Určení součinitele intenzity napětí ve FGM

Evaluation of stress intensity factor in FGM

abstrakt

en

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. All analyses are simulated as a 2D problem of an edge crack specimen. In this pa-per, the above effects are quantified, and conclusions concerning the applicability of the proposed model are dis-cussed.

Práce se zabývá studiem lomově mechanických parametrů ve funkčně gradientní vrstvě. Je zde navržen postup nerovnoměrné diskretizace mechanických vlastností materiálu za účelem zvýšení efektivnosti řešení.

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. All analyses are simulated as a 2D problem of an edge crack specimen. In this pa-per, the above effects are quantified, and conclusions concerning the applicability of the proposed model are dis-cussed.

funkčně gradientní materiál, lineárně elastické lomová mechanika, diskretizační postupy, mocninná změna mechanických vlastností

functionally graded material, linear elastic fracture mechanics, discretization methodology, power-law material change

26.10.2009

Západočeská univerzita

Plzeň

978-80-7043-824-4

Computational Mechanics 2009

1–2

2