Mechanical Properties of Thin-Ply Composites Based on Acoustic Emission Technology
Abstract
:1. Introduction
2. Materials and Methods
2.1. Test Specimen Preparation
2.2. Test Methods
2.3. Microstructural Analysis
3. Results
3.1. Damage Mode Identification
3.2. Characteristics of Acoustic Emission Signals
3.2.1. Acoustic Amplitude and Accumulation Release Energy–Time Relationship
3.2.2. Acoustic Emission Accumulation Counts Analysis
3.3. Strength Analysis
3.4. Fracture Mode Analysis
4. Conclusions
- (1)
- The characteristic frequency ranges for MID, MF, and FF were identified as 0–85 kHz, 165–260 kHz, and 261–304 kHz, respectively. Based on the characteristic frequencies, it was proposed that the initial damage signal of the fiber could be regarded as the basis of an obvious damage initiation calibration, for the reason that there was a certain correlation with the determination of the first effective damage signal.
- (2)
- For (02[[90m/0m]ns]02) laminates, the thickness of identical plies has a significant effect on the onset damage. When the number of identical plies (i.e., m in the stacking sequence) was the minimum, the time of the first effective onset damages signal came last. This indicated that thin-ply composites could exhibit initiation damage suppression effects and crack propagation resistance.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Groups | Layups | Thickness (mm) | Length (mm) | Width (mm) |
---|---|---|---|---|
A | 02[[90/0]16s]02 | 2.6 | 250 | 25 |
B | 02 [[902/02]8s]02 | 2.6 | 250 | 25 |
C | 02 [[904/04]4s]02 | 2.6 | 250 | 25 |
D | 02 [[908/08]2s]02 | 2.6 | 250 | 25 |
E | [90] 68 | 2.6 | 250 | 25 |
F | [0] 68 | 2.6 | 250 | 25 |
Channel Threshold [25] | Acquisition Frequency | Center Frequency | Acquisition Point |
---|---|---|---|
52 dB | 2 MHz | 255 kHz | 2048 |
Damage Modes | MID | MF | FF |
---|---|---|---|
Frequency range/kHz | 0–85 | 240–260 | 261–304 |
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Zheng, K.; Cao, D.; Hu, H.; Ji, Y.; Li, S. Mechanical Properties of Thin-Ply Composites Based on Acoustic Emission Technology. Materials 2021, 14, 913. https://doi.org/10.3390/ma14040913
Zheng K, Cao D, Hu H, Ji Y, Li S. Mechanical Properties of Thin-Ply Composites Based on Acoustic Emission Technology. Materials. 2021; 14(4):913. https://doi.org/10.3390/ma14040913
Chicago/Turabian StyleZheng, Kaidong, Dongfeng Cao, Haixiao Hu, Yundong Ji, and Shuxin Li. 2021. "Mechanical Properties of Thin-Ply Composites Based on Acoustic Emission Technology" Materials 14, no. 4: 913. https://doi.org/10.3390/ma14040913