Young Modulus Graph
Linear region - extension inversely proportional to force (stress), point at which this behaviour stops is called proportionality limit
Proportionality limit - stress is no longer proportional to strain after this point
Elastic limit - at this point, material stops behaving elastically and begins to behave plastically, stress is removed and material does not return to original length
Yield point - point the material shows large increase in strain for a small increase in stress - plastic deformation begins
Plastic region - extension increases rapidly for small increase on force in this region
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