Evaluation of stress intensity factors under multiaxial and compressive conditions using low order displacement or stress field fitting. (15th February 2018)

• Record Type: Journal Article
• Authors: Andersson, Robin; Larsson, Fredrik; Kabo, Elena
• Is Part Of: Engineering fracture mechanics. Volume 189(2018)
• Page Start: 204
• Page End: 220
• Publication Date: 2018-02-15
• Subjects: Linear elastic fracture mechanics -- Stress intensity factors -- XFEM -- Contact loading -- Least squares fitting; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2017.11.015
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: SIFs are estimated by fitting a minimalistic ansatz to FE-approximations. Different modes are accurately distinguished during mixed mode loading. Accurate results are obtained even for the case of compressive loading. XFEM applicability decreases the meshing effort. Application example of a surface breaking RCF crack in a rail head. Abstract: A methodology for evaluation of stress intensity factors from the asymptotic displacement (or stress) fields at a crack front is proposed. The methodology strives to be of practical use in conjunction with commercial FE-codes, also when approaches such as XFEM are employed. To this end, the matching of the fields is carried out through a minimalistic, low order, ansatz of the displacement and stress fields. As demonstrated, the proposed methodology can deal with multiaxial loading of curved crack fronts in three-dimensional bodies. The methodology shows good accuracy also for compressive loading when crack face friction can be neglected.