Paper number 268
|STRENGTH OF ADHESIVE BONDED COMPOSITE LAP SHEAR JOINTS WITH AND WITHOUT EMBEDDED CRACKS|
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
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