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Combustion, Explosion and Shock Waves

2015 year, number 6

Yield Stresses in a Ductile Metal at a High Strain Rate in Different Stress States

S.-W. Zhang, C.-L. Liu, G.-W. Ren, Q.-Z. Li
Institute of Fluid Physics, CAEP, P.O.BOX 919-101, fsp Mianyang, Sichuan, P. R. China
zhangswxueshu@163.com
Keywords: предел текучести, упругий предвестник, высокая скорость деформирования, yield stress, elastic precursor, high strain rate

Abstract

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.