Quantitative analysis of intrinsic mode III fatigue thresholds in bcc metals

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F18%3APU130263" target="_blank" >RIV/00216305:26620/18:PU130263 - isvavai.cz</a>

Alternative codes found

RIV/68081723:_____/18:00498397

Result on the web

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2018.04.022" target="_blank" >http://dx.doi.org/10.1016/j.ijfatigue.2018.04.022</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2018.04.022" target="_blank" >10.1016/j.ijfatigue.2018.04.022</a>

Result language

angličtina

Original language name

Quantitative analysis of intrinsic mode III fatigue thresholds in bcc metals

Original language description

Intrinsic (effective) threshold is a material characteristic important for both engineering and science connected to fatigue crack propagation processes. This paper presents the first attempt to give a quantitative interpretation of the mode III effective threshold. The approach of a local growth mode previously applied to the remote mode II cracks, which led to a prediction of values of the mode II effective threshold in metallic materials, is applied to remote mode III cracks in materials with coplanar shear-mode crack growth (bcc metals). Local mode II stress intensity factors of a zig-zag shaped crack front loaded in the remote mode III were determined by numerical modelling for various angles of in-plane crack front asperities. The results were compared with experimentally measured effective thresholds and geometry of real crack fronts. It was found that for relatively small angles of the in-plane precrack asperities (23° for the ARMCO iron and 25° for niobium) the remote mode III crack propagation can be realized purely by the local mode II growth mechanism. Experimentally measured average angles of asperities on real precrack fronts (25° for the ARMCO iron and 26° for niobium) were very close to those obtained theoretically. This represents a quantitative confirmation of a dominance of the local mode II mechanism previously deduced only qualitatively by observation of fractographical patterns.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

INTERNATIONAL JOURNAL OF FATIGUE

ISSN

0142-1123

e-ISSN

1879-3452

Volume of the periodical

115

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

35-41

UT code for WoS article

000449895700006

EID of the result in the Scopus database

2-s2.0-85046668570