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the gradient of the straight part of the line is known as the strain hardening coefficient or work hardening coefficient and is closely related to the shear modulus about proportional therefore a metal with a high shear modulus will have a high strain or work hardening coefficient for example molybdenum grain size will also influence strain hardening a material with small grain size will strain harden more rapidly than the same material with a larger grain size
Definitions of stress and strain. Nominal stress: the force on the object divided by the original area. True stress: the force on the object divided by the actual area. E.g., when necking occurs the true stress is the force applied divided by the area of the neck. The unit for stress is Nm-2, or Pa. Nominal strain: change in dimension / original dimension. This is also known as the engineering strain, and is strictly only true for very small displacements.