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  • Lomové zkoušky při 20°C na čtyřech monokrystalech Fe-3hm%Si ukázaly odklon boční trhliny (110)[001] (rovina trhliny, čelo trhliny) pod úhlem přibližně 45°od osy [-110]. Toto chování bylo nezávislé na rychlosti zatěžování. Fraktografická analýza potvrdila, že trhliny jsou odkloněny podál rovin {100} a že lom byl doprovázen skluzem na rovinách {110} a mechanickým dvojčatěním na rovinách {112}. 3D simulace metodou molekulární dynamiky při 300 K v alfa železe na tělesech s bočními trhlinami ekvivalentní orientace ukázaly, že odklon trhliny je způsoben 3 procesy: dvojčatěním na skloněných rovinách {112}, které brzdí růst původní trhliny, emisí dislokací na skloněných rovinách {011} a {123}, která vede k separaci rovin {100} a může způsobit dekohezi a následné štěpení podél těchto rovin. (cs)
  • Fracture experiments performed at room temperature on four test samples made of Fe-3wt.%Si single crystals have shown deflections of an edge crack (110)[001] (crack plane, crack front) from the axis [-110] of the potential crack extension of approximately 45o. This behavior has appeared to be independent on loading rate. Fractographic analysis confirmed that the cracks were deviated along {100} planes and the fracture was accompanied by slip on {011} planes and by twinning on {112} planes. 3D simulations at 300 K by molecular dynamic technique in bcc iron with edge cracks of equivalent orientation indicated that the crack itself could contribute to understanding of this behavior by 3 processes: twinning on oblique {112} planes, which hindered growth of the original crack, and by emission of dislocations on oblique {011} and {123} planes, which led to separation of the {100} planes and might cause decohesion and subsequent cleavage fracture along mentioned planes.
  • Fracture experiments performed at room temperature on four test samples made of Fe-3wt.%Si single crystals have shown deflections of an edge crack (110)[001] (crack plane, crack front) from the axis [-110] of the potential crack extension of approximately 45o. This behavior has appeared to be independent on loading rate. Fractographic analysis confirmed that the cracks were deviated along {100} planes and the fracture was accompanied by slip on {011} planes and by twinning on {112} planes. 3D simulations at 300 K by molecular dynamic technique in bcc iron with edge cracks of equivalent orientation indicated that the crack itself could contribute to understanding of this behavior by 3 processes: twinning on oblique {112} planes, which hindered growth of the original crack, and by emission of dislocations on oblique {011} and {123} planes, which led to separation of the {100} planes and might cause decohesion and subsequent cleavage fracture along mentioned planes. (en)
Title
  • Deflection of the Crack (110)[001] in bcc Iron Crystals Loaded in Mode I
  • Odklonění trhliny (110)[001] v monokrystalech alfa-železa zatěžovaných v módu I (cs)
  • Deflection of the Crack (110)[001] in bcc Iron Crystals Loaded in Mode I (en)
skos:prefLabel
  • Deflection of the Crack (110)[001] in bcc Iron Crystals Loaded in Mode I
  • Odklonění trhliny (110)[001] v monokrystalech alfa-železa zatěžovaných v módu I (cs)
  • Deflection of the Crack (110)[001] in bcc Iron Crystals Loaded in Mode I (en)
skos:notation
  • RIV/68407700:21340/08:04147698!RIV09-MSM-21340___
http://linked.open...avai/riv/aktivita
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  • Z(MSM6840770021)
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  • 362329
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  • RIV/68407700:21340/08:04147698
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  • Fe-3%Si; block-like shear; dislocation emission; molecular dynamics; twinning (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...ontrolniKodProRIV
  • [203A46F341E8]
http://linked.open...v/mistoKonaniAkce
  • Brno
http://linked.open...i/riv/mistoVydani
  • Brno
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  • Proceedings ECF17 - Multilevel Approach to Fracture of Materials, Components and Structures
http://linked.open...in/vavai/riv/obor
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http://linked.open...cetTvurcuVysledku
http://linked.open...UplatneniVysledku
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  • Haušild, Petr
  • Landa, M.
  • Sedlák, Petr
  • Karlík, Miroslav
  • Prahl, Jakub
  • Lejček, P.
  • Machová, A.
http://linked.open...vavai/riv/typAkce
http://linked.open.../riv/zahajeniAkce
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number of pages
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  • VUTIUM Press
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  • 978-80-214-3692-3
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  • 21340
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