A comparative study on constitutive modeling for flow behavior of ultra-supercritical steel at high temperature
A comparative study on constitutive modeling for flow behavior of ultra-supercritical steel at high temperature
复制标题
超超临界钢高温流动行为本构模型对比研究
DOI：
10.1007/s11665-019-04488-z
复制
发表时间：
2019
影响因子：
2.3
通讯作者：
He Jianli
中科院分区：
文献类型：
--
作者：
Chen Fei;Gu Hailun;Zhu Huajia;Ma Wujiang;He Jianli
对改进的Johnson-Cook （JC）模型和应变补偿双曲正弦本构模型预测FB2超超临界钢流动特性的能力进行了对比研究。为了评估这些本构模型的材料常数，在应变速率为0.001-0.1 s−1的1173 ~ 1473 K范围内进行了一系列热压缩试验。采用平均绝对相对误差和相关系数评价适宜性。计算并比较了峰值应力和峰值应变。新修正的JC模型在整个测试温度和应变速率范围内都能较好地预测流变应力。应变补偿双曲正弦本构模型具有较好的峰值应力和峰值应变计算精度。修正后的JC模型只能有效预测峰值应力。改进的JC模型可以预测加工硬化和软化阶段的流动行为，与应变补偿本构模型相比，该模型只需要很少的材料常数，计算时间也减少了。
A comparative study has been carried out on the capability of the modified Johnson–Cook (JC) models and a strain-compensated hyperbolic sine constitutive model to predict the flow behavior for FB2 ultra-supercritical steel. To evaluate the material constants of these constitutive models, a series of hot compression tests were performed from 1173 to 1473 K at strain rates of 0.001-0.1 s−1. The average absolute relative error and correlation coefficient were used to evaluate the suitability. The peak stress and peak strain were calculated and compared. The newly modified JC model predicted the flow stress better over the entire range of the test temperatures and strain rates. The strain-compensated hyperbolic sine constitutive model has a better accuracy to calculate the peak stress and peak strain. However, the modified JC model can only effectively predict the peak stress. The modified JC model can predict the flow behavior in the work-hardening and -softening stages, and it requires a few material constants and a reduced computational time to evaluate these constants compared with the strain-compensated constitutive models.