Characterization of discretely graded materials using acoustic wave propagation

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• 作者：Ritesh Samadhiya ; Abhijit Mukherjee and Siegfried Schmauder
• 关键词：Functionally graded materials ; Wave mechanics ; Spectral method ; Peak stresses ; Time delay
• 刊名：Computational Materials Science
• 出版年：2006
• 出版时间：August 2006
• 年：2006
• 卷：37
• 期：1-2
• 页码：20-28
• 全文大小：369 K

文摘

Functionally graded materials (FGMs) have great potential as energy absorbing devices, electrical transducers, thermal barriers, etc. Study of the propagation of elastic waves is imperative for a number of such applications. In this paper, a simple one-dimensional model is proposed to study the stress waves in discretely graded media. The model uses spectral approach to determine the stresses due to the incident and reflected waves in FGMs. It has been observed that FGMs attenuate and delay the peak stresses considerably as compared to composites with sharp interfaces. Performance of different number of inner layers on the reflected wave characteristics has been discussed. Stress time history profiles are also presented for Alumina–Aluminum FGMs that are used in armor applications.