The Effects of Thermally Induced Residual Stress on the Fatigue Behaviour of Fibre Metal Laminates


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Abstract


The focus of this study is the examination and modification of existing analytical models for the calculation of effective stress intensity factor range and prediction of fatigue crack growth rates in GLass REinforced (GLARE) fibre metal laminates (FMLs). The effects of tensile residual stress have been largely unconsidered by existing models and therefore a modified model for calculating effective stress intensity factor range as well as crack propagation rate has been proposed. This modification includes the detrimental tensile residual stresses induced in the aluminum layers as a result of the laminate curing process. A previous model developed with the implementation of the fibre bridging mechanism has also been modified to include residual stress. The results of the analysis agree well with the trends and magnitudes found in the literature, though due to a lack of available experimental data, a direct evaluation of the proposed modifications was not possible.
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Keywords


Fatigue; Fibre Metal Laminates; GLARE; Residual Stress; Stress Intensity Factor

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References


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