Tensile performances of single-lap countersunk composite joints with metallic bushing

Xiaoquan Cheng, Xiaoyuan Du, Kun Chen, Maosheng Shu, Xiaodong Liu and Gang Chen

Abstract

Tensile tests were carried out on the single-lap countersunk composite joints with metallic bushing, and the load-displacement curves, strains and damage morphologies around the bolt hole were measured. A 3D progressive damage finite element model (FEM) was established in ABAQUS/Standard and verified by experimental results. Based on the validated model, tensile performances of the joints were investigated, including damage mechanism analysis of the laminate and the effect discussion of bushing thickness, tightening torque, interference fit size and etc. The results show that metallic bushing can improve ultimate bearing load of the joints. The stress distribution and initial damages caused by assembly around the laminate hole are little affected by bushing thickness. Appropriate tightening torque and interference fit size can improve tensile performances of the joint.

Key Words

bearing load; countersunk composite joints; interference fit; metallic bushing; tightening torque

Address

Xiaoquan Cheng: School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China Xiaoyuan Du: School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China; The 28th Research Institute of China Electronics Technology Group Corporation, Nanjing 210007, China Kun Chen: School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China; The Second System Design Department of the Second Research Academy of CASIC, Beijing 100854, China Maosheng Shu and Xiaodong Liu: AVIC Chengdu Aircraft Design and Research Institute, Chengdu 610041, China Gang Chen: The Second System Design Department of the Second Research Academy of CASIC, Beijing 100854, China

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