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<p>This paper investigates the fatigue life of glass fiber-reinforced polyester composite material for various water immersion periods (90, 180, and 270 days). The fatigue test is a three-point bending cyclic constant-amplitude low-rate loading with a frequency of 1.25 Hz under normalized stress percentages of 80%, 70%, 60%, 55%, 45%, 35%, and 25%. A gradual decrease in fatigue resistance was observed with increasing water immersion time. Experimental data were correlated using the two-parameter Weibull distribution to determine failure probabilities and to plot S–N curves at different levels of reliability. These curves are of considerable value to designers, as they allow the fatigue life to be determined for any survival probability.</p>

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Effect of Water Absorption on the Weibull Distribution of Fatigue Test in Glass-Reinforced Polyester Composite Materials

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • D. Djeghader,
  • T. Tioua

摘要

This paper investigates the fatigue life of glass fiber-reinforced polyester composite material for various water immersion periods (90, 180, and 270 days). The fatigue test is a three-point bending cyclic constant-amplitude low-rate loading with a frequency of 1.25 Hz under normalized stress percentages of 80%, 70%, 60%, 55%, 45%, 35%, and 25%. A gradual decrease in fatigue resistance was observed with increasing water immersion time. Experimental data were correlated using the two-parameter Weibull distribution to determine failure probabilities and to plot S–N curves at different levels of reliability. These curves are of considerable value to designers, as they allow the fatigue life to be determined for any survival probability.