Chen Long, Liu Xing, Zhan Chao, Li Yang. Measurement of Elastic Constants of Metal Foils by Laser Ultrasonic Method[J]. Chinese Journal of Lasers, 2020, 47(11): 1104003
- Chinese Journal of Lasers
- Vol. 47, Issue 11, 1104003 (2020)
Fig. 1. Lamb wave dispersion curves in 20 μm thick Mg-Li alloy. (a) Phase speed; (b) group speed
Fig. 2. Calculation flow chart of mixed calculation method
Fig. 3. Schematic of finite element model of laser ultrasonic
Fig. 4. Time-domain curve and spectrum of ultrasonic wave received at 12.1 mm from surface to loading center. (a) Time-domain curve of ultrasonic wave; (b) spectrum of S0 mode
Fig. 5. B sweep diagram of Lamb wave in Mg-Li alloy foil
Fig. 6. Results of two-dimensional Fourier transform. (a) S0 mode; (b) A0 mode
Fig. 7. Time-domain waveforms for S0 original data or after band-pass filtering at different points
Fig. 8. Schematic of excitation point and measurement points on aluminum foil
Fig. 9. Signals received at 5 mm away from excitation point. (a) Time-domain curve of ultrasonic wave; (b) one-dimensional Fourier transformation curve of S0
Fig. 10. Time-domain signal received at 5 mm and 10 mm from excitation point and signal delay. (a) Time-domain signals; (b) delay time
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Table 1. Material parameters
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Table 2. Group speeds of S0 and A0 modes in Mg-Li alloy foils under different Poisson's ratios when elastic modulus is 40 GPa
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Table 3. Phase speeds of Lamb wave S0 modes at different frequencies
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Table 4. Parameters obtained by simulation
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Table 5. Calculated material parameters and errors
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