C/C复合材料销钉准静态和动态剪切性能

郭飞; 李彦斌; 张培伟; 费庆国

doi:10.13801/j.cnki.fhclxb.20200722.001

C/C复合材料销钉准静态和动态剪切性能

doi: 10.13801/j.cnki.fhclxb.20200722.001

郭飞^{1, 2,},
李彦斌^{1, 3,},
张培伟^{1, 2,},
费庆国^{1, 3, ,}

1.
东南大学　空天机械动力学研究所，南京 211189
2.
东南大学　工程力学系，南京 211189
3.
东南大学　机械工程学院，南京 211189

基金项目: 国家自然科学基金(11572086；11802059)；江苏省自然科学基金(BK20170022；BK20170656)

详细信息

通讯作者:
费庆国，博士，教授，博士生导师，研究方向为复合材料参数修正及动响应预示　E-mail: qgfei@seu.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2020-06-01
- 录用日期: 2020-07-02
- 网络出版日期: 2020-07-24
- 刊出日期: 2021-05-01

Quasi-static and dynamic shear properties of C/C composite pins

GUO Fei^{1, 2
,},
LI Yanbin^{1, 3
,},
ZHANG Peiwei^{1, 2
,},
FEI Qingguo^{1, 3
, ,}

1.
Institute of Aerospace Machinery and Dynamics, Southeast University, Nanjing 211189, China
2.
Department of Engineering Mechanics, Southeast University, Nanjing 211189, China
3.
School of Mechanical Engineering, Southeast University, Nanjing 211189, China

摘要

摘要: 根据复合材料销钉剪切试验的需要，设计剪切试验装置。利用电子万能试验机和落槌冲击试验系统完成C/C复合材料销钉在准静态和动态加载工况下的面内剪切力学性能试验，并通过SEM试验系统分析其剪切失效模式和失效机制。结果表明：C/C复合材料销钉抗剪切强度具有明显的应变率效应，随着加载速率的增加，其抗剪切强度显著提高；C/C复合材料在不同加载速率下失效模式不同，准静态加载工况下纤维与基体严重剥离，纤维束丧失整体承载能力，其破坏过程表现出“伪塑性”失效特征；动态加载工况下纤维与基体未发生明显剥离，纤维束整体承载，其破坏过程表现为“脆性”失效特征。C/C复合材料在不同加载速率下剪切失效模式的不同可归结为内部缺陷扩展的应变率效应。
- C/C复合材料 /
- 剪切 /
- 应变率 /
- 失效模式 /
- 失效机制
Abstract: A shear test machine was designed according to the needs of composite pins’ shear tests. An electric universal testing machine was used to test the quasi-static in-plane shear properties of C/C composites, and a drop weight impact testing machine was used to test the dynamic in-plane shear properties of C/C composites. Then the shear failure mode and shear failure mechanism of C/C composite pins were analyzed using the SEM test apparatus. The results show that the shear failure strength of C/C composite pins is sensitive to strain rate, and it increases remarkably with the increasing strain rate. The shear failure mode of C/C composites is sensitive to the strain rate. Under quasi-static loading, the fiber/matrix interface is seriously debonded and the C/C composites show “pseudo-plastic” failure characteristics, while under dynamic loading, almost all the fibers are surrounded by matrix and the composites show “brittle” failure characteristics. The difference of C/C composites’ shear failure modes under different loading rates is related to the strain rate sensitivity of the expansion of internal-cracks.
- C/C composites /
- shear /
- strain rate /
- failure mode /
- failure mechanism

HTML全文

图 1 C/C复合材料销钉剪切测试装置

Figure 1. Shear machine of C/C composite pins

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图 2 落槌冲击试验系统

Figure 2. Drop weight impact testing machine

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图 3 C/C复合材料销钉在不同加载速率下的宏观断面

Figure 3. Macro-scale morphologies of fracture surface of C/C composite pins under different loading rates

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图 4 C/C复合材料销钉在不同加载速率下拔出纤维束的SEM图像

Figure 4. SEM images of pull-out fiber bundles of C/C composite pins under different loading rates

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图 5 C/C复合材料销钉在不同加载速率下沿剪切面剪断的纤维束SEM图像

Figure 5. SEM images of shear failure fiber bundles of C/C composite pins on the shear plane under different loading rates

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图 6 C/C复合材料销钉的典型剪切载荷-位移曲线

Figure 6. Typical shear load-displacement curves of C/C composite pins

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图 7 C/C复合材料销钉在不同加载速率下的抗剪切强度

Figure 7. Shear strength of C/C composite pins under different loading rates

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