文献类型：期刊文献

英文题名：Influence of constitutive equation and friction on measurement of creep strain rate based on small specimen testing technique

作者：Tan, Jianping[1];Chang, Shuai[1];Zhang, Kun[1];Li, Sikuan[1];Chen, Shijian[2];Fu, Jia[2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, MOE Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[2]CNNC, SUFA Technol Ind Co Ltd, Suzhou, Peoples R China

年份：2024

卷号：47

期号：4

起止页码：1345

外文期刊名：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

收录：;EI(收录号：20240515449841);WOS:【SCI-EXPANDED(收录号:WOS:001149796600001)】；

基金：This work is financially supported by the Projects of the National Natural Science Foundation of China (52130511, 52075174, 11502082).

语种：英文

外文关键词：creep strain rate; finite element; friction; measurement error; small specimen; stress regime-dependent creep

摘要：Two stress regime-dependent creep constitutive equations, that is, two-regime Norton (2RN) model and Sin-hyperbolic (Sinh) model, are adopted to numerically investigate the influence of constitutive equation and friction on the measurement of steady-state creep strain rate based on five types small specimens. Results show that the influence of constitutive equation and friction depends strongly on the type of small specimen. A measurement error of more than 19 times may occur if the 2RN model is used, while the use of the Sinh model is able to generate a consistently lower measurement error. Of all small specimens, the cantilever beam testing (CaBT) is revealed to exhibit the best comprehensive performance in terms of measurement error and response to friction. To validate numerical findings, creep tests on the CaBT specimen of P91 steel are conducted at 600 degrees C. Finally, recommendations on the choice of small specimen for obtaining creep strain rate are made. Sinh model is better in describing stress regime-dependent creep behavior.Influence of friction is strongly dependent on the type of small specimen.Small cantilever beam testing has the best comprehensive performance.Attention should be paid to selecting the constitutive equation and specimen type.