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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
Strain = A change in shape or volume in response to a stress. Stress is the cause, strain is the effect! There are three types of stress: 1) Compressive stress  Forces that squeeze or push toward one another from opposite directions (cause shortening or flattening). 2) Tensional stress  Forces that pull away from one another in opposite directions (cause stretching or extension). 3) Shear stress  Forces that are offset from one another and operate in opposite directions (cause a shear strain). The behavior of rock during stress depends on: 1) The type of rock. 2) The type and amount of stress.