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Fatigue Analysis of Sandwich Beams Using a Wear-Out Model

Mechanical & Aerospace Engineering DepartmentUniversity of California, Los Angeles48–121 Engineering IV, PO Box 951597Los Angeles, CA 90095-1597, USA

H. Thomas Hahn

Mechanical & Aerospace Engineering DepartmentUniversity of California, Los Angeles48–121 Engineering IV, PO Box 951597Los Angeles, CA 90095-1597, USAHahn{at}ime.ucla.edu

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.

Key Words: composites • sandwich beams • fatigue • residual strength

Journal of Composite Materials, Vol. 38, No. 7, 581-589 (2004)
DOI: 10.1177/0021998304042398


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