Abstract According to meso-damage mechanics, the evolution of the volume of micro-voids is an important factor that contributes to damage and fracture. Improving the prediction accuracy of plastic deformation of aluminum alloy sheet is an important endeavor for studying the influence of various factors on plastic meso-damage evolution. Based on the GTN (Gurson-Tvergaard-Needleman) model, the meso-mechanics and damage evolution of AA5182-O rolled aluminum alloy sheet were studied in this paper. The mechanical properties were obtained through uniaxial tensile tests for studying the effect of the strain rate and sampling direction on each GTN damage parameter. Using the response surface method, the GTN model of each strain rate specimen at R00° was calibrated by the finite element method, and the influence of each damage parameter on the stress–strain and void volume evolution curves are studied. The results show that the strain rate has no effect on the initial void volume fraction and critical void volume fraction but has a significant effect on nucleation void volume fraction and fracture void volume fraction. An increase in the initial void volume fraction will cause the fracture point of the material stress–strain curve to occur earlier but has no obvious effect on the slope of the void volume evolution. As the void nucleation volume fraction increases, the highest point of the true stress–strain curve will decrease, the fracture point will advance, and the slope of the curve will increase in the uniform deformation stage of the void volume evolution. However, increasing the critical void volume fraction and fracture void volume fraction will delay the fracture point of the stress–strain curve.

中文翻译：

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基于GTN模型的AA5182-O铝合金薄板细观力学及损伤演化

摘要 根据细观损伤力学，微孔体积的演变是导致损伤和断裂的重要因素。提高铝合金薄板塑性变形的预测精度是研究各种因素对塑性细观损伤演化影响的重要努力。本文基于GTN（Gurson-Tvergaard-Needleman）模型，研究了AA5182-O轧制铝合金薄板的细观力学和损伤演化。通过单轴拉伸试验获得机械性能，以研究应变速率和采样方向对每个 GTN 损伤参数的影响。采用响应面法，对每个应变率试样在R00°下的GTN模型进行有限元法标定，并研究了每个损伤参数对应力-应变和空隙体积演化曲线的影响。结果表明，应变速率对初始孔隙体积分数和临界孔隙体积分数没有影响，但对成核孔隙体积分数和裂缝孔隙体积分数有显着影响。初始空隙体积分数的增加会导致材料应力-应变曲线的断裂点更早出现，但对空隙体积演化的斜率没有明显影响。随着空隙形核体积分数的增加，真实应力-应变曲线的最高点会降低，断裂点会提前，在空隙体积演化的均匀变形阶段曲线的斜率会增加。然而，