文献类型：期刊文献

英文题名：Effect of microdefects on load-deflection of small punch test by experimental investigation and finite element analysis

作者：Guan, Kai-shu[1];Xu, Tong[2];Zhang, Xiao-cheng[1];Wang, Zhi-wen[1]

机构：[1]E China Univ Sci & Technol, Key Lab Safety Sci Pressurized Syst, Minist Educ, Shanghai 200237, Peoples R China;[2]China Special Equipment Inspect & Res Inst, Beijing 100013, Peoples R China

年份：2013

卷号：110

起止页码：14

外文期刊名：INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING

收录：;EI(收录号：20133916773752);WOS:【SCI-EXPANDED(收录号:WOS:000325595100004)】；

基金：The author wishes to thank the financial support provided by National Nature Science Foundation of China (Grant No. 51075148), the State Bureau of Quality and Technical Supervision of China (201110029) and the National Science & Technology Pillar Program during the twelfth five-year plan period (2011BAK06B03)

语种：英文

外文关键词：Small punch test; Microdefects; Load-displacement curve; Size effect

摘要：The mechanical properties of metals which were subjected to high temperatures or neutron irradiation decrease drastically during a long period of service. The small punch test (SPT) was introduced, by which various material properties could be obtained from a fairly small disk specimen, with an almost non-destructive method, from an in-service pressure vessel. However, due to the relatively thin samples, the microdefects which may have a severe effect on the small punch samples may present little effect on the conventional large sample. In this paper, Q345R and Q235A steels were used to carry out SPT in order to study the effect of microdefects on the mechanical properties. The effects of microdefect on the load displacement curve of SPT were investigated. The result shows that Q235A steel has obvious microdefects and shows scattering in load-displacement curves and rough fracture morphology. The microdefects have an obvious effect on the ultimate strength and have no effect on the yielding strength. The finite element analysis result shows good accordance with the test result. (C) 2013 Elsevier Ltd. All rights reserved.