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Tensile properties analysis of CFRP-titanium plate multi-bolt hybrid joints

Chinese Journal of Aeronautics 2022年第3期35卷 464-474页

作者： Yanping ZHENG Chaoyu ZHANG Ying TIE Xu WANG Mingkun LI School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China

Hybrid joints have better tensile properties than pure bonded and bolted bolts,and are increasingly used in the aerospace *** tests are carried out for the Hybrid Bonded/bolted(HBB)joints of Carbon Fiber Reinforced Polymer(CFRP)laminate and titanium alloy plate under different bolt numbers,and the corresponding load–displacement curves are *** the same time,based on Continuum Damage Mechanics(CDM)theory,which is derived from 3D Hashin failure criteria,and a Cohesive Zone Model(CZM),the tensile strength prediction model of the composite laminate-titanium alloy plate multi-bolted HBB joint was established,and the numerical simulation results were in good agreement with the experimental height,which validate the feasibility of the *** difference in the bearing capacity of HBB joints under different numbers of bolts is compared and *** this basis,the influence of inter-bolt distance on the tensile properties of the HBB joints is *** results show that the double-nail HBB joints can effectively improve the end warpage and low bearing capacity of the single-nail HBB *** tensile failure load of the double-nail HBB joints under the standard lap width(30 mm)is 82.6%higher than that of the single nail,the tensile failure load of the three-bolt HBB joints is 34.1%higher than that of the double *** the three-bolt HBB joint,the joint strength is controlled by the adhesive and the external bolt,while the internal bolt is redundant,the hybrid joint can be simplified by reducing the middle *** inter-bolt distance has a great influence on the failure load of the hybrid *** the inter-bolt distance can effectively improve the bearing capacity of the structure.

关键词： CFRP laminate Finite element model Hybrid(bonded/bolted)joint multi-bolt Tensile properties

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Analysis of Through-the-Thickness Stress Distribution in Thick Laminate multi-bolt Joints Using Global-Local Method

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Journal of Shanghai Jiaotong university(Science) 2013年第3期18卷 326-333页

作者：陈昆昆刘龙权汪海 School of Aeronautics and Astronautics Shanghai Jiaotong University

The stress distribution surrounding the fastener hole in thick laminate mechanical joints is complex. It is time-consuming to analyze the distribution using finite element method. To accurately and efficiently obtain the stress state around the fastener hole in multi-bolt thick laminate joints, a global-local approach is introduced. In the method, the most seriously damaged zone is 3D modeled by taking the displacement field got from the 2D global model as boundary conditions. Through comparison and analysis there are the following findings: the global-local finite element method is a reliable and efficient way to solve the stress distribution problem; the stress distribution around the fastener hole is quite uneven in through-the-thickness direction, and the stresses of the elements close to the shearing plane are much higher than the stresses of the elements far away from the shearing plane; the out-of-plane stresses introduced by the single-lap joint cannot be ignored due to the delamination failure; the stress state is a useful criterion for further more complex studies involving failure analysis.

关键词： thick laminate global-local through-the-thickness multi-bolt

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