Shear instabilities in perfect bcc crystals during simulated
tensile tests

J 2013

Shear instabilities in perfect bcc crystals during simulated tensile tests

ČERNÝ, Miroslav, P. ŠESTÁK, J. POKLUDA a Mojmír ŠOB

Základní údaje

Originální název

Shear instabilities in perfect bcc crystals during simulated tensile tests

Autoři

ČERNÝ, Miroslav (203 Česká republika, garant), P. ŠESTÁK (203 Česká republika), J. POKLUDA (203 Česká republika) a Mojmír ŠOB (203 Česká republika, domácí)

Vydání

Physical Review B, The American Physical Society, 2013, 1098-0121

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10302 Condensed matter physics

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.664

Kód RIV

RIV/00216224:14740/13:00070181

Organizační jednotka

Středoevropský technologický institut

DOI

http://dx.doi.org/10.1103/PhysRevB.87.014117

UT WoS

000314223600001

Klíčová slova anglicky

THEORETICAL STRENGTH; HOMOGENEOUS CRYSTALS; STABILITY; PRINCIPLES; STRESS

Štítky

ok, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 15. 1. 2014 16:00, prof. RNDr. Mojmír Šob, DrSc.

Anotace

V originále

This work demonstrates a simple but efficient way as to how to determine the existence of shear instabilities in ideal bcc crystals under uniaxial loading. The theoretical tensile strengths are derived from calculated values of the theoretical shear strength and their dependence on the superimposed normal stress. The presented procedure enables us to avoid complicated and time-consuming analyses of elastic stability of crystals. Results of first-principles simulations of coupled shear and tensile deformations for the two most frequent slip systems ({110} < 111 > and {112} < 111 >) in six ideal cubic crystals are used to evaluate the uniaxial tensile strengths in three low-index crystallographic directions (< 100 >, < 110 >, and < 111 >) by assuming a shear instability in the weakest shear system. While instabilities occurring under < 100 > tension are mostly related to the shear in the {112} plane, those occurring during loading in the other two directions are associated with {110} planes. The results are consistent with those predicted by available elastic analyses. The weakest tendency to fail by shear is predicted for uniaxial tension along < 100 >. This is consistent with the occurrence of {100} cleavage planes in bcc metals.

Návaznosti

ED1.1.00/02.0068, projekt VaV

Název: CEITEC - central european institute of technology

LD12037, projekt VaV

Název: Studium bimetalických magnetických klastrů a nanodrátů z prvních principů (Akronym: BIMETAL)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Studium bimetalických magnetických klastrů a nanodrátů z prvních principů

Citovat

ČERNÝ, Miroslav, P. ŠESTÁK, J. POKLUDA a Mojmír ŠOB. Shear instabilities in perfect bcc crystals during simulated tensile tests. Physical Review B. The American Physical Society, 2013, roč. 87, č. 1, s. "nestránkováno", 4 s. ISSN 1098-0121. Dostupné z: https://dx.doi.org/10.1103/PhysRevB.87.014117.

@article{1130112,
   author = {Černý, Miroslav and Šesták, P. and Pokluda, J. and Šob, Mojmír},
   article_number = {1},
   doi = {http://dx.doi.org/10.1103/PhysRevB.87.014117},
   keywords = {THEORETICAL STRENGTH; HOMOGENEOUS CRYSTALS; STABILITY; PRINCIPLES; STRESS},
   language = {eng},
   issn = {1098-0121},
   journal = {Physical Review B},
   title = {Shear instabilities in perfect bcc crystals during simulated tensile tests},
   url = {http://prb.aps.org/abstract/PRB/v87/i1/e014117},
   volume = {87},
   year = {2013}
}

TY  - JOUR
ID  - 1130112
AU  - Černý, Miroslav - Šesták, P. - Pokluda, J. - Šob, Mojmír
PY  - 2013
TI  - Shear instabilities in perfect bcc crystals during simulated tensile tests
JF  - Physical Review B
VL  - 87
IS  - 1
SP  - "nestránkováno"
EP  - "nestránkováno"
PB  - The American Physical Society
SN  - 10980121
KW  - THEORETICAL STRENGTH
KW  - HOMOGENEOUS CRYSTALS
KW  - STABILITY
KW  - PRINCIPLES
KW  - STRESS
UR  - http://prb.aps.org/abstract/PRB/v87/i1/e014117
L2  - http://prb.aps.org/abstract/PRB/v87/i1/e014117
N2  - This work demonstrates a simple but efficient way as to how to determine the existence of shear instabilities in ideal bcc crystals under uniaxial loading. The theoretical tensile strengths are derived from calculated values of the theoretical shear strength and their dependence on the superimposed normal stress. The presented procedure enables us to avoid complicated and time-consuming analyses of elastic stability of crystals. Results of first-principles simulations of coupled shear and tensile deformations for the two most frequent slip systems ({110} < 111 > and {112} < 111 >) in six ideal cubic crystals are used to evaluate the uniaxial tensile strengths in three low-index crystallographic directions (< 100 >, < 110 >, and < 111 >) by assuming a shear instability in the weakest shear system. While instabilities occurring under < 100 > tension are mostly related to the shear in the {112} plane, those occurring during loading in the other two directions are associated with {110} planes. The results are consistent with those predicted by available elastic analyses. The weakest tendency to fail by shear is predicted for uniaxial tension along < 100 >. This is consistent with the occurrence of {100} cleavage planes in bcc metals.
ER  -

ČERNÝ, Miroslav, P. ŠESTÁK, J. POKLUDA a Mojmír ŠOB. Shear instabilities in perfect bcc crystals during simulated tensile tests. \textit{Physical Review B}. The American Physical Society, 2013, roč.~87, č.~1, s.~''nestránkováno'', 4 s. ISSN~1098-0121. Dostupné z: https://dx.doi.org/10.1103/PhysRevB.87.014117.

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