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On a stress strain curve the elastic limit is the point where the straight portion curve first starts to curve. When load is removed strain will return to zero. The yield point is a point on the curve just beyond the elastic limit. When load is removed strain will not return to zero. It will return approximately as a straight line parallel to the original, and have an offset strain value. The yield point offset is arbitrary but usually defined as 0.2% (.002 permanent strain) as most common strain devices can measure that amount.
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What material is more brittle wood cast iron steel or glass?
Cast iron is very brittle in its basic form, with yield point very close to fracture point. However, glass is the most brittle, having no yield point - it is perfectly elastic before failure
How do you find modulus of elasticity from load-displacement curve?
The modulus of elasticity is a property specific to a given material and in practice is derived through laboratory testing. The modulus of elasticity is defined as stress/strain. One would have to apply a force uniformly over a known cross section of a material and monitor the strain utilising strain gauges. When the results are plotted you will notice that you get elastic behaviour up to a point of yield (this is known as the yield stress in normal carbon steels, however in stainless steel where the yield point is not as defined, we normally accept it to be the 0.2% strain) and the material should behave linearly in this area. If you take the gradient of the stress/strain, this will be your Elastic modulus. Please note that the plotted curve will begin to flatten off roughly at the 0.2% strain line and this is due to the fact that the material has yielded. even after this point the material will not fail but will act 'plastically' up to a point where the material fractures which we call the ultimate stress.
A test specimen is stressed beyond the yield point and is then unloaded its yield point will be?
increased...because the specimen is strain hardened due to plastic deformation.
Why the yield point occur in the stress-strain graph of mild steel?
Once material is stressed. dislocations present in it starts to move and gather near grain boundary. These dislocation are repulsive in nature and resist further movement, hence yield point occurs. Once dislocations crosses the grain boundary, there is very less amount of force required to keep them moving, hence yield point phenomenon appears i.e. less amount of force is required.
What is mean by yield strength of steel?
The steel has a ductile material properties so that it could be elongate at a point of ultimate yield point.It is stable while before the break point
Hooke's law does not hold beyond?
it does not hold beyond the elastic limit or yield point or when a material becomes non linear
Can i have a list of elastic limits of some objects?
The Wikipedia lists the elastic limit for some materials, in the article "Yield (engineering)".
What is the difference the proportional limit and the yield point of a spring that has been over stretched?
differece between proportional limit and yield point of a spring?
What is plasticity in chemistry?
Plasticity is the characteristic of a metal where it undergoes inelastic strains beyond the elastic limit.Until the elastic limit point, the strain that a metal undergoes is elastic, meaning the metal will regain its original dimensions upon unloading. For example, during a tensile test, a metal pulled in tension to a strain below its elastic limit will return to its original dimensions upon release.However, if a metal is strained beyond the elastic limit into the plastic region, the strain will be inelastic, meaning the metal will be unable to return to its original dimensions upon unloading. Large deformations in ductile materials result in plastic flow.Metals experience periods of both elastic and plastic deformation. On a stress-strain curve, the elastic region is followed by the plastic region. Oftentimes, the elastic limit is approximated as equal to the proportional limit and (for mild steel) the yield stress.
Why a stress-strain curve usually has two segments.?
Elastic - Plastic Deformation Ranges. Before and after yield point.
What material is more brittle wood cast iron steel or glass?
Cast iron is very brittle in its basic form, with yield point very close to fracture point. However, glass is the most brittle, having no yield point - it is perfectly elastic before failure
What happens during elastic deformation for drugs?
Elastic deformation occurs when an opposing force is applied to the drug after particle rearrangement (i.e. the initial repacking of the particles). If the force is released before the yield point is reached, the particles of the drug will return to their original shape. However, if the force goes beyond the yield point, the powder will undergo plastic deformation or brittle fracture.
What is difference between the proportional limit and the yield point of a string that has been over stretched?
proportional limit is value of stress that beyond which it is nonlinear; prior to that the stress strain diagram is a straight line. At yield, the material strain will not return to zero after unloading and have a permanent set
Why the mild steel have two yield points?
Low carbon steels suffer from yield-point runout where the material has two yield points. The first yield point (or upper yield point) is higher than the second and the yield drops dramatically after the upper yield point. If a low carbon steel is only stressed to some point between the upper and lower yield point then the surface may develop Lüder bands.
What is the difference of rupture point and yield point?
katree
Would the firm ever operate on the elastic portion of the demand curve if MC equals 0?
Yes; indeed, a monopolist ALWAYS operates on the elastic portion.Here's a simple reason why: if demand were inelastic, raising price would yield more revenue, which would yield more profit.
What is the endurance limit for cold roled steel?
0.5 of the yield strength.
