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: 358-362. [12] JAIN M, ALLIN J, LLOYD D J. Fracture limit prediction using ductile fracture criteria for forming of an automotive aluminum sheet [J]. International Journal of Mechanical Sciences, 1999... in non-isothermal viscous pressure bulging of aluminum alloy sheet using ductile fracture criterion WANG Zhong-jin(王忠金), LIU Jian-guang(刘建光), LI Yi(李毅) School of Materials Science and Engineering......
computation 3.1 Cockcroft-Latham’s DFC In order to design an optimum plastic forming process without failure, a ductile fracture criterion is highly important and necessary. Numerous criteria have been... of varying ductile fracture criterion (VDFC) In order to evaluate the ductile fracture criteria, the fracture occurrence and the damage value at fracture time are necessary to be made certain. Based......
stage of the process. In the past, many fracture criteria have been developed to predict the initiation of ductile fracture. They can be broadly classified as empirical and semi- empirical... criteria[7]. Other researchers, such as MCCLINTOCK[8] and OYANE et al[9], examined the ductile fracture through void growth phenomenon and proposed correlative failure criteria. The criteria......
limit; ductile fracture criteria; finite element analysis  ... criteria have been widely used in the bulk forming process, they are recently introduced into the forming limit prediction in sheet metal forming processes [12-16]. In the ductile fracture criterion......
A DUCTILE FRACTURE CRITERION BASED ON THREE-DIMENSIONAL VOID MODEL X.H.Dong1,J.K.Huang1 (1.National Die & Mould CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030,China... 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......
据应力比计算断裂相关应力状态变量并不困难. 表2 韧性断裂性能研究试样归纳 Table 2 Specimens used in study of ductile fracture criteria 图2 AA7075-T6板材DIC应变路径采集 Fig. 2 Collection of stress patch for AA7075-T6... new ductile fracture criterion to principal stress space 图5 依据四种新型断裂准则绘制的FFLD Fig. 5 FFLD obtained by new ductile fracture criteria 韧性断裂准则的另一种应用途径是将准则在"断裂应变-应力三轴度"空间中表达,即断裂轨迹.该轨迹可以用于有限元仿真.商......
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; ductile fracture criteria; warm hydroforming; through-thickness normal stress 1 Introduction The forming limit of sheet metals is an important process parameter and the main basis for mould design... are difficult to be determined [5]. Recently, researchers have introduced ductile fracture criteria [6,7] into the field of sheet metal forming, such as hydroforming [8], bore expansion [9], tube bending......
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. [11] MCCLINTOCK F A. A criteria for ductile fracture by the growth of holes [J]. J Appl Mech Trans ASME, 1968, 35: 363-371. [12] RICE J R, TRACEY D. On the ductile enlargement of voids in triaxial... and simultaneous. As a result, it is not easy to cut the grains off, and outer surfaces with clean cut are formed. Key words: fine-blanking; damage; ductile fracture; mixed displacement-pressure FEM; adaptive......