Critical plane modelling of fatigue initiation under rolling and sliding contact

Matjaž Šraml (Avtor), Jože Flašker (Avtor), Iztok Potrč (Avtor)

Povzetek

Contact fatigue is a phenomenon of important practical significance for engineering applications involving localized contacts, such as gears, rail wheel system and rolling bearings. The service lifetime of such components is related to damage, which results from the contact fatigue. The process in the material structure that causes this kind of failure is quite complicated. The aim of the present paper is to describe a contact fatigue initiation criterion, based on the critical plane approach for the general contact problem. On the basis of contact stress analysis with modified Hertzian boundary conditions, the loading cycle of characteristic material points in the contact area is determined. The Dang Van damage initiation criterion is based on the critical plane approach, which combines the largest allowable shearing and hydrostatic stresses (tensile and compressive), with an assumed elastic shakedown behaviour and it is used in this work. The material point of initial fatigue damage is then determined at the transition of the loading cycle stresses over the critical plane. The model assumed a homogeneous and elastic material model, without any imperfections or residual stresses, and elastic shakedown is considered. A proper determination of loading cycles and their characteristic values is of significance for contact fatigue initiation analysis. Finally, determination of the most critical material point on or under the contact surface and related number of loading cycles required for fatigue damage initiation is calculated with the strain-life (▫$\epsilon$▫-N) method.

Ključne besede

strojni elementi;kontaktna utrujenost;nastanek razpoke;deformacijska metoda;kriterij kritične ravnine;numerično modeliranje;machine elements;contact fatigue;crack initiation;strain life method;critical plane approach;numerical modeling;

Podatki

Jezik:	Angleški jezik
Leto izida:	2004
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UM FS - Fakulteta za strojništvo
UDK:	621.833:539.388.1
COBISS:	8655126
ISSN:	0309-3247
Št. ogledov:	1560
Št. prenosov:	96
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarne ključne besede:	strojni elementi;kontaktna utrujenost;nastanek razpoke;deformacijska metoda;kriterij kritične ravnine;numerično modeliranje;
URN:	URN:SI:UM:
Strani:	str. 225-236
Letnik:	ǂVol. ǂ39
Zvezek:	ǂno ǂ2
Čas izdaje:	2004
ID:	8718691