文献类型：期刊文献

英文题名：A modified Weibull stress model to predict cleavage fracture of small punch test specimens

作者：Xia, Zilong[1];Zhong, Jiru[1,2];He, Xinfu[3];Guan, Kaishu[1];Yu, Bintao[3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Shanghai Inst Aircraft Mech & Control, Shanghai 200092, Peoples R China;[3]China Inst Atom Energy, Beijing 102413, Peoples R China

年份：2025

卷号：316

外文期刊名：ENGINEERING FRACTURE MECHANICS

收录：;EI(收录号：20250617839387);WOS:【SCI-EXPANDED(收录号:WOS:001425756600001)】；

基金：This project is funded by the National MCF Energy R & D Program of China (2022YFE03120000) , the National Natural Science Foundation of China (52105146, 52130511 and 52205173) and Shanghai Gaofeng Project for University Academic Program Development.

语种：英文

外文关键词：Cleavage fracture; Small punch test; Weibull stress model; Plastic strain; Stress triaxiality

摘要：The small punch test (SPT) has advantages in obtaining mechanical properties of metallic materials in the International Fusion Materials Irradiation Facility. However, the significant difference in stress states between conventional specimens and SPT specimens brings challenges for SPT to estimate cleavage fracture toughness of materials. The present work proposed a modified Weibull stress model to predict the cleavage fracture of SPT specimens. In this model, the mutual effects of plastic strain and stress triaxiality on the nucleation and instability of micro defects were considered, and a concept of double threshold criteria was also proposed to redefine the fracture process zone considering the large-scale yield and low constraints of small specimens. The model successfully predicted the cumulative failure probability of cleavage fracture for notched SPT specimens at-160 degrees C and-170 degrees C, demonstrating the dependence of the cleavage fracture driving force on plastic strain and stress triaxiality. This study provides a fundamental study for using SPT to predict the cleavage fracture behavior of ferritic steels.