An evaluation of the stress intensity factor in functionally graded materials

0338918 - ÚFM 2010 RIV CZ eng J - Článek v odborném periodiku
Ševčík, Martin - Hutař, Pavel - Náhlík, Luboš - Knésl, Zdeněk
An evaluation of the stress intensity factor in functionally graded materials.
Applied and Computational Mechanics. Roč. 3, č. 2 (2009), s. 401-410. ISSN 1802-680X
Grant CEP: GA ČR GD106/09/H035; GA ČR GC101/09/J027
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: functionally graded material * power-law material change
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

Functionally graded materials (FGM) are characterised by variations in their material properties in terms of their geometry. They are often used as a coating for interfacial zones to protect the basic material against thermally or mechanically induced stresses. FGM can be also produced by technological process for example butt-welding of the polymer pipes. This work is focused on a numerical estimation of the stress intensity factor for cracks propa-gating through FGM structure. The philosophy of the FE model creation is focused on the discretization of mate-rial properties. The analysis of the FGM layer bonded from both sides with different homogenous materials has been performed to study the influence of the shape of the material property change. The thickness effect of the FGM layer is also discussed. In this pa-per, the above effects are quantified, and conclusions concerning the applicability of the proposed model are dis-cussed.
Trvalý link: http://hdl.handle.net/11104/0182570