Lamb-wave propagation characteristics and damage imaging in additively manufactured plates

Mohammad Ali Fakih; Shishir Kumar Singh; Pawel Malinowski

doi:10.1117/12.2612837

19 April 2022 Lamb-wave propagation characteristics and damage imaging in additively manufactured plates

Mohammad Ali Fakih, Shishir Kumar Singh, Pawel Malinowski

Proceedings Volume 12048, Health Monitoring of Structural and Biological Systems XVI; 120480O (2022) https://doi.org/10.1117/12.2612837
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States

Abstract

Lightweight complex-shaped parts are imposing themselves as inevitable in modern industry. This has induced the improvement of additive manufacturing (AM) processes and, hence, their transformation from the prototyping state into real industrial production. Such a transformation necessitates the establishment of reliable structural health monitoring (SHM) techniques for AM structures, to ensure their safe use and extend their lifetime. Research contributions over the last few decades have shown a significant potential of ultrasonic Lamb waves (LWs) for SHM of both metallic and composite structures, thanks to their favorable propagation characteristics and sensitivity to various types of structural damage. The current work investigates the propagation characteristics of LWs and examines their potential for damage imaging and localization in AM structures. To this end, pristine and damaged plates were manufactured using different materials and printing techniques/layouts. LWs of a range of typical central frequencies (50, 100, and 150 kHz) were excited at the surface of the plates using PZT and MFC transducers. Area scans were performed, using a scanning laser vibrometer, to receive the propagating waves. The influence of printing patterns on the propagation velocities of the fundamental LW modes was scrutinized, as compared to the theoretical velocities in the printing materials, assumed uniform and isotropic. Further, various damage imaging techniques were explored to detect and localize damage in the AM plates. The obtained results are considered an important step towards the application of LW-based techniques for SHM of additively manufactured structures.

Conference Presentation

Citation Download Citation

Mohammad Ali Fakih, Shishir Kumar Singh, and Pawel Malinowski "Lamb-wave propagation characteristics and damage imaging in additively manufactured plates", Proc. SPIE 12048, Health Monitoring of Structural and Biological Systems XVI, 120480O (19 April 2022); https://doi.org/10.1117/12.2612837

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