C/SiC复合材料连接结构拉脱失效机制

李志强; 吴振强; 杨凌霄; 李尧; 刘宝瑞

C/SiC复合材料连接结构拉脱失效机制

1.
北京强度环境研究所可靠性与环境工程技术重点实验室, 北京 100076
2.
北京临近空间飞行器系统工程研究所, 北京 100076

基金项目: 国家自然科学基金 (U20B2002；52202082；12002056)

详细信息

通讯作者:
吴振强，博士，研究员，研究方向为结构强度与失效分析　E-mail: wuzhenqiang@126.com

中图分类号: TB332
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- 文章访问数: 125
- HTML全文浏览量: 62
- 被引次数: 0
出版历程
- 收稿日期: 2023-02-08
- 修回日期: 2023-03-05
- 录用日期: 2023-03-31
- 网络出版日期: 2023-04-12

Pull-out failure mechanism of C/SiC composite connection structure

1.
Science and Technology on Reliability and Environment Engineering Laboratory, Beijing Institute of Structure and Environment Engineering, Beijing 100076, China
2.
Beijing Institute of Near-Space Aircraft System Engineering, Beijing 100076, China

Funds: The National Natural Science Foundation of China (U20B2002; 52202082; 12002056)

摘要

摘要: C/SiC陶瓷基复合材料由于具备高强度、高模量、耐高温等特点，广泛应用于飞行器的热防护结构以及热端部件上。由于常规的金属紧固件无法承受热防护结构以及热端部件经历严酷的高温环境，因此C/SiC复合材料连接结构大量的使用在热端部件的紧固和连接中。本文针对C/SiC复合材料连接结构设计了H型连接结构试件，开展沿螺钉轴向的单轴拉伸试验，采用宏观测试与细观测试相结合的方式研究了陶瓷基C/SiC连接结构的拉脱失效机制。研究结果表明C/SiC连接结构的受到制备工艺、材料初始缺陷以及初始连接状态的影响，导致连接结构初始加载阶段的刚度有所差异、最大拉伸载荷存在着离散性，并且加载过程中存在着非线性现象。CT测试结果表明连接结构螺纹孔变形挤压导致材料分层，螺纹丧失承载能力是引发结构拉脱失效的主要原因。1C/SiC连接结构力学行为规律(a)和细观损伤检测结果分析(b)
- C/SiC复合材料 /
- 连接结构 /
- 拉脱失效 /
- 损伤演化 /
- CT检测
Abstract: Through uniaxial tensile test of C/SiC ceramic matrix composite connection structure, the change law of mechanical properties of connection structure during pull-off failure was studied. Combined with strain measurement, high-speed camera, CT detection and other test methods, the damage evolution process of the connection structure during the pull-off failure process was explored from the macro and micro perspectives, and the pull-out failure mechanism of the ceramic matrix composite connection structure was determined. The results show that the initial stiffness of different connection structures is inconsistent due to the difference of the deposition and contact state of the thread. As the displacement increasing, the stiffness of the connecting part tends to be consistent. Damage and delamination occur when the threaded hole is squeezed during loading. When the local damage of the threaded hole reaches a certain degree, the connecting structure reaches the maximum bearing capacity. At this time, as the displacement continues to increase, the screw begins to pull out, and the bearing capacity begins to decline until the screw is completely pulled out.
- C/SiC composites /
- connection structure /
- pull-out failure /
- damage evolution /
- CT detection

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图 1 H型连接结构试件示意图

Figure 1. Diagram of H-shape connection structure

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图 2 试件安装状态

Figure 2. Test piece installation status

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图 3 C/SiC连接结构试件的载荷-位移曲线

Figure 3. Load-displacement curve of C/SiC connection structure test piece

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图 4 C/SiC连接结构试件T1的载荷-位移曲线及连接界面变化

Figure 4. Load-displacement curve and change of connection interface of C/SiC connection structure test piece T1

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图 5 C/SiC连接结构试件试验后状态

Figure 5. State of the C/SiC connection structure specimen after test

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图 6 试验前C/SiC连接结构CT检测结果

Figure 6. CT results of C/SiC connection structure before test

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图 7 试验后C/SiC连接结构CT检测结果

Figure 7. CT results of C/SiC connection structure after test

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图 8 应变花安装位置

Figure 8. Installation position of strain gage

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图 9 C/SiC连接结构连接部位应变变化规律

Figure 9. Strain change rule of connection part of C/SiC connection structure

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