Xia Fei, Wang Zikun, Wang Yi, Liu Heqing, Xue Jianghong
School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China.
School of Mechanics and Construction Engineering, Jinan University, Guangzhou 510632, China.
Materials (Basel). 2024 Oct 15;17(20):5047. doi: 10.3390/ma17205047.
Delamination is a common type of damage in composite laminates that can significantly affect the integrity and stability of structural components. This study investigates the post-buckling behavior of carbon fiber-reinforced epoxy composite laminates with embedded delamination under quasi-static compression. Experimental tests were conducted using an electronic universal material testing machine to measure deformation and load-bearing capacity in the post-buckling stage. The specimens, prepared from T300 carbon fiber and TDE-85 epoxy resin prepreg, were subjected to axial compressive loads with delamination simulated by embedding Teflon films. Finite element analysis (FEA) was performed using ABAQUS software, incorporating a four-part model to simulate delaminated structures, with results validated against experimental data through comprehensive convergence analysis. The findings reveal that increasing delamination depth and length decrease overall stiffness, leading to an earlier onset of buckling. Structural instability was observed to vary with the size of delamination, while the post-buckling deformation mode consistently exhibited a half-wave pattern. This research underscores the critical impact of delamination on the structural integrity and load-bearing performance of composite laminates, providing essential insights for developing more effective design strategies and reliability assessments in engineering applications.
分层是复合材料层压板中常见的一种损伤类型，会显著影响结构部件的完整性和稳定性。本研究调查了含嵌入式分层的碳纤维增强环氧复合材料层压板在准静态压缩下的后屈曲行为。使用电子万能材料试验机进行实验测试，以测量后屈曲阶段的变形和承载能力。由T300碳纤维和TDE - 85环氧树脂预浸料制备的试样，通过嵌入聚四氟乙烯薄膜模拟分层，承受轴向压缩载荷。使用ABAQUS软件进行有限元分析（FEA），采用四部分模型模拟分层结构，并通过全面的收敛分析将结果与实验数据进行验证。研究结果表明，分层深度和长度的增加会降低整体刚度，导致更早发生屈曲。观察到结构不稳定性随分层尺寸而变化，而后屈曲变形模式始终呈现半波模式。本研究强调了分层对复合材料层压板结构完整性和承载性能的关键影响，为工程应用中制定更有效的设计策略和可靠性评估提供了重要见解。
