Singapore Institute of Technology

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Metal-Polymer Functionally Graded Materials for Removing Guided Wave Reflections at Beam End Boundaries

conference contribution
posted on 2023-07-07, 14:14 authored by Chin Kian LiewChin Kian Liew, M. Veidt, D.T. Chavara, A.J. Ruys, C. Young, M. McCreery

This paper investigates the potential of a metal-polymer functionally graded material (FGM) to remove beam end boundary wave reflections that produce complicated interference patterns in the response signals used for guided wave damage identification methodologies. The metal-polymer FGM matches the material properties to a metal beam for total wave transmission on one side and is continuously graded to a viscoelastic polymer on the other side. An Aluminium-Polycarbonate (AI-PC) FGM was fabricated and characterised using microscopy, hardness testing and through-transmission ultrasonics to verify the continuous gradient. Measurements of guided waves on an aluminium beam attached to the FGM on one end show reduction in boundary wave reflections that varies with wave frequency. A damaged aluminium beam attached with the FGM produced promising improvements in a damage identification system. 


Journal/Conference/Book title

5th Australasian Congress on Applied Mechanics (ACAM 2007), 10-12 December 2007, Brisbane, Australia

Publication date