What is the difference between elastic and plastic deformation? What assumption is made when...

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What is the difference between elastic and plastic deformation? What assumption is made when structures and their components are analysed using the principles of statics?

Robert · Accepted Answer

What is the difference between elastic and plastic deformation? What assumption is 
made when structures and their components are analysed using the principles of 
statics? 
Answer. 
The basic difference between elastic and plastic deformation is that the elastic 
deformation is recoverable but plastic deformation is not. 
When a material is stretch through some kind of external force (stress is applied) then 
the material is extended/expanded in the direction of applied stress and contracted in 
direction perpendicular to applied stress. Now if external force is removed/released, 
then material regain to its initial shape i.e. initial dimension. If so, then we can say 
material deforms elastically and the process is called elastic deformation. Deformation 
is in the sense, initially after the application of load,

What is the difference between elastic and plastic deformation? What assumption is made when structures and their components are analysed using the principles of statics?

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