Deformation of metals, Other Engineering

Assignment Help:

Q. Explain the following with reference to deformation of metals:

                        (1) Preferred orientation

                        (2) Elastic after effect

                        (3) Bauschinger effect

Ans. (1) Preferred orientation: It is a condition of polycrystalline aggregate in which crystal orientations are not random under certain conditions the crystal is a metal tend to align themselves in a common axial direction. Such a direction is known as a preferred orientation.

       Preferred orientation occurs when certain crystallographic planes, tend to orient themselves in a preferred manner with respect to the direction of maximum strain.

(2) Elastic after effect: Consider a metal which is subject to sudden constant stress at a level below the elastic limit.

     After an initial instantaneous strain, the metal will gradually creep until the strain reaches an essentially value.

      If the load is removed suddenly, the strain drops instantaneously, but not at all a certain amount of strain still remains that solely decrease with time, approaching its original value. The time dependence of strain is called the elastic after effect.

(3) Bauschinger Effect: If in a metal the flow is started at certain stress intensity in one direction in one slip plane system, and subsequently the sign of the stress is reversed then flow in the reverse direction will initiate at a lower stress level.

       Let a material has the yield stress in tension as 'a' and the same in compression as 'x'. If is a new specimen of the same material is loaded in tension past the limit yield stress to 'b' along the path 'q, a, b' and then it is unloaded it will flow the path 'b, c'.

     If now, the specimen is subjected to reversed stress compressive stress the plastic flow will begin at the stress corresponding to point 'd' which is apparently lower than the original compressive yield stress of the material corresponding to point 'x'.

      Thus, while the yield stress in tension was increased by strain hardening from 'a' to 'b' the yield stress in compression is decreased from 'x' to 'd'. This effect is Bauschinger effect.


Related Discussions:- Deformation of metals

Slipstream effect - propeller, Slipstream Effect. In passing through th...

Slipstream Effect. In passing through the propeller the air is accelerated and given a rotational velocity. The parts of the aircraft that are in the propeller slipstream wi

Naked short selling, are retail investors or traders permitted to naked sho...

are retail investors or traders permitted to naked short a stock? who is permitted to naked short a stock assuming there has been no suspension of this practice and following the f

Numeric computation matlab, Expertsmind.com offers Performing Numeric Comp...

Expertsmind.com offers Performing Numeric Computation matlab assignment help MATLAB contains numbers, precise, and technological innovation features to support all common tech

Diffusion, distingush between short range and long range diffusion

distingush between short range and long range diffusion

Corporate finance, Firm A needs to purchase a new machine. If the machine i...

Firm A needs to purchase a new machine. If the machine is purchased, it will replace an old machine purchased 10 years ago for €105,000 and which is being depreciated on a straight

Pn junction diode, what is the effect of temperature on pn junction diode o...

what is the effect of temperature on pn junction diode of component

How does plane diffraction grating forms a spectrum?, Q.  With necessary t...

Q.  With necessary theory explain the formation of spectrum by a plane transmission grating when composite light falls on it OR How does plane diffraction grating for

Financial leverage Multiplayer , How i can have the FLM if i dont have the ...

How i can have the FLM if i dont have the Total Assets or Shareholders Equity

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd