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Abstract：
The effectiveness of a ductile fracture model in accurately predicting fracture initiation has been demonstrated. In this study, we concentrate on applying the ductile fracture model to pre-cracked structures constructed from SUS304L stainless steel with experimental and numerical analyses. The Swift hardening law was employed to extend the plastic behavior beyond the onset of necking. Additionally, the Hosford-Coulomb model, integrated with a damaged framework, was utilized to predict ductile fracture behavior, particularly under non-proportional loading conditions. Tension tests were conducted on various specimens designed to illustrate various fracture modes resulting from geometric effects. Numerical analyses were conducted to explore the loading histories, utilizing an optimization process to calibrate fracture model parameters. The proposed fracture model is validated against pre-cracked structures detailed in a reference paper. The results convincingly demonstrate that the fracture model effectively predicts both fracture initiation and propagation in pre-cracked structures.
摘要：
已经证明了韧性断裂模型在准确预测断裂萌生方面的有效性。在这项研究中,我们专注于将延性断裂模型应用于由SUS304L不锈钢构造的预裂纹结构，并进行实验和数值分析。采用Swift硬化定律将塑性行为扩展到颈缩的开始。此外,Hosford-Coulomb模型,与损坏的框架集成在一起，用于预测延性断裂行为，特别是在非比例加载条件下。在各种样品上进行拉伸测试,所述样品被设计用于说明由几何效应产生的各种断裂模式。进行了数值分析，以探索加载历史，利用优化过程来校准裂缝模型参数。所提出的断裂模型已针对参考文献中详细介绍的预裂纹结构进行了验证。结果令人信服地表明，断裂模型有效地预测了预裂纹结构中的断裂萌生和扩展。
