An Engineering Framework to Account for Crack Tip Constraints
Berücksichtigung der Constraint effekte in der technischen Bruchmechanik Ein anwendungsorientiertes Konzept
H. J. Schindler
ABSTRACT Stress concentration and inhomogeneous plastic deformation in the vicinity of a crack tip cause locally a triaxial stress state. At present time, several parameters are known to characterize these so called crack tip constraints. However, the determination of these parameters requires rather detailed FEM models, which makes them unsuitable for practical engineering purposes. In this paper an attempt is made to establish a simpler concept to deal with the question of constraints. The concept includes suggestion of a new parameter, gmT, to quantify the constraints, and a rough theoretical framework that allows fracture toughness to be corrected for the effect of constraints by closed form equations. The boncept is well suited to be applied in an engineering failure analysis.
Publication Source: Materialprüfung, ISSN: 0025-5300
Issue: 2002-11/12, pp 448-453
Publisher: Carl Hanser Verlag München
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