. . "The micromechanics of self-affine fractal cracks in brittle materials"@en . . " fracture toughness" . . . "12"^^ . . "12"^^ . "2009-10-22+02:00"^^ . . . "http://www.isvav.cz/projectDetail.do?rowId=GA106/06/0646"^^ . "2006-01-01+01:00"^^ . "Micro-structural effects on the fractality of cracks in brittle and quasi-brittle materials will be investigated. Irregularities of fracture surface described by self-similar or self-affine fractals will be followed in the direct relationship to micro-mechanisms of fracture initiation and propagation and as a function of local energy release rate and crack velocity. Since the fracture surfaces correspond to conditions of self-affinity in almost all cases, new transformation of such surface co-ordinates will be found so that surface roughness image is scale invariant. The principal aim of the project is to formulate a fractal model for prediction of fracture damage development from its initiation to final brittle fracture instability. The model will be experimentally verified on selected ceramics, steels and other quasi-brittle materials. Fractal modelling of fracture surface creation in brittle materials could reveal new geometrical sources of toughening. Using an experimental data and"@en . "fractal analysis" . . . . . . . . . . "The project was addressed to study of micro-structural effects on the fractality of cracks in brittle and quasi-brittle steels for high-tech applications. Irregularities of fracture surface described by self-similar or self-affine fractals were investiga"@en . " brittle failure" . "1"^^ . "fractal analysis; brittle failure; fracture toughness; fracture micromechanics"@en . "Projekt byl zam\u011B\u0159en na studium \u00FA\u010Dink\u016F mikrostruktury na fraktalitu trhlin v k\u0159ehk\u00FDch a kvazik\u0159ehk\u00FDch ocel\u00EDch pro n\u00E1ro\u010Dn\u00E9 technick\u00E9 aplikace. Nepravidelnosti lomov\u00E9 plochy popsan\u00E9 sob\u011Bpodobn\u00FDmi a selfafinn\u00EDmi frakt\u00E1ly byly studov\u00E1ny v p\u0159\u00EDm\u00E9m vztahu k mikr"@cs . "2"^^ . "Projekt je zam\u011B\u0159en na studium\u00A0\u00FA\u010Dink\u016F mikrostruktury na fraktalitu trhlin v k\u0159ehk\u00FDch a kvazik\u0159ehk\u00FDch materi\u00E1lech. Budou zkoum\u00E1ny nepravidelnosti lomov\u00E9 plochy kvantifikovan\u00E9 jako funkce hnac\u00ED s\u00EDly a rychlosti \u0161\u00ED\u0159en\u00ED trhliny sob\u011Bpodobn\u00FDmi a selfafinn\u00EDmi frakt\u00E1ly v p\u0159\u00EDm\u00E9 vazb\u011B na mikromechanismus iniciace a \u0161\u00ED\u0159en\u00ED poru\u0161en\u00ED. Proto\u017Ee lomov\u00E9 plochy v\u011Bt\u0161inou odpov\u00EDdaj\u00ED podm\u00EDnk\u00E1m selfafinity, budou hled\u00E1ny takov\u00E9 transformace, kter\u00E9 povedou ke kvantifikaci lomov\u00E9ho reli\u00E9fu nez\u00E1visl\u00E9 na m\u011B\u0159\u00EDtku. Hlavn\u00ED c\u00EDl projektu tak lze spat\u0159ovat ve vytvo\u0159en\u00ED frakt\u00E1ln\u00EDho modelu predikce v\u00FDvoje k\u0159ehk\u00E9ho po\u0161kozen\u00ED od iniciace a\u017E po nestabiln\u00ED lom. Model bude experiment\u00E1ln\u011B ov\u011B\u0159ov\u00E1n na vybran\u00FDch materi\u00E1lech typu keramik a ocel\u00ED, resp. dal\u0161\u00EDch materi\u00E1l\u016F s kvazik\u0159ehk\u00FDm chov\u00E1n\u00EDm. Frakt\u00E1ln\u00ED modelov\u00E1n\u00ED tvorby lomov\u00E9 plochy k\u0159ehk\u00FDch materi\u00E1l\u016F by m\u011Blo odhalit nov\u00E9 geometrick\u00E9 zdroje zhou\u017Eevnat\u011Bn\u00ED. Za pou\u017Eit\u00ED experiment\u00E1ln\u00EDch dat a nov\u011B vyvinut\u00E9ho frakt\u00E1ln\u00EDho modelu budou specifikov\u00E1ny mezn\u00ED stavy pevnosti a hou\u017Eevnatosti" . "2008-12-31+01:00"^^ . . . "0"^^ . "Mikromechanika selfafinn\u00EDch frakt\u00E1ln\u00EDch trhlin v k\u0159ehk\u00FDch materi\u00E1lech" . "2008-04-25+02:00"^^ . "GA106/06/0646" . .