â€Å"Why and When to Speak Spanish in Public†, by Myriam Marquez, both authors emphasize the importance of learning English language, yet also demonstrate the possibilities of surv iving in the American society while preserving diverse cultural identities. Therefore, retaining cultural individualities and learning English is possible, and even though the United States is a multicultural society, the majority of people speak English, and for that reason, it should be the official language of the country. Adjustments of immigrants in the American life are very challenging. Embracing new culture and language are difficult, however it is a necessity. For instance, employers would rather give jobs toShow MoreRelatedInfluence Of Immigrants On American Society1269 Words   |  6 Pages Influence of Immigrants on American Society Immigration is what has made America what it is today. 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