Crack stability condition at the interface between two polymer materials

0370346 - ÚFM 2012 RIV CZ eng K - Conference Paper (Czech conference)
Zouhar, Michal - Hutař, Pavel - Náhlík, Luboš - Ševčík, Martin - Knésl, Zdeněk
Crack stability condition at the interface between two polymer materials.
Applied Mechanics 2011. Brno, Česká republika: Institute of Physics of Materials, Academy of Sciences of the Czech Republic, 2011 - (Náhlík, L.; Zouhar, M.; Ševčík, M.; Seitl, S.; Majer, Z.), s. 247-250. ISBN 978-80-87434-03-1.
[Applied Mechanics 2011. Velké Bílovice (CZ), 18.04.2011-20.04.2011]
R&D Projects: GA ČR GA106/09/0279
Institutional research plan: CEZ:AV0Z20410507
Keywords : stability criterion * critical distance * bi-material * generalized stress intensity factor
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The aim of this work is to study the behaviour of crack with its tip at the interface of two polymer materials. The numerical model of cracked bi-material tension specimen is investigated and a stability criterion was tested. Usually a stability criterion based on general stress concentrator needs the relation between critical value of the generalized stress intensity factor and critical value of the stress intensity factor (fracture toughness). This relation is a function of elastic mismatch between particular materials, fracture toughness of the main material and critical distance d. Estimation of d is usually not straightforward and different authors use different approaches for its determination. Therefore main aim of this study is mutual comparison of published approaches for d estimation and to quantify their effect on the critical loading value. The results of this study can lead to better lifetime prediction and design of layered structures.
Permanent Link: http://hdl.handle.net/11104/0204179