Elastic Region:
The region of the stress-strain curve in which the material returns to the undeformed state when applied forces are removed is called the elastic region.
Plastic Region:
The region in which the material deforms permanently is called the plastic region.
Yield Point:
The point demarcating the elastic from the plastic region is called the yield point. The stress at yield point is called the yield stress.
Plastic Strain:
The permanent strain when stresses are zero is called the plastic strain.
The off-set yield stress is a stress that would produce a plastic strain corresponding to the specified off-set strain.
A material that can undergo large plastic deformation before fracture is called a ductile material.
A material that exhibits little or no plastic deformation at failure is called a brittle material.
Hardness is the resistance to indentation.
The raising of the yield point with increasing strain is called strain hardening.
Necking Phenomenon:
The sudden decrease in the area of cross-section after ultimate stress is called necking.
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