Abstract This paper introduces a rate-dependent extension of the Hosford-Coulomb ductile fracture initiation model combined with a non-local localized necking criterion (rate-dependent DSSE-HC model) for predicting ductile fracture initiation in metals with shell finite elements at high strain rates. A Johnson-Cook-type hardening model, which consists of strain hardening, rate-sensitivity, and thermal softening terms, was adopted together with an associated flow rule. The temperature was treated as an internal state variable that was calculated from the plastic strain energy using a strain-rate-dependent weighting function between the isothermal and adiabatic conditions. The parameter associated with the localized necking locus for a specific strain rate was obtained using the instantaneous strain hardening rate. The proposed extension of the DSSE-HC model was implemented in a user-defined material subroutine and validated for virtual DP590 notched tension and punch-loaded circular disc specimens by comparing with fine mesh solid element solutions.

中文翻译：

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用于预测高应变率下壳单元延性断裂的速率相关组合颈缩和断裂模型

摘要 本文介绍了 Hosford-Coulomb 韧性断裂起始模型的速率相关扩展，结合非局部局部颈缩准则（速率相关 DSSE-HC 模型），用于预测高应变下具有壳有限元的金属的韧性断裂起始。率。由应变硬化、速率敏感性和热软化项组成的 Johnson-Cook 型硬化模型与相关的流动规则一起被采用。温度被视为内部状态变量，该变量是使用等温和绝热条件之间的应变率相关加权函数根据塑性应变能计算得出的。使用瞬时应变硬化率获得与特定应变率的局部颈缩轨迹相关的参数。