Elastic and plastic deformation, Other Engineering

Q. Define elastic and plastic deformation and differentiate between them.

Ans. Elastic deformation : Elastic deformation is that part of the deformed material, when the applied load is removed, would spring back to its normal space. The elastic deformation takes place of low stresses and having following characteristics.

          (i) Reversible                    (ii) Usually very small

       (iii) Obeys the hook's low i.e. stress is professional to strain.

       An elastic effect is due to : ? Grain boundary effect  ? Motion of dislocations ? Thermo elastic effects  ? Atomic diffusion 

? Magneto elastic effect

       The damping capacity of materials is also another aspects of an elastic behaviour.

       Plastic Deformation : In the plastic deformation, the material will not obeys the hook's low. This deformation is set generally 40% melting temperature of that material and depends on applied load, rate of strain, temperature etc. During the plastic deformation the metal follows the following relation i.e.

                              P = ken

             Where      P = stresses; K = strength coefficient

                              e = strain; n = power factor

      Mechanism of plastic deformation : When the crystal is subjected to sufficiently large force, plastic deformation takes place i.e. atoms moves permanently. This movement of atoms is not haphazard but the movement occurs in definite direction in the lattice. Plastic deformation takes place due to mainly : (i) Slip         (iv) Twining

Difference between elastic and plastic deformation :

     Elastic deformation                          plastic deformation

1. It is first stage of deformation.          It is second stage of deformation

                                                             I.e. after the elastic deformation.

2.  It disappears after the                      it does not disappear even the

     Removal of load.                              Load is removed.

3.  It is temporary.                                It is permanent.

4.  It is reversible.                                 It is irreversible.

5.  Stress-strain relationship is            In plastic deformation there is

     Given by a constant.                       No such well defined constant.

6.  After this next stage is plastic         After this next stage is fracture.

     Deformation.

7.  Elastic deformation is practically     Plastic deformation is high and

     Small and produced strain in          the strain produced is also quite

     The order of 0.5% only.                  high.

Posted Date: 8/3/2012 5:27:25 AM | Location : United States







Related Discussions:- Elastic and plastic deformation, Assignment Help, Ask Question on Elastic and plastic deformation, Get Answer, Expert's Help, Elastic and plastic deformation Discussions

Write discussion on Elastic and plastic deformation
Your posts are moderated
Related Questions
I am preparing for a seminar ... but I am searching for a very good topic. Can you help me to get a topic in wireless communication . i want to know what are the latest technologie

Convert the analog filter the system function Ha(s)=(s+0.1)/((s+0.1)(s+0.1)+16) with digital iir filter by bilinear transformation .the digital filter is to have the resonent freq

write an algorithm to find a number that multiplies your name 10 times

Light-emitting diode: One of the most common light sources used in electronics is the "Light Emitting Diode" (LED).  A LED is a two terminal semiconductor device comprising a p

One approach of an intersection with fixed time traffic signals, vehicles arrive at 500 veh/h on the approach. The cycle time of the intersection is 80 seconds, and the effective g

We recall the "typical section" aerofoil model with oscillating pitching and plunging motions to represent the torsional and bending behaviour of a wing structure with large aspect

application of schmitt trigger

Can you describe an example of a conceptual model?

What is Tact? Tact is nothing but a situational score energy. Once I had gone to a Govt workplace for getting documentation. There I was informed to provide unwanted fee more th

a rectangular beam of size 40mm*60mm is subjected to bending. the maximum bending stress is limited to 75N/mm^2. find the moment of resistance of beam section.