Development of methods to observe fatigue damage through surface characteristics

Jody L. Schroeder; Eric B. Shell; Theodore E. Matikas; Daniel Eylon

doi:10.1117/12.339839

8 February 1999 Development of methods to observe fatigue damage through surface characteristics

Jody L. Schroeder, Eric B. Shell, Theodore E. Matikas, Daniel Eylon

Proceedings Volume 3585, Nondestructive Evaluation of Aging Materials and Composites III; (1999) https://doi.org/10.1117/12.339839
Event: Nondestructive Evaluation Techniques for Aging Infrastructures and Manufacturing, 1999, Newport Beach, CA, United States

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.

Citation Download Citation

Jody L. Schroeder, Eric B. Shell, Theodore E. Matikas, and Daniel Eylon "Development of methods to observe fatigue damage through surface characteristics", Proc. SPIE 3585, Nondestructive Evaluation of Aging Materials and Composites III, (8 February 1999); https://doi.org/10.1117/12.339839

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