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<p>Although natural fiber composites are actively studied for their static mechanical properties, a significant knowledge gap remains concerning their cyclic fatigue loading behavior, especially regarding the role that matrix stiffness plays in damage development. In this framework, the present study exposes specimens to a large number of fatigue cycles (up to 1,000,000) and subsequently measures changes in tensile stress, strain, modulus, and rupture work. Using a unique multiscale approach that links macroscopic mechanical degradation to microscopic failure mechanisms such as fiber pull-out, interface debonding, and matrix rupture, ANOVA statistical analysis was performed to reinforce the findings by identifying the key factors—fatigue life and matrix stiffness—that drive mechanical degradation. This research advances understanding of fatigue in bio-based composites and offers valuable design recommendations from an engineering perspective, positioning the sisal-polyester system as an environmentally friendly yet structurally reliable alternative for automotive and other cyclic-loading applications.</p>

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Influence of Matrix Hardness on the Fatigue Behavior of Sisal/Polyester Composites: Implications for Automotive Applications

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Magdi El Messiry,
  • Marwa Elmor

摘要

Although natural fiber composites are actively studied for their static mechanical properties, a significant knowledge gap remains concerning their cyclic fatigue loading behavior, especially regarding the role that matrix stiffness plays in damage development. In this framework, the present study exposes specimens to a large number of fatigue cycles (up to 1,000,000) and subsequently measures changes in tensile stress, strain, modulus, and rupture work. Using a unique multiscale approach that links macroscopic mechanical degradation to microscopic failure mechanisms such as fiber pull-out, interface debonding, and matrix rupture, ANOVA statistical analysis was performed to reinforce the findings by identifying the key factors—fatigue life and matrix stiffness—that drive mechanical degradation. This research advances understanding of fatigue in bio-based composites and offers valuable design recommendations from an engineering perspective, positioning the sisal-polyester system as an environmentally friendly yet structurally reliable alternative for automotive and other cyclic-loading applications.