CFRP层合板单搭接胶接接头拉伸失效机制研究  

Research on tensile failure mechanism of single lap bonded joint of CFRP laminates

作　　者：陈禹良 张俊 吴何畏 杨柳 李建亭 CHEN Yuliang;ZHANG Jun;WU Hewei;YANG Liu;LI Jianting(School of Mechanical Engineering,Hubei University of Arts and Science,Xiangyang 441053,China;Xiangyang Key Laboratory of Intelligent Manufacturing and Machine Vision,Xiangyang 441053,China;Xiangyang Guangrui Automotive Parts Co.,Ltd.,Xiangyang 441000,China)

机构地区：[1]湖北文理学院机械工程学院,襄阳441053 [2]襄阳市智能制造与机器视觉重点实验室,襄阳441053 [3]襄阳光瑞汽车零部件有限公司,襄阳441000

出　　处：《复合材料科学与工程》2024年第10期24-31,共8页Composites Science and Engineering

基　　金：湖北省中央引导地方科技发展专项(2021BGE035);襄阳市科技计划项目(2022ABH006107)。

摘　　要：单搭接胶接是一种常见的复合材料连接方式,具有高强度和优异的耐久性等优点,在工程实际中应用广泛,但单搭接胶接接头常会发生失效和破坏。为深入研究胶接接头的失效机制,制备了不同搭接长度的单搭接胶接接头试样,使用拉伸机等设备进行拉伸试验,以获取接头的载荷-位移曲线。基于连续损伤力学模型及3D Hashin失效准则,选用Cohesive单元模拟胶层的损伤,利用有限元软件对CFRP层合板胶接接头在整个拉伸阶段中的损伤起始与演化过程进行数值模拟,试验数据验证了仿真结果的有效性。结果表明:接头失效过程经历了由胶层的裂纹产生到CFRP层间的损伤起始再到胶层的内聚失效;在拉伸载荷作用下,接头的损伤区域最先发生在接头的端头位置,随后逐步向里扩散;接头主要承受Ⅱ型断裂模式下的剪切应力和剥离应力,且剪切应力是导致损伤起始的主要原因。Single lap bonded joint is a common composite material connection method,which has the advantages of high strength and excellent durability.It is widely used in engineering practice,but the failure and damage of single lap bonded joint are often encountered.In order to further study the failure mechanism of the bonded joint,single lap bonded joint samples with different lap lengths were prepared,and the load-displacement curves of the joint were obtained by tensile tests with tensioning machines and other equipment.Based on the continuous damage mechanics model and 3D Hashin failure criterion,a Cohesive unit is selected to simulate the cohesive layer damage,and the damage initiation and evolution of the bonded joint during the whole tensile phase of CFRP laminates is simulated by finite element software.The validity of the simulation results is verified by experimental data.The results show that the failure process of the joint goes from the crack formation of the adhesive layer to the damage initiation of the CFRP layer and then to the cohesive failure of the adhesive layer.Under the action of tensile load,the damage area of the joint first occurs at the end of the joint,and then gradually spreads inward.The joint is mainly subjected to shear stress and peel stress under typeⅡfracture mode,and shear stress is the main cause of damage initiation.

关 键 词：单搭接接头 碳纤维增强塑料 损伤演化 失效机制 应力分布 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]