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首页> 外文期刊>Journal of Manufacturing Processes >Investigation on mechanical behavior and plastic damage of AA7075 aluminum alloy by thermal small punch test: Experimental trials, numerical analysis
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Investigation on mechanical behavior and plastic damage of AA7075 aluminum alloy by thermal small punch test: Experimental trials, numerical analysis

机译：用热小冲头试验研究AA7075铝合金的力学性能和塑性损伤：实验试验，数值分析

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The hot stamping process has demonstrated its high potential to fabricate complex-shaped automotive panel components with high strength AA7075-T6 (Al-5.37Zn-2.18Mg-1.25Cu) aluminum alloy, which conduces to product customization, cost reduction, and efficiency improvement. However, the damage-induced forming crack at high temperatures is more sensitive to the complicated process parameters. A self-developed thermal small punch test (T-SPT) was introduced to investigate the thermo-mechanical behavior and plastic damage of high-strength AA7075-T6 miniature specimens under elevated temperatures in this research. The mesoscopic damage Gurson-Tvergaard-Needleman (GTN) model was employed to predict the micro-area ductile fracture and to conduct formability prediction. An FEM inverse calibration approach coupled with the response surface method (RSM) and the genetic algorithm was developed to accurately identify the temperature-dependent GTN damage parameters based on a series of uniaxial hot tensile curves. Subsequently, numerical simulations of T-SPT regulated by GTN damage parameters were executed to compare with the experimental results. The effects on the mechanical behavior of critical process factors were further discussed, including the deformation temperature, the loading speed, and the surface friction coefficient. Finally, the GTN damage model was successfully applied to predict the formability and the damage distribution of actual AA7075-T6 B-pillar during the hot forming process. The results reveal that the numerical simulation based upon the GTN model owns high reliability and accuracy within the industrialized hot forming application.
机译：热冲压工艺已经证明了其具有使用高强度AA7075-T6（Al-5.37Zn-2.18Mg-1.25Cu）铝合金制造复杂形状的汽车面板部件的巨大潜力，这有助于产品定制，降低成本和提高效率。但是，高温下由损伤引起的成形裂纹对复杂的工艺参数更为敏感。为了研究高强度AA7075-T6微型标本在高温下的热机械行为和塑性损伤，本研究引入了自行开发的热小冲孔试验（T-SPT）。介观损伤Gurson-Tvergaard-Needleman（GTN）模型用于预测微区韧性断裂并进行可成形性预测。开发了一种有限元反校准方法，结合响应面法（RSM）和遗传算法，以基于一系列单轴热拉伸曲线准确识别温度相关的GTN损伤参数。随后，进行了由GTN损伤参数调节的T-SPT的数值模拟，以与实验结果进行比较。进一步讨论了关键工艺因素对机械行为的影响，包括变形温度，加载速度和表面摩擦系数。最后，成功地将GTN损伤模型应用于预测AA7075-T6 B柱在热成型过程中的可成形性和损伤分布。结果表明，基于GTN模型的数值模拟在工业化热成型应用中具有较高的可靠性和准确性。

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