The Preservation of Free

The Preservation of Freedom Essay This paper, using work from JP Sartre and Nikolai Berdyaev, will attempt a detailed explanation of existentialism relative to the formula, â€Å"existence before essence,† the defining creed, so to speak, of the existentialist movement. With Sartre, the central idea is freedom leads to torture and pain. For Berdyaev, creativity is the antidote to this pain. Creativity is to Berdyaev what Marxism became to Sartre, a way out. It seems only rational to treat these two famous existentialists as complimentary to each other. The purpose behind existentialism, in its widest meaning, is to preserve freedom in the 20th century, a century saturated with totalist movements that sought to make the human person a mere cog in a larger machine: capitalism, Leninism, Hitlerism and even globalism seek ends and goals outside the person, in the name of abstract historical forces that the individual person will help bring about (Flynn, 2006, 1-11ff). Existentialism is a rebellion against the 20th century for that reason. Philosophy should concern itself with the individual, not with â€Å"social forces† or â€Å"historical destiny. † 1. In the work of JP Sartre, freedom is not a destiny, but the fundamental fact of mankind. This fact cannot be denied. Ideology, theology, metaphysics and even psychology are means of denying this freedom, blaming other people, structures and social life or even history for the problems deriving from the choices that individuals make. This is the essence of Sartre: freedom is a curse, but a worse curse is denying that freedom in the name of some other end, some end dictated by â€Å"historical forces. † In the 21st century, such problems have not been solved, and the ego is as under siege as it has always been (Flynn, 2006, 67-69). For Sartre, freedom, ego and consciousness are one in the same object. What typifies all of these three is instability. What typifies bad faith is the desire to end this instability by attaching one’s ego to ideological objects that purport to â€Å"solve† the problem of human, historical existence. Instability and a lack of both satisfaction and community are the two hallmarks of freedom and the human condition. It is absurd precisely in that there is no solution. But if ego, consciousness and freedom are all one object, what does that mean for human behavior? It means that man is the choices he makes. Man is self created. But in this creation, man is fully responsible for what he has become in this struggle. There are no excuses. The specific argument from Sartre looks like this: a. Man is absolutely free. This means that consciousness can abstract from any object in space, or any object that exists in the consciousness of the individual itself. These are also one and the same thing. b. This means that objects exist only for consciousness. It matters not if some objects exist in themselves or not (a concept dealt with more below), but rather only that they exist for the person in question. Objects exist, then, only to the extent they are objects of consciousness, not whether or not they exist in themselves. But this further means that man creates himself, and that he creates the objects in consciousness. c. So if man is freedom, and objects exist only to the extent they exist for consciousness (and hence derive from the person, not from the outside world), then man not only creates himself, but also the world outside the self. What this leads to is torture. This is because, as man is responsible for what she becomes, and can make no excuses for this, there are no real guides, and hence, there is 100% responsibility with 0% knowledge of what is right and wrong. This is another reason life is absurd (McCulloch, 1994, 17. ) But the human person is aware that there are objects that come into consciousness, but sometimes, objects appear to be â€Å"outside† the ego’s control. In other words, that objects seem to be â€Å"brute givens,† objects in space that harm the person’s freedom in that they seem to control themselves. This is another form of torture, in that the ego is aware of its complete freedom, and yet is confronted with other objects (especially other egos) that seem to resist our control. But, like Hegel, this slowly begins to develop into some inchoate idea of community, but this is far into the future. In our case, this confrontation only really has two choices, neither of which is really pleasant: first, love. Love is unpleasant in that it is the appropriation of the other, the absorption of the other into one’s world. This is similar to Hegel’s slave/master dialectic that eventually leads to the consciousness of some form of primitive community. But for Sartre, while community is possible, it can only be reached through pain and torture. But the second way of dealing with other egos is sadism: domination, the master/slave dialectic of Hegel. In this latter option, the other ego is not seen as manifesting pure freedom, but rather being a mere object. But given the epistemology above, the object is space is what consciousness/freedom makes it, and hence, objectification or love has no moral basis, it is merely two ways of dealing with â€Å"facticity. † Both are consistent with existentialism and the idea that freedom exists prior to objects. This is another and more accurate way of saying â€Å"existence before essence. † (Sartre, 2007, 22) But the phrase â€Å"existence before essence,† by now, should be clear that both words of this couplet are misnomers. There is really no stable existence in that existence is pure freedom. The ego is free in a radical sense of being determined by nothing (including internal reasons), but, given this, there is no essence either. Freedom is not a thing that can be analyzed. It is a state, the state of all human existence (or at least, of mine). From this, one can conclude that there is no â€Å"creation,† no real external world, and hence, no god to create it (Jones, 1980, 235-236). What I am confronted by in the world are objects that seem to restrict my freedom, and I am to dominate them one way or another, either through love or though objectification. It seems that both of these are one and the same thing: both are objectified, the beloved object and the objectified object. Both of these options are about objectification and absorption: the beloved is taken into the world of the lover without regard to the beloved’s ideas of the matter, and the victim of the sadist is also an object, an object through which the ego expresses its domination over all objects presented to it. Putting it more directly, man has only an adversarial and alien existence on earth. There is no intrinsic purpose to human life and what is worse, that postulating kinds of purposes are always the best examples of bad faith and intellectual dishonesty (Levy, 2003, 166ff).

