摘要
基于ABAQUS有限元分析软件对碳纤维复合材料板平-折-平(FJF)胶接接头进行强度仿真研究,采用基于连续介质损伤力学理论的渐进损伤分析方法分析复合材料损伤,采用内聚力模型模拟胶层的失效行为,对比FJF胶接接头与平板单搭接胶接接头强度和胶层应力的差异性,探究不同几何参数对接头强度和胶层应力的影响,并对造成接头强度差异的原因进行了分析。结果表明,FJF胶接接头的主要失效模式为胶层内聚破坏。相较于平板单搭接胶接接头,FJF胶接接头有较大的损伤容限。几何参数中水平搭接长度和偏心距的改变对FJF胶接接头强度和胶层应力影响较大,利用胶层剥离应力和剪切应力的对比能较为合理地分析接头强度差异的原因。
CFRP composite is now being used for the main structure of the next generation rail vehicle.In this study,numerical analysis was carried out for the strength of CRFP Flat-Joggle-Flat bonded joint based on ABAQUS software.Composite damage was analyzed using progressive damage analysis method based on the theory of continuum damage mechanics.Failure behavior of adhesive layer was simulated with the cohesive zone model.Joint strength and adhesive stress differences between FJF bonded joint and flat adhesively bonded single-lap joint were compared.Geo-metric parameters were also considered to study the effects they have on the joint strength and the adhesive stress.A-nalysis was given for the strength difference between various joints.The results show that the main failure mode of the FJF bonded joint is the cohesive failure of the adhesive layer.Compared with the flat adhesively bonded single-lap joint,there is an increasing damage tolerance for FJF counterpart.The changes of the geometric parameters such as the horizontal lap length and the eccentricity have a great influence on the strength of the FJF bonded joint and the stress of the adhesive layer,and the reason for the difference of the strength of the joint can be analyzed reasonably by the comparison of the peel stress and shear stress of the adhesive layer.
作者
许昶
刘志明
XU Chang;LIU Zhi-ming(School of Machanical and Electronic Control Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《计算机仿真》
北大核心
2020年第1期199-205,共7页
Computer Simulation
基金
十三五国家重点研发计划(2016YFB1200505-011)。
