Predicting the strain-hardening behavior in metals

摘要

When a metal is subjected to increasing applied loads below its yield point, the strains are initially often proportional to the stress, and the material returns to its original shape or dimensions when the load is removed, which is an elastic behavior of the metal. Stress - strain values obtained from tensile tests of aluminium and steel is used to evaluate the true stress - true strain values. The Hollomon's model is then used to predict the strain-hardening behavior in the two specimens. It is clearly seen that the strain-hardening behavior in metals can be described using the Hollomon's model. However, we have assumed that the onset of strain-hardening is at the yield point up until the ultimate tensile strength. The correlation between the experimental true stress - true strain values of aluminium and the calculated values using the Hollomon equation is much better than that of steel.