Compression Test on Magnesium Alloy MgAl8Zn at High Strain Rates and Temperatures

Summary

Under quasi-static loading strain hardening causes an increase of force and acts stabilising on the deformation process. In case of dynamic loading, the deformation process is characterised by the propagation of mechanical waves and their reflections [1]. Furthermore, additional influences on the ductility of the material have to be taken into consideration. With increasing deformation rate, the strain rate sensitivity increases leading to a higher local value of flow stress and stabilises the deformation. On the other hand, the adiabatic character of the deformation process reduces the flow stress and promotes instability. Mass inertia in the lateral direction arise in connection with radial acceleration. This causes the initiation of either lateral tensile or lateral compressive stresses depending on the time function of the global strain of the specimen [2].