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Development of Nondestructive Method for Prediction of Crack Instability

Published online by Cambridge University Press:  10 February 2011

J. L. Schroeder ,
D. Eylon ,
E. B. Shell  and
T. E. Matikas
J. L. Schroeder
Affiliation:
Center for Materials Diagnostics, University of Dayton, Dayton OH 45469-0121
D. Eylon
Affiliation:
Graduate Materials Engineering, University of Dayton, Dayton OH 45469-0240
E. B. Shell
Affiliation:
Center for Materials Diagnostics, University of Dayton, Dayton OH 45469-0121
T. E. Matikas
Affiliation:
Former Director of the Center for Materials Diagnostics, University of Dayton
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Abstract

A method to characterize the deformation zone at a crack tip and predict upcoming fracture under load using white light interference microscopy was developed and studied. Cracks were initiated in notched Ti-6A1-4V specimens through fatigue loading. Following crack initiation, specimens were subjected to static loading during in-situ observation of the deformation area ahead of the crack. Nondestructive in-situ observations were performed using white light interference microscopy. Profilometer measurements quantified the area, volume, and shape of the deformation ahead of the crack front. Results showed an exponential relationship between the area and volume of deformation and the stress intensity factor of the cracked alloy. These findings also indicate that it is possible to determine a critical rate of change in deformation versus the stress intensity factor that can predict oncoming catastrophic failure. In addition, crack front deformation zones were measured as a function of time under sustained load, and crack tip deformation zone enlargement over time was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 591 , 1999 , 61
Copyright
Copyright © Materials Research Society 2000

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References

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