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《Acta Materiae Compositae Sinica》 2018-06
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Analytical solution of shear stiffness for double-lap bolted joints with clearances

KOU Jianfeng;XU Fei;ZHANG Xiaoyu;XIE Wei;FENG Wei;School of Aeronautics,Northwestern Polytechnical University;  
The joint stiffness is an important parameter in the design of composite bolted joints and is influenced largely by the bolt-hole clearance.Aiming at the elastic foundation stiffness k*c,an analytical expression was derived by introducing Liu Cai-Shan's inner cylindrical contact model.This analytical expression can take account of the bolt-hole clearance and it shows that k*cdeceases with the increase of clearance.Aiming at the nail-head restraint coefficient kr,an approximate expression was obtained by the strain energy method from a reasonable stress distribution hypothesis.Based on k*cand kr,the analytical solution of the joint stiffness was derived from an elastic foundation beam model.The load-displacement curves of double-lap bolted joints predicted by the analytical method were validated by 3-D detailed FE-models.Finally,the mechanical mechanism of the clearance influence on the joint stiffness was analyzed by finite element method.Moreover,the influences of the clearances form 1-300μm were given quantitatively by the analytic method.
【CateGory Index】: TH131.3
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