Different methods can be applied to strengthen the weakened structure in perforated composite plates. A comparison of the four reinforcement models around the hole (ring, daisy, square and ellipse) under pure tension, pure shear, and combined (both tensile and shear loads) loadings was presented using Tsai-Wu failure criteria and calculations by finite element method (FEM). Before FEM analysis, tensile tests were performed with 12 tensile- and 6 shear-test specimens made of woven carbon fiber epoxy prepreg. During the tests of shear-test specimens, the strain distribution was obtained using the digital image correlation (DIC) method. Finite element verification was performed with both the applied force-deformation curve determined in the tensile test and the strain distribution obtained by the DIC technique. It was observed that four different reinforcement models, which have 38% volume of the created lightening hole, provide at least by 30% strength improvement to the unreinforced structure under tensile and shear loadings. Under combined loadings, according to the tensile/shear load ratio, the reinforcement types provide improvements at different rates.

可以采用不同的方法来增强穿孔复合板中的薄弱结构。使用 Tsai-Wu 失效准则和有限元法计算，对纯拉伸、纯剪切和组合（拉伸和剪切载荷）载荷下孔周围的四种加固模型（环形、菊花形、方形和椭圆形）进行了比较（有限元法）。在进行 FEM 分析之前，对由编织碳纤维环氧预浸料制成的 12 个拉伸测试样本和 6 个剪切测试样本进行了拉伸测试。在剪切试验样本的测试过程中，使用数字图像相关（DIC）方法获得应变分布。利用拉伸试验中确定的作用力-变形曲线和通过 DIC 技术获得的应变分布进行有限元验证。据观察，四种不同的加固模型（其体积占所创建的减重孔的 38%）在拉伸和剪切载荷下为未加固结构提供了至少 30% 的强度改进。在组合载荷下，根据拉伸/剪切载荷比，加固类型提供不同速率的改进。