Unified methodology for the prediction of the fatigue behaviour of adhesively bonded joints

A unified model is proposed to predict the fatigue behaviour of adhesively bonded joints. The model is based on a damage mechanics approach, wherein the evolution of fatigue damage in the adhesive is defined as a power law function of the micro-plastic strain. The model is implemented as an external...

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Bibliographic Details
Published in:International journal of fatigue 2010-08, Vol.32 (8), p.1278-1288
Main Authors: Shenoy, V., Ashcroft, I.A., Critchlow, G.W., Crocombe, A.D.
Format: Article
Language:English
Subjects:
Adhesive joint
Adhesive strength
Applied sciences
Backface strain
Bonded joints
Crack propagation
Damage mechanics
Evolution
Exact sciences and technology
Fatigue
Fatigue (materials)
Fatigue failure
Mathematical models
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Strain
Strength degradation
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Summary:A unified model is proposed to predict the fatigue behaviour of adhesively bonded joints. The model is based on a damage mechanics approach, wherein the evolution of fatigue damage in the adhesive is defined as a power law function of the micro-plastic strain. The model is implemented as an external subroutine for commercial finite element analysis software. Three dimensional damage evolution and crack propagation were simulated using this method and an element deletion technique was employed to represent crack propagation. The model was able to predict the damage evolution, crack initiation and propagation lives, strength and stiffness degradation and the backface strain during fatigue loading. Hence the model is able to unify previous approaches based on total life, strength or stiffness wearout, backface strain monitoring and crack initiation and propagation modelling. A comparison was made with experimental results for an epoxy bonded aluminium single lap joint and a good match was found.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2010.01.013