Damage progression in silicon nitride undergoing non-conforming hybrid cyclic contact

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F17%3A00481381" target="_blank" >RIV/68081723:_____/17:00481381 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2017.08.010" target="_blank" >http://dx.doi.org/10.1016/j.ijfatigue.2017.08.010</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijfatigue.2017.08.010" target="_blank" >10.1016/j.ijfatigue.2017.08.010</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Damage progression in silicon nitride undergoing non-conforming hybrid cyclic contact

Popis výsledku v původním jazyce

Bearings experience one of the most severe mechanical loading of all machine elements. The contactnstresses engendered are highly localised and bound to a very small volume of the material. The aim ofnthis study was to investigate how localised stresses influence the damage mechanism in hybrid contact.nCyclic contact loading of a gas pressure sintered silicon nitride (GPSN) was investigated. Silicon nitridendisks and tungsten carbide (WC) indenters were tested under different media, initially at ‘‘application relevant”nlow contact pressures (4–6 GPa) and further on, to accelerate damage, at high contact pressuresn(10–15 GPa). The low load experiments showed various forms of surface damage with no significant differencenbetween dry and lubricated contact. Whereas, the high load experiments showed different damagenbehaviour under unlubricated and lubricated conditions. Unlubricated contact resulted in thenformation of transfer layers and Hertzian cracks on the silicon nitride surface whereas, damage undernlubricated contact was mainly dominated by grain removal and delayed crack formation. Finite elementnsimulations were carried out to study the stress state under different loading conditions. The FEM resultsnindicated that the combination of surface tensile and shear stresses predominantly influence the fatiguendamage observed in the experiments rather than fluctuating tensile stresses only.

Název v anglickém jazyce

Damage progression in silicon nitride undergoing non-conforming hybrid cyclic contact

Popis výsledku anglicky

Bearings experience one of the most severe mechanical loading of all machine elements. The contactnstresses engendered are highly localised and bound to a very small volume of the material. The aim ofnthis study was to investigate how localised stresses influence the damage mechanism in hybrid contact.nCyclic contact loading of a gas pressure sintered silicon nitride (GPSN) was investigated. Silicon nitridendisks and tungsten carbide (WC) indenters were tested under different media, initially at ‘‘application relevant”nlow contact pressures (4–6 GPa) and further on, to accelerate damage, at high contact pressuresn(10–15 GPa). The low load experiments showed various forms of surface damage with no significant differencenbetween dry and lubricated contact. Whereas, the high load experiments showed different damagenbehaviour under unlubricated and lubricated conditions. Unlubricated contact resulted in thenformation of transfer layers and Hertzian cracks on the silicon nitride surface whereas, damage undernlubricated contact was mainly dominated by grain removal and delayed crack formation. Finite elementnsimulations were carried out to study the stress state under different loading conditions. The FEM resultsnindicated that the combination of surface tensile and shear stresses predominantly influence the fatiguendamage observed in the experiments rather than fluctuating tensile stresses only.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20306 - Audio engineering, reliability analysis

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

International Journal of Fatigue

ISSN

0142-1123

e-ISSN

—

Svazek periodika

105

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

14

Strana od-do

97-110

Kód UT WoS článku

000413377900010

EID výsledku v databázi Scopus

2-s2.0-85028435178