论文部分内容阅读
为了改善叠层复合材料方板孔周应力分布,采用一种无梯度仿生技术——固定网格渐进优化方法,建立了等限制Tsai-Hill准则——即使孔周的限制Tsai-Hill值更加均匀,来求解切孔形状优化问题。用各向同性材料方板在二轴拉力荷载下单孔形状优化的例子验证了方法的正确性。研究了按照[±45°/0°/90°]对称搁置的碳纤维/环氧树脂材料准各向同性叠层复合材料方板受单拉和拉剪荷载的例子。优化后的孔形在Tsai-Hill强度值的均匀度上比正方形开孔有了显著的改善,计算结果比传统的渐进优化方法更精确和更光滑。
In order to improve the periapical stress distribution in laminated composite square plates, a constant gradient Tsai-Hill criterion was established by using a gradientless bionic technique, a fixed-grid incremental optimization method, , To solve the hole shape optimization problem. An example of the optimization of the shape of a single hole under isotropic load is given to verify the correctness of the method. An example of single-tension and tensile-shear loading of a quasi-isotropic laminated composite sheet of carbon fiber / epoxy resin material placed symmetrically at [± 45 ° / 0 ° / 90 °] was studied. The optimized hole shape has a significant improvement over the square hole in the evenness of Tsai-Hill intensity, and the result is more accurate and smooth than the traditional asymptotic optimization method.