Calculation method of microscopic strength for unidirectional tape composites based on MMF theory
Based on micro mechanical failure(MMF)theory,the failure mechanism and damage process of unidirectional tape composite materials were analyzed and predicted for their load-bearing capacity and damage failure characteristics.A cross scale analysis and calculation method was proposed to determine the microscopic strength of unidirectional tape composite materials.Taking T300 carbon fiber/epoxy resin unidirectional tape composite material as the research object,a mesoscale representative volume unit finite element model of unidirectional tape composite materials was first established,and the conversion of macroscop-ic stress and microscopic stress of unidirectional tape composite materials was achieved using stress amplification factor method.Then,based on the macroscopic strength experimental results of unidirectional tape composite materials,a solution process for the microscopic strength parameters of unidirectional tape composite materials is designed to determine the microscopic strength of the fibers and matrix component of unidirectional tape composite materials.For carbon fiber/epoxy resin unidirectional tape composite materials,the maximum stress values at each key point of the carbon fiber and epoxy resin matrix can be obtained by using cross scale analysis and calculation method,and the results can be used for predicting the fatigue strength of unidirectional belt com-posite material structures.
万方数据
维普
