Currently, continuous fiber-reinforced polymer matrix composite find extensive applications in aerospace and various other industries. These materials undergo intricate multiaxial stress states during usage, with a predominant presence of fatigue loads. Consequently, delving into the multiaxial fatigue study of composite materials becomes imperative. Research on the multiaxial fatigue of composite materials is presently categorized into three primary domains: exploration of multiaxial fatigue behavior across different specimens, identification of factors influencing such behavior, and the development of multiaxial fatigue life prediction methods. The investigation into multiaxial fatigue testing of composite materials encompasses tube-shaped, cross-shaped, and plate-shaped specimens. Among these, cross-shaped and tube-shaped specimen tests are the most prevalent. The impact of factors such as stacking sequence, multiaxial degree, and load loading methods on the multiaxial fatigue strength of composite materials under varying multiaxial fatigue loading conditions are discussed in this article. Concerning the prediction of biaxial fatigue life in composite materials, available methods predominantly consist of phenomenological models and non-classical models. While akin to uniaxial fatigue life prediction methods, these models overlook damage evolution under biaxial fatigue loads and the damage mechanisms controlling final failure. A comprehensive overview of the progress in researching multiaxial fatigue of fiber-reinforced composite materials is furnished, and an in-depth introduction is provided for the three dimensions of multiaxial fatigue. Through the synthesis and analysis of existing research findings, prospective directions for future research on multiaxial fatigue in composite materials are discussed.
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