Propagation of Long Fatigue Cracks under Remote Mode II, III and II+III in Metals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F13%3APU106479" target="_blank" >RIV/00216305:26620/13:PU106479 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Propagation of Long Fatigue Cracks under Remote Mode II, III and II+III in Metals

Popis výsledku v původním jazyce

The aim of this research was to elucidate the crack growth micromechanism of modes II, III and mixed mode II+III in metallic materials. Experiments were performed on ferritic and austenitic steels and titanium (BCC, FCC and HCP metals) using CTS specimenloading for pure mode II, torsion device for pure mode III and special device for all modes II, III and the mixed mode II+III. The notches were precracked and thermally treated in a way that minimized crack closure effects. Crack growth rate dependenceson stress intensity factor ranges were acquired and the threshold values for each loading mode and material were determined. Mode III thresholds were higher than those of mode II for different steels, which is in accordance with available micromechanismmodels. Similarly, mode II had higher contribution to mixed-mode II+III crack propagation. Fracture morphologies were studied using stereophotogrammetry in SEM and statistical evaluation of angles of crack-wake asperities. Significant di

Název v anglickém jazyce

Propagation of Long Fatigue Cracks under Remote Mode II, III and II+III in Metals

Popis výsledku anglicky

The aim of this research was to elucidate the crack growth micromechanism of modes II, III and mixed mode II+III in metallic materials. Experiments were performed on ferritic and austenitic steels and titanium (BCC, FCC and HCP metals) using CTS specimenloading for pure mode II, torsion device for pure mode III and special device for all modes II, III and the mixed mode II+III. The notches were precracked and thermally treated in a way that minimized crack closure effects. Crack growth rate dependenceson stress intensity factor ranges were acquired and the threshold values for each loading mode and material were determined. Mode III thresholds were higher than those of mode II for different steels, which is in accordance with available micromechanismmodels. Similarly, mode II had higher contribution to mixed-mode II+III crack propagation. Fracture morphologies were studied using stereophotogrammetry in SEM and statistical evaluation of angles of crack-wake asperities. Significant di

Druh

O - Ostatní výsledky

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP108%2F10%2F0698" target="_blank" >GAP108/10/0698: Nové přístupy k výzkumu únavového šíření trhliny v módech II, III a II+III</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