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An Empirical Model for Environmental Damage at the Crack Tip

Published online by Cambridge University Press:  21 February 2011

K. -M. Chang
K. -M. Chang*
Affiliation:
General Electric Company, Corporate Research and Development, P.O. Box 8, Schenectady, NY 12301
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Abstract

An experimental method that is able to verify and to characterize the damage zone developed in front of crack tip under time-dependent fatigue crack propagation has been established. The crack growth rate was found to decrease exponentially in the damaged zone. Such a crack growth behavior can be described by a mathematical model which only requires three parameters: initial crack growth rate, (da/dN)q; normal crack growth rate (da/dN)o; and damaged zone size, D. An analyticat relationship has been developed to correlate the temperature and the time of sustained loading to the size of the induced damaged zone.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 125: Symposium N – Materials Stability and Environmental Degradation , 1988 , 243
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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