252
G. Bai et al.
21.5 Conclusion
The following conclusions are noted:
1. The dual variable voting method and clustering analysis are highly suitable for
C/SiC CMC high temperature creep AE signal analysis, and K-means clustering
is available in most samples and the optimal cluster classification is three.
2. There are three basic damage mechanisms of C/SiC composite samples in high
temperature creep: fiber breakage, matrix cracking, and fiber/matrix interface
debonding. They have significant differences in peak frequency, frequency band
2, and frequency band 4. It means that the AE signal is mainly related to the
material damage mechanisms in the frequency domain.
3. The high temperature creep life of C/SiC composites mainly depends on the
interface bonding strength, the samples with more interface damage have longer
fiber extraction length, larger damage tolerance, and can obtain larger creep life.
Acknowledgements This work has been financially supported by the National Key Research and
Development Project of China (2016YFB0700503) and the National Natural Science Foundation
of China (51772244 and 11072195).
References
1. T. Li, D. Fan, L. Lu, J.Y. Huang, J. C.E.F.Zhao, et al. Dynamic fracture of c/sic composites
under high strain-rate loading: microstructures and mechanisms. Carbon 91, 468–478 (2015)
2. Y. Yang, Xu. Fei, X. Gao, G. Liu, Impact resistance of 2D plain-woven C/SiC composites at
high temperature. Mater. Des. 90, 635–641 (2016)
3. X. Luan, L. Cheng, C. Xie, Stressed oxidation life predication of 3D C/SiC composites in a
combustion wind tunnel. Compos. Sci. Technol. 88, 178–183 (2013)
4. H. Mei, L. Cheng, L. Zhang, Damage mechanisms of C/SiC composites subjected to constant
load and thermal cycling in oxidizing atmosphere. Scripta Mater. 54(2), 163–168 (2006)
5. S.Qiao, S. Du, G. Ji, D. Han, W. Li, Damage mechanism of 3D-C/SiC composite. J. Mech.
Strength 26(3) (2004)
6. 乔生儒, 杜双明, 纪岗昌, 韩栋, 李玫, “3D-C/SiC复合材料的损伤机理,” 机械强度, 26(3)
(2004)
7. van Roode M, Ceramic gas turbine development: need for a 10 year plan. J. Eng. Gas Turbines
Power132(1), 011301 (2010)
8. S. Pimenta, S.T. Pinho, Recycling carbon fibre reinforced polymers for structural applications:
Technology review and market outlook. Waste Manage. 31(2), 378–392 (2011)
9. T. Li, J. Mo, Yu. Xia, T. Suo, Y. Li, Mechanical behavior of C/SiC composites under hypervelocity impact at different temperatures: Micro-structures, damage and mechanisms. Compos.
A Appl. Sci. Manuf. 88, 19–26 (2016)
10. L. Salvo, M. Suéry, A. Marmottant, N. Limodin, D. Bernard, 3D imaging in material science:
application of X-ray tomography. C R Phys. 11(9–10), 641–649 (2010)
11. D. Frazer, M.D. Abad, D. Krumwiede, C.A. Back, H.E. Khalifa, C.P. Deck, P. Hosemann,
Localized mechanical property assessment of SiC/SiC composite materials. Compos. A Appl.
Sci. Manuf. 70, 93–101 (2015)
G. Bai et al.
21.5 Conclusion
The following conclusions are noted:
1. The dual variable voting method and clustering analysis are highly suitable for
C/SiC CMC high temperature creep AE signal analysis, and K-means clustering
is available in most samples and the optimal cluster classification is three.
2. There are three basic damage mechanisms of C/SiC composite samples in high
temperature creep: fiber breakage, matrix cracking, and fiber/matrix interface
debonding. They have significant differences in peak frequency, frequency band
2, and frequency band 4. It means that the AE signal is mainly related to the
material damage mechanisms in the frequency domain.
3. The high temperature creep life of C/SiC composites mainly depends on the
interface bonding strength, the samples with more interface damage have longer
fiber extraction length, larger damage tolerance, and can obtain larger creep life.
Acknowledgements This work has been financially supported by the National Key Research and
Development Project of China (2016YFB0700503) and the National Natural Science Foundation
of China (51772244 and 11072195).
References
1. T. Li, D. Fan, L. Lu, J.Y. Huang, J. C.E.F.Zhao, et al. Dynamic fracture of c/sic composites
under high strain-rate loading: microstructures and mechanisms. Carbon 91, 468–478 (2015)
2. Y. Yang, Xu. Fei, X. Gao, G. Liu, Impact resistance of 2D plain-woven C/SiC composites at
high temperature. Mater. Des. 90, 635–641 (2016)
3. X. Luan, L. Cheng, C. Xie, Stressed oxidation life predication of 3D C/SiC composites in a
combustion wind tunnel. Compos. Sci. Technol. 88, 178–183 (2013)
4. H. Mei, L. Cheng, L. Zhang, Damage mechanisms of C/SiC composites subjected to constant
load and thermal cycling in oxidizing atmosphere. Scripta Mater. 54(2), 163–168 (2006)
5. S.Qiao, S. Du, G. Ji, D. Han, W. Li, Damage mechanism of 3D-C/SiC composite. J. Mech.
Strength 26(3) (2004)
6. 乔生儒, 杜双明, 纪岗昌, 韩栋, 李玫, “3D-C/SiC复合材料的损伤机理,” 机械强度, 26(3)
(2004)
7. van Roode M, Ceramic gas turbine development: need for a 10 year plan. J. Eng. Gas Turbines
Power132(1), 011301 (2010)
8. S. Pimenta, S.T. Pinho, Recycling carbon fibre reinforced polymers for structural applications:
Technology review and market outlook. Waste Manage. 31(2), 378–392 (2011)
9. T. Li, J. Mo, Yu. Xia, T. Suo, Y. Li, Mechanical behavior of C/SiC composites under hypervelocity impact at different temperatures: Micro-structures, damage and mechanisms. Compos.
A Appl. Sci. Manuf. 88, 19–26 (2016)
10. L. Salvo, M. Suéry, A. Marmottant, N. Limodin, D. Bernard, 3D imaging in material science:
application of X-ray tomography. C R Phys. 11(9–10), 641–649 (2010)
11. D. Frazer, M.D. Abad, D. Krumwiede, C.A. Back, H.E. Khalifa, C.P. Deck, P. Hosemann,
Localized mechanical property assessment of SiC/SiC composite materials. Compos. A Appl.
Sci. Manuf. 70, 93–101 (2015)