不同硬化模型对铝合金板冲压成形模拟结果的影响

研究不同塑性变形硬化模型对汽车5182-O铝合金板材冲压成形模拟结果的影响。采用材料单向拉伸试验得到应力应变关系曲线，基于Hollomom、Krupskowsky与Power方程对曲线进行拟合，建立材料室温下塑性变形硬化模型，对厚度为1.5 mm和0.85 mm的5182板材进行冲压试验和有限元模拟分析，对比分析冲压试验与模拟结果。试验与模拟结果显示，当板料厚度为1.5 mm时，板料冲压试验的成形力最大为42.95 kN，板料拉深深度为30.58 mm，基于Power方程计算得到的最大成形力为41.5kN与试验结果比较接近，Hollomom方程计算得到的拉深深度为30.546 mm，板材成形厚度分布与试验结果比较接近；当板料厚度为0.85 mm时，板料冲压试验的成形力最大为34.47kN，板料拉深深度为33.792 mm，基于Power方程计算得到的最大成形力为34.27 kN与试验结果比较接近，Hollomom方程计算得到的拉深深度为33.636 mm，板材成形厚度分布与试验结果比较接近。基于三种硬化模型铝合金冲压成形过程的计算模拟分析结果，并通过与试验对比得到不同硬化模型对铝合金板材冲压成形计算模拟的影响，进一步为汽车铝合金覆盖件在成形工艺的研究分析提供理论指导。

Influence of Different Hardening Model for the Simulating Results of the Aluminum Alloy Sheet Stamping

Influence of the different plastic deformation hardening model of 5182-O aluminum alloy sheet stamping effected on simulation results is investigated. The curve of stress-strain relationship is got by the uniaxial tensile test. Based on Hollomom, Krupskowsky and Power equation the plastic deformation hardening model materials is obtained with curve fitting at room temperature. The stamping experiments and finite element simulation analysis of thickness for 1.5 mm and 0.85 mm of 5182 sheet are processed. The contrastive analysis of stamping experiment and simulation results are made. The experimental and numerical results show that forming force for 42.95 kN and maximum drawing depth for 30.58 mm with the sheet thickness for 1.5 mm, the maximum forming force for 41.5 kN based on Power equation are closed to the experiment result, the drawing depth for 30.546 mm and thickness distribution based on Hollomom equation is closed to the experiment result. The experimental and numerical results show that forming force for 34.47 kN and maximum drawing depth for 33.792 mm with the sheet thickness for 0.85 mm, the maximum forming force for 34.27 kN based on Power equation are closed to the experiment result, the drawing depth for 33.636 mm and thickness distribution based on Hollomom equation is closed to the experiment result. Simulation results of aluminum alloy stamping is processed with three kinds of hardening model. Influence of the different hardening model effected on simulation results is obtained by comparing with the sheet stamping experiment of aluminum alloy. Furthermore, the theoretical guidance is provided for research and analysis of the forming process for the automotive aluminum alloy parts.