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首页> 外文期刊>Engineering Fracture Mechanics >Damage evolution and void coalescence in finite-element modelling of DP600 using a modified Rousselier model
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Damage evolution and void coalescence in finite-element modelling of DP600 using a modified Rousselier model

机译：DP600使用改进的ROUSSELIER模型的有限元建模中损伤演化和空隙聚结

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摘要

Numerical simulations of uniaxial tensile deformation of DP600 steel were carried out using a modified Rousselier ductile damage model at different strain rates ranging from 0.1 to 100 s(-1). Since the original Rousselier model does not consider any secondary void nucleation or coalescence criteria, it was modified by including a strain-controlled void nucleation function, a coalescence criterion and a void growth acceleration function as the post-coalescence regime identifier. The predicted flow behaviour, the evolution of damage and critical strain and void volume fraction at the onset of coalescence were assessed to evaluate the performance of the proposed model at each strain rate. In addition, X-ray tomography analysis was employed to evaluate the void volume fraction predicted by each void coalescence criterion. The modified Rousselier model showed good agreement with the experimentally determined strain and void volume fraction at the onset of coalescence. Also, it could successfully predict the damage distribution and the final damage geometry of DP600 tensile specimens.
机译：使用0.1至100s（-1）的不同应变率的改性的Rousselier韧性损伤模型进行DP600钢的单轴拉伸变形的数值模拟。由于原始ROUSSELIER模型不考虑任何次级空隙成核或聚结标准，因此通过包括应变控制的空隙成核功能，聚结标准和空隙生长加速功能作为后聚结的状态标识来修改。评估预测的流动行为，损伤损伤和临界应变和空隙体积分数的进展，以评估所提出的模型在每个应变率下的性能。此外，采用X射线断层扫描分析来评估每个空隙聚结标准预测的空隙体积分数。改性的ROUSELIER模型与在结合发作时的实验确定的菌株和空隙体积分数良好。此外，它可以成功预测DP600拉伸样品的损伤分布和最终损伤几何形状。

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