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Plastic collapse stresses for thick wall pipes with external cracks

Hasegawa, Kunio; Li, Y. ; Lacroix, V.*; Mare$v{s}$, V.*

Bending stress at plastic collapse for a circumstantially cracked pipe is predicted by limit load equation provided by the Appendix C of the ASME Code Section XI. The equation of the Appendix C is applicable for pipes with both external and internal surface cracks. On the other hand, authors had developed an equation taking into account the pipe mean radii at non-cracked area and at cracked ligament area. From the comparison of Appendix C equation and the new equation, the plastic collapse stress estimated by the Appendix C equation gives 20 to 30% less conservative for external cracked pipes with small $$R_{m}/t$$, where $$R_{m}$$ is the pipe mean radius and t is the pipe wall thickness. This paper discusses the limitation of the use of $$R_{m}/t$$ for the Appendix C equation.



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