Effect of fillet on bi-adhesive bonded aluminum lap joints
(School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)
Abstract: The effect of fillet formed from structural adhesive differing in elastic modulus on the stress distribution along the length of bi-adhesive bonded single lap aluminum joints was studied under the condition of one adhesive or bi-adhesive arranged along the bondline by an elastic finite element model. The results obtained from the numerical simulation show that the fillet can reduce the peak value of stress obviously. It is not recommended to arrange a higher modulus adhesive with a lower one along the bondline for the peak stress may be maintained nearly the same. The lower the fillet formed by the elastic modulus adhesive is, the lower the stress concentration towards the end of a bonded lap joint is. It may be benefit to raise the shear strength of aluminum single lap joint.
Key words: lap-shear； aluminum； stress distribution； elastic modulus； fillet； numerical simulation