基于三维载荷传递机制的单向复合材料纵向拉伸的多尺度模型

玻璃钢/复合材料, 2015, (6): 5-11.

基于三维载荷传递机制的单向复合材料纵向拉伸的多尺度模型

潘月秀 ^1, , 于雅琳 ^2, , 朱世鹏 ^3, , 祁国成 ^4, , 张博明 ^5, , 高建丽 ^6,

1.航天材料及工艺研究所先进功能复合材料技术重点实验室,北京,100076

2.北京航空航天大学材料科学与工程学院,北京,100191

3.航天材料及工艺研究所先进功能复合材料技术重点实验室,北京,100076

4.北京航空航天大学材料科学与工程学院,北京,100191

5.北京航空航天大学材料科学与工程学院,北京,100191

6.航天材料及工艺研究所先进功能复合材料技术重点实验室,北京,100076

关键词：碳纤维 , 强度 , 应力传递 , 有限元分析 , 数值分析 , 力学测试

MULTI-SCALE MODELLING OF UNIDIRECTIONAL COMPOSITE UNDER LONGGITUDINAL TENSILE LOADING BASED ON THREE-DIMENSIONAL LOAD TRANSFER MECHANISMS

Keywords： carbon fiber , strength , stress transfer , finite element analysis (FEA) , numerical analysis , mechanical testing

首先建立了单向复合材料代表性体积单元(RVE)载荷传递的三维有限元模型,阐述了载荷传递系数和载荷传递无效长度的计算方法.其次,基于单丝拉伸强度Weibull分布,引入Monte-Carlo概率随机数,建立了渐进损伤分析和强度预报的解析模型.再次,测量了东丽T700S和T800H以及国产GCT700和GCT800等四种碳纤维单丝拉伸强度,并通过拟合得到Weibull函数,作为力学模型输入;为验证模型有效性,用热压罐成型工艺制造了与碳纤维分别对应的四种单向复合材料,并测量其纵向拉伸强度.最后,模拟了单向复合材料纵向拉伸渐进损伤过程,并对四种碳纤维增强复合材料强度的预报值和实验值进行了对比分析,表明该多尺度力学模型能较为准确地预报单向复合材料损伤过程和拉伸强度.

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