Influence of Secondary Phase on Intrinsic Threshold and Path of Shear-Mode Fatigue Cracks in Metals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00499562" target="_blank" >RIV/68081723:_____/18:00499562 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.12693/APhysPolA.134.699" target="_blank" >http://dx.doi.org/10.12693/APhysPolA.134.699</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.12693/APhysPolA.134.699" target="_blank" >10.12693/APhysPolA.134.699</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Secondary Phase on Intrinsic Threshold and Path of Shear-Mode Fatigue Cracks in Metals

Popis výsledku v původním jazyce

The paper deals with intrinsic behaviour of long fatigue cracks under the remote mode II and mode III loading, particularly with the intrinsic (effective) thresholds and the crack path geometry from the point of view of the competition between the local shear and the local opening growth mode. Unlike in the case of opening mode I cracks, the microstructure can significantly influence the dominant growth mechanism of the shear-mode cracks in dependence of the type of the secondary phase. The cementite lamellae of the pearlitic steel change the local growth mode from mode II to mode I and increased the effective mode II and mode III thresholds, whereas the _-Ti lamellae of the Ti6Al4V alloy do not change the intrinsic behaviour. The difference can be explained by different ability of dislocations to cross the phase boundary. The competition between the local shear and the local opening growth modes in metals is assessed by a newly proposed mode I branching criterion based on fracture mechanics. Using this criterion, the value of the deflection angle corresponding to the transition between the dominant mode I and dominant mode II crack growth was found to be of 46_. This result agrees well with the previously published value of the transient angle based on identification of characteristic fractographical patterns on the fracture surfaces of investigated metallic materials.

Název v anglickém jazyce

Influence of Secondary Phase on Intrinsic Threshold and Path of Shear-Mode Fatigue Cracks in Metals

Popis výsledku anglicky

The paper deals with intrinsic behaviour of long fatigue cracks under the remote mode II and mode III loading, particularly with the intrinsic (effective) thresholds and the crack path geometry from the point of view of the competition between the local shear and the local opening growth mode. Unlike in the case of opening mode I cracks, the microstructure can significantly influence the dominant growth mechanism of the shear-mode cracks in dependence of the type of the secondary phase. The cementite lamellae of the pearlitic steel change the local growth mode from mode II to mode I and increased the effective mode II and mode III thresholds, whereas the _-Ti lamellae of the Ti6Al4V alloy do not change the intrinsic behaviour. The difference can be explained by different ability of dislocations to cross the phase boundary. The competition between the local shear and the local opening growth modes in metals is assessed by a newly proposed mode I branching criterion based on fracture mechanics. Using this criterion, the value of the deflection angle corresponding to the transition between the dominant mode I and dominant mode II crack growth was found to be of 46_. This result agrees well with the previously published value of the transient angle based on identification of characteristic fractographical patterns on the fracture surfaces of investigated metallic materials.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

ACTA PHYSICA POLONICA A

ISSN

1898-794X

e-ISSN

—

Svazek periodika

134

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

4

Strana od-do

699-702

Kód UT WoS článku

000453257500021

EID výsledku v databázi Scopus

2-s2.0-85058970513