Nondestructively monitoring fatigue damage in fiber reinforced composites using acoustic microscopy

A. C. Wey, L. W. Kessler, Henrique M Reis

Research output: Contribution to journalArticle

Abstract

Both SLAM (scanning laser acoustic microscopy) and C-SAM (C-scan mode scanning acoustic microscopy) imaging have been employed to nondestructively monitor the damage development in ceramic composites with LAS (lithium-alumino-silicate) glass matrix reinforced with silicon carbide (NICALON) fibers. To evaluate high-temperature fatigue damage in these ceramic composites 10 MHz SLAM images were produced. The results of reserve strength test obtained during four-point bending static tests where the load was monotonically increased until failure occurred correlated with the prediction made based on SLAM image. SLAM enables one to 'see' the geometrical distribution of all kinds of damage in specimens and helps one understand the collective effect of various damages on the variations in mechanical performance. In addition, C-SAM was used to produce the 3-D distribution of the damage, allowing the differentiation between compressive and tensile damage in the four-point-bending fatigued specimens.

Original languageEnglish (US)
Pages (from-to)953-956
Number of pages4
JournalUltrasonics Symposium Proceedings
Volume2
StatePublished - 1990
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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