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为了实现基于“点阵钉模、真空负压、蜂窝夹层”的双曲度面板精密成形过程的有限元数值模拟 ,分析了成形 2个阶段的变形过程 ,建立了简化的力学模形 ,以一种广义协调薄板弯曲四边形位移单元为基础构造了具有公共横向位移自由度的几何非线性四边形四节点分别考虑和不考虑横向剪切的多层板单元 ,通过牛顿 -拉斐逊法结合载荷、位移约束量的增量法求解几何非线性方程 ,较好地再现了真实成形过程
In order to realize the finite element numerical simulation of the precision forming process of the double-curvature panel based on the “stamper, vacuum negative pressure and honeycomb sandwich”, the deformation process of the forming two stages was analyzed and a simplified mechanical model was established. Based on the generalized bent plate curved quadrilateral displacement unit, a geometrically nonlinear quadrilateral four-node quadrupole with common lateral displacement degrees of freedom is constructed, with or without consideration of lateral shearing. Based on the Newton-Raphson method combined with load and displacement The incremental method of constrained quantities solves geometric nonlinear equations and reproduces the real forming process well
