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1.
Behaviour of short cracks emanating from tiny drilled holes
Vladimir Gliha, P. O. Maruščak, Tomaž Vuherer, 2013, izvirni znanstveni članek

Opis: Specimens with martensitic microstructure were defected by tiny drilled holes with the existing local residual stresses induced by drilling and without them. The objective of this research was to determine the cyclic stress level for the crack initiation and fatigue limit of the defected and smooth specimens' dependence upon the residual-stress field. Compressive residual stresses retarded the crack initiation. Immediately after the crack initiation, residual stresses decelerated the short-crack propagation, but later, when the residual-stress sign was changed, they accelerated it. Non-propagating short-crack size and fatigue limit also depend on the residual-stress field.
Ključne besede: small defect, drilled hole, crack initiation, crack propagation, short crack, long crack, anomalous fast-crack propagation
Objavljeno v DKUM: 10.07.2015; Ogledov: 994; Prenosov: 104
.pdf Celotno besedilo (1,42 MB)
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2.
Evaluation of the service life of gears in regrad to surface pitting
Srečko Glodež, Boris Aberšek, Jože Flašker, Zoran Ren, 2004, izvirni znanstveni članek

Opis: A computational model for determining the service life of gear teeth flanks in regard to surface pitting is presented. The model considers the material fatigue process leading to pitting, i.e. the conditions required for the short fatigue crack propagation originating from the initial crack in a single material grain. In view of small crack lengths observed in surface pitting, the simulation takes into account the short crack growth theory. The stress field in the contact area and the required functional relationship between thestress intensity factor and the crack length are determined by the finite element method. An equivalent model of two contacting cylinders is used for numerical simulations of crack propagation in the contact area. On the basis of numerical results, and with consideration of some particular material parameters, the probable service life period of contacting surfaces is estimated for surface curvatures and loadings that are most commonly encountered in engineering practice.
Ključne besede: machine elements, gears, pitting, fatigue, short crack growth, numerical analysis, service life
Objavljeno v DKUM: 01.06.2012; Ogledov: 1966; Prenosov: 32
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