Effect of time-dependent material properties on the crack behavior in the interface of two polymeric materials

0370349 - ÚFM 2012 RIV LV eng J - Journal Article
Zouhar, Michal - Hutař, Pavel - Náhlík, Luboš - Knésl, Zdeněk
Effect of time-dependent material properties on the crack behavior in the interface of two polymeric materials.
Mechanics of Composite Materials. Roč. 47, č. 2 (2011), s. 203-210. ISSN 0191-5665. E-ISSN 1573-8922
R&D Projects: GA ČR GC101/09/J027; GA ČR GD106/09/H035; GA ČR GA106/09/0279
Institutional research plan: CEZ:AV0Z20410507
Keywords : multilayer plastic pipes * bimaterial interface * stability criteria * critical stress * time-depended material properties
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Impact factor: 0.409, year: 2011

Crack penetration through the bimaterial interface of two polymers is investigated numerically. Due to the practical importance of the problem, a crack in a three-layer pipe consisting of a main and two, inner and outer, protective layers is analyzed in this paper. The prime aim is to formulate the conditions under which the crack stays arrested at the interface between the protective layer and the main pipe or penetrates into the interface and causes failure of the main pipe and consequently of the entire pipe system. The crack tip stress field is described by using a generalized stress intensity factor for cases where the crack touches the interface and the stress singularity exponent differs from 1/2. The results presented here may contribute to a more accurate estimation of the residual lifetime of multilayer pipes.
Permanent Link: http://hdl.handle.net/11104/0204182