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<p>In the present paper, the influence of fatigue damage on the mechanical behavior of carbon fiber reinforced plastic (CFRP) under static ± 45° tension has been investigated. Primary experimental data were provided for CFRP specimens (with [± 45]<sub>5</sub> layup) after static, cyclic tests and their combination. A postcritical deformation stage, also known as the necking stage, characterized by stress reduction during strain growth realization, has been found. A novel model has been developed to describe stiffness degradation during fatigue tests. A significant influence of preliminary cyclic loading on the composite’s properties and stress-strain curves has been found out. Inhomogeneous strain fields have been observed by using the digital image correlation method. Acoustic emission signals have revealed typical defects of the material’s structure; results have been confirmed by optical microscopy. The rationality of further investigation of fatigue damage influence on the mechanical behavior of CFRP has been concluded.</p>

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Influence of Fatigue Damage on Mechanical Behavior of Laminated Composite Under ± 45° Tension

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Oleg Staroverov,
  • Artur Mugatarov,
  • Elena Strungar,
  • Ekaterina Chebotareva,
  • Valeriy Wildemann

摘要

In the present paper, the influence of fatigue damage on the mechanical behavior of carbon fiber reinforced plastic (CFRP) under static ± 45° tension has been investigated. Primary experimental data were provided for CFRP specimens (with [± 45]5 layup) after static, cyclic tests and their combination. A postcritical deformation stage, also known as the necking stage, characterized by stress reduction during strain growth realization, has been found. A novel model has been developed to describe stiffness degradation during fatigue tests. A significant influence of preliminary cyclic loading on the composite’s properties and stress-strain curves has been found out. Inhomogeneous strain fields have been observed by using the digital image correlation method. Acoustic emission signals have revealed typical defects of the material’s structure; results have been confirmed by optical microscopy. The rationality of further investigation of fatigue damage influence on the mechanical behavior of CFRP has been concluded.