基于MMF理论的碳纤维单向带复合材料细观强度的计算方法  

Calculation method of microscopic strength for unidirectional tape composites based on MMF theory

作　　者：高安 GAO An(Anyang Hawk Aviation Technology Co.,Ltd.,Anyang 455000)

机构地区：[1]安阳市豪克航空科技有限公司,河南安阳455000

出　　处：《合成纤维工业》2024年第4期89-95,共7页China Synthetic Fiber Industry

基　　金：安阳市重大科技专项(2022A02GX002)。

摘　　要：针对单向带复合材料结构的承载能力和损伤失效特点,基于微观力学失效(MMF)理论对单向带复合材料的失效机制及损伤过程进行分析和预测,提出了一种确定单向带复合材料细观强度的跨尺度分析计算方法。以T300碳纤维/环氧树脂单向带复合材料为研究对象,首先建立单向带复合材料的细观尺度代表体积单元有限元模型,并采用应力放大因子方法实现单向带复合材料的宏观应力与细观应力的转换;然后结合单项带复合材料的宏观强度实验结果,设计单向带复合材料细观强度参数的求解流程,确定单向带复合材料的纤维及基体组分的细观强度。对于碳纤维/环氧树脂单向带复合材料,采用跨尺度分析计算方法可以得到碳纤维和环氧树脂基体各关键点所承受应力的极大值,其结果可用于单向带复合材料结构的疲劳强度预测。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 macroscopic 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 composite material structures.

关 键 词：碳纤维 单向带复合材料 微观力学失效理论 细观强度 计算方法 

分 类 号：TQ342.749[化学工程—化纤工业]