Analytical prediction model for non-symmetric fatigue crack growth in Fibre Metal Laminates

•Crack asymmetry in FMLs consists of delamination asymmetry and crack tip asymmetry.•Asymmetric bridging stresses affect the growth rates of two crack tips in FMLs.•Asymmetric COD analysis is essential for determining bridging stresses in FMLs. This paper proposes an analytical model for predicting...

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Bibliographic Details
Published in:International journal of fatigue 2017-10, Vol.103, p.546-556
Main Authors: Wang, Wandong, Rans, Calvin, Benedictus, Rinze
Format: Article
Language:English
Subjects:
Crack opening displacement
Crack propagation
Crack tips
Cracks
Deformation
Delamination
Fatigue failure
Fiber-metal laminates
Fibre metal laminates
Fracture mechanics
Laminates
Linear elastic fracture mechanics
Load transfer
Materials fatigue
Mathematical models
Non-symmetric crack
Prediction models
Stress intensity factor
Tips
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Summary:•Crack asymmetry in FMLs consists of delamination asymmetry and crack tip asymmetry.•Asymmetric bridging stresses affect the growth rates of two crack tips in FMLs.•Asymmetric COD analysis is essential for determining bridging stresses in FMLs. This paper proposes an analytical model for predicting the non-symmetric crack growth and accompanying delamination growth in FMLs. The general approach of this model applies Linear Elastic Fracture Mechanics, the principle of superposition, and displacement compatibility based on the understanding of deformation behaviour in eccentrically cracked metal panels. The non-symmetric crack growth behaviour of two crack tips and accompanying asymmetric load transfer from the eccentrically cracked metal layers to the intact bridging fibres are successfully predicted with the model. The predicted crack growth rates and delamination evolution are compared to test data, good correlation is observed.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2017.06.035