文献类型：会议论文

英文题名：Effect of large deformation on creep property evaluation by small specimen bending tests

作者：Tu, Shan-Tung[1,3];Zhuang, Fa-Kun[1,2];Zhou, Guo-Yan[1];Sun, Wei[3]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China;[2]China Special Equipment Inspect & Res Inst, Beijing 100029, Peoples R China;[3]Univ Nottingham, Fac Engn, Nottingham NG7 2RD, England

会议论文集：14th International Conference on Pressure Vessel Technology (ICPVT)

会议日期：SEP 23-26, 2015

会议地点：Chinese Pressure Vessel Inst, Shanghai, PEOPLES R CHINA

主办单位：Chinese Pressure Vessel Inst

语种：英文

外文关键词：Creep bending tests; Small specimen; Large deformation; Critical load; Finite element method

摘要：For small-specimen bending creep tests, large deformation occurs inevitably when the specimen under a large load or a long creep time. In such a circumstance, the conventional method for creep property evaluation, which is based on the small deformation assumption, may fail to attain a sufficiently high accuracy. Three typical specimens including circular ring, three-point bending and cantilever-beam specimens, are therefore examined. Based on the limit load approach, a critical load method is proposed to control the large deformation effect. Analytical solutions of the critical loads of the specimens are derived. Finite element method is used to quantitatively assess the effect of large deformation. The results show that the predicted creep curves of all the three specimens are significantly affected by the large deformation. Creep properties can only be accurately regressed when the applied load is below the critical load. The critical loads calculated by finite element method agree well with the analytical solutions. Furthermore, the analytical solutions are validated by the experimental results. The effect of creep time on the critical load has also been discussed. (C) 2016 Elsevier Ltd. All rights reserved.