Estimation of C including the effect of threshold stress
Estimation of C including the effect of threshold stress
复制标题
C 的估计，包括阈值应力的影响
DOI：
10.1016/j.engfracmech.2017.12.032
复制
发表时间：
2018
影响因子：
5.4
通讯作者：
Guo Jin Quan
中科院分区：
文献类型：
--
作者：
Lai Huan Sheng;Xu Shu Feng;Liu Kang Lin;Bai Chunmei;Gong Ling Zhu;Guo Jin Quan
In some alloys such as 9%Cr heat resistant steels and magnesium alloys, the creep constitutive equation of the power-law requires a term of threshold stress due to the presence of second phase particles. It is necessary to establish an estimation method ofC∗for such alloys to predict the life of their components. In this paper, the General Electric/Electric Power Research Institute (GE/EPRI) method and the reference stress method were modified to estimateC∗for power-law creep materials with threshold stress. The finite element method was used to verify the accuracy of the modified methods. The accuracy of the calculation equation ofC∗in the American Society for Testing Materials (ASTM) E 1457 was also assessed. The results indicated that the modified GE/EPRI method was sufficiently exact as an engineering method.h1was slightly affected by the applied load and significantly affected by the threshold stress. The accuracy of the modified reference stress method increased with increased applied load and was within ±40%. The accuracy of the calculation equation ofC∗in ASTM E 1457 was not affected by the threshold stress and the equation could be directly used for power-law creep materials with threshold stress.
