文献类型：期刊文献

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] Key Laboratory of Pressure Systems and Safety [MOE], School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] China Special Equipment Inspection and Research Institute, Beijing, 100029, China; [3] Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, United Kingdom

年份：2016

卷号：139-140

起止页码：194

外文期刊名：International Journal of Pressure Vessels and Piping

收录：EI(收录号：20161002072279)

语种：英文

外文关键词：Bending tests - Creep

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. ? 2016 Elsevier Ltd.