Vladimir Gliha (Author), P. O. Maruščak (Author), Tomaž Vuherer (Author)

Abstract

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.

Keywords

small defect;drilled hole;crack initiation;crack propagation;short crack;long crack;anomalous fast-crack propagation;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 621.7.019.1
COBISS: 17043478 Link will open in a new window
ISSN: 1580-2949
Parent publication: Materiali in tehnologije
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Other data

Secondary language: Slovenian
Secondary title: Vedenje kratkih razpok, ki nastanejo iz majhnih izvrtin
Secondary abstract: Pri preizkušancih z martenzitno mikrostrukturo smo naredili majhne izvrtine z obstoječimi lokalnimi zaostalimi napetostmi zaradi vrtanja in brez njih. Namen te raziskave je bilo določiti odvisnost ciklične napetosti, ki je potrebna za nastanek razpoke, in odvisnost trajne dinamične trdnosti z izvrtino oslabljenih in gladkih preizkušancev, od polja zaostalih napetosti. Tlačne zaostale napetosti so zavrle nastanek razpoke. Takoj po nastanku razpoke so zaostale napetosti upočasnile širjenje kratke razpoke, pozneje, ko se je predznak napetosti spremenil, pa so ga pospešile. Velikost kratke razpoke, ki se ne širi več, in trajna dinamična trdnost sta prav tako odvisni od polja zaostalih napetosti.
Secondary keywords: materiali;napake;razpoke;izvrtina;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Pages: str. 441-446
Volume: ǂLetn. ǂ47
Issue: ǂšt. ǂ4
Chronology: jul.-avg. 2013
Keywords (UDC): mathematics;natural sciences;naravoslovne vede;matematika;physics;fizika;physical nature of matter;fizikalna zgradba snovi;strength;resistance to stress;trdnost;trdnost pri obremenitvah;
ID: 1439590