Modeling on mechanical behavior and damage evolution of single-lap bolted composite interference-fit joints under thermal effects

• 作者: Junshan HU Kaifu ZHANG Hui CHENG Peng ZOU
• 来源期刊: 中国航空学报（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: Special Topic-Modeling and Simulation in Design and Manufacture of Composite Structures
• 页码范围: 230-244
• 页数: 15页
• 语种: 英文

摘要

This paper reports the modeling method and outcomes of mechanical performance and damage evolution of single-lap bolted composite interference-fit joints under extreme temperatures.The anisotropic continuum damage model involving thermal effects is established on continuum damage mechanics which integrates the shear nonlinearity constitutive relations characterized by Romberg-Osgood equation.The temperature-induced modification of thermal strains and material properties is incorporated in stress-strain analysis,extended 3D failure criteria and exponential damage evolution rules.The proposed model is calibrated and employed to simulate behavior of composite joints in interference fitting,bolt preloading,thermal and bearing loading processes,dur-ing which the influence of interference-fit sizes,preload levels,laminate layups and service temper-atures is thoroughly investigated.The predicated interfacial behavior,bearing response and failure modes are in good agreement with experimental tests.The numerical model is even capable of reflecting some non-intuitive experimental findings such as residual stress relaxation and matrix softening at elevated temperatures.