Abstract
The present study investigated the effect of restraint of pressure induced bending (PIB) on the elastic–plastic crack opening behaviour of a circumferential through-wall crack in a pipe. Elastic and elastic–plastic finite element analyses were performed to estimate the crack opening displacement (COD) for various restraint conditions and circumferential crack angles. The results showed that the restraint of PIB decreased the crack opening at a specific crack angle and magnitude of internal pressure, and the decrease in crack opening was considerable for larger crack angles with short restraint length. Also, the restraint effect was more significant in elastic–plastic analysis than linear elastic analysis. In the elastic–plastic analysis, the increasing internal pressure enhanced the restraint effect of PIB, and its effect was dependent on the circumferential crack angle. Additionally, it was observed that the restraint effect on COD is governed by the shorter restraint length rather than the overall restraint length when a cracked pipe is restrained non-symmetrically.
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