复合材料科学与工程 ›› 2023, Vol. 0 ›› Issue (2): 14-23.DOI: 10.19936/j.cnki.2096-8000.20230228.002

• 基础研究 • 上一篇    下一篇

基于改进三胞模型考虑孔隙缺陷的三维四向编织复合材料多尺度力学性能分析

张怀, 李成*, 刘乐, 龚桂林   

  1. 郑州大学 机械与动力工程学院,郑州 450001
  • 收稿日期:2022-01-10 出版日期:2023-02-28 发布日期:2023-04-28
  • 通讯作者: 李成(1962—),男,教授,博士生导师,主要从事复合材料结构强度方面的研究,chengli@zzu.edu.cn。
  • 作者简介:张怀(1996—),男,硕士研究生,主要从事复合材料力学性能方面的研究。
  • 基金资助:
    国家自然科学基金民航联合基金(U1833116)

Multi-scale mechanical properties analysis of three-dimensional four-direction braided composites considering pore defects based on improved three-cell model

ZHANG Huai, LI Cheng*, LIU Le, GONG Guilin   

  1. School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
  • Received:2022-01-10 Online:2023-02-28 Published:2023-04-28

摘要: 编织复合材料在制造过程中不可避免地会出现孔洞缺陷,这些缺陷直接影响编织复合材料的力学性能。基于开源软件TexGen[1]实现编织复合材料内胞、面胞和角胞的参数化建模,在面胞和角胞模型中均考虑了纱线轨迹在空间中的偏移和受到打紧工序时纱线之间的相互挤压。利用random函数在微观尺度微观模型的基体中引入孔隙单元来模拟纤维束内干斑,在细观尺度上的三单胞模型基体中引入孔隙单元来模拟纤维束间孔隙,在宏观尺度上建立含内胞、面胞、角胞细观单元宏观均质模型对宏观弹性常数进行预测。结果表明:①孔隙率对细观尺度三类单胞模型的弹性常数影响程度不同;②纤维束内干斑孔隙对宏观弹性性能的影响要大于纤维束间孔隙,随着干斑孔隙率Pm增加,纵向泊松比减小,而随着纤维束间孔隙率Pn增加,纵向泊松比呈现出递增的趋势。

关键词: 三维四向编织复合材料, 孔隙率, 三单胞模型, 多尺度

Abstract: Hole defects inevitably occur in the manufacturing process of braided composites, which directly affect the mechanical properties of braided composites. Based on the open source software TexGen[1], parametric modeling of the inner cell, face cell and corner cell of braided composites was carried out. In the face cell and corner cell models, the deviation of yarn trajectory in space and the extrusion deformation when subjected to the tightening process are considered. The random function is used to introduce pore units into the matrix of microscopic model at micro scale to simulate dry spots in fiber bundles, and pore units are introduced into the matrix of tri-cell model at micro scale to simulate pores between fiber bundle. On macro scale, a macroscopic homogeneous model with inner cell, face cell and corner cell is established to forecast the macroscopic elastic constants. The results show that: ① The porosity has different effects on the elastic constants of the three types of microcellular models; ② The influence of dry spot pores in fiber bundles on macroscopic elastic properties is greater than that between fiber bundles. With the increase of dry spot porosity Pm, the longitudinal Poisson’s ratio is reduced, while with the increase of porosity Pn between fiber bundles, the longitudinal Poisson’s ratio presents the increasing trend.

Key words: three-dimensional four-direction braided composites, porosity, tri-cell model, multi-scale

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