CFRP平-折-平胶接接头疲劳寿命预测  

Fatigue life prediction of CFRP flat-joggle-flat bonded joint

作　　者：许昶 肖勇 邓鹏程 XU Chang;XIAO Yong;DENG Pengcheng(Beijing Institute of Space Launch Technology,Beijing 100076,China)

机构地区：[1]北京航天发射技术研究所,北京100076

出　　处：《北京航空航天大学学报》2025年第2期518-524,共7页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：以碳纤维增强基复合材料(CFRP)平-折-平(FJF)胶接接头为对象,通过试验拟合单向板的正则化疲劳寿命模型、剩余刚度模型及胶层的内聚力模型参数,并以此为基础通过ABAQUS软件预测了胶接接头的疲劳寿命。结果表明:在特定最大载荷条件下,预测得出的搭接区端部胶层开裂寿命与最终疲劳寿命相较于试验结果的误差值均不大于6%,具有较好的计算精度。胶接接头的搭接区端部胶层开裂寿命近似等于胶接接头最终疲劳寿命,说明搭接区端部胶层开裂寿命占胶接接头全寿命的主要部分,胶层裂纹扩展寿命可以忽略不计。Parameter fitting was done using tests for the cohesive model,the normalized fatigue life model,the stiffness degradation model of the unidirectional laminate,and carbon fiber reinforced polymer(CFRP)flat-joggle-flat(FJF)bonded joint.Based on the models mentioned above,the fatigue life of the bonded joint was predicted by using ABAQUS software.Results show that under a certain maximum load,the predicted adhesive cracking life at the end of the overlap zone and the ultimate fatigue life of the bonded joint have an error value of no more than 3%,compared with the corresponding test results,which illustrates good accuracy.It is evident that the adhesive cracking life plays a major role and that the adhesive crack propagation life can be disregarded because the adhesive cracking life at the end of the overlap zone is almost equal to the ultimate fatigue life of the bonded joint.

关 键 词：碳纤维增强基复合材料 平-折-平胶接接头 剩余刚度模型 内聚力模型 疲劳寿命 

分 类 号：TB331[一般工业技术—材料科学与工程]