Chapter 40. Damage Characterization of a Si3N4-BN Fibrous Monolith Using NDE Techniques

  1. Ersan Ustundag and
  2. Gary Fischman
  1. J. L. Finch1,
  2. J. M. Staehler1,
  3. L. P. Zawada1,
  4. W. A. Ellingson2,
  5. J. G. Sun2 and
  6. C. M. Deemer2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294567.ch40

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3

23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3

How to Cite

Finch, J. L., Staehler, J. M., Zawada, L. P., Ellingson, W. A., Sun, J. G. and Deemer, C. M. (2008) Damage Characterization of a Si3N4-BN Fibrous Monolith Using NDE Techniques, in 23rd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures : A: Ceramic Engineering and Science Proceedings, Volume 20, Issue 3 (eds E. Ustundag and G. Fischman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294567.ch40

Author Information

  1. 1

    Materials & Manufacturing Directorate, AFRL/MLLN, WPAFB, OH 45433–7817

  2. 2

    Argonne National Laboratory, Argonne, IL 60439

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1999

ISBN Information

Print ISBN: 9780470375631

Online ISBN: 9780470294567

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Keywords:

  • utilized;
  • thermography;
  • C-scan images;
  • coextrusion;
  • delamination

Summary

A variety of nondestructive evaluation techniques were utilized to document the damage characteristics of a Si3N4-BN fibrous monolith. The techniques included X-ray radiography, infrared thermography, ultrasonic C-scanning, and acoustic emission detection. The focus of this paper is the nondestructive evaluation results from a modified single-edge notched tensile specimen inspected before and after testing. Of the techniques performed, the thermography and ultrasonic methods were the most successful at identifying the predominant types of damage incurred in the fibrous monolith material. Polished cross-sections of the specimen revealed that hairline cracks had developed along inter- and intra-laminar BN cell bundle boundaries. Neither type of crack could be identified from the X-ray radiograph. The delaminated zones were matched with results from the thermography and C-scans. The acoustic emissions correlated well with changes in the load-displacement data and provided source locations consistent with the thermal and C-scan images.