另外，根据试验结果，并利用塑性力学中的主应力法和材料硬化理论，推导了一个计算圆孔翻边力的新公式。
In addition, according to experimental results, slab method in plastic mechanics and material hardening theory, a new formula for hole flanging force is concluded.
针对方孔翻边问题进行了编程式参数化有限元法研究，其结果与现有文献试验结果基本吻合；
The programming PFEA approach is researched by square hole flanging, and the result accords with the experimental result from publications.
然后开展了凸、凹弧翻边的回弹试验，通过对试验数据的统计分析，得出了各因素及交互作用对回弹量的影响大小。
Then experiments on springback in concave and convex edge flanging are carried out, significance of factors and their interactions are studied with statistics approach.
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