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Elasticity and Damping Characteristics of SMA Single Crystals, Polycrystals and Thin Films
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SYSNO ASEP 0387976 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title Elasticity and Damping Characteristics of SMA Single Crystals, Polycrystals and Thin Films Author(s) Landa, Michal (UT-L) RID
Seiner, Hanuš (UT-L) RID, ORCID
Sedlák, Petr (UT-L) RID, ORCID
Bodnárová, Lucie (UT-L) RID, ORCIDSource Title 4th International Conference Smart, Material, Structures, Systems . - Faenza : Techna Group, 2012
S. 72-72Number of pages 1 s. Action CIMTEC 2012 /4./ Event date 10.06.2012-14.06.2012 VEvent location Tuscany Country IT - Italy Event type WRD Language eng - English Country IT - Italy Keywords elasticity ; damping characteristics ; ferroelastics Subject RIV BJ - Thermodynamics Subject RIV - cooperation Institute of Physics R&D Projects GA101/09/0702 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20760514 - UT-L (2005-2011) Annotation We discuss the applicability ultrasonic methods for precise determination of elasticity and damping characteristics of ferroelastics in the form of single crystals, polycrystalline materials and thin films. Particular behaviors of SMAs as are strong elastic anisotropy of single crystals, anomalous temperature dependence of elastic coefficients, their change with magnetic field (ferromagnetic SMAs) natural tendency of martensitic (low-symmetry) phase to form twinned structures as well as texture and fine grains structure of polycrystalline materials induced by technological processing are taken into account to the analysis of mechanical properties of SMAs. It is shown that by using a modal resonant ultrasound spectroscopy (RUS), the fully anisotropic elastic tensor (21 independent coefficients) of textured and micro-structured polycrystals can be determined, from which the symmetry class can be estimated with a search method of mirrors in the elastic tensor. The close correlation between the elastic anisotropy and the spatial arrangement of the grain boundaries in the examined materials is evident. The modified RUS and surface wave propagation (SAW) methods are developed for evaluation of elasticity of thin surface layers. The pros and cons of both approaches are summarized. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2013
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