On the anisotropic attenuation behavior of the flexure mode of carbon fiber composites

Published

July 28, 2013

Author(s)

Brian M. Burks, Marvin A. Hamstad

Abstract

In this work a coupled experimental-numerical approach was developed to study the anisotropic far field attenuation behavior of plate-type unidirectional carbon fiber composites. Experimentally a technique that utilizes a time-frequency analysis to determine the frequency specific far field attenuation coefficient was developed, and used to evaluate the frequency specific attenuation coefficient of the flexure mode for both principal in-plane propagation directions. Numerically a technique for tuning finite element models to match the experimentally measured anisotropic attenuation behavior via incorporating Rayleigh damping into the models was developed. The ability of numeric models to realistically capture the far-field attenuation behavior leads to the possibility of using simulation to perform probability of detection studies for a given flaw/damage type. The numeric tuning technique was found to work well over a narrow bandwidth of interest (e.g., windowed ultrasonic signals), but was not robust enough to consider broadband sources (e.g., acoustic emissions).

Proceedings Title

19th International Conference on Composite Materials

Conference Dates

July 28-August 1, 2013

Conference Location

Montreal

Pub Type

Conferences

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Keywords

attenuation, stress wave propagation, FEM, flexure mode, time-frequency analysis

Citation

Burks, B. and Hamstad, M. (2013), On the anisotropic attenuation behavior of the flexure mode of carbon fiber composites, 19th International Conference on Composite Materials, Montreal, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=913662 (Accessed December 25, 2024)