Article,

Subcritical crack growth: The microscopic origin of Paris' law

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PHYSICAL REVIEW LETTERS, (2008)
DOI: 10.1103/PhysRevLett.100.195503

Abstract

We investigate the origin of Paris' law, which states that the velocity of a crack at subcritical load grows like a power law, da/dt similar to(Delta K)(m), where Delta K is the stress-intensity-factor amplitude. Starting from a damage-accumulation function proportional to (Delta sigma)(gamma), Delta sigma being the stress amplitude, we show analytically that the asymptotic exponent m can be expressed as a piecewise-linear function of the exponent gamma, namely

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