A dynamic explicit finite element method is used to pipe bend forming processes on bender in this paper. The degenerated shell element and co-rotational coordinate system are employed.
采用拖带坐标系下的退化壳单元，以及动态显式有限元方法求解管材在弯管机上的弯曲成型问题。
By making use of transformation of coordinate translation, coordinate rotation, we deduced general formula about area of rotational surface.
利用坐标平移、旋转变换，导出旋转曲面面积求法的一般公式。
By making use of transformation of coordinate translation, coordinate rotation, we deduced general formula about area of rotational surface.
利用坐标平移、旋转变换，导出旋转曲面面积求法的一般公式。
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