Effect of internal pressure on plastic loads of 90° elbows with circumferential part-through surface cracks under in-plane bending

This paper quantifies the effect of internal pressure on plastic loads for elbows with circumferential through-wall and constant-depth part-through surface cracks under in-plane bending. Results are based on FE limit analyses using elastic–perfectly plastic materials and the non-linear geometry opti...

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Bibliographic Details
Published in:Engineering fracture mechanics 2010-03, Vol.77 (4), p.577-596
Main Authors: Hong, Seok-Pyo, Kim, Jong-Hyun, Kim, Yun-Jae, Budden, P.J.
Format: Article
Language:English
Subjects:
Circumferential crack
Combined pressure and in-plane bending
Elbow
Exact sciences and technology
Finite element limit analysis
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Physics
Plastic load
Solid mechanics
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
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Summary:This paper quantifies the effect of internal pressure on plastic loads for elbows with circumferential through-wall and constant-depth part-through surface cracks under in-plane bending. Results are based on FE limit analyses using elastic–perfectly plastic materials and the non-linear geometry option. It is found that, for larger values of r/ t, the pressure effect on plastic loads is more pronounced and plastic loads for combined loading cases could be much higher than those for pure bending cases. Full FE data of plastic loads are tabulated, and effects of crack geometries on interaction curves are discussed.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2009.11.013