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

复合材料科学与工程 ›› 2015, Vol. 0 ›› Issue (6): 5-11.

• 基础研究 • 下一篇

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¹, 祁国成^2*

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

收稿日期:2014-11-13 出版日期:2015-06-28 发布日期:2021-09-13
通讯作者: 祁国成(1990-),男,博士,主要从事复合材料界面研究,gcqi@buaa.edu.cn。
作者简介:潘月秀(1981-),女,博士,高工,主要从事碳纤维评价及复合材料应用研究。

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

PAN Yue-xiu¹, YU Ya-lin², ZHU Shi-peng¹, QI Guo-cheng^2*

1. Aerospace Research Institute of Materials & Processing Technology, Science and Technology on Advanced Functional Composites Laboratory, Beijing 100076, China;
2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China

Received:2014-11-13 Online:2015-06-28 Published:2021-09-13

摘要/Abstract

摘要： 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。

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

Abstract: In this work, a 3D finite element model was established as a representative volume element (RVE) to analyze the load transfer mechanism of the unidirectional composite. The load transfer efficient and ineffective transfer length was defined in the model. The Monte-Carlo simulation was conducted based on the Weibull distribution of the tensile strength in a single fiber, which can simulate the progressive failure process and predict the failure strength of the composites. The data of the tensile strength of the single fiber for Toray T700 and T800 carbon fibers along with the same level of domestic carbon fibers GCT700 and GCT800 were tested. The Weibull distribution function was obtained by fitting the experimental results of single fiber tensile tests. The longitudinal tensile properties of unidirectional composites manufactured via autoclave process were investigated for the validation of the numerical model. Simulation of the progressive failure process was conducted for the composite and the predicted tensile strength of the unidirectional composite was obtained. Furthermore, the experimental and simulated results for different unidirectional composites were compared. The predicted values were in accordance with the experimental results, which proved that the model was valid for the failure process and strength prediction.

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

中图分类号:

TB332

潘月秀, 于雅琳, 朱世鹏, 祁国成. 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[J]. 复合材料科学与工程, 2015, 0(6): 5-11.

PAN Yue-xiu, YU Ya-lin, ZHU Shi-peng, QI Guo-cheng. MULTI-SCALE MODELLING OF UNIDIRECTIONAL COMPOSITE UNDER LONGGITUDINAL TENSILE LOADING BASED ON THREE-DIMENSIONAL LOAD TRANSFER MECHANISMS[J]. COMPOSITES SCIENCE AND ENGINEERING, 2015, 0(6): 5-11.

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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

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

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