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首页> 外文期刊>Engineering Fracture Mechanics >A thermo-elastic-plastic phase-field model for simulating the evolution and transition of adiabatic shear band. Part I. Theory and model calibration
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A thermo-elastic-plastic phase-field model for simulating the evolution and transition of adiabatic shear band. Part I. Theory and model calibration

机译：一种用于模拟绝热剪切带的进化和过渡的热弹性塑性相场模型。 第一部分。理论和模型校准

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摘要

Adiabatic shear band (ASB) is an important failure mode of solid materials, especially for metal materials under high strain rate loading. In this study, a thermo-elastic-plastic phase-field model, which considers both damage softening and thermal softening, is established to simulate the formation of multiple ASBs and the transition from ASB to the fracture. How to select and calibrate the material parameters in the phase-field model is seldom clearly discussed in the current phase-field model when dealing with ASB. In this paper, the damage parameters in the phase-field method are calibrated using data from pure shear specimens, taking into account both the overall response of the structure and the local response in the ASB. As an application, the calibrated model is used to numerically study the evolution of the ASB of the hat specimen and the process of its transition to the fracture. The simulation results successfully explain the typical phenomena such as transient "hot spots" and double softening in the experiment. The numerical model we developed provides a reliable quantitative description for the evolution and width calculation of ASBs and lays a foundation for the further study of ASB.
机译：绝热剪切带（ASB）是固体材料的重要性故障模式，特别是在高应变率负荷下的金属材料。在该研究中，建立了一种热弹性塑料相域模型，其考虑损伤软化和热软化，以模拟多ASB的形成和从ASB到骨折的转变。如何在处理ASB时，在当前的阶段模型中很少在当前的相位场模型中清楚地讨论如何选择和校准阶段模型中的材料参数。在本文中，考虑到结构的整体响应和ASB中的局部响应，使用来自纯剪切样本的数据进行校准相位现场方法中的损伤参数。作为应用，校准模型用于数值上研究帽子样本的ASB的演变和其过渡到骨折的过程。仿真结果成功解释了典型的典型现象，如瞬态“热点”和实验中的双重软化。我们开发的数值模型为ASB的演化和宽度计算提供了可靠的定量描述，并为ASB的进一步研究奠定了基础。

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