"Understanding the crack propagation in ceramic multilayer structures to enhance mechanical properties."@en . . " finite fracture mechanics" . "2014-03-31+02:00"^^ . . . . . . "crack propagation; ceramic laminates; finite fracture mechanics; FEM simulations"@en . . . . . "0"^^ . "2014-01-01+01:00"^^ . . . "http://www.isvav.cz/projectDetail.do?rowId=7AMB14AT001"^^ . "Pochopen\u00ED mechanismu \u0161\u00ED\u0159en\u00ED trhliny v keramick\u00FDch v\u00EDcevrstv\u00FDch struktur\u00E1ch s c\u00EDlem z\u00EDsk\u00E1n\u00ED n\u00E1stroje pro vylep\u0161en\u00ED jejich mechanick\u00FDch vlastnost\u00ED." . . . "0"^^ . "The aim of the project is to develop and verify mathematical tools for the description and prediction of the fracture behaviour of (ceramic based) multilayer structures. These structures are of a high potential e.g. in areas of high temperature applications or other special areas where use of metals is not possible. The considered materials are supposed to be subjected to mechanical and thermal (residual stresses) loading. Main output of the project should be a mathematical description of the crack propagation - crack deflection, interface delamination or crack bifurcation phenomena in the structures containing high residual stresses. Such behaviour, absorbing much more energy than a straight crack propagation, can significantly enhance the fracture toughness of the structure and the ability of its prediction is thus strongly desired. Using the mentioned tools, suitable laminate geometry and material composition can be designed. Concept of the Finite fracture mechanics will be used for the development of the applicable fracture criterion. An essential goal of this project will be experimental verification of the proposed fracture models which is necessary for their correct application and interpretation. The proposed project is targeted to the basic research area of fracture behaviour of layered structures, which becomes in focus due to a gradually increasing number of applications of advanced composite materials. Therefore, any progress in this globally attractive problematic will be utilized in development of new materials tailored for the given application. Proposed work is a logical consequence of gained knowledge of the project team in the research field of laminate materials lasting over a decade."@en . "1"^^ . "crack propagation" . "7AMB14AT001" . "0"^^ . "2015-05-28+02:00"^^ . "0"^^ . . . "2015-12-31+01:00"^^ . " ceramic laminates" . "C\u00EDlem projektu je v\u00FDvoj a ov\u011B\u0159en\u00ED matematick\u00FDch n\u00E1stroj\u016F pro popis a predikci lomov\u00E9ho chov\u00E1n\u00ED v\u00EDcevrstv\u00FDch struktur na b\u00E1zi keramik. Tyto materi\u00E1ly maj\u00ED velk\u00FD potenci\u00E1l nap\u0159. u vysokoteplotn\u00EDch aplikac\u00ED a v dal\u0161\u00EDch speci\u00E1ln\u00EDch oblastech, kde nen\u00ED mo\u017En\u00E9 pou\u017E\u00EDt standardn\u00ED kovov\u00E9 materi\u00E1ly. P\u0159edpokl\u00E1d\u00E1 se, \u017Ee studovan\u00E9 materi\u00E1ly jsou podrobeny kombinovan\u00E9mu zat\u00ED\u017Een\u00ED \u2013 mechanick\u00E9mu a teplotn\u00EDmu, kter\u00E9 vede ke vzniku residu\u00E1ln\u00EDch nap\u011Bt\u00ED. Hlavn\u00EDm v\u00FDstupem projektu by m\u011Bly b\u00FDt experimentem verifikovan\u00E9 matematick\u00E9 modely popisuj\u00EDc\u00ED \u0161\u00ED\u0159en\u00ED trhliny, p\u0159edev\u0161\u00EDm pak ohyb trhliny v oblasti rozhran\u00ED dvou materi\u00E1l\u016F, delaminace rozhran\u00ED nebo bifurkace trhliny ve vrstv\u00E1ch obsahuj\u00EDc\u00EDch vysok\u00E1 residu\u00E1ln\u00ED nap\u011Bt\u00ED. Takov\u00E9 chov\u00E1n\u00ED (absorbuj\u00EDc\u00ED mnohem v\u00EDce energie ne\u017E v p\u0159\u00EDpad\u011B p\u0159\u00EDm\u00E9ho \u0161\u00ED\u0159en\u00ED trhliny) m\u016F\u017Ee v\u00FDznamn\u011B zv\u00FD\u0161it lomovou hou\u017Eevnatost uva\u017Eovan\u00E9ho syst\u00E9mu a tud\u00ED\u017E schopnost toto chov\u00E1n\u00ED predikovat je velmi cenn\u00E1. U\u017Eit\u00EDm zm\u00EDn\u011Bn\u00FDch n\u00E1stroj\u016F lze potom navrhnout vhodnou geometrii lamin\u00E1tu \u010Di kompozici jednotliv\u00FDch materi\u00E1lov\u00FDch slo\u017Eek tak, aby bylo dosa\u017Eeno po\u017Eadovan\u00E9ho chov\u00E1n\u00ED. Pro v\u00FDvoj pou\u017Eiteln\u00E9ho lomov\u00E9ho krit\u00E9ria bude pou\u017Eita koncepce kone\u010Dn\u00E9 lomov\u00E9 mechaniky (FFM). Hlavn\u00EDm a z\u00E1kladn\u00EDm c\u00EDlem projektu bude tedy experiment\u00E1ln\u00ED ov\u011B\u0159en\u00ED navr\u017Een\u00E9ho lomov\u00E9ho modelu, kter\u00E9 je nezbytn\u00E9 pro jeho spr\u00E1vnou aplikaci a interpretaci. Navrhovan\u00FD projekt je c\u00EDlen\u00FD na oblast z\u00E1kladn\u00EDho v\u00FDzkumu lomov\u00E9ho chov\u00E1n\u00ED vrstven\u00FDch struktur, kter\u00E9 nab\u00FDv\u00E1 na v\u00FDznamu d\u00EDky postupn\u011B rostouc\u00EDmu vyu\u017Eit\u00ED pokro\u010Dil\u00FDch kompozitn\u00EDch materi\u00E1l\u016F. Tud\u00ED\u017E jak\u00FDkoliv pokrok v t\u00E9to obecn\u011B atraktivn\u00ED problematice m\u016F\u017Ee slou\u017Eit pro v\u00FDvoj nov\u00FDch materi\u00E1l\u016F \u201E\u0161it\u00FDch\u201C na m\u00EDru pro danou aplikaci. Navrhovan\u00E1 pr\u00E1ce my\u0161lenkov\u011B navazuje na ji\u017E z\u00EDskan\u00E9 znalosti projektov\u00E9ho t\u00FDmu v oblasti kompozitn\u00EDch (vrstven\u00FDch) materi\u00E1l\u016F nabyt\u00E9 za posledn\u00EDch n\u011Bkolik let." . . .