Numerical Modeling of Stress-State Dependent Damage Evolution and Ductile Fracture of Austenitic Stainless Steel

IF 3.8 3区 工程技术 Q1 MECHANICS
Myung-Sung Kim , You-Hee Cho , Hwasup Jang
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引用次数: 0

Abstract

In this study, a stress-state-dependent elastoplastic-damage coupled constitutive model was developed and implemented into a commercial FEA program to predict the plastic behavior and fracture of 304L stainless steel. Damage evolution was experimentally quantified using unloading–reloading tensile tests, and Bonora’s damage model was applied to describe this evolution. The uncoupled damage model accurately captured the force–displacement response of smooth tensile specimens but exhibited up to an 8 % discrepancy in predicting the maximum load for notched specimens. In contrast, the coupled damage model, which accounted for stress triaxiality-dependent damage evolution, reduced this discrepancy to just 1.8 %. This study demonstrates that 304L stainless steel sheets exhibit a true stress–strain relationship that depends on stress triaxiality, and disregarding this factor can lead to notable differences in fracture predictions.
奥氏体不锈钢应力状态相关损伤演化与韧性断裂数值模拟
在这项研究中,开发了一个应力状态相关的弹塑性损伤耦合本构模型,并将其应用于商业有限元分析程序中,以预测304L不锈钢的塑性行为和断裂。采用卸载-再加载拉伸试验对损伤演化进行实验量化,并采用Bonora损伤模型对损伤演化进行描述。非耦合损伤模型准确地捕获了平滑拉伸试件的力-位移响应,但在预测缺口试件的最大载荷时显示出高达8%的差异。相比之下,考虑应力三轴依赖性损伤演化的耦合损伤模型将这一差异降低至1.8%。本研究表明,304L不锈钢板表现出真正的应力应变关系,这取决于应力三轴性,忽略这一因素可能导致断裂预测的显着差异。
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来源期刊
CiteScore
6.70
自引率
8.30%
发文量
405
审稿时长
70 days
期刊介绍: The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.
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