【摘要】 采用试验方法,通过准静态压缩试验和分离式Hopkinson压杆试验,获得不同应变率10-3s-1～103s-1和不同温度293K～873K范围内TA1的应力-应变曲线;基于Johnson-Cook模型对试验结果进行分析,并对其应变率强化项做出修正。结果表明,TA1为应变率敏感材料,流动应力随应变率增加而增加,随温度增加而减小;未经修正的Johnson-Cook本构模型与试验数据偏差较大,修正后的本构模型与试验值吻合较好。更多还原

【Abstract】 The stress-strain curves of TA1 under different strain rate ranges(10-3s-1~103s-1) and different temperature ranges(293K~873K) were obtained through the quasi-static compression test and split Hopkinson pressure bar test.The parameters of Johnson-Cook model were determined and the strain rate hardening term was modified.The results showed that TA1 was a kind of strain-rate sensitive materials.The flow stress increased with the increase of strain rate,while decreased with the increase of temperature.The un-amended Johnson-Cook constitutive relation had a large deviation from the test data.The modified constitutive relation had a good agreement with experimental results.更多还原