Investigation of Interlaminar Shear Properties of CFRP Composites at Elevated Temperatures Using the Lempel-Ziv Complexity of Acoustic Emission Signals

被引：9
作者：
Barile, Claudia [1 ]
Casavola, Caterina [1 ]
Pappalettera, Giovanni [1 ]
Kannan, Vimalathithan Paramsamy [1 ]
Renna, Gilda [1 ]
机构：
[1] Politecn Bari, Dipartimento Meccan Matemat & Management, Via Orabona 4, I-70125 Bari, Italy
来源：
MATERIALS | 2022年 / 15卷 / 12期
关键词：
CFRP; high-temperature applications; Short Beam Shear (SBS) Test; interlaminar shear properties; acoustic emission; SEM micrographs; Lempel-Ziv Complexity; frequency analysis; Continuous Wavelet Transform; FAILURE MECHANISMS; IMPACT DAMAGE; RECOGNITION; BEHAVIOR; TRANSFORM; STRENGTH; EXPOSURE;
D O I：
10.3390/ma15124252
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Three-point bending tests on Short Beam Shear (SBS) specimens are performed to investigate the interlaminar shear properties of plain weave fabric CFRP composites. The tests are performed in a controlled environmental chamber at two different elevated temperatures. The interlaminar shear properties of the specimens remain largely unaffected by the testing temperature. However, the SEM micrographs show different damage progressions between the specimens tested at 100 degrees C and 120 degrees C. Fibre ruptures and longer delamination between the plies, as a result of a high temperature, are observed in the specimens tested at 120 degrees C, which are not observed in the specimens tested at 100 degrees C. In addition, the acoustic emission activities during the tests are investigated by using piezoelectric sensors. The information-theoretic parameter, the Lempel-Ziv (LZ) complexity, is calculated for the recorded acoustic signals. The LZ Complexities are used for identifying the occurrence of the first delamination failure in the specimens. Additionally, the two features of the acoustic signals, LZ complexity and Weighted Peak Frequency (W.P-Freq), are used for distinguishing the different damage sources in the CFRP specimens. The results are well-supported by the time-frequency analysis of the acoustic signals using a Continuous Wavelet Transform (CWT).
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页数：23
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