所属单位：冶金工程学院

发表刊物：Journal of Materials Engineering and Performance (SCI)

关键字：中文关键字：本构方程，流动应力，修正JC模型；Ti-6Al-4V合金，英文关键字：constitutive equation; flow stress; modified Johns

摘要：A modified Johnson-Cook constitutive equation of Ti-6Al-4V alloy is proposed based on hot compression tests performed in the temperature range of 1073-1323 K and strain rate 0.001-1 s21. The experimental stress-strain data were employed to develop the modified Johnson-Cook constitutive equation of different phase regimes (a + b and b phase). The predicted flow stresses using the developed equation were compared with experimental data. Correlation coefficient (R) and average absolute relative error (AARE) were introduced to verify the validity of the constitutive equation. The values of R and AARE for a + b phase were 0.990 and 7.81%, respectively. And in b phase region, the values of R and AARE were 0.985 and 10.36%, respectively. Meanwhile, the accuracy, the number of material constants involved, and the computational time required of the constitutive equation were evaluated by comparing with a strain-compensated Arrhenius-type constitutive equation. The results indicate that accuracy of modified Johnson- Cook constitutive equation is higher than that of compensated Arrhenius-type model at a + b phase, while lower at single b phase region. Meanwhile, the time required for evaluating the material constants of modified Johnson-Cook constitutive equation is much shorter than that of the strain-compensated Arrhenius type ones.

备注：蔡军

合写作者：翟鹏,李付国

第一作者：杨洁,王快社,蔡军

论文类型：期刊论文

卷号：卷：24

期号：期：1

页面范围：页：32-44

是否译文：否

发表时间：2015-01-01