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

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 in...

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Bibliographic Details
Published inChinese journal of aeronautics Vol. 34; no. 8; pp. 230 - 244
Main Authors HU, Junshan, ZHANG, Kaifu, CHENG, Hui, ZOU, Peng
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2021
College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China%School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 710072,China%Aircraft Strength Research Institute of China,Xi'an 710065,China
Subjects
Composite joints
Damage evolution
Interference fit
Mechanical behavior
Thermal effects
Composite joints
Interference fit
Mechanical behavior
Damage evolution
Thermal effects
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Summary: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, during which the influence of interference-fit sizes, preload levels, laminate layups and service temperatures 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.
ISSN:1000-9361
DOI:10.1016/j.cja.2020.09.023