Stanovení směru šíření trhliny na základě přístupu zobecněné lineárně elastické lomové mechaniky

Determination of crack propagation direction using approach based on generalized linear elastic fracture

článek ve sborníku ve WoS nebo Scopus

en

The objective of the paper is to investigate the direction of a further crack propagation from the interface between two elastic materials. The angle of crack propagation changes when the crack passes the interface, due to different material properties of layers. The suggested procedure makes it possible to estimate an angle of crack propagation under which the crack will propagate into the second material. The assumptions of (generalized) linear elastic fracture mechanics, which takes into account stress singularity exponent different from 1/2 are considered. The finite element method was used for numerical calculations. As an example application of the suggested approach on crack propagation through laminar ceramics (residual stresses in individual layers are taken into account) is introduced and results obtained compared with experimental data. The results obtained might contribute to a better understanding of the failure of materials with interfaces (e.g. layered composites, materials with protective coatings) and to a more reliable estimation of the service life of such structures.

Cílem práce je zjistit směr dalšího šíření trhliny s vrcholem na rozhraní mezi dvěmi elastickými materiály. U této konfigurace trhliny dochází ke změně úhlu dalšího šíření vzhledem k různým materiálovým vlastnostem jednotlivých vrstev. Navržený postup umožňuje odhadnout úhel růstu trhliny, pod kterým se bude trhlina šířit do druhého materiálu.

The objective of the paper is to investigate the direction of a further crack propagation from the interface between two elastic materials. The angle of crack propagation changes when the crack passes the interface, due to different material properties of layers. The suggested procedure makes it possible to estimate an angle of crack propagation under which the crack will propagate into the second material. The assumptions of (generalized) linear elastic fracture mechanics, which takes into account stress singularity exponent different from 1/2 are considered. The finite element method was used for numerical calculations. As an example application of the suggested approach on crack propagation through laminar ceramics (residual stresses in individual layers are taken into account) is introduced and results obtained compared with experimental data. The results obtained might contribute to a better understanding of the failure of materials with interfaces (e.g. layered composites, materials with protective coatings) and to a more reliable estimation of the service life of such structures.

šíření trhliny, zobecněný součinitel intenzity napětí, numerická simulace

crack propagation, generalized stress intensity factor, numerical simulation

2012

19.09.2012

9788895940441

The 4th International Conference on Crack Paths (CP2012)

1065–1072

8