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 and Mojmír ŠOB

Basic information

Original name

Shear instabilities in perfect bcc crystals during simulated tensile tests

Authors

ČERNÝ, Miroslav (203 Czech Republic, guarantor), P. ŠESTÁK (203 Czech Republic), J. POKLUDA (203 Czech Republic) and Mojmír ŠOB (203 Czech Republic, belonging to the institution)

Edition

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

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10302 Condensed matter physics

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 3.664

RIV identification code

RIV/00216224:14740/13:00070181

Organization unit

Central European Institute of Technology

DOI

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

UT WoS

000314223600001

Keywords in English

THEORETICAL STRENGTH; HOMOGENEOUS CRYSTALS; STABILITY; PRINCIPLES; STRESS

Abstract

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.

Links

ED1.1.00/02.0068, research and development project

Name: CEITEC - central european institute of technology

LD12037, research and development project

Name: Studium bimetalických magnetických klastrů a nanodrátů z prvních principů (Acronym: BIMETAL)

Investor: Ministry of Education, Youth and Sports of the CR

Citovat

ČERNÝ, Miroslav, P. ŠESTÁK, J. POKLUDA and Mojmír ŠOB. Shear instabilities in perfect bcc crystals during simulated tensile tests. Physical Review B. The American Physical Society, 2013, vol. 87, No 1, p. "nestránkováno", 4 pp. ISSN 1098-0121. Available from: 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 and Mojmír ŠOB. Shear instabilities in perfect bcc crystals during simulated tensile tests. \textit{Physical Review B}. The American Physical Society, 2013, vol.~87, No~1, p.~''nestránkováno'', 4 pp. ISSN~1098-0121. Available from: https://dx.doi.org/10.1103/PhysRevB.87.014117.

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