铺层方式对CFRP-Al胶接接头疲劳行为的影响  

Effect of stacking sequence on fatigue behavior of CFRP⁃Al joint

作　　者：邹田春 巨乐章 管玉玺 李泽钢 陈红呈 ZOU Tianchun;JU Yuezhang;GUAN Yuxi;LI Zegang;CHEN Hongcheng(College of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学安全科学与工程学院,天津300300

出　　处：《航空学报》2023年第18期287-302,共16页Acta Aeronautica et Astronautica Sinica

摘　　要：通过Abaqus建立铺层方式为[0/90]_(4s)、[0/45/−45/90]_(2 s)、[45/−45]_(4 s)的碳纤维增强复合材料(CFRP)-铝合金单搭接胶接接头有限元仿真模型,使用循环内聚力模型(CCZM)模拟胶层的损伤演化过程,通过分析接头的刚度退化、裂纹扩展以及应力分布情况,探究铺层方式对CFRP-铝合金胶接接头疲劳行为的影响。将接头的疲劳寿命试验值与仿真值进行对比,验证该模型的有效性。结果表明:从[0/90]_(4s)到[0/45/−45/90]_(2s)再到[45/−45]_(4 s),随着CFRP层合板中±45°铺层所占比例的增加,接头损伤累积阶段占全部疲劳寿命的比例逐渐减小,疲劳裂纹扩展阶段占比逐渐增加。CFRP-铝合金胶接接头应力主要通过纤维由CFRP端向铝合金端传播,且在±45°铺层的交叉处出现的应力集中破坏了裂纹扩展速率沿搭接宽度方向的均匀性,随着±45°铺层所占比例的增加,接头搭接区域沿宽度方向的中部裂纹扩展速率与两侧区域的裂纹扩展速率差逐渐增大,胶层破坏所呈现的弧度增大。The finite element simulation model of Carbon Fiber Reinforced Plastics(CFRP)-aluminum single lap adhesive joint was established by Abaqus.The stacking sequences of CFRP laminate were set as[0/90]_(4s),[0/45/−45/90]_(2s)and[45/−45]_(4s).And the Cyclic Cohesive Zone Model(CCZM)was used to simulate the damage and evolution of the adhesive layer.The stiffness degradation,crack propagation and stress distribution of the joint were analyzed to investigate the effect of stacking sequence on the joint fatigue behavior.The experimental val⁃ues of the joint fatigue life were compared with the simulated values to verify the validity of the model.The results show that from[0/90]_(4s)to[0/45/−45/90]_(2s),then to[45/−45]_(4s),as the proportion of±45°plies in CFRP lami⁃nates increases,the proportion of the joint damage accumulation stage to the total fatigue life gradually decreases and the proportion of the fatigue crack extension stage gradually increases.In addition,the joint stress mainly propagates through the fiber from the CFRP end to the aluminum end,and the stress concentration area is prone to occur at the intersection of±45°plies,which destroys the uniformity of crack propagation rate,leading to the gradual increase in the crack growth rate difference between the middle region and the two sides of the joint with the increase of±45°plies,and eventually the radian of the adhesive layer failure increases.

关 键 词：CFRP-铝合金 铺层方式 刚度退化 裂纹扩展 应力分布 有限元仿真 

分 类 号：V257[一般工业技术—材料科学与工程] TB332[航空宇航科学与技术—航空宇航制造工程]