Publication detail
Dislocation-based and Continuum Models of Crack tip Shielding in Fatigue
POKLUDA, J.
Czech title
Stínění špice trhliny pomocí dislokačních modelů a modelů kontinua
English title
Dislocation-based and Continuum Models of Crack tip Shielding in Fatigue
Type
abstract
Language
en
Original abstract
Along with external forces and the macro-geometry of cracked bodies, the local stress intensity factors k (or \delta k) at fronts of brittle and fatigue cracks are also determined by internal residual stress fields and the crack front microgeometry (extrinsic shielding). Consequently, the values of k (\delta k) that represent a real crack driving force can be significantly different from those of the remote K (\delta K). This means that, even in the frame of two-parameter linear-elastic fracture mechanics, a characterization of the crack-tip stress field only by K and T is not sufficient at all.
Czech abstract
Spolu s vnějšími silami a makro- geometrie popraskaných těl, místní faktory intenzity napětí K ( nebo \ delta K ) na frontách křehkých trhlin a únava také určují vnitřní zbytkové napětí polí a trhliny přední microgeometry odst. vnější stínění) . V důsledku toho lze hodnoty k ( \ delta K) , které představují skutečnou hnací sílu trhliny výrazně odlišné od těch na dálkové K (\ delta K). To znamená, že i v rámci dvou parametru lineární lomová mechanika,charakteristika crack tip stresu oblasti pouze K a T nestačí vůbec.
English abstract
Along with external forces and the macro-geometry of cracked bodies, the local stress intensity factors k (or \delta k) at fronts of brittle and fatigue cracks are also determined by internal residual stress fields and the crack front microgeometry (extrinsic shielding). Consequently, the values of k (\delta k) that represent a real crack driving force can be significantly different from those of the remote K (\delta K). This means that, even in the frame of two-parameter linear-elastic fracture mechanics, a characterization of the crack-tip stress field only by K and T is not sufficient at all.
Keywords in Czech
Crack tip shielding; Dislocation-based model; Continuum model
Keywords in English
Stínění špice trhliny; Dislokační model; Modelů kontinua
Released
01.07.2011
Publisher
Politechnika Opole
Location
Opole
ISSN
1429-6055
Volume
99
Number
343
Pages from–to
44–45
Pages count
2