拼接铺层纤维增强复合材料连接结构设计与离散优化

Ply-overlap Fiber Reinforced Plastic Connection Structure Design and Discrete Optimization

多相离散设计是依据零件具体结构,通过各向异性材料分布,获得理想的优化设计方法。针对目前离散设计方法中相邻设计域接头间的可靠性连接问题,提出了一种拼接铺层的结构形式,为结构件设计域连接提供了一种新的方法。结合复合材料离散设计与拼接铺层结构形式,综合考虑拼接接头对零件整体性能的影响,建立复合材料离散铺层优化系统。以汽车后背门模型为例,试验测试与仿真对比,验证了所建立优化模型的结果准确性。在优化过程中引入复合材料相关制造约束和材料插值模型,使优化设计结果兼顾了良好的可实施性。应用该铺层优化设计系统,相较传统复合材料铺层设计,汽车后背门在保证零件性能指标的基础之上,总成零件重量降低28.0%,实现了更加理想的轻量化实施效果。

Multi-phase discrete design is based on the specific structure of the part, through anisotropic material distribution, to obtain an ideal optimization design method. Aiming at the reliability connection problem between adjacent design domain joints in the current discrete design method, a structure form of splicing ply is proposed, which provides a new method for structural component design domain connection. Combining the discrete materials design and the splicing laminating structure, considering the influence of splicing joints on the overall performance of the parts, a discrete layer optimization system for composite materials is established. Taking the vehicle back door model as an example, the accuracy of the established optimization model is verified by comparison between experiment and simulation. At the same time, through the introduction of composite-related manufacturing constraints and material interpolation models in the optimization process, the optimization design results have a good implementation. Applying this layer optimization design system, the mass of target automobile back door assembly is further reduced by 28.0% compared with the traditional composite material layer design. On the basis of ensuring the performance index of the parts, a more ideal lightweight implementation is realized.