Question

Explain the terms elastic limit, yield point, breaking point and permanent set from stress – strain curve.​

Answer 1

Elastic limit, maximum stress or force per unit area within a solid material that can arise before the onset of permanent deformation. ... When stresses up to the elastic limit are removed, the material resumes its original size and shape. Stresses beyond the elastic limit cause a material to yield or flow.

the yield point is the point on a stress-strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior. Below the yield point, a material will deform elastically and will return to its original shape when the applied stress is removed.