Hu Haozhong, Mei Zhiyuan, Li Huadong
College of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430033, China.
Materials (Basel). 2022 Jul 29;15(15):5264. doi: 10.3390/ma15155264.
The stiffness of composite laminates is easily affected by wrinkle defects. In this paper, a new effective analytical model was proposed to predict the three-dimensional equivalent elastic properties of multidirectional composite laminates with wrinkle defects. Firstly, a geometric model was established according to the microscopic characteristics of wrinkle defects. Then, based on the classical laminate theory and homogenization method, the constitutive equation and flexibility matrix of the wrinkle region were established. Finally, the equivalent stiffness parameters of unidirectional and multidirectional laminates were derived, and the effects of different wrinkle parameters and ply-stacking sequences on the stiffness of unidirectional and multidirectional laminates were studied by using the analytical model. The results show that the mechanical properties of the lamina and laminates are affected by the out-of-plane angle and in-plane angle of the wrinkle defects. The accuracy of the analytical model has been verified by the numerical model and other theoretical models, and it has the characteristics of few parameters and a high efficiency. The analytical model can be used to predict the stiffness of composite structures with wrinkle defects simply, effectively, and quantitatively. It can also be used as a tool to provide the mechanical response information of laminates with wrinkle defects.
复合材料层合板的刚度很容易受到皱纹缺陷的影响。本文提出了一种新的有效分析模型，用于预测具有皱纹缺陷的多向复合材料层合板的三维等效弹性性能。首先，根据皱纹缺陷的微观特征建立了几何模型。然后，基于经典层合板理论和均匀化方法，建立了皱纹区域的本构方程和柔度矩阵。最后，推导了单向和多向层合板的等效刚度参数，并利用该分析模型研究了不同皱纹参数和铺层顺序对单向和多向层合板刚度的影响。结果表明，皱纹缺陷的面外角度和面内角度会影响层板和层合板的力学性能。该分析模型的准确性已通过数值模型和其他理论模型得到验证，具有参数少、效率高的特点。该分析模型可用于简单、有效、定量地预测具有皱纹缺陷的复合材料结构的刚度。它还可以作为一种工具，提供具有皱纹缺陷的层合板的力学响应信息。
