. . "Vy\u0161et\u0159ov\u00E1n\u00ED mikrostruktury materi\u00E1lu metodami ultrazvukov\u00E9 spektroskopie"@cs . . "23"^^ . "2006-01-01+01:00"^^ . "2008-12-31+01:00"^^ . "Material microstructure investigation by ultrasound spectroscopic methods"@en . "1"^^ . . . . . "ultrasound spectroscopy; inverse problem; smart materials; metallic composites"@en . . . . . "2"^^ . "4448"^^ . "Funk\u010Dn\u00ED materi\u00E1ly jako jsou slitiny s\u00A0tvarovou pam\u011Bt\u00ED (SMA) mohou nahradit tradi\u010Dn\u00ED komponenty modern\u00EDch technick\u00FDch konstrukc\u00ED s\u00A0aktivn\u00ED zp\u011Btnou vazbou. Pro dosa\u017Een\u00ED t\u011Bchto c\u00EDl\u016F je nezbytn\u00E1 dokonal\u00E1 znalost funk\u010Dn\u00EDho chov\u00E1n\u00ED SMA (superelasticita, pam\u011B\u0165ov\u00E9 jevy, tlumen\u00ED vibrac\u00ED). Navrhovan\u00FD projekt je zam\u011B\u0159en na v\u00FDvoj, p\u0159izp\u016Fsoben\u00ED a zcela nov\u00E9 pou\u017Eit\u00ED modern\u00EDch metod ultrazvukov\u00E9 spektroskopie pro nedestruktivn\u00ED vy\u0161et\u0159ov\u00E1n\u00ED vlastnost\u00ED a funk\u010Dn\u00EDho chov\u00E1n\u00ED SMA. Ultrazvukov\u00E1 spektroskopie vych\u00E1z\u00ED bu\u010F z m\u011B\u0159en\u00ED frekven\u010Dn\u00ED odezvy kmit\u00E1n\u00ED vzorku zkouman\u00E9ho materi\u00E1lu (rezonan\u010Dn\u00ED ultrazvukov\u00E1 spektroskopie) nebo z anal\u00FDzy frekven\u010Dn\u00EDch z\u00E1vislost\u00ED rychlosti a \u00FAtlumu \u0161\u00ED\u0159\u00EDc\u00ED se akustick\u00E9 vlny dan\u00FDm prost\u0159ed\u00EDm (pulzn\u00ED metody). Pl\u00E1novan\u00FD experiment\u00E1ln\u00ED program zahrnuje m\u011B\u0159en\u00ED i) elastick\u00FDch konstant jednotliv\u00FDch f\u00E1z\u00ED SMA, ii) zm\u011Bny elastick\u00FDch vlastnost\u00ED p\u0159i f\u00E1zov\u00FDch transformac\u00EDch indukovan\u00FDch nap\u011Bt\u00EDm a teplotou a iii) elastick\u00FDch vlastnost\u00ED, vnit\u0159n\u00EDho t\u0159en\u00ED a materi\u00E1lov\u00FDch nelinearit"@cs . . "Smart materials as phase transforming shape memory alloys (SMA) may possibly substitute more traditional active feed-back control components of modern engineering structures. To achieve that, better knowledge of their functional behaviors (superelasticity, memory effects, vibration damping) is needed. This project focuses development, adaptation and first ever employment of advanced ultrasound spectroscopy techniques for nondestructive characterization of functional behaviors of SMAs. Theultrasound spectroscopic techniques are based on the evaluation of resonance frequencies of excited material samples (Resonant Ultrasonic Spectroscopy) or on the analysis of frequency dependences of the ultrasonic velocities and attenuation measured by pulse-echo techniques. They will be used for the measurement of the: i) yet unknown elastic constants of phases in SMAs, ii) stress and temperature dependence of the elastic properties of phases in SMAs and iii) elastic properties, internal friction and"@en . "4448"^^ . . "23"^^ . "0"^^ .