Analysis of damage characteristics of high-temperature ceramic matrix composite under tensile loading
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摘要: 基于声发射(AE)信号和计算机断层扫描(CT)成像技术,开展了高温复合材料的内部损伤状态分析。通过声发射技术获得复合材料损伤时的宏观应力波信号,分析得到声发射信号的频率等波形特征参数;通过计算机断层扫描得到复合材料结构内部微细观三维损伤图像,判断存在的损伤类型。结果表明,不同工艺陶瓷基高温复合材料在拉伸载荷下,内部会产生不同类型的损伤,纤维束与基体之间的脱黏开裂所对应的声发射信号特征频率为44 kHz,基体失效的特征频率为150 kHz,纤维束断裂损伤的特征频率为250 kHz。Abstract: The damage characteristics of the acoustic emission signals produced in high temperature ceramic matrix composites were analyzed based on the relations between acoustic emission (AE) signals and X-ray CT images. The characteristic parameters including the frequencies of AE signals were obtained by analyzing the signals of macroscopic stress waves in the case of composite damage by using AE technology. Existing damage types can be confirmed by the microscopic 3D damage images of composite structures were obtained by CT method. The results showed that different types of damage can generate in the interior of ceramic matrix composite specimens fabricated by different processing techniques under tension load. The corresponding frequency of AE signals for the delaminations between fiber bundles and the matrix damage and fiber bundle fracture were respectively 44 kHz, 150 kHz and 250 kHz.
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Keywords:
- acoustic emission /
- computed tomography /
- damage mode /
- ceramic matrix composite
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[1] 王宗炼,任会兰,宁建国.基于小波变换降噪的声发射源定位方法[J].振动与冲击,2018,37(4):226-232,248. [2] 宋义敏,邢同振,赵泽鑫,等.红砂岩变形演化及声发射主频特征实验研究[J].煤炭学报,2017,42(S2):362-368. [3] 谭志勇,闵昌万,占续军,等.复合材料结构高温力热试验时的声发射测试技术研究[J].强度与环境,2015,42(5):59-63. [4] 刘砚涛,顾海贝,王鸿博,等.纤维缠绕壳体加载过程中声发射特征研究[J].强度与环境,2016,43(4):36-40. [5] 刘武刚,庞宝君,韩增尧,等.基于声发射的单层铝板高速撞击损伤类型识别[J].宇航学报,2011,32(3):671-675. [6] 王龙,邢睿思,张跃平,等.基于同步辐射X射线成像的力热试验系统[J].强度与环境,2022,49(6):45-50. [7] 冯炎建,冯祖德,李思维,等.C/SiC复合材料微结构的显微CT表征分析[J].航空材料学报,2011,31(2):49-54. [8] 王龙, 刘武刚, 孔凡金, 等. X射线CT在C/SiC复合材料微观结构和损伤表征中的应用[J]. 复合材料科学与工程,2021(6):72-76,112. [9] 黄树华. 岩石力学研究中AE和CT装置的应用——介绍日本京都大学岩石力学研究近况[J]. 岩土力学, 1989,10(1):83-86. [10] 王龙, 冯国林, 李志强, 等. X射线断层扫描在材料力学行为研究中的应用[J]. 强度与环境,2017,44(6):43-56. [11] 丁卫华, 仵彦卿, 蒲毅彬, 等. 低应变率下岩石内部裂纹演化的X射线CT方法[J]. 岩石力学与工程学报, 2003,22(11):1793-1797. [12] CAI Y D, LIU D M, MATHEWS J P, et al. Permeability evolution in fractured coal-combining triaxial confinement with X-ray computed tomography, acoustic emission and ultrasonic techniques[J].InternationalJournal of Coal Geology, 2014,122:91-104.
[13] 陈世杰, 赵淑萍, 邢莉莉, 等. CT扫描参数对岩土图像的影响[J]. CT理论与应用研究,2013,22(2):245- 254. [14] CHEN S J, ZHAO S P, XING L L. Affect of CT scanning parameters to the quality of rock and soil tomograms[J]. Computerized Tomography Theory and Applications, 2013, 22(2):245-254.
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