C ++ Language :: essays research papers

C++ Programming Language C++ is a universal programming language, which considerably eases and comforts the work of a professional programmer. Roundly, C++ is an enhancement of C programming language: C++ offers flexible and effective tools of determination of new data types, which help programmer to split up his work into a number of easily controlled parts. Custom data types can be composed into some objects (called classes), specified by the programmer. Such objects are simple and reliable to be used in the situations, when data types are hard to be defined on the stage of compiling. Programming by using such objects is called Object Oriented Programming, and C++ is one of the most popular OOP languages. Origin of C++ takes source from programming languages of â€Å"C with Classes†, which have been developing during early 80th at the AT&T Bell Labs. â€Å"C with Classes† has been used for big projects of modeling and testing of opportunities in programming, which required minimum of process memory and time. But â€Å"C with Classes† was not satisfying with its lack of virtual functions and links, and that is why the specialists borrowed some features and tools (like classes) from another programming language, Simula. The name â€Å"C++† has been invented by Rick Mascitti in autumn 1983; it indicates an evolutional transformation from C to C++, because â€Å"++† symbolizes the function of increment in C. Since C++ must be classified as an extension of C programming language, it did not receive a name of a higher level group of languages, â€Å"D†. Early versions of C++ proved to be efficient for solving of growing complexity of the programming problems. Standard version of C++, released in 1998, includes the Core of the language and Standard Template Library, a modified version of C Library. C++ presented a lot of new functions and opportunities for a programmer. First of all, those are features of managing with the classes, like constructors, virtual functions, or implementation of encapsulation, abstraction, polymorphism, and inheritance. Besides, C++ offers some improvements in the very programming operations, like using declarations, namespaces, function overloading, default arguments, function-like casts, run-time type identification, inline functions, and many others. Design of C++ is modern and convenient, besides, C++ supports various programming styles (like OOP, data abstraction, etc.). The main advantage of C++ is its object orientation. Strategy of OOP helps to develop a great variety of software and to satisfy growing needs of modern programming.

Residual Stress

INFLUENCE OF RESIDUAL STRESSES ON FATIGUE FAILURE OF BUTT WELDED STAINLESS STEEL PIPE Areef A Department of Mechanical Engineering Chendhuran college of Engineering and technology Pudhukkottai, Tamilnadu [email  protected] com Abstract— This project is aimed to understand the influence of residual stresses on the fatigue failure of butt welded stainless steel pipe joints. In order to carry out this study it requires an experimental fatigue failure data and a computer aided analysis of these results. A finite element scheme will be developed to simulate the residual stress in weld using the experimental data.A Thermo-elasto-plastic analysis will be used to replicate the butt welded pipe joint and the residual stress will be determined. Residual stress that arises in welded joints by heating and cooling cycles during the welding process is another major factor in fatigue failure of welded structures. Welding residual stresses might lead to a drastic reduction in the fatigue st rength of welded elements. In multi cycle fatigue (N > 106 cycles), the effect of residual stresses can be comparable to the effect of stress concentration.The effect of residual stresses on the fatigue life of welded elements are significant as regards relieving harmful tensile residual stresses and introducing beneficial compressive residual stresses in the weld toe zones. The fatigue failure can be classified in to two categories based on the number of cycles taken to fail. A. High cycle fatigue High-cycle fatigue is when the number of cycles to failure is large, typically when the number of cycles to failure, Nf is greater than 103. B. Low cycle fatigue Low- cycle fatigue is when the number of cycles to failure is small, typically when the number of cycles to failure, Nf is less than 103.III. RESIDUAL STRESS ON WELD Residual stresses can be defined as the stresses that remain within a material or body after manufacture and material processing in the absence of external forces or thermal gradients. They can also be produced by service loading, leading to inhomogeneous plastic deformation in the part or specimen. Residual stresses can be defined as either macro or micro stresses and both may be present in a component at any one time. They can be classified as: Macro residual stress that develop in the body of a component on a scale larger than the grain size of the material.Micro residual stresses that vary on the scale of an individual grain. I. INTRODUCTION Welding