文献类型：期刊文献

英文题名：Evaluation of fracture toughness by notched small punch tests with Weibull stress method

作者：Xu, Yifei[1];Guan, Kaishu[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Minist Educ, Key Lab Safety Sci Pressurized Syst, Shanghai 200237, Peoples R China

年份：2013

卷号：51

起止页码：605

外文期刊名：MATERIALS & DESIGN

收录：;EI(收录号：20132216381087);WOS:【SCI-EXPANDED(收录号:WOS:000321696900076)】；

基金：Authors gratefully acknowledge the financial support provided by National Nature Science Foundation of China (Grant No. 51075148). And provided by the State Bureau of Quality and Technical Supervision of China-201110029.

语种：英文

外文关键词：Small punch test; Single edge notch bending test; Fracture toughness; Weibull stress

摘要：The fracture toughness obtained by pre-notched (pre-cracked) small punch specimens is much higher than that obtained by conventional single edge notch bending (SENB) or by compact tension specimens. In this paper, an equivalent Weibull stress method has been introduced. The tests with 0.4 T SENB specimens and linear notched small punch specimens were carried out at 77 K. At this temperature (on lower shelf), the results of both test methods show scatter but not significant. The loads at fracture of both types of specimen were used to determine the Weibull stress parameter, m, and the Weibull stress, sigma(w), with finite element method. Base on the assumption that Weibull stress parameters are material constants, the m which could meet a condition that sigma(0.4TSENB)(w) = sigma(LNSP)(w) was regarded as Weibull stress parameter, m. The critical J integral of 1 T SENB J(c)(ITSENB) at 77 K has been estimated with m and sigma(w) deduced by 0.4 T SENB and LNSP specimens. (c) 2013 Elsevier Ltd. All rights reserved.