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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