Effect of switching stresses on domain evolution during quasi-static crack growth in a ferroelastic single crystal / Peter Neumeister in Acta materialia, Vol. 58 N° 7 (Avril 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2577–2584 Titre : Effect of switching stresses on domain evolution during quasi-static crack growth in a ferroelastic single crystal Type de document : texte imprimé Auteurs : Peter Neumeister, Auteur ; Hannes Kessler, Auteur ; Herbert Balke, Auteur Année de publication : 2011 Article en page(s) : pp. 2577–2584 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Fracture toughening Ferroelastic domain switching Switching stress single crystal Résumé : The present paper demonstrates the effect of switching stresses on domain evolution and fracture toughening during quasi-static crack growth in elastically isotropic ferroelastic single crystals with transversally isotropic ferroelastic strains. With a simple switching algorithm and crack propagation procedure, domain evolution is simulated in an exemplary material with semi-infinite crack under mode I loading, starting from a mono-domain configuration. Domain reorientation is found to be strongly affected by switching stresses, which therefore have to be considered in the context of domain evolution modelling and fracture toughening. Before the onset of crack growth a needle-like domain is formed at the tip of the stationary crack, but this does not effect the crack tip stress intensity factor. Elongation of this domain during the onset of crack growth causes a large increase of the fracture toughness. Domain separation in a later stage results in toughness reduction. The subsequent domain evolution indicates a periodic formation of needle-like domains as observed in soft ferroelastic materials. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409009021 [article] Effect of switching stresses on domain evolution during quasi-static crack growth in a ferroelastic single crystal [texte imprimé] / Peter Neumeister, Auteur ; Hannes Kessler, Auteur ; Herbert Balke, Auteur . - 2011 . - pp. 2577–2584. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2577–2584 Mots-clés : Fracture toughening Ferroelastic domain switching Switching stress single crystal Résumé : The present paper demonstrates the effect of switching stresses on domain evolution and fracture toughening during quasi-static crack growth in elastically isotropic ferroelastic single crystals with transversally isotropic ferroelastic strains. With a simple switching algorithm and crack propagation procedure, domain evolution is simulated in an exemplary material with semi-infinite crack under mode I loading, starting from a mono-domain configuration. Domain reorientation is found to be strongly affected by switching stresses, which therefore have to be considered in the context of domain evolution modelling and fracture toughening. Before the onset of crack growth a needle-like domain is formed at the tip of the stationary crack, but this does not effect the crack tip stress intensity factor. Elongation of this domain during the onset of crack growth causes a large increase of the fracture toughness. Domain separation in a later stage results in toughness reduction. The subsequent domain evolution indicates a periodic formation of needle-like domains as observed in soft ferroelastic materials. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409009021

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