Publication detail
Dislocation-based model of plasticity and roughness-induced crack closure
POKLUDA, J.
Czech title
Dislokační model plasticky a drsnostně indukovaného zavírání trhliny
English title
Dislocation-based model of plasticity and roughness-induced crack closure
Type
journal article in Web of Science
Language
en
Original abstract
The paper presents a discrete dislocation model of contact shielding effects in the case of small-scale yielding under plane-strain conditions. The model is physically transparent and, unlike continuum-based models for plane stress, it enables us to directly assess the magnitude of both plasticity and roughness-induced components of crack closure. Moreover, it reflects an influence of microstructure on the roughness-induced term. The closure components can be simply extracted from experimentally measured values of the remote DK using standard data on mechanical properties and microstructure. Thus, the effective threshold DKeff,th can be obtained as nearly independent of microstructure coarseness and applied cyclic ratio as shown for several important engineering materials
Czech abstract
The paper presents a discrete dislocation model of contact shielding effects in the case of small-scale yielding under plane-strain conditions. The model is physically transparent and, unlike continuum-based models for plane stress, it enables us to directly assess the magnitude of both plasticity and roughness-induced components of crack closure. Moreover, it reflects an influence of microstructure on the roughness-induced term. The closure components can be simply extracted from experimentally measured values of the remote DK using standard data on mechanical properties and microstructure. Thus, the effective threshold DKeff,th can be obtained as nearly independent of microstructure coarseness and applied cyclic ratio as shown for several important engineering materials.
English abstract
The paper presents a discrete dislocation model of contact shielding effects in the case of small-scale yielding under plane-strain conditions. The model is physically transparent and, unlike continuum-based models for plane stress, it enables us to directly assess the magnitude of both plasticity and roughness-induced components of crack closure. Moreover, it reflects an influence of microstructure on the roughness-induced term. The closure components can be simply extracted from experimentally measured values of the remote DK using standard data on mechanical properties and microstructure. Thus, the effective threshold DKeff,th can be obtained as nearly independent of microstructure coarseness and applied cyclic ratio as shown for several important engineering materials
Keywords in Czech
Crack-tip shielding, Discrete dislocations, Fatigue crack-growth, Effective threshold, Size ratio
Keywords in English
Crack-tip shielding, Discrete dislocations, Fatigue crack-growth, Effective threshold, Size ratio
RIV year
2013
Released
15.01.2013
ISSN
0142-1123
Volume
46
Number
1
Pages from–to
35–40
Pages count
6
BIBTEX
@article{BUT99299,
author="Jaroslav {Pokluda},
title="Dislocation-based model of plasticity and roughness-induced crack closure",
year="2013",
volume="46",
number="1",
month="January",
pages="35--40",
issn="0142-1123"
}