Numerical investigation of stress singularities in cracked bimaterial body

0318826 - ÚFM 2009 RIV CH eng J - Journal Article
Náhlík, Luboš - Šestáková, Lucie - Hutař, Pavel
Numerical investigation of stress singularities in cracked bimaterial body.
[Numericke urceni singularit napětí v bi-materiálovém tělese s trhlinou.]
Key Engineering Materials. Roč. 385-387, - (2008), s. 125-128. ISSN 1013-9826.
[International Conference on Fracture and Damage Mechanics /7./. Seoul, 09.09.2008-11.09.2008]
R&D Projects: GA AV ČR(CZ) KJB200410803; GA ČR GP106/06/P239; GA ČR GA106/08/1409
Institutional research plan: CEZ:AV0Z20410507
Keywords : bimaterial interface * stress singularity exponent * corner singularity * vertex singularity * general singular stress concentrator
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Composite materials or generally materials with interfaces are nowadays used in many varied engineering applications. In comparison with classical engineering materials the existence of material interface causes locally different stress distribution, which can strongly influence behaviour of whole structure and can have an important influence on failure mechanisms of such materials. The paper presented is devoted to the investigation of stress singularity exponents of a crack growing in a bimaterial body perpendicularly to the interface and touching the material interface. Discrepancies between value of stress singularity exponent in the centre of bimaterial body and on the free surface were found. The assumptions of linear elastic fracture mechanics (LEFM) and small scale yielding (SSY) are considered. For numerical calculations finite element analysis was used. Results obtained can contribute to a better understanding of failure of materials with interfaces.

Použití materiálů s rozhraními v praxi je čím dál častější. Přítomnost rozhraní významně ovlivňuje rozložení napětí v tělese. Článek je věnován určování exponentů singularity pro trhlinu kolmou a končící na bi-materiálovém rozhraní. Studovány jsou především rozdíly mezi povrchem tělesa a jeho středem, a to pomocí metody konečných prvků.
Permanent Link: http://hdl.handle.net/11104/0168136