ULTRASONIC ATTENUATION IN CARBON-CARBON COMPOSITES AND THE DETERMINATION OF POROSITY.

B. R. Tittmann, B. Hosten, M. Abdel-Gawad

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

Ultrasonic spectroscopy together with optical microscopy were used to study the distribution of porosity in two-dimensional carbon-carbon composites. In the frequency-dependent (0. 5-3. 0 MHz) attenuation, characteristic features are found which lead to separate estimates of mean size and volume fraction of pores. Four samples of two-dimensional carbon-carbon composites were studied, corresponding to each of four key steps in the fabrication process. A method was developed to analyze the data. A correlation between the degree of porosity and ultrasonic attenuation was found in qualitative agreement with theory. The absence of quantitative agreement is thought to be a result of nonideal (nonspherical) geometry of the pores.

Original languageEnglish (US)
Pages (from-to)1047-1050
Number of pages4
JournalUltrasonics Symposium Proceedings
StatePublished - Dec 1 1986

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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