Optimizing damage resistance of composite under low-velocity impact based on the application of solid-shell coupling model
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摘要: 为优化复合材料层压板的冲击损伤阻抗, 提出了基于实体-壳耦合模型的优化方法。模型以实体单元模拟冲击点区域, 以壳单元模拟周围区域, 采用耦合约束连接实体与壳, 引用渐进损伤材料本构, 提出了冲击下与纤维方向种数相关的损伤变量, 优化过程利用遗传算法。通过算例对冲击阻抗的优化方法进行了验证, 并对复合材料盒段壁板进行了铺层优化。结果表明: 基于实体-壳耦合模型的遗传优化方法, 计算效率高, 收敛速度快, 提高了层压板的抗冲击性能。Abstract: For optimizing damage resistance of composite laminates under impact, a method of optimization based on solid-shell coupling finite element(FE) model was presented. Solid element was used to simulate the impact region, and shell element was used in the other region of the laminates in the model. They were connected by coupling constraint. A damage variable related to the number of fiber orientations was developed in the application of progressive damage material constitutive relationship. Optimization was implemented by genetic algorithm. Effectiveness of the damage resistance optimization method was demonstrated by classical examples. Ply stacking method of composite wing-box panel aiming at impact damage resistance was optimized. Results indicate that the method of genetic algorithm optimization based on solid-shell coupling model is highly efficient and well convergent. The performance of laminates against impact loading was improved.
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Keywords:
- solid-shell coupling /
- composite /
- impact /
- damage resistance /
- optimization /
- genetic algorithm
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