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无机材料学报

无机材料学报 ›› 2024, Vol. 39 ›› Issue (1): 45-50.DOI: 10.15541/jim20230237

• 研究论文 • 上一篇    下一篇

2D-SiCf/SiC复合材料层间I型断裂试验及表征

师维刚1,3,4(), 张超1,2,3, 李玫1,3, 王晶3, 张程煜1,2,3()   

  1. 1.西北工业大学 材料学院 NPU-SAS联合研究中心, 西安 710072
    2.西北工业大学 极端力学研究院, 西安 710072
    3.西北工业大学 材料学院, 西安 710072
    4.西安科技大学 理学院 力学系, 西安 710600
  • 收稿日期:2023-05-17 修回日期:2023-08-30 出版日期:2024-01-20 网络出版日期:2023-09-12
  • 通讯作者: 张程煜, 教授. E-mail: cyzhang@nwpu.edu.cn
  • 作者简介:师维刚(1988-), 男, 硕士. E-mail: swgxust@163.com
  • 基金资助:
    国家自然科学基金(U2241239);国家自然科学基金(12102336)

2D-SiCf/SiC Interlaminar Mode I Fracture Testing and Characterization

SHI Weigang1,3,4(), ZHANG Chao1,2,3, LI Mei1,3, WANG Jing3, ZHANG Chengyu1,2,3()   

  1. 1. NPU-SAS Joint Research Center, School of Materials, Northwestern Polytechnical University, Xi’an 710072, China
    2. Institute of Extreme Mechanics, Northwestern Polytechnical University, Xi’an 710072, China
    3. School of Materials, Northwestern Polytechnical University, Xi’an 710072, China
    4. Department of Mechanics, College of Science, Xi’an University of Science and Technology, Xi’an 710600, China
  • Received:2023-05-17 Revised:2023-08-30 Published:2024-01-20 Online:2023-09-12
  • Contact: ZHANG Chengyu, professor. E-mail: cyzhang@npu.edu.cn
  • About author:About author：SHI Weigang (1988-), male, Master. E-mail: swgxust@163.com
  • Supported by:
    National Natural Science Foundation of China(U2241239);National Natural Science Foundation of China(12102336)

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摘要：

二维编织碳化硅纤维增强碳化硅复合材料(2D-SiCf/SiC)在航空领域中得到广泛使用, 然而该材料层间强度低, 使其易萌生层间裂纹, 引起分层破坏。为此, 本工作采用楔形双悬臂梁法(W-DCB)和悬臂梁法(DCB)开展了层间I型断裂试验, 获得了2D-SiCf/SiC的层间裂纹驱动的加载数据, 得到了其裂纹端口张开力及张开位移变形曲线。在试验加载过程, 通过光学显微镜监测了视觉裂纹扩展过程, 探究了2D-SiCf/SiC的层间I型裂纹扩展规律。结合理论分析和裂纹视觉特征解释了加载曲线拐点及其他特征点的断裂力学含义。利用扫描电子显微镜分析了2D-SiCf/SiC的层间断面特征, 揭示了断面分层裂纹扩展机制。结果表明: W-DCB方法测量的2D-SiCf/SiC层间I型初始能量释放率与DCB方法等效; 2D-SiCf/SiC层间I型断裂过程中, 裂纹端口变形曲线的多峰性不符合经典线弹性断裂力学预测的加载峰后特征, 反映了2D-SiCf/SiC层间约束关系的复杂性; 层间断面为结构性非完全损伤, 发生了局部纤维桥连现象。

关键词: 2D-SiCf/SiC复合材料, 层间I型断裂, 表征分析, 纤维桥连

Abstract:

Two-dimensional braided silicon carbide fiber reinforced composite material (2D SiCf/SiC) is widely used in the aerospace field. However, owing to its weak interlaminar mechanical properties, this material is prone to initiation of interlaminar cracks and delamination failure. Therefore, a comparative study on the Wedge-loaded Double Cantilever Beam method (W-DCB) and the classical Double Cantilever Beam method (DCB) was conducted. The loading data of interlaminar crack-driving were obtained, and the relationship curve of crack opening force and opening displacement were obtained. During the loading, the visual crack propagation process was monitored through an optical microscope, which was to explore the interlaminar crack growth behaviors. Combined the theoretical analysis and the visual characteristics of the crack, the meaning of the inflection point and other characteristic points of the relationship curve is explained. What’s more, scanning electron microscope was used to analyze the characteristics of the interlaminar fracture surface to reveal growth mechanism of the delamination crack in the fracture surface. The results show that the W-DCB method is equivalent to the DCB method in measuring the initial energy release rate of interlaminar Mode I fracture in 2D-SiCf/SiC; In terms of 2D-SiCf/SiC interlaminar Mode I fracture, the multi-peak characteristic of deformation curve is not according with the post-peak loading curve predicted by classical linear elastic Fracture mechanics, which reflects complexity of interlaminar constraint relationship. The interlaminar section is structurally non-completely damaged, but still emerging local fiber-bridgings.

Key words: 2D-SiCf/SiC composites, interlaminar mode I fracture, characterization analysis, fiber bridging

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