A fatigue test has been carried out at room temperature in air on a carbon steel pipe which has a crack on its outer surface.Special attention was paid to crack growth rate,crack shape,fatigue life and crack opening displacement.A new equation was proposed for evaluating K after crack penetration.The main results obtained in this study were as follows: (1) before crack penetration,crack growth behaviour such as aspect ratio and leak life were evaluated using Newman-Raju's equation and proposed plate model; (2) after crack penetration,crack growth behaviour such as crack shape,fatigue life and crack opening displacement were evaluated using the equation and pipe model proposed in this paper.
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