A constitutive model of Al/50 wt%Sip composites considering particle damage effects

In this research, the stress-strain behavior of Al/50 wt%Sip composites was investigated in the temperature range of 20–300 °C and strain rate of 2800–6300/s. The effect of temperature and strain rate on the mechanical properties of the composites and the damage probability of the Si particles were analyzed. The results show that the probability of particle damage increases with increasing strain rate and decreasing loading temperature, which weakens the strength of composites and leads to nonlinear softening characteristics of the flow stress. Based on the Eshelby equivalent inclusion model and the Weibull model, a dynamic damage softening constitutive model of the Al/50 wt%Sip composites was developed. Then, the dynamic constitutive model was validated by experiments. The validation results showed that the constitutive model could accurately predict the dynamic compression behavior of nonlinear softening of the Al/50 wt%Sip composites.