Geometrically non-linear thermal stress analysis of an adhesively bonded tubular single lap joint

In this study, the geometrically non-linear thermal stress analysis of an adhesively bonded tubular single lap joint subjected to air9ows having di:erent temperature and velocity outside and inside its inner and outer tubes was carried out using the incremental "nite element method. Since the thermal expansion coe<cients of tubes and adhesive were di:erent the thermal strains arising along the adhesive-tube interfaces resulted in high thermal stresses in the adhesive layer and tubes for di:erent end conditions applied to the ends of its outer and inner tubes. The joint region was considerably deformed, and serious stress concentrations occurred around the adhesive free ends. This e:ect became more evident in cases the tube edges were fully restrained. The peak thermal adhesive and tube stresses occurred at the free ends of the adhesive-tube interfaces. In addition, increasing the overlap length had an e:ect of reducing the peak adhesive and tube stresses, and an optimum overlap length=joint length ratio of 0.2 was determined.