Paper number 268
STRENGTH OF ADHESIVE BONDED COMPOSITE LAP SHEAR JOINTS WITH AND WITHOUT EMBEDDED CRACKS |
Liyong Tong
Department of Aeronautical Engineering, University of Sydney, NSW 2006, Australia
Summary | An experimental and numerical study is presented to investigate the effect of a crack embedded in the continuous adherend at an overlap end on failure behavior of an adhesive-bonded composite lap shear joint. In the experimental part, illustrated are the effect of the crack length on failure mechanism and loads. It is found that the presence of a crack at the overlap end can significantly reduce the static failure loads of the lap shear joints. For example, the failure load of a joint with a 10 mm long crack can be decreased by up to 44% comparing to that of the non-cracked one. Finite element method is then used to study the effect of the crack on both peel and shear stress distributions in the adhesive layer. The mode I and II energy release rates are also calculated using the virtual crack closure integral method, and then used to interpret the failure mechanism. |
Keywords | damage tolerance, crack, energy release rate, failure mechanism, failure load, lap shear joint. |
Theme : Joints ; Bonded joints