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Determination of stress intensity factors along cracked surfaces in piping elbows structures
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Resumo(s)
Pipe elbows play an essential role in pipework systems, once such structure elements are part of the plant process fluid conduction practically in all chemical or energy production industries. High safety standards in design are inherent to these projects due to complex mechanical or thermal loading. When these accessories carry defects, project engineers should assess their integrity in duty. This paper present a contribution in fracture mechanics applied to piping systems. Stress intensity factors are determined along cracked surfaces in piping elbows subjected to bending moment using a developed finite curved pipe element. This element is based in high order polynomial for rigid beam displacement and Fourier series modelling the transverse section warping or ovalization. Computational effort is saved with this element in the evaluation of the stresses or strains. Numerical tests are performed for different pipe elbows with thick or thin flanges, containing a circumferential crack. This study is compared with analyses reported by other authors.
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Contexto Educativo
Citação
Fonseca, E.M.M.; F.J.M.Q. de Melo; R.A.F.Valente. (2006). Determination of stress intensity factors along cracked surfaces in piping elbows structures. In 10th Portuguese Conference on Fracture. Guimarães: Universidade do Minho. ISBN: 972-99596-1-7