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Značilnosti realne kontaktne površine na mikro nivoju
Brodnik Žugelj, Blaž (Author), Kalin, Mitjan (Mentor) More about this mentor... This link opens in a new window

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Abstract
V splošnem strojništvu se pogoje v kontaktu računa z upoštevanjem nominalne kontaktne površine med dvema površinama, ki je bistveno večja od dejanske kontaktne površine. Upoštevanje takšne predpostavke vodi v izračun milejših kontaktnih pogojev kot so ti v resnici. V doktorski nalogi smo raziskovali vpliv inženirsko relevantnih materialov in topografskih lastnosti na dejansko obnašanje v kontaktu dveh ravnih površin pri statičnih pogojih obremenjevanja. V ta namen je bilo razvito namensko preizkuševališče, ki omogoča analizo kontakta na submikronskem nivoju. Rezultati so pokazali, da se pri makro meji tečenja kovine v kontaktu obnašajo zelo podobno, medtem ko so vidnejše razlike posledica različnih topografskih lastnosti. Nasprotno, polimer izkazuje drugačno obnašanje v kontaktu kot kovine. Podrobna eksperimentalna analiza deformacije vršičkov je pokazala, da na obnašanje v kontaktu pomembno vplivajo tako mehanske kot tudi geometrijske spremembe kontaktnih vršičkov. Dobljene eksperimentalne rezultate smo primerjali z najbolj uveljavljenih teoretičnih modelov za napovedovanje obnašanja v kontaktu. Zaradi predpostavk teoretičnih modelov prihaja do vidnejših odstopanj v primerjavi z dejanskim obnašanjem v kontaktu.

Language:Slovenian
Keywords:Kontakt ravnih površin Realna kontaktna površina Deformacija vršičkov Eksperimentalna in-situ analiza Materialne lastnosti Topografija površin
Work type:Doctoral dissertation (mb31)
Organization:FS - Faculty of Mechanical Engineering
Year:2017
Views:513
Downