济南伸缩蓬厂

　　济南伸缩蓬作为只能抗拉的软壳体是不适宜选用这种平面单元的，因为关于刚性壳体来说，这种平板单元能够看成平面应力单元和平板曲折单元的组合，其单元刚阵可以由这两种单元刚阵兼并而成。

　　Ji'nan as the only tensile telescopic tarpaulin soft shell is not suitable to use this plane element, because of a rigid shell, the plate element can be seen as combination of plane stress element and plate winding unit, the unit stiffness matrix by the stiffness matrix of the two element and merger.

　　而膜结构作为软壳体是不能抗弯的，只能靠薄膜曲面的曲率变化，从而导致膜外表中内力重分布来反抗垂直于曲面的外荷载。

　　The membrane structure as a soft shell can not bend, can only rely on the curvature of the film surface changes, resulting in the redistribution of internal forces in the film surface to resist the external load perpendicular to the surface.

　　假如仍是选用这种只有平面内应力的板单元，则应变的线性有些将不反映平面外z方向位移的影响，这导致单元不包含z方向节点反力，就每个单元来说静力是不平衡的。

　　If the unit is still in use this only in-plane stress, the linear strain, some will not reflect the out of plane displacement of Z direction, which results in the unit does not contain the Z direction of node force, each unit is not static balance.

　　所幸的是应变的非线性有些思考了z向位移的影响，使得各单元兼并起来的总的平衡方程经过不断迭代能近似到达平衡，缺陷是需要过多的平面内位移来满意平衡的要求，而实际情况是只需要一定的平面外和平面内的位移及曲率变化就能够了。

　　Fortunately, some Z strain nonlinear thinking to the effects of the displacement, the equilibrium equations of each unit combined through continuous iteration can approximate to equilibrium, the defect is plane need too much displacement to satisfy the requirement of balance, but the actual situation is just a set of displacement and curvature change of plane and the plane can.

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　　公司:济南伸缩蓬厂

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