此外，凸耳孔壁表面的加工缺陷也是降低凸耳疲劳寿命的一个重要因素。
In addition, another important factor of decreasing lives of lugs is machining defects in hole wall surfaces of lugs.
发动机机匣上安装凸台结构，可简化为机匣壳体开孔后用围壁和加强板组合补强的力学模型。
On engine cases, installation base can be simplified by a mechanics model, which is case shell with hole and a complex of enclosing wall and reinforcing plate for increase strength.
设计不同的凸模下压速度、不同壁厚方案并完成相应的数值模拟。
A scheme of different loading speeds and wall thickness was designed and simulated.
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