Yield stresses in a ductile metal at a high strain rate in different stress states

The amplitudes of the elastic precursor in LY12 Al-based alloy samples under different pre-stress states are obtained. Even though the material does not undergo a brittle-to-ductile transition, the amplitude of the elastic precursor still increases with pre-compression. It is demonstrated that the amplitude of the elastic precursor is not only related to the yield stress, but also to the stress state. A method for obtaining a more accurate yield stress of materials under both uniaxial strain and uniaxial stress conditions is presented.