SEM环境下纤维推出技术结合电子束云纹技术表征复合材料界面细观力学性能

郎风超; 朱静; 李云芳; 潘俊臣; 姜爱峰; 杨诗婷; 邢永明

doi:10.13801/j.cnki.fhclxb.20190712.001

SEM环境下纤维推出技术结合电子束云纹技术表征复合材料界面细观力学性能

doi: 10.13801/j.cnki.fhclxb.20190712.001

1.
内蒙古工业大学　理学院，呼和浩特 010051
2.
中国航天科工集团第六研究院41所，呼和浩特 010010

基金项目: 国家自然科学基金（11762013；11562016；11862021）；内蒙古工业大学科学研究项目（ZZ201812；ZY201818）

详细信息

通讯作者:
邢永明，博士，教授，博士生导师，研究方向为复合材料细观力学　E-mail：xym@imut.edu.cn

中图分类号: TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2019-06-06
- 录用日期: 2019-07-05
- 网络出版日期: 2019-07-15
- 刊出日期: 2020-06-15

Characterization of interfacial meso-mechanical properties of composites using fiber push-out under SEM combing with electron beam moiré method

1.
School of Science, Inner Mongolia University of Technology, Hohhot 010051, China
2.
The 41th Institute of the Sixth Academy of China Aerospace Science & Industry Corporation, Hohhot 010010, China

摘要

摘要: 纤维推出技术是研究复合材料界面细观力学性能的常用方法。本文将该方法在SEM环境下与电子束云纹技术相结合开发一套基于SEM环境下的纤维推出实验系统。利用该系统测试了SiC/Ti-15-3复合材料的界面剪切强度、摩擦应力、摩擦系数及残余应力分布等细观力学性能。结果表明：对于厚度为500 μm的SiC/Ti-15-3复合材料界面剪切强度为35 MPa，摩擦应力为32.8 MPa，纤维与界面间的摩擦系数为0.082，径向残余应力为−400 MPa。该系统在SEM环境可以实现直径为几微米的纤维推出，扩展了纤维推出技术的应用范围，提高了纤维推出过程的对准精度，减小了测量误差。并且与电子束云纹技术相结合，实时测量纤维推出后界面残余应力分布情况，为复合材料界面的设计、评估及优化提供必要的实验方法。
- 复合材料 /
- 扫描电子显微镜 /
- 纤维推出技术 /
- 电子束云纹技术 /
- 细观力学性能
Abstract: Fiber push-out is one of the most common methods to study the interfacial meso-mechanic properties of composites. Fiber push-out test was combined with electron beam moiré method to develop a fiber push-out experimental system under SEM. The interfacial shear strength, frictional stress, coefficient of friction and residual stress of SiC/Ti-15-3 composites were characterized using this system. The results show that the interfacial shear strength, the frictional stress, coefficient of friction and the radial residual stress for SiC/Ti-15-3 composite with the thickness of 500 μm are 35 MPa, 32.8 MPa, 0.082 and −400 MPa, respectively. The minimum diameters of the pushed-out fibers can be only a few microns by this system, which expands the application field for the fiber push-out test.It’s easy to locate the indenter directly above the pushing-out fiber under SEM, which can reduce the experimental error during the launching process. The in-situ residual stress distribution around the pushed fiber was obtained combing with the electron beam moiré method. Moreover, it can provide a useful method for the design, evaluation and optimal application of composites.
- composites /
- SEM /
- fiber push-out test /
- electron beam moiré method /
- meso-mechanical properties

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图 1 纤维推出原理

Figure 1. Illustration of fiber push-out process

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图 2 压头

Figure 2. Indenter

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图 3 样品托示意图

Figure 3. Sample holder schematic diagram

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图 4 数据采集系统

Figure 4. Data collection system

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图 5 SEM环境下纤维推出系统

Figure 5. Fiber push-out system under SEM

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图 6 光栅形貌图

Figure 6. Topography of grating (1 915 lines/mm)

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图 7 纤维推出后SiC/Ti-15-3复合材料云纹图

Figure 7. Moiré fringe patter of SiC/Ti-15-3 composite after pushing-out fiber ((a) Moiré fringe patter of u field;(b) Moiré fringe of v field)

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图 8 SiC/Ti-15-3复合材料云纹图及应变场

Figure 8. Moiré fringes and strain field of SiC/Ti-15-3 composite ((a) u field moire fringe; (b) v field moire fringe; (c) Strain field of ε_xx; (d) Strain field of ε_yy)

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图 9 SiC/Ti-15-3复合材料残余应变沿图8中ab分布

Figure 9. Distribution of residual strain along ab(Fig.8) of SiC/Ti-15-3 composite

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图 10 SiC/Ti-15-3复合材料径向残余应力${\sigma _{yy}}$沿图8中ab的分布

Figure 10. Distribution of radial residual stress along ab in Fig.8 of SiC/Ti-15-3 composite

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图 11 SiC/Ti-15-3复合材料载荷-位移曲线

Figure 11. Load-displacement curves of SiC/Ti-15-3 composite

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图 12 SiC/Ti-15-3复合材料纤维推出过程示意图

Figure 12. Schematic representation for progressive debonding in push-out test for SiC/Ti-15-3 composite ((a) No deboding occurs at low load level; (b) Debonding is in progress with the increase of applied load; (c) Fiber is push out of the matrix with full debonding)

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图 13 脱粘载荷P_d与SiC/Ti-15-3复合材料试样厚度关系

Figure 13. Curve of debonding force P_d versus specimen thickness of SiC/Ti-15-3 composite

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图 14 最大载荷P_max与SiC/Ti-15-3复合材料试样厚度的关系

Figure 14. Curve of maximum force P_maxversus specimen thickness of SiC/Ti-15-3 composite

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表 1 SiC/Ti-15-3复合材料各组份性能参数^[15]

Table 1. Performance of fiber, interface and matrix for SiC/Ti-15-3 composites^[15]

Fiber Matrix

Elastic modulus/GPa 300 90
Passion’s ratio 0.17 0.33
Thermal expansion/10⁻⁶ K⁻¹ 2.6 7.6

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