Fatigue Damage Evaluation through Stiffness Measurements in Boron-Epoxy Laminates

  • O'brien T
  • Reifsnider K
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Abstract

Stiffness reductions, resulting from fatigue damage, were measured for unnotched [{+/-}45]s, [0/90] s, and [0/90/ {+/-}45 ] s boron/epoxy laminates. Deg radation in the various in-plane stiffnesses (Exx, Byy, Gxy) were measured using a combination of uniaxial tension, rail shear, and flexure tests. An attempt was made to predict stiffness loss at failure from a secant modulus criterion. Damage growth and stiffness loss were load-history dependent, hence, the secant modulus criterion is not a valid criterion for general application.

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Authors

  • T. Kevin O'brien

  • Kenneth L. Reifsnider

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