has a number of detrimental effects on the structural integrity and in-service performance of the weldments. These detrimental effects are due to imperfections induced by the welding in the weldments, of which the structural shape change behavior, residual stresses and the weld solidification cracks are reported to have very severe degrading effects on the mechanical strengths and possibly can lead to catastrophic failure.Fatigue is a type of fracture that occurs in welds that are subjected to c hanging or varying stresses over time. Fatigue is mainly caused by the environment in which the welded joints are utilized. Fatigue fracture is a ductile fracture, and therefore occurs by non-uniform plastic deformation. Micro cracks and voids form after a certain number of cycles and grow proportional to the number of cycles eventually grow large enough to overcome recovery mechanisms and move quickly to fracture. The rate of this crack nucleation is proportional to the frequency of the applied stress.II. FACTORS IN FATIGUE FAILURES Fatigue failures of welded joint are initiated by many factors, such as stress concentration, environment, loading and residual stresses. Stress concentration is mainly caused by the geometrical discontinuity and thus initiates fatigue crack at the locations of discontinuity. Stress concentration may also result from weld defects and metallurgical discontinuity. Fatigue strength of weld component may also be significantly affected by the environment, su ch as oxygen, sulfur, and temperature.In addition to the axial stresses in the piping systems reduction in fatigue life also takes place by multiaxiality of loading or stresses. Micro residual stresses that exist within a grain, essentially as a result of the presence of dislocations and other crystalline defects. IV. CAUSES OF RESIDUAL STRESS Residual stresses are generated during most manufacturing processes involving material deformation, heat treatment, machining or processing operations such as welding, machining, grinding, and rod or wire drawing etc.It is possible to classify the origin of residual stresses in the following way: 1. 2. 3. Differential plastic flow Differential cooling rates Phase transformations with volume changes are one of the main factors leading to the origination and propagation of fatigue cracks in welded elements. The residual stresses in the welded joints are formed as the result of differential contractions which occur as the weld metal solidifies an d cools to ambient temperature. In fact, welding introduces high heat input to the material being welded.As a result of this, non-uniform heat distributions, plastic deformations and phase transformations occur on the material. These changes generate different residual stresses patterns for weld region and in the heat affected zone (HAZ). Residual stresses induced by shrinkage of the molten region are usually tensile. Transformation induced residual stresses will cause more critical phase transformations. When the effect of phase transformations is dominant compressive residual stresses are formed in the transformed areas.Tensile residual stresses are detrimental to the initiation and growth of fatigue cracks. Weld fatigue failure is often particularly sensitive to residual stress due to stress concentrations induced by the weld joint geometry and weld imperfections. Welding residual stress acts as a booster to the fatigue problem. Hence, crack growth rate becomes considerably highe r in the weld vicinity compared to that far from weld. The fatigue failure mechanism in the presence of weld residual stress is not well understood and it is the intent of this project to explore this mechanism.However, to quantify the effects of welding residual stresses in the design stage, one has to numerically simulate its distribution and redistribution and possible relaxation in a structure due to cyclic loading. This requires the need for a robust, reliable and numerically efficient method for modeling residual stresses. Previous studies reveals that depending upon mean stress, stress amplitude, and stress ratio of uni axial cycle stressing and two kinds of failures ratcheting failure and fatigue failure. Figure 3.Explains the variation of ratcheting strain with stress amplitude. In which we shall see that stress increases apparently with the increase in nominal stress amplitude. It implies that the effect of nominal stress amplitude on ratcheting is more significant than me an nominal stress. The variation of mean stress with ratcheting strain is explained in figure 4. In which we shall see that ratcheting strain also has an increasing trend with the mean nominal stress up to a particular limit. V. EXPERIMENTAL TECHNIQUESWelding residual stresses are generated in a structure as a consequence of local plastic deformations introduced by local temperature history consisting of a rapid heating and subsequent cooling phase. During the welding process, the weld area is heated up sharply compare to the surrounding area and fused locally. The material expands as a result of being heated. The heat expansion is restrained