变刚度纤维曲线铺放复合材料层合板的有限元建模和拉伸特性分析

通过对变刚度铺放路径进行数学建模,得到变刚度复合材料层合板的拓扑构型,对复合材料层合 板内每个离散单元的每个铺层进行纤维角度和铺层厚度的独立设计。然后将拓扑构型数据导入有限元分析软 件GENESIS 中,实现层合板铺层信息的可视化显示和拉伸性能的分析,得出层合板的弹塑性本构关系。通过 仿真数据与实验测试数据进行对比,得出在所构建的变刚度复合材料层合板模型上进行拉伸实验仿真的准确 度可达95% 。该方法不仅可以可视化地展现出铺放过程中发生重叠的位置、整个复合材料层合板的厚度分布 以及每层上铺放角的分布,还可对其在弹塑性范围内的拉伸性能进行精确仿真。

Finite Element Modeling and Tensile Properties Analysis of Curvelinear Fiber-Placed Variable-Stiffness Composite Laminates

Through the mathematical modeling of the variable-stiffness tow path, the topological structure of the variable-stiffness laminate is modeled. The fiber-angle and the layer-thickness of each lamina on each discrete unit can be designed independently. Then the topological structure is translated into GENESIS, in which the internal structure of the laminate is visualized, and the tensile properties of each lamina are analyzed. By comparing of the simulated results and the experimental data, the accuracy of the variable stiffness laminate tensile model is 95%. This method visibly reveals the location of the overlapped units, the distribution of the thickness and the distribution of fiber angle on each ply. It also accurately simulates the tensile properties of the laminate within the plastic range.