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Stress intensity factors for long axial surface cracks at the outer wall of a pipe loaded by stress gradients

โœ Scribed by H. Grebner


Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
297 KB
Volume
19
Category
Article
ISSN
0933-5137

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โœฆ Synopsis


By means of the finite element method crack opening displacements were calculated for long axial surface cracks at the outer wall of a pipe. The wall thickness to inner radius ratio of the pipe was 1 to 10. Following a procedure introduced be Mattheck et al. weight functions were evaluated by means of the finite element results. Using these weight functions it is possible to calculate stress intensity factors for arbitrary radially varying stress distributions. In this paper stress intensity factors were evaluated for a constant hoop stress loading as well as for stress distributions with a linear and a quadratic dependence on the radius.

Spannungsintensitktoren fur lange axiale

Oberflachenrisse an der Auaenwand eines durch Spannungsgradienten beanspruchten Rohres Mit Hilfe der Finite-Element-Methode wurden Rihferverschiebungen fur lange axiale Oberflachenrisse an der AuBenwand eines Rohres ermittelt. Das Wandstarke-zu-Innenradius-Verhaltnis des Rohres betrug 1 zu 10. Nach einer von Mattheck et al. eingefuhrten Vorgehensweise wurden mit Hilfe der Finite-Element-Ergebnisse Gewichtsfunktionen bestimmt. Diese erlauben die Berechnung von Spannungsintensitatsfaktoren fiir beliebige radial veranderliche Spannungsverteilungen. In der vorliegenden Arbeit wurden Spannungsintensitatsfaktoren fiir die Falle einer konstanten Umfangsspannung sowie einer linear bzw. quadratisch mit dem Radius veranderlichen Spannungsverteilung ermittelt.


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โœ Dr. H. Grebner ๐Ÿ“‚ Article ๐Ÿ“… 1988 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 427 KB ๐Ÿ‘ 1 views

By means of the weight functions method stress intensity factors were calculated for axial semi-elliptical surface cracks in a pipe with cladding. The component is loaded by a thermoshock. Starting from a stress-free state the inner surface of the cladding is suddenly cooled down. The time-dependent

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## Abstract Stress intensity factors were calculated for partly circumferential surface cracks at the outside of a pipe. The pipe is loaded by internal pressure and by thermal stresses. The weight functions method is used to calculate averaged weighted stress intensity factors at the deepest point