what is the effect of heat treatment on stress strain curve ( of metal, ceramics, polymer)?
85904
The response of polymers differs from one to another and beyond doubt it is vary complicated. Fortunately there are some references modeling this behavior. If you want more on this send me your questions at david_blear@yahoo.com
302467
The highest "concentration" of stress will occur at "stress risers."  For example if a shaft is divided along its length with two different diameters, each half will flex depending on its diameter but at the transition there may be a sudden change in stress causing the local stress (in psi - pounds per square inch) to rise well above the average stress of either half on a microscopic basis.  This is where cracks may first form under heavyload.  A very sharp "corner" (small radius) at the change in diameter will increase stress concentration while a large rounded corner will lessen stress concentration (and stress!).  A coone-shhaped transition may be even better.  Any reduction in uniformity of the shaft cross-section (perhaps a key slot) will form a stress riser perhaps requiring the entire shaft to be larger and stronger to compensate for the key-way design.  The yoke you mention would constitute a nonuniformity and could create stress risers and stress concentration.  This is a factor to be considered in good design since it can not be eliminated but only recognized and minimized.  Curved parts are often better than parts with sharp corners or tight bends.  That is why service life tests of components and failure analysis leads to improved designs.  A better design may require a different steel alloy or larger radii when machining or grinding parts or even de-rating allowable loads.  Hope that helps a little.
727214
http://en.wikipedia.org/wiki/Strain_%28materials_science%29\nhttp://en.wikipedia.org/wiki/Specific_gravity\nhttp://en.wikipedia.org/wiki/Stress_%28physics%29\nhttp://en.wikipedia.org/wiki/Reynold%27s_number
345166
Friction, Heat, Acid.
862263
Cold rolling applies stress to the sheet or bar metal in the form of compression.
1134140
Depends on the thermoconductive properties of a certain material. Copper for example will heat up or cool down very fast.
1070119
i think you can get a lot of this info rmation to clerar your doubts\n\nhttp://www.calce.umd.edu/general/Facilities/Hardness_ad_.htm
392086
If dislocation is observed in the Crystal Structure, there will be a stress concentration around the dislocation or the crystal will behave in a exited manner. Thus when stress is applied on the dislocated plane, stress required for causing slip is less.
253593
The type of plastic selected has a great influence on the performance of the plated plastic part. ABS plastics are the base materials in most cases.\n\nCheck out the following:
281995
Is it elasticity? Try to solve the problem with some formula below:\nYoung's Modulus(Y)=Stress/Strain\n=(F/A)/(dl/L) \nwhere, F=force applied, \nA=cross sectional area, \ndl=leangth increase and L=total lenght.\nBulk Modulus(B)\n=dP/(dV/V) \nwhere P=pressure and V=volume.
1087933
FEM employs the power of the computer to rapidly apply the principles of structural deformation and 3 dimensional stress / strain analysis to every point on models of any geometry in order to predict the affects of forces on the model. These computations would take forever but for the computer. Even with the computer FEM will take hours sometimes to compile, depending upon the density of nodes or points in the model to be analyzed. The virtue is that design can evolve with the tool of FEM. Changes in structure and shape can be finely tuned in a relatively short time. In addition aerodynamic (fluid) analysis is likewise performed when desired such that the effects of wind and speed etc is incorporated into the final design.
376669
They are the stresses normal to a rectangular element of the item being analyzed for stress.  A good explanation can be found here.......\n\n\nhttp://acm.uva.es/p/v104/10429.html
665747
Working Stress Method\n• Material is assumed to behave elastically.\n• The allowable stresses are obtained by dividing the limiting stresses of material by factor of safety.\n• Ignores uncertainties in different types of load.\n• Does not use the full range of strains in the material.\n• Therefore, disregards the nonlinear part of the material\ncurve.\n• Considers failure as a function of stress while it is a\nfunction of strain.\n• Stress as a measure of safety does not give true margin of\nsafety against failure. A stress factor of safety 3 for\nconcrete does not mean that the member will fail at a load\nthree times the working load.\n• The structure must carry loads safely. It is logical to use\nthe method based on load causing failure.\n• The additional load carrying capacity of the structure due\nto redistribution of moment can not be accounted for.\n• Produces conservative designs.\n\n\n\nUltimate Load Method\n• The loads are enhanced by load factor-\n• Design load = LF * service load\n• The method uses total stress-strain curves of the\nmaterial.\n• Strain based failure.\n• LF=3 means the structure has 3 times more\ncapacity\n• Since the method considers the plastic region of\nthe stress-strain curve also, it utilizes the reserve\ncapacity of the member.\n• Uncertainty in load only is considered. Uncertainty\nin material is ignored.
81481
Hard to say without a picture or to see the process. Gas pressure? Wind? Contaminants in the metal? Wrong gas mixture?\nHere's a couple of links that may help..
126299
Yes. You will be work-hardening the rebar at the point of bend. The grain structure begins to refine at that point and becomes increasingly more brittle (less ductile).
1020919
I don't know, but my husband's a mech. Engineer and he says:\nwww.matweb.com\nhas just about every material used and their engineering specs.  Did you check there?
770874
Basically strain may be defined as the change in the original dimension (may be linear, areial, volumetric) to its original dimension\nLogarithmic strain: It may be defined as the equal deformation in the body regarding to the loading on to it.\nPlastic strain: It may be defined as the deformation occured in a body which cannot be restored.\nTrue stress: It is the actual resistance offered by the body due to the actual loading on to it.\nReverse Loading: When the upward pressure is more than that of the downward load then that struture may be subjected to reverse loading