Žilinská univerzita v Žiline

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    Barkhausenov šum po dynamickom guľôčkovaní duplexnej ocele AlSi 318
    (University of Žilina, 2024) Mičietová, Anna; Uríček, Juraj; Čilliková, Mária; Neslušan, Miroslav
    This paper deals with surface integrity and the corresponding Barkhausen noise after shot peening of duplex steel AlSi 318 under variable shot-peening conditions such as number of passes and applied air pressure. Surface state is investigated from the point of view of surface roughness and surface plastic deformation. Barkhausen noise is decreasing along with increasing surface coverage as well as increasing air pressure. The duplex matrix is considered being stable with respect of volume fraction between austenite and ferrite and the whole Barkhausen noise signal originates from ferromagnetic ferrite. Progressively developed plastic deformation increases dislocation density in the surface as a result of surface bombardment by shots which in turn shift Barkhausen envelopes into higher magnetic fields.
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    Interpretácia nových pravidiel pre používanie požiadaviek pre charakter povrchu - profil
    (University of Žilina, 2024) Bronček, Jozef; Konstantová, Viera; Drbúl, Mário
    The international standard STN EN ISO 21920-1 specifies the rules and methodology for marking the character of the surface profile by profile methods in the technical documentation of the product using graphic marks. The aim of the article is to familiarize the public with the content of the standard included in the Geometrical Product Specification (GPS) system. The changes in the area of default settings concern the introduction of new rules for acceptance of tolerance. The rules determine how the tolerance limits are applied to the measured values of the parameters. The introduced changes benefit the majority of users for prescribing, manufacturing and checking product requirements.