A DUCTILE FRACTURE CRITERION BASED ON THREEDIMENSIONAL VOID MODEL

作     者：J.K. Huang X.H. Dong 

作者机构：National Die ＆ Mould CAD Engineering Research Center Shanghai Jiaotong University Shanghai 200030China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2008年第21卷第3期

页      面：227-234页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This study was financially supported by the National Natural Science Foundation of China (No.50575143) the Research Fund for the Doctoral Program of Higher Education (No. 20040248005) 

主　　题：Fracture criterion Uniaxial tension Velocity discontinuity Mechanical and metallographic analyses 

摘      要：A fracture criterion derived from a microscopic point of view is proposed and has proved to be effective in the analysis of uniaxial tension. On the one hand, a method of predicting a ductile fracture is proposed using a three-dimensional void model and the assumption of velocity discontinuity. The relationship between the void volume fraction and the critical strain to fracture, calculated with the help of the new model, shows the same tendency as that obtained from the modified Thomason model. On the other hand, the mechanical and metallographic analyses of the uniaxial tension experiment are performed using four kinds of carbon steel. The relationship between the void volume fraction and the critical strain to fracture, calculated from the new model, agrees better with the result obtained from the experiment, rather than that calculated by the modified Thomason model, which confirms the validity of the ductile fracture criterion based on the three-dimensional void model.