SEDL / STP / STP833-EB / STP32582S

Application of a Tearing Instability Analysis for Strain-Hardening Materials to a Circumferentially Cracked Pipe in Bending

Pan, J
Mechanics Section, Battelle-Columbus Laboratories, Columbus, Ohio

Ahmad, J
Engineering and Materials Sciences Division, Southwest Research Institute, San Antonio, Tex.

Kanninen, MF
Engineering and Materials Sciences Division, Southwest Research Institute, San Antonio, Tex.

Popelar, CH
The Ohio State University, Columbus, Ohio

Pages: 25    Published: Jan 1984

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Abstract

All previous tearing instability analyses for circumferentially cracked pipes require the use of a limit-load assumption. In this paper a more general approach is developed for power law hardening materials. Specifically, a simple J and (∂J/∂a)^ΔT estimation scheme for a circumferentially cracked pipe subjected to four-point bending is developed using a power hardening law for the plastic part of deformation. The predictions of crack initiation and tearing instability are compared with experimental data. Comparisons with tearing instability predictions using the limit-load approach are also provided.