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Keywords
- Alternating plasticity (1)
- Analytischer Zulaessigkeitsnachweis (1)
- Axialbelastung (1)
- Axially cracked pipe (1)
- Deformation (1)
- Design-by-analysis (1)
- Einspiel-Analyse (1)
- Einspiel-Kriterium (1)
- Einspielen <Werkstoff> (1)
- FEM (1)
- Finite-Elemente-Methode (1)
- Global and local collapse (1)
- Grenzwertberechnung (1)
- Limit analysis (1)
- Plastizität (1)
- Pressure loaded crack-face (1)
- Progressive plastic deformation (1)
- Shakedown analysis (1)
- Shakedown criterion (1)
- Traglastanalyse (1)
Institute
- Fachbereich Medizintechnik und Technomathematik (36)
- Fachbereich Luft- und Raumfahrttechnik (21)
- IfB - Institut für Bioengineering (21)
- INB - Institut für Nano- und Biotechnologien (15)
- Fachbereich Elektrotechnik und Informationstechnik (13)
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Limit loads can be calculated with the finite element method (FEM) for any component, defect geometry, and loading. FEM suggests that published long crack limit formulae for axial defects under-estimate the burst pressure for internal surface defects in thick pipes while limit loads are not conservative for deep cracks and for pressure loaded crack-faces. Very deep cracks have a residual strength, which is modelled by a global collapse load. These observations are combined to derive new analytical local and global collapse loads. The global collapse loads are close to FEM limit analyses for all crack dimensions.