Gradient damage model for ductile fracture introducing degradation of damage hardening modulus: implementation and experimental investigations.
Gradient damage model for ductile fracture introducing degradation of damage hardening modulus: implementation and experimental investigations.
复制标题
引入损伤硬化模量退化的韧性断裂梯度损伤模型：实施和实验研究。
DOI：
10.1007/s10704-022-00681-9
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发表时间：
2023
影响因子：
2.5
通讯作者：
K.
中科院分区：
文献类型：
--
作者：
Han;J.;Matsubara;S.;Nishi;S.;Takada;K.;Muramatsu;M.;Omiya;M.;Ogawa;K.;Oide;K.;Kobayashi;T.;Murata;M.;Moriguchi;S.;Terada;K.
本文提出了一个韧性断裂的梯度损伤模型，其中损伤硬化模量的退化是由塑性变形的累积和负静水压力引起的体积膨胀引起的。该模型满足热力学要求，控制方程由能量最小化原理推导得出。两个参数进行了研究，以确认所提出的模型的基本性能，其中一些典型的韧性断裂响应表现出通过改变参数降低损伤硬化模量。此外，还进行了一系列数值实验，揭示了所提出的模型成功模拟具有不同抗拉强度的先进高强度钢板断裂试验的能力。与实验结果吻合较好的是，该模型能够模拟断裂伸长率、裂纹从不稳定扩展到稳定扩展的过渡行为以及相应的载荷-位移曲线。此外，该模型成功地再现和预测裂纹萌生的位置在不同的切口半径缺口试样。
This study presents a gradient damage model for ductile fracture, in which the damage hardening modulus is degraded by the accumulation of plastic deformation and the volume expansion caused by negative hydrostatic pressure. The proposed model fulfills the thermodynamic requirements, and the governing equations are derived from energy minimization principles. Two parameter studies are carried out to confirm the basic performance of the proposed model, in which some typical ductile fracture responses are demonstrated by changing parameters for degrading the damage hardening modulus. Also, a series of numerical experiments are presented to reveal the ability of the proposed model to successfully simulate the fracture tests of advanced high strength steel sheets with different tensile strengths. It is indeed confirmed by the close agreement with experimental results that the proposed model is capable of realizing the breaking elongation, the transitional behavior from unstable to stable crack propagations, and the corresponding load–displacement curves. Also, the model successfully reproduces and predicts the crack initiation positions in notched specimens with different notch radii.