Transactions of Materials and Heat Treatment

Title：An improved ductile fracture criterion for metal sheet based on DF series

Authors： Wang Lihong1 2 Lyu Lin1

Unit： 1. Locomotive and Vehicle College Zhengzhou Railway Vocational & Technical College 2. Henan Engineering Research Center of Rail Transit Intelligent Security Zhengzhou Railway Vocational & Technical College

KeyWords： ductile fracture stress state uncoupled criterion void necking coalescence void growth ductile metal

ClassificationCode：U287.1

year,vol(issue):pagenumber：2024,49(10):256-264

Abstract：

To accurately describe the fracture behavior of ductile metal under different stress states, an improved ductile fracture criterion based on the DF series was proposed by analyzing the mechanism of nucleation, growth and polymerization of internal micro-voids for materials during plastic deformation, which fully considered the influence of void necking coalescence mechanism on the ductile fracture behavior of material, and the physical meaning of each parameter was clarified. Then, the equivalent fracture strain envelope surfaces of AA 2024-T351 aluminum alloy and AISI 1045 carbon steel were constructed by the proposed ductile fracture criterion, and the predicted fracture strain values under corresponding stress states were compared with the experimental results of previous scholars to verify the effectiveness of the proposed new criterion. Finally, the predicted results are compared with those of the widely used DF2016, Hu and Mu Lei criteria. The results show that compared with the other three kinds of models, the proposed new criterion has the lowest average prediction error and the maximum prediction error, and the prediction accuracy is highest. Thus, the mechanism of void necking coalescence plays an important role in fracture process of ductile metal and should be fully considered.

Funds：

河南省高等学校重点科研项目（24B580007）；郑州铁路职业技术学院科技攻关项目（2024KY008）

作者简介：王丽红（1980-），女，硕士，副教授,E-mail：honly_lee@sina.com

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