Abstract: In order to accurately predict the longitudinal mechanical properties of 2.5D braided composites, this work takes 2.5D equal thickness and va-riable thickness braided composites as the research object. Based on the microstructure characterization results, whole cell and triple-cell models of 2.5D equal thickness and variable thickness braided composites considering the effects of surface extrusion and yarn dislocation and slip is established. Based on the established whole cell and triple-cell geometric models, the numerical simulation analysis of 2.5D braided composites with equal thickness and variable thickness is carried out based on the progressive damage method, the longitudinal stiffness and strength of different structures are predicted, the damage propagation process and damage behavior of different structures are simulated, which is compared with the experimental results. The results show that the whole cell and triple-cell model considering the effects of surface extrusion and yarn dislocation slip can more accurately predict the mechanical properties of 2.5D braided composites; the numerical simulation results of the triple-cell model can more accurately reflect the damage propagation process of 2.5D braided composites and more comprehensively characterize the da-mage behavior of 2.5D braided composites.
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2021, Vol. 35 
