航空学报 > 2016, Vol. 37 Issue (12): 3734-3741   doi: 10.7527/S1000-6893.2016.0107

针刺C/C复合材料拉伸强度及渐进失效数值预测

谭勇洋, 燕瑛, 李欣, 郭方亮   

  1. 北京航空航天大学 航空科学与工程学院, 北京 100083
  • 收稿日期:2016-01-03 修回日期:2016-03-31 出版日期:2016-12-15 发布日期:2016-04-21
  • 通讯作者: 燕瑛,Tel.:010-82315947,E-mail:yingyan@buaa.edu.cn E-mail:yingyan@buaa.edu.cn
  • 作者简介:谭勇洋,男,硕士研究生。主要研究方向:复合材料结构设计与优化。Tel.:010-82315947,E-mail:yongyangtan@126.com;燕瑛,女,博士,教授,博士生导师。主要研究方向:复合材料力学分析与结构设计,结构损伤修理技术。Tel.:010-82315947,E-mail:yingyan@buaa.edu.cn
  • 基金资助:

    国家“973”计划(2011CB606105)

Numerical prediction of tensile strength and progressive damage of needled C/C composites

TAN Yongyang, YAN Ying, LI Xin, GUO Fangliang   

  1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China
  • Received:2016-01-03 Revised:2016-03-31 Online:2016-12-15 Published:2016-04-21
  • Supported by:

    National Basic Research Program of China (2011CB606105)

摘要:

基于金相显微镜观测的针刺C/C复合材料细观结构,考虑材料内部纤维的真实分布,建立了针刺C/C复合材料单胞模型。采用Linde失效准则,考虑纤维渐进损伤对材料进行了刚度折减,通过引入周期性位移边界条件,对针刺C/C复合材料的拉伸破坏进行了有限元法(FEM)数值模拟,分析了单胞模型的渐进失效过程,并预测了材料的拉伸强度。开展了针刺C/C复合材料拉伸试验,采用扫描电子显微镜(SEM)观察了材料的断口形貌,数值预测结果与试验吻合良好。针刺C/C复合材料受拉伸载荷后发生准脆性断裂,拉伸应力-应变曲线呈双线性,0°无纬碳布发生纤维断裂和基体开裂破坏,90°无纬碳布出现横向基体劈裂,最终断裂发生在针刺纤维与面内无纬碳布交叉区域。

关键词: 针刺C/C复合材料, 单胞模型, 拉伸强度, 渐进失效, 有限元法

Abstract:

Based on the observation of microstructures of needled C/C composites, a unit cell model which considered the true distribution of the fibers was established to predict the tensile strength and progressive damage. The finite element method (FEM) simulation of the tensile failure of the composites was conducted by using the failure criterion proposed by Linde and periodic displacement boundary conditions. The damage evolution of the composites was analyzed, which was subject to the longitudinal tensile load, and the tensile strength was predicted. By doing a quasi-static tensile test, the rupture surface of needled C/C composites was observed by scanning electron microscope (SEM). The numerical prediction was in good agreement with the test results. Quasi brittle fracture occurred under tensile load, and the stress-strain curve approximately presented bilinear shape. 0° weftless plies suffered from fiber breakage and matrix cracking damage, and 90° weftless plies from matrix damage. The final fracture occurred in the regions where the in-plain fiber and the needled fiber intersected.

Key words: needled C/C composites, unit cell model, tensile strength, progressive damage, FEM

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