Kinetics of Sub-critical Crack Growth in High Strength Materials
The major experimental evidence bearing upon sub-critical crack growth in high strength materials is briefly reviewed. The possibility of crack growth rate control by either reaction rate or diffusion is suggested.
A phenomenological analysis of crack growth rate is given, which incorporates both chemical and mechanical parameters. For elastic systems, a linear relation between the excess chemical potential at the crack tip and the strain energy release rate is demonstrated. For plasticity at the crack tip, an effective chemical driving force is defined in terms of the strain energy release rate and the energy of plastic deformation.
The different crack growth rate behaviors to be expected with interface reaction rate control and diffusion control are developed phenomenologically, and discussed with reference to current experimental data.
KeywordsStress Intensity Factor Crack Growth Rate Fatigue Crack Growth High Strength Steel Maraging Steel
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