Xianglin Zhan, Shuwen Li. Evaluation Method of Micro-Debonding Defects in FMLs Based on Local Defect Resonance[J]. Laser & Optoelectronics Progress, 2021, 58(23): 2316001
- Laser & Optoelectronics Progress
- Vol. 58, Issue 23, 2316001 (2021)
Fig. 1. Nonlinear spring oscillator model
Fig. 2. Sweep signal
Fig. 3. Sweep result
Fig. 4. Results of excitation at LDR frequency
Fig. 5. Results of excitation far away from LDR frequency
Fig. 6. Results of excitation at 2 times LDR frequency
Fig. 7. Detection experiment. (a) Detection circuit; (b) specimen to be tested
Fig. 8. Excitation results of specimen 6 at LDR frequency
Fig. 9. Excitation results of specimen 6 far away from LDR frequency
Fig. 10. Excitation results of specimen 6 at 2 times LDR frequency
Fig. 11. Amplitude of each component in echo response (excitation frequency is 40 kHz and excitation voltage is 1-90 V)
Fig. 12. Amplitude of each component in echo response (excitation frequency is 31.5 kHz and excitation voltage is 1-90 V)
Fig. 13. Comparison of preset and estimated damage equivalent radius of each group of specimens
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Table 1. LDR frequency of each specimen with different damage sizes
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Table 2. Simulated and experimental results under different detection conditions
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Table 3. Preset and estimated damage equivalent radius of each group of specimens
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