Rheological behaviours and constitutive models for titanium alloy TA31 at room temperature and high strain rate
At room temperature,quasi-static compression and dynamic impact tests were conducted on titanium alloy TA31 by using UTM5305 universal testing machine and ALT1000 split Hopkinson pres-sure bar device.Based on the stress-strain curves attained from experiments,the strain hardening effect,strain rate strengthening effect,and adiabatic temperature rise softening effect were discussed.Based on the flow stress response characteristics of titanium alloy TA31,a new J-C constitutive model was estab-lished,which considers the coupling effect between strain and strain rate,as well as the influence of adiabatic temperature rise on its flow stress.The calculated values of the constitutive model were com-pared with the experimental values,and the prediction accuracy of the established constitutive model was evaluated by using two statistical parameters:correlation coefficient(R)and average relative error(AARE).The R and AARE of the model are 0.988 7 and 0.63％,respectively.The results show that the new established J-C constitutive model can accurately describe the flow stress response behavior of ti-tanium alloy TA31.
titanium alloyTA31flow stresscoupling effectadiabatic temperature riseconstitutive model
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