by the surrounding cooler area, which gives rise to thermal stresses. The thermal stresses partly exceed the yield limit, which is lowered at elevated temperatures.Consequently, the weld area is plastically hot-compressed. After cooling down too short, too narrow or too small comparing to the surrounding area, it develops tensile residual stres s, while the surrounding areas are subjected to compressive residual stresses to maintain the self-equilibrium The distribution of residual stresses in a welded pipe is more complex, Fig. 1 shows the possible expansion and shrinkage in a butt welded pipe. In this case, shrinkage of the weld in the circumferential direction induces circumferential force, F, shearing force, Q, and bending moments, M, to the pipe.Figure. 2 shows a characteristic residual stress profile on a low carbon steel welded component. Also the distribution of residual stresses in a pipe is affected by many factors such as diameter, wall thickness of the pipe, weld geometry, and welding procedure. From the graphical plot we shall see that the maximum value of the harmful residual stress is about 360 N/mm2 (tensile stress) near the welding line and it decreases to be about 165 N/mm2 at the distance of 80 mm from the welding axis.The minimum residual stress is about 90 N/mm2 near the welding line and it becomes abo ut 60 N/mm2 in compression at the instance of about 60 mm, then it reduces to about 10 N/mm2 in tension at 80 mm distance from the axis. Such high tensile residual stresses are the result of thermoplastic deformations during the welding process and A. Sample Used The material used for the study is stainless steel material of grade SS304. The material is chosen because of its following properties. It has an excellent corrosion resistance in a wide range of atmospheric environments and many corrosive media.Considering its heat resistant property it is not suitable to use in a range of 425-860 °C if subsequent aqueous corrosion resistance is important. This material has excellent weld ability by all standard fusion methods, both with and without filler metals. Welding of 304 can be done with Grade 308 and 308L rods or electrodes (and with their high silicon equivalents). Heavy welded sections in Grade 304 may require post-weld annealing for maximum corrosion resistance. Tensile Stren gth (MPa) min 515 Yield Strength 0. 2% Proof (MPa) min 205 Elongation (% in 50mm) min 40 Rockwell B (HRB) max 92 Brinell (HB) max 201D. Finite element analysis Most of the residual stress studies were conducted based on either axi symmetric or 2D plane assumptions due to the limitations of the finite element codes and computer resources available during the time of the study. Moreover, the thermo-mechanical problem was assumed to be uncoupled where the thermal and mechanical responses were treated separately. Furthermore fatigue failure usually initiate at the stress concentration area and fatigue loading is usually not axi symmetric, and hence a two dimensional model can not simulate the fatigue failure response of weld joints accurately.In order to simulate the fatigue response of welded joints in the presence of residual stresses, it is essential to conduct a three-dimensional analysis. Figure 5. Illustrates the solid and FE model of the specimen RESULT AND DISCUSSION 3D finite e lement fatigue response analyses for a socketwelded joint were performed by using ANSYS. This is needed in order to include the calculated residual stress and strain fields as the initial stresses and strains in the fatigue analysis. A fixed boundary condition at the socket end is imposed.Same finite element mesh and the material model used in the residual stress analysis, are restricted to be used in the fatigue analysis. The following are some of the discussions we found out after the comparative experiments on Fatigue machine and computer aided simulation. High tensile residual stresses, at or above the yield stress level, exist near the weld toe area, especially at the weld start/stop location. The magnitude of the residual stresses reduces quickly as the distance from the weld toe increases. The residual stress distribution does not change much when the slip-on gap in the socket weld joint is reduced to zero.Hence, the increase in fatigue life of socket welds with no slip-on ga p is unrelated to residual stress. The improvement in fatigue life may come from the change in failure mode, which in turn, may be influenced by the change of the external load stress or strain distribution. REFERENCES [1] Guozheng Kang, Yugie Liu, and Zhao Li â€Å"Experimental study on ratchetting-fatigue interaction of SS304 stainless steel in uni-axial cyclic stressing† – International journal of Materials Science and engineering, Volume 435, 2006, Pages 396-404. N. S. Rossini, M. Dassisti , K.Y. Benyounis, A. G. Olabi â€Å"Methods of measuring residual stresses in components† International journal of Materials and Design, Volume 35, 2012, Pages 572–588. Y. Kudryavtsev and J. Kleiman â€Å"Fatigue of Welded Elements: Residual Stresses and Improvement Treatments† Integrity Testing Laboratory Inc. 80 Esna Park Drive, Units 7-9, Markham, Canada presented paper in the year 2005. Z. Barsoum â€Å"Residual stress analysis and fatigue of multi-pass welded tubular structures†International journal of Engineering Failure Analysis, Volume 15, 2008, Pages 863–874. M.Farajian-Sohi, Th Nitschke-Pagel, K â€Å"Residual stress relaxation in welded joint under static and cyclic loading† Issued from International Centre for Diffraction Data 2009 ISSN 1097-0002. Grade 304 Table. 1 Mechanical property of SS grade 304 Elastic modulus (Gpa) 193 Thermal conductivity (W/m. K) 16. 2 Specific heat (J/kg. K) 500 Electrical resistivity (ohm) 720 Grade Density (kg/m3) 304 8000 Table. 2 Physical property of SS grade 304 B. Stainless steel welding Methods There are three methods of stainless steel welding which are preferred over the rest.Metal Inert Gas (MIG) welding, Tungsten Inert Gas (TIG) welding, and Shielded Metal Arc Welding (SMAW). Stainless steel welding requires a bit more finesse than welding mild steel or aluminum, because heat is an enemy in this process. Also the fumes made from any of these processes are very harmf ul, and great care must be taken to avoid breathing them. TIG welding utilizes a tungsten welding electrode, a filler metal rod and an inert gas to shield the weld. This welding method requires little or no post-weld finishing. The tungsten tip in the welding torch is touched to the material to be welded.This creates an arc that the welder dips the filler metal rod into and allows it to melt into the welding puddle. The shielding gas prevents contamination from entering the weld and allows the weld to flow out smoothly. Heat is controlled through a foot switch. So the suggested welding method is TIG welding. C. Fatigue test Butt welded piping joints were tested in a cantilever setup. In these test the welded joint to be tested is located near the heavy and stiff support column. The fatigue loading cycle is applied to the other end of the pipe using the actuator of a servo- hydraulic testing machine through a pin end fixture setup.The pin end fixture consists of a self-aligning ball bearing and a pin, which is snugly fitted to the ball bearing and tightly attached to the end fixture. One of the pin end fixtures is tightly screwed to the actuator rod and the other welded to the specimen. [2] [3] [4] [5] [6] D. Akbari, I. Sattari-Far Faculty of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran â€Å"Effect of the welding heat input on residual stresses in butt-welds of dissimilar pipe joints† International Journal of Pressure Vessels and Piping, Volume 86, 2009, Pages 769–776. [7] B. Brickstad, B. L.Josefson â€Å"A parametric study of residual stresses in multi-pass butt-welded stainless steel pipes† International Journal of Pressure Vessels and Piping, Volume 75, 1998, Pages 11-25. Figure 3. Relation between ratcheting strain with stress amplitude Figure 4. Relation between ratcheting strain with Mean stress Figure 1. Distribution of longitudinal fillet weld Residual stress on a butt welded pipe Figure 5. Solid model (a) and FE model (b) of welded pipe Figure 2. Distribution of longitudinal fillet weld on a carbon steel welded component Axial residual tress distribution in a buttwelded joint

Funding For Construction Projects Increase With Lower...

One year before Hurricane Katrina, it was reported that 4,663 of the 14,008 worked within the neighborhood. As 2011, 1192 which was about half the population worked in the neighborhood. The majority of the current jobs within the neighborhood are located on the boundary line of St. Claude. Others are employed in nearby neighborhoods such as the upper ninth ward, and bear by parish of St. Bernard. These jobs are mostly minimum wage with 27.9% of the 2011 population earning less than $1250 a month which is a decrease from the 42% of the 2004 population. 50.6% earn up to $3,333 and 68.7% above the poverty line as of 2012 (Lower Ninth Ward Statistical Area). There are a few active signs of the building of new business. The 31.3% poverty of the population shows evidences that there is still a need for services, employment, and resources for this community. Research shows that since Mitch Landrieu took office in 2010, funding for construction projects increase with Lower Ninth Ward first on its list. The funding was as follows: $60 million for street repairs, $50 million for rebuilding schools and $14.5 million for a new community center. As of 2012 there was little sign of new construction for this neighborhood (Parker, 2012). However, there is evidence that more families are returning, moving in, and people are taking pride in the community. This is evident in the increase of Community Gardens, small number of bilged homes removal, rebuilding of family homes, and a small numberShow MoreRelatedQuebec Bridge Collapse2727 Words   |  11 Pagesby 30 meters of any bridge built to date. The Quebex Bridge design was based on a cantilever bridge which was consider by engineers to suitable for the environmental conditions over the St. Lawrence River. 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