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通过对Ti-6Al-3Nb-2Zr-1Mo合金820~970℃,0.001~1 s~(-1)条件下的热模拟压缩试验,得到不同变形条件下的高温变形真应力-真应变曲线。基于此实验数据建立了该合金BP-ANN本构预测模型和传统的回归模型。结果表明:2个模型的最大相对误差分别为4.35%和13.9%,平均绝对误差AARE分别为1.42%和6.53%,说明BP-ANN模型具有较优异的预测能力,此模型可作为Ti-6Al-3Nb-2Zr-1Mo钛合金高温变形本构模型。
The true stress-strain curves of Ti-6Al-3Nb-2Zr-1Mo alloy at 820 ~ 970 ℃ and 0.001 ~ 1 s ~ (-1) were obtained. Based on this experimental data, the constitutive BP-ANN prediction model and the traditional regression model were established. The results show that the maximum relative errors of the two models are 4.35% and 13.9%, respectively, and the average absolute errors AARE are 1.42% and 6.53%, respectively. This indicates that the BP-ANN model has better predictive ability. This model can be used as Ti-6Al- Constitutive Model of 3Nb-2Zr-1Mo Titanium Alloy under High Temperature Deformation.