"Existing methods for life prediction of components are often not reliable and high safety factors must be used. Recent research into fatigue damage of structural materials revealed new possibilities to evaluate the fatigue life based not only on the stress amplitude but on the plastic strain amplitude. It is important to use a differential characteristic,\u00A0the growth rate of short cracks Within a proposed project new findings concerning the effect of plastic strain amplitude and mean stress will be obtained. The rates of short cracks will be measured and the kinetics of short crack growth for various values of plastic strain amplitudes and mean stresses will be established. Simultaneously the fatigue life of smooth specimens cycled with various plastic strain amplitudes and mean stresses will be determined and correlated with the rates of short crack in order to propose more simple evaluation of relevant parameters."@en . "0"^^ . "Dosavadn\u00ED postupy predikce \u00FAnavov\u00E9 \u017Eivotnosti strojn\u00EDch sou\u010D\u00E1st\u00ED nejsou spolehliv\u00E9 a \u010Dasto\u00A0vedou k\u00A0vysok\u00FDm koeficient\u016Fm bezpe\u010Dnosti. Ned\u00E1vn\u00E9 v\u00FDzkumy \u00FAnavov\u00E9ho po\u0161kozen\u00ED konstruk\u010Dn\u00EDch materi\u00E1l\u016F uk\u00E1zaly nov\u00E9 mo\u017Enosti odhadu \u00FAnavov\u00E9 \u017Eivotnosti zalo\u017Een\u00E9 nejen na amplitud\u011B nap\u011Bt\u00ED ale na znalosti amplitudy plastick\u00E9 deformace.\u00A0Aplikac\u00ED diferenci\u00E1ln\u00ED charakteristiky,\u00A0rychlosti r\u016Fstu kr\u00E1tk\u00FDch \u00FAnavov\u00FDch trhlin lze odhadnout \u00FAnavovou \u017Eivotnost mnohem p\u0159esn\u011Bji.\u00A0 V r\u00E1mci navrhovan\u00E9ho projektu budou z\u00EDsk\u00E1ny nov\u00E9poznatky o vlivu amplitudy plastick\u00E9 deformace a sou\u010Dasn\u011B st\u0159edn\u00EDho nap\u011Bt\u00ED v cyklu nutn\u00E9 pro aplikaci nov\u00FDch princip\u016F predikce \u017Eivotnosti.\u00A0\u00A0Budou m\u011B\u0159eny rychlosti \u0161\u00ED\u0159en\u00ED kr\u00E1tk\u00FDch trhlin a ur\u010Dena z\u00E1vislost kinetiky \u0161\u00ED\u0159en\u00ED na amplitud\u011B plastick\u00E9 deformace\u00A0a na st\u0159edn\u00EDm nap\u011Bt\u00ED. Z\u00E1rove\u0148 budou provedena experiment\u00E1ln\u00ED m\u011B\u0159en\u00ED \u017Eivotnosti hladk\u00FDch vzork\u016F pro r\u016Fzn\u00E9 hodnoty amplitudy plastick\u00E9 deformace a st\u0159edn\u00ED nap\u011Bt\u00ED s c\u00EDlem vz\u00E1jemn\u011B korelovat \u017Eivotnosti a rychlosti \u0161\u00ED\u0159en\u00ED trhlin a umo\u017Enit jednodu\u0161\u0161\u00ED" . . . . "1"^^ . "2009-04-22+02:00"^^ . "0"^^ . "2015-01-22+01:00"^^ . "fatigue; damage; crack; lifetime; reliability"@en . . . . " damage" . " crack" . "Nov\u00E9 principy pro predikci \u017Eivotnosti strojn\u00EDch sou\u010D\u00E1st\u00ED zat\u011B\u017Eovan\u00FDch prom\u011Bnn\u00FDmi silami" . . "21"^^ . . "21"^^ . . . "2007-01-01+01:00"^^ . "GA101/07/1500" . . "http://www.isvav.cz/projectDetail.do?rowId=GA101/07/1500"^^ . " lifetime" . "Novel principles for life prediction in variable loading of components"@en . "V pr\u016Fb\u011Bhu \u0159e\u0161en\u00ED projektu byla z\u00EDsk\u00E1na \u0159ada nov\u00FDch poznatk\u016F o iniciaci a po\u010D\u00E1te\u010Dn\u00EDch etap\u00E1ch rozvoje \u00FAnavov\u00FDch trhlin ve zku\u0161ebn\u00EDch t\u011Blesech z r\u016Fzn\u00FDch konstruk\u010Dn\u00EDch materi\u00E1l\u016F. Z\u00EDskan\u00E9 v\u00FDsledky bude mo\u017Eno vyu\u017E\u00EDt pro stanoven\u00ED postup\u016F pro odhad \u00FAnavov\u00E9 \u017Eivo"@cs . . . . "."@en . . . "2009-12-31+01:00"^^ . . . "fatigue" . . .