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Different finite element refinement strategies for the computation of the strain energy density in a welded joint
Publikationstyp
Conference Paper
Date Issued
2011
Sprache
English
Author(s)
Start Page
289
End Page
294
Citation
Advances in Marine Structures - Proceedings of the 3rd International Conference on Marine Structures, MARSTRUCT 2011, Hamburg, Germany, 28 - 30 March 2011 (): 289-294 (2011)
Contribution to Conference
Scopus ID
Publisher
CRC Press
Structural failure due to a lack of fatigue strength and crack initiation is often caused by local stress concentrations at welded joints. By decreasing the weld notch radius to small values, the magnitude of stress concentration no longer affects the fatigue strength but a mean value of stress determined around the notch tip. Moreover, in linear elasticity the local stress distribution becomes singular with vanishing radius. Besides the common methods for fatigue assessment, the utilisation of an averaged value of strain energy, computed for a small volume of material, is an alternative approach. The method shows promise with respect to finite element analysis of complex problems. In most of the previous work the quality of the numerical approximation was controlled by mesh refinement. In this paper, alternative refinement techniques are investigated, accounting for the singular behaviour of the exact solution in the vicinity of the re-entrant corner. After the introduction of the concept based on the averaged strain energy density, different refinement strategies improving the quality of the finite element approximation are described and applied to a selected example. The results of the different approaches related to both h and p-refinement are presented and discussed also in view of application to more complex three-dimensional problems. © 2011 Taylor & Francis Group, London.
DDC Class
600: Technik
620: Ingenieurwissenschaften