PSI - Issue 58

K N Pandey et al. / Procedia Structural Integrity 58 (2024) 122–129 K. N. Pandey and G. Singh / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 8. (a) da/dN versus shift in RF for different loading; (b) da/dN versus Δ K.

4. Conclusions It can be concluded that the shift in resonant frequency represents the damage under both constant amplitude and block loading conditions. It represented the behaviour of the crack growth very much similar to the conventional range of stress intensity factor. Therefore, EMI technique can provide the information about the damage under both high low and low high loading conditions. References Abe, M., Park, G., Inman, D. J., 2002. Impedance-based monitoring of stress in thin structural members, Proceeding of 11th International Conference on Adaptive Structures and Technologies. Nagoya, Japan, ISSN No. 1068-0578. Ayres, J. W., Lalande, F., Chaudhry, Z., Rogers, C. A., 1998. Qualitative impedance-based health monitoring of civil infrastructures. Smart Materials and Structures 7(5), 599-605. Bhalla, S., Soh, C.K, 2004. Structural Health Monitoring by Piezo-impedance Transducers: II Applications. Journal of Aerospace Engineering, ASCE 17(4), 166-175. Borrego, L.P., Ferreira, J. M., Costa, J. M., 2008. Partial crack closure under block loading, International Journal of Fatigue 30, 1787–1796. Carvalho, A.L.M., Martins, J.P., Voorwald, H.J.C., 2009. Fatigue damage accumulation in aluminum 7050-T7451 alloy subjected to block programs loading under step-down sequence. Procedia Engineering 2, 2037-2043. Lim, Y.Y., Soh, C.K., 2010. Estimation of fatigue life using electromechanical impedance technique, Proceedings of SPIE - The International Society for Optical Engineering. San Diego, California, United States, https://doi.org/10.1117/12.846902. Lim, Y.Y., Soh, C.K., 2011. Fatigue life estimation of a 1D aluminum beam under mode-I loading using the electromechanical impedance technique. Smart Materials and Structures 20, doi 10.1088/0964-1726/20/12/125001. Lim, Y.Y., Soh, C.K., 2014. Electro-Mechanical Impedance (EMI)-Based Incipient Crack Monitoring and Critical Crack Identification of Beam Structures. Research in Nondestructive Evaluation 25, 82–98. Lopes, V., Park, G., Cudney,, H. H., Inman D. J., 1999. Smart structures health monitoring using artificial neural network, Proceedings of 2nd International Workshop on Structural Health Monitoring. Stanford University, Stanford. USA, ISBN: 1-56676-881-0. Maruo, I.I.C., Giachero, G.F., Júnior, V.S., Neto, R.M.F., 2015. Electromechanical Impedance – Based Structural Health Monitoring Instrumentation System Applied to Aircraft Structures and Employing a Multiplexed Sensor Array. Journal Aerospace Technology Management 7(3), 294-306. Palomino, L.V., et al., 2011. Impedance-based health monitoring and mechanical testing of structures, Smart Structures and Systems 7, 15-25. Park, S., Yun, C.B., Roh,Y. Lee, J.J., 2006. PZT-based Active Damage Detection Techniques for Steel Bridge Components. Smart Materials and Structures 15, 1734-1746. Shukla, R.K., Singh G., Pandey, K.N., 2022. Application of EMI Technique in Crack Propagation under the Block Loading Conditions, 20th ISME Conference on Advances in Mechanical Engineering. Ropar, India, 7909. Soh, C.K., Tseng, K.K.H., Bhalla, S., Gupta, A., 2000. Performance of smart piezoceramic patches in health monitoring of a RC bridge. Smart Materials and Structures 11(4), 246-257.