Abstract:
The deep drawing process, a pivotal technique in sheet metal forming, frequently encounters challenges such as anisotropy-induced defects. This study comprehensively investigates the influence of various yield criteria on the anisotropic behavior and fracture prediction in SECC steel cylindrical cups. It integrates Hill\'48R, Hill\'48S, and von Mises yield criteria in conjunction with Swift\'s hardening law to evaluate material behavior under complex stress states. Experimental and numerical simulations assess the anisotropy effects across multiple orientations (0°, 45°, and 90°), revealing intricate relationships between stress criteria and material response. The findings indicate significant discrepancies between isotropic and anisotropic models in predicting fracture heights, emphasizing the importance of selecting appropriate yield criteria. Notably, the von Mises criterion results in lower fracture heights, suggesting higher susceptibility to fractures, while the Hill\'48R model aligns closely with experimental data, validated through variations in punch corner radius and blank holder force parameters, with a maximum deviation of 3.23%. Hill\'48S displays moderate plastic deformation characteristics.
摘要:
拉深过程,钣金成形中的关键技术,经常遇到的挑战,如各向异性引起的缺陷。本研究全面调查了各种屈服准则对SECC钢圆柱杯各向异性行为和断裂预测的影响。它集成了Hill\'48R,希尔\'48S,和vonMises屈服准则结合Swift的硬化定律来评估复杂应力状态下的材料行为。实验和数值模拟评估了跨多个方向(0°,45°,和90°),揭示了压力标准和物质反应之间的复杂关系。研究结果表明,各向同性和各向异性模型在预测裂缝高度方面存在显著差异,强调选择适当产量标准的重要性。值得注意的是,vonMises准则导致较低的裂缝高度,提示更容易骨折,而Hill\'48R模型与实验数据密切相关,通过冲头拐角半径和压边力参数的变化进行验证,最大偏差为3.23%。Hill\'48S表现出中等塑性变形特征。