Estimation of Fracture Toughness for A508-III Steel in Ductile-to-Brittle Transition Region Using a Strain-Energy–Density-Based Fracture Failure Model  

作　　者：Yuanjun Wu Chen Bao Lixun Cai Kaiqing Wang Xiao Liu 

机构地区：[1]Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu,610031,China [2]Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu,610213,China

出　　处：《Acta Mechanica Solida Sinica》2022年第5期834-841,共8页固体力学学报（英文版）

基　　金：This work is financially supported by the National Natural Science Foundation of China(Grant Nos.11872320 and 12072294);the fund of Science and Technology on Reactor Fuel and Materials Laboratory.

摘　　要：According to the assumption of intrinsic relationship between ultimate strain energy density and microcrack nucleation,this work developed a fracture failure model to estimate the fracture toughness of A508-III steel in the ductile-to-brittle transition region.The fracture toughness and uniaxial tension tests at different temperatures were carried out to determine the relationship between nucleation parameter and ultimate strain energy density,from which the evolutions of fracture toughness of A508-III ferritic steel for different cumulative failure probabilities at different temperatures were predicted.The fracture failure model can well describe the fracture toughness distribution of A508-III steel in the ductile-to-brittle transition region.Compared with the master curve method,this model has better temperature adaptability.It is more convenient to calibrate the parameters of this model compared with the traditional Beremin model,and without complex finite element analysis.

关 键 词：Fracture toughness Cumulative failure probability A508-III steel Ductile-to-brittle transition region 

分 类 号：TB306[一般工业技术—材料科学与工程]