论文部分内容阅读
为了研究Ti-6Al-4V合金在高速切削下的真实流动应力-应变关系,针对当温度达到临界变化温度时,材料的流动应力会突然下降这一现象,建立了一种修正Johnson-Cook(J-C)本构方程。修正的J-C本构关系能够准确地描述加工温度范围内再结晶软化机制对材料流动应力的影响,预测结果与试验数据吻合良好,特别是在高温阶段,流动应力计算值与试验值误差在4%以内,正确地反映了Ti-6Al-4V合金各个温度下的真实流动应力变化。结果表明,修正后的J-C本构方程可以用于研究分析Ti-6Al-4V合金的流动应力特征与规律。
In order to study the real flow stress-strain relationship of Ti-6Al-4V alloy under high-speed cutting, aiming at the sudden drop of material flow stress when the temperature reaches the critical temperature, a modified Johnson-Cook )Constitutive equation. The modified JC constitutive relation can accurately describe the influence of recrystallization softening mechanism on the flow stress of the material within the processing temperature range. The predicted result is in good agreement with the experimental data. Especially at the high temperature stage, the calculated error of the flow stress is within 4% , Correctly reflects the real flow stress change of Ti-6Al-4V alloy at each temperature. The results show that the modified J-C constitutive equation can be used to study the characteristics and laws of flow stress of Ti-6Al-4V alloy.