PSI - Issue 8

A. De Luca et al. / Procedia Structural Integrity 8 (2018) 288–296 A. De Luca/ Structural Integrity Procedia 00 (2017) 000 – 000

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Fig. 6 Sensor 3 receiving signal compared with the baseline signal: (a) 5J damage configuration; (b) 15 J damage configuration.

Fig. 7 Fig. Sensor 4 receiving signal compared with the baseline signal: (a) 5J damage configuration; (b) 15 J damage configuration.

According to Fig. 6.b, sensor 3 is the most affected by the damages. Moreover, it can be noticed that there is a slight delay involving the first waves packet respect to the baseline signal. Hence, the damage reduces the group velocity of the Lamb waves if placed between the actuator and the receiving sensor. The same assertion cannot be made for the other sensors. For the other sensors differences in the signals amplitudes can be noticed.

4. Conclusions

In conclusion, a FE procedure has been developed in order to simulate the Lamb wave propagation in a LVI damaged plate. The procedure allows simulating the wave propagation in a plate previously impacted providing a better simulation of the interaction between Lamb waves and damages. The same procedure can be used to investigate the wave propagation under different LVI damages configurations. At the moment the prediction model has been established only for pristine plate. Further future developments will be addressed also to the assessment of the prediction model capability for damaged plate.

References

Ben, B. S., Ben, B. A., Vikram, K. A., Yang, S. H., 2013. Damage identification in composite materials using ultrasonic based Lamb wave method. Measurement 46, 904 – 12. Caputo, F., Lamanna, G., Soprano, A., 2012. Effects of tolerances on the structural behavior of a bolted hybrid joint. Key Engineering Materials 488 489, 565-568. De Luca, A., Sharif-Khodaei, Z., Aliabadi, M.H., Caputo, F., 2016. Numerical Simulation of Lamb Wave Propagation in Impacted CFRP. Procedia Engineering 167, 109-115. De Luca, A., Sharif-Khodaei, Z., Caputo, F., 2016. Determination of the impact location and damage characterization based on guided waves. Key Engineering Materials 713, 10-13. Diamanti, K., Soutis, C., Hodgkinson, J. M., 2005. Lamb waves for the non-destructive inspection of monolithic and sandwich composite beams. Composite Part A: Applied Science and Manufacturing 36, 189 – 95.