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Proceedings Paper

Development of methods to observe fatigue damage through surface characteristics
Author(s): Jody L. Schroeder; Eric B. Shell; Theodore E. Matikas; Daniel Eylon
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Paper Abstract

The objective of this work is to develop a methodology for predicting material failure by evaluating changes in material characteristics directly prior to unstable crack growth. In an effort to establish and document these changes, several Ti-6Al-4V flat, notched samples have been subjected to fatigue loading to partial life. After a fatigue crack was initiated characterization was performed during in-situ application of an incrementally increased static load. White light interference microscopy was found to be a successful nondestructive tool for characterizing changes in the deformation zone in front of the crack tip. A relationship between the applied load and the surface area of the deformation zone was obtained. This relationship was exponential directly prior to failure of the specimen. Surface observations during in-situ testing allowed samples to be brought near to failure without compete fracture. This result can have important applications for optimizing the service life of airframe structural components.

Paper Details

Date Published: 8 February 1999
PDF: 8 pages
Proc. SPIE 3585, Nondestructive Evaluation of Aging Materials and Composites III, (8 February 1999); doi: 10.1117/12.339839
Show Author Affiliations
Jody L. Schroeder, Univ. of Dayton (United States)
Eric B. Shell, Univ. of Dayton (United States)
Theodore E. Matikas, Univ. of Dayton (United States)
Daniel Eylon, Univ. of Dayton (United States)


Published in SPIE Proceedings Vol. 3585:
Nondestructive Evaluation of Aging Materials and Composites III
George Y. Baaklini; Carol A. Nove; Eric S. Boltz, Editor(s)

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