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1.
Fatigue crack initiation from microstructurally small Vickers indentations
Tomaž Vuherer, Andrej Godina, Zijah Burzić, Vladimir Gliha, 2007, izvirni znanstveni članek

Opis: The resistivity of coarse grain steel against crack initiation in the presence of micro defects is discussed. Samples of material with martensitic microstructure were prepared by adequate thermal treatment. Microstructurally small Vickers indentations were used as an artificial micro defect. The compressive residual stresses are due to the irreversibility of plastic deformation. The moment of indenting enables to prepare samples with and without effects of residual stresses. The stress level for crack initiation depends on the actual indentation size. The location of initiated cracks is affected by the presence and character of residual stresses.
Ključne besede: welded joints, micro defect, coarse grain HAZ, crack initiation, crack growth, stress concentration, fatigue limit, Vickers, residual stresses
Objavljeno: 03.07.2017; Ogledov: 673; Prenosov: 84
.pdf Celotno besedilo (1,02 MB)
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2.
Behaviour of coarse grain heat affected zone (HAZ) during cycle loading
Tomaž Vuherer, P. O. Maruščak, Ivan Samardžić, 2012, izvirni znanstveni članek

Opis: This paper presents results of a study on martensitic coarse grain heat affected zone that can appear in welded joints. Mechanical properties of martensitic coarse grain heat affected zone and its microstructure were investigated. Special attention was given to its behaviour during the cycle loading under stress concentration. Stress concentration was similar to the one in real welds. The S-N curve and the fatigue limit were determined. The Paris curve and the threshold for crack propagating were also determined.
Ključne besede: welded joints, coarse grain HAZ, microstructure, fatigue limit, Paris curve
Objavljeno: 01.06.2012; Ogledov: 1194; Prenosov: 72
.pdf Celotno besedilo (359,02 KB)
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