Microplastic Limit of Steels as a Means of Fatigue Limit Determination

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F13%3A43920446" target="_blank" >RIV/49777513:23210/13:43920446 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378297:_____/13:00424988

Výsledek na webu

<a href="https://www.researchgate.net/publication/273531670_Microplastic_Limit_of_Steels_as_a_Means_of_Fatigue_Limit_Determination" target="_blank" >https://www.researchgate.net/publication/273531670_Microplastic_Limit_of_Steels_as_a_Means_of_Fatigue_Limit_Determination</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.proeng.2013.12.115" target="_blank" >10.1016/j.proeng.2013.12.115</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microplastic Limit of Steels as a Means of Fatigue Limit Determination

Popis výsledku v původním jazyce

The experimental determination of fatigue limit in case of steels represents an expensive and time consuming process not speaking about the necessity of a sufficient volume of representative material necessary for the specimens manufacturing, manufacturing of numerous test specimens, the need of an expensive (electrohydraulic) test equipment etc. Microplastic strains occurring at stresses below the yield point play a significant role at cyclic loading of metals withinin high cycle fatigue region. The microplastic strains cannot be measured by common methods due to the discontinuity of their distribution and a varying character of their level in the metal structure, but however, owing to the magnetoelastic effect the threshold stress at which dislocation pile-up stresses begin to obstruct the magnetic domains in rotation to the direction of the tensile stress can be determined by means of changes in magnetic permeability during tensile loading. In the paper, the changes of the magnetic permeability were measured indirectly ? by means of the changes of the electrical impedance (a.c. resistance). The measurement was performed on the normalized low-carbon structural steel CSN 41 1375. The microplastic limit was determined by evaluation the ?R-? records. A comparison with the fatigue limit in a reversed fatigue loading showed that the MPL was below the fatigue limit. The microplastic limit can thus be considered to separate non-damaging and damaging cyclic stresses. The paper presents the results of the abovementioned characteristics what may shorten and make cheeper the determination of the fatigue limit and non-damaging cyclic stresses of structural materials.

Název v anglickém jazyce

Microplastic Limit of Steels as a Means of Fatigue Limit Determination

Popis výsledku anglicky

The experimental determination of fatigue limit in case of steels represents an expensive and time consuming process not speaking about the necessity of a sufficient volume of representative material necessary for the specimens manufacturing, manufacturing of numerous test specimens, the need of an expensive (electrohydraulic) test equipment etc. Microplastic strains occurring at stresses below the yield point play a significant role at cyclic loading of metals withinin high cycle fatigue region. The microplastic strains cannot be measured by common methods due to the discontinuity of their distribution and a varying character of their level in the metal structure, but however, owing to the magnetoelastic effect the threshold stress at which dislocation pile-up stresses begin to obstruct the magnetic domains in rotation to the direction of the tensile stress can be determined by means of changes in magnetic permeability during tensile loading. In the paper, the changes of the magnetic permeability were measured indirectly ? by means of the changes of the electrical impedance (a.c. resistance). The measurement was performed on the normalized low-carbon structural steel CSN 41 1375. The microplastic limit was determined by evaluation the ?R-? records. A comparison with the fatigue limit in a reversed fatigue loading showed that the MPL was below the fatigue limit. The microplastic limit can thus be considered to separate non-damaging and damaging cyclic stresses. The paper presents the results of the abovementioned characteristics what may shorten and make cheeper the determination of the fatigue limit and non-damaging cyclic stresses of structural materials.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/GAP105%2F10%2F2052" target="_blank" >GAP105/10/2052: Poškozující napětí pod mezí únavy určená změnami magnetické permeability</a><br>

Návaznosti

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

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název statě ve sborníku

FATIGUE DESIGN 2013, INTERNATIONAL CONFERENCE PROCEEDINGS

ISBN

—

ISSN

1877-7058

e-ISSN

neuvedeno

Počet stran výsledku

8

Strana od-do

635-642

Název nakladatele

Elsevier Science BV

Místo vydání

Amsterdam

Místo konání akce

Cetim, Senlis, FRANCE

Datum konání akce

27. 11. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000338327000060