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通过实验手段和有限元方法针对含孔碳纤维增强树脂基复合材料(Carbon Fiber Reinforced Polymer,CFRP)点阵夹层结构在面外载荷作用下的失效模式及其影响因素进行了研究。首先通过实验获得了含孔CFRP点阵夹层结构的失效模式,其次建立了其有限元渐进损伤失效分析模型,基于该模型对开孔形状、开孔率及开孔位置对结构弯曲强度的影响进行了探讨。结果表明,当面板较厚时,含孔CFRP点阵夹层结构的主要失效模式为节点脱粘和面板皱曲;有限元计算结果和实验结果吻合较好,极限承载力的误差约为9.1%;当开孔率φ<1.3%时,CFRP点阵夹层结构的弯曲承载能力与开孔形状基本无关;当开孔率1.3%≤φ<8.5%时,含圆形孔夹层结构的弯曲承载能力较大;当开孔率φ>8.5%时,含方孔夹层结构的弯曲承载能力较大;当开孔位于点阵夹层结构的几何中心或边缘时,对弯曲承载能力影响较大。
The failure mode and its influencing factors of CFRP sandwich structures under the out-of-plane loading were studied by means of experiment and finite element method. Firstly, the failure modes of the CFRP lattice sandwich structure with holes were obtained, and then the finite element progressive failure failure analysis model was established. Based on the model, the influence of the hole shape, the hole opening ratio and the hole position on the bending strength of the structure was investigated Exploring. The results show that when the panel is thick, the main failure modes of the CFRP sandwich with holes are node debonding and panel buckling. The calculated results agree well with the experimental results, and the ultimate bearing capacity error is about 9.1%. When the porosity is less than 1.3%, the flexural carrying capacity of the CFRP sandwich structure is basically independent of the shape of the openings. When the porosity is 1.3% ≤φ <8.5% When the hole opening ratio is more than 8.5%, the bending bearing capacity of the sandwich structure with square holes is larger. When the opening is located at the geometric center or edge of the sandwich structure, the bending bearing capacity has a great influence.