CHARACTERIZATION OF MATERIAL PROPERTIES OF MULTI-LAYERED FIBER REINFORCED COMPOSITE STRUCTURES USING INVERSE ULTRASONIC METHODS
Krishnan Balasubramaniam, Nain S. Rao and Yuyin Ji Department of Aerospace Engineering and Mechanics Mail Stop 9549, Mississippi State University, MS 39762, USA
Keywords: Ultrasonic NDE, Composites, material Characterisation, inverse problem, NDT
ABSTRACT
In this paper, efforts on the acoustical measurements of material properties of multi-layered fiber reinforced composites such as granite epoxy using oblique incidence techniques will be discussed. Both, direct as well as inverse methods were used in this effort. The reflection factor spectrum plots were used to study the effect of the material properties as a function of frequency angle of incidence as well as azimuthal angles. Optimal parameters were chosen from the direct approach. Then, inversion algorithms will be introduced to compute the material properties from the experimental data. Sensitivity as well as accuracy of the techniques will also be presented.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.Vol. 2, pages 733 - 738 Publisher:Ashgate Publishing Company
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