Modelling of Tortuous Crack Fronts in Shear Loading Mode

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F17%3APU126236" target="_blank" >RIV/00216305:26210/17:PU126236 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Modelling of Tortuous Crack Fronts in Shear Loading Mode

Popis výsledku v původním jazyce

The contribution is related to experiments on near-threshold fatigue cracks under shear modes II, III and II+III in bcc metals. Cylindrical bars with circumferential cracked notch were loaded by shear force. The notch is located in the cross-section where no bending moment is present and it is loaded in pure shear. In-plane pre-cracks with microtortuous crack front were created by compressive cyclic loading in mode I to obtain smooth fracture surfaces and, consequently, the effective values of crack driving force could be measured. The circumferential pre-crack front could be modelled as a serrated front of a linear roughness identical to the real one. As reported elsewhere, the fatigue crack in bcc metals loaded under shear modes II, III and II+III always grows by creation and coalescence of local tongues loaded in mode II. Therefore, the aim of the model was to calculate the local stress intensity factor k 2 as a driving force for fatigue crack initiation and growth along the whole serrated crack fr

Název v anglickém jazyce

Modelling of Tortuous Crack Fronts in Shear Loading Mode

Popis výsledku anglicky

The contribution is related to experiments on near-threshold fatigue cracks under shear modes II, III and II+III in bcc metals. Cylindrical bars with circumferential cracked notch were loaded by shear force. The notch is located in the cross-section where no bending moment is present and it is loaded in pure shear. In-plane pre-cracks with microtortuous crack front were created by compressive cyclic loading in mode I to obtain smooth fracture surfaces and, consequently, the effective values of crack driving force could be measured. The circumferential pre-crack front could be modelled as a serrated front of a linear roughness identical to the real one. As reported elsewhere, the fatigue crack in bcc metals loaded under shear modes II, III and II+III always grows by creation and coalescence of local tongues loaded in mode II. Therefore, the aim of the model was to calculate the local stress intensity factor k 2 as a driving force for fatigue crack initiation and growth along the whole serrated crack fr

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20306 - Audio engineering, reliability analysis

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

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