Various methods of numerical estimation of generalized stress intensity factors of bi-material notches

0346856 - ÚFM 2011 RIV CZ eng J - Journal Article
Klusák, Jan - Profant, T. - Kotoul, M.
Various methods of numerical estimation of generalized stress intensity factors of bi-material notches.
Applied and Computational Mechanics. Roč. 3, č. 2 (2009), s. 297-304. ISSN 1802-680X
R&D Projects: GA ČR GA101/08/0994
Institutional research plan: CEZ:AV0Z20410507
Keywords : Generalized stress intensity factor * Fracture mechanics * Bi-material notch * Generalized singular stress concentrator
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The study of bi-material notches becomes a topical problem as they can model efficiently geometrical or mate-rial discontinuities. When assessing crack initiation conditions in the bi-material notches, the generalized stress intensity factors H have to be calculated. Contrary to the determination of the K-factor for a crack in an isotropic homogeneous medium, for the ascertainment of the H-factor there is no procedure incorporated in the calculation systems. The calculation of these fracture parameters requires experience. Direct methods of estimation of H-factors need choosing usually length parameter entering into calculation. On the other hand the method combining the application of the reciprocal theorem (Psi-integral) and FEM does not require entering any length parameter and is capable to extract the near-tip information directly from the far-field deformation.
Permanent Link: http://hdl.handle.net/11104/0187771