In addition to the tensile testing measurements, the hardness of the sample should be measured before and after the deformation using the Rockwell hardness tester. Determine the change in sample hardness in the gauge length produced by the plastic deformation. Also, measure the hardness in the region held by the grips during the deformation. Determine how the work-hardening (strain hardening) depends upon location in the sample.

Work hardening is an important parameter in manufacturing processes and thermal treatment of a material is often required during the fabrication of a component when work hardening decreases its ductility. Thermal annealing can remove the effects of work hardening and return the material to its original ductility.