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 need assignment on monday. is it possible?

what is the input to a process control system?

Question: (a) What are the criteria that a frequency planner and a network engineer need to consider during cellular planning and design. (b) Assuming that you work as a c

Q 1.what is the difference between BJT and FET.What is Biasing?Discuss abt diffrent Biasing techniques?Write the advantages and Volatage divider biasing over other biasing?what is

Question: (a) Explain the three types of cyclic repetition blocks in DAB or DVB broadcasting. (b) DAB and DVB use stream and packet modes whereas MBMS uses broadcast and mu

what type of projects are take place in the chemical engineering

Feathering the propeller: If there is an engine failure in flight, the propeller would windmill creating drag and increasing any damage that had occurred in the engine. Feathe

The effect of swell factors on volumes

Adders & Subtractors Adder and Subtractor circuits are used to perform basic calculations in computer systems. Adders, as their name suggests, add binary digits. Since binary