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Abstract

In this paper, a wear-out model, which is based on the concept ofdeterministic strength degradation and equal ranking between static and residualstrengths, is used to assess the fatigue behaviors of several different sandwich beams.The model requires only two parameters to describe the strength degradation infatigue. One parameter represents the rate of strength degradation and the othera relative fatigue life. A new approach is used to determine these parameters fromexperimental data. The model is shown to be able to describe rather well both thestatic strength distributions and the fatigue stress-life relations of the sandwichbeams. The residual strength distribution after 5000 cycles was predicted for theEglass–vinylester–D100 balsa wood sandwich at 60% maximum stress level with thef and s obtained through the fitting method developed in this paper. There is a goodagreement between prediction and experiment.

Keywords

composites sandwich beams fatigue residual strength

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References

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Fatigue Analysis of Sandwich Beams Using a Wear-Out Model

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