Abstract
A simple and flexible method of analysis on stable crack growth in ductile materials is presented. The analysis is based on an elastic-plastic finite element method to calculate the stress and displacement fields in the vicinity of a growing crack under monotonically increasing load. A special type of element known as a “breakable element” and a nodal force relaxation technique have been adopted in a usual elastic-plastic analysis to simulate stable crack growth. A new fracture criterion which is suitable for mixed mode fracture is also used. The computational scheme was verified by excellent correlation with some experimental results.
Résumé
On présente une méthode simple et flexible pour l'analyse de la croissance stable d'une fissure dans les matériaux ductiles. L'analyse est basée sur une méthode par éléments finis élasto-plastiques permettant de calculer les champs de contrainte et de déplacement au voisinage d'une fissure en croissance sous charges monotonique croissante. On a adopté un type spécial d'éléments, dénommé éléments fragmentables, et une technique de relaxation des forces nodales dans une analyse élasto-plastique habituelle, pour simuler la croissance stable d'une fissure. Le nouveau critère de rupture applicable à une rupture de mode mixte a également été utilisée; certains résultats expérimentaux ont permis de vérifier l'excellente corrélation du schéma de calcul proposé.
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Kim, Y.J., Hsu, T.R. A numerical analysis on stable crack growth under increasing load. Int J Fract 20, 17–32 (1982). https://doi.org/10.1007/BF00942162
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DOI: https://doi.org/10.1007/BF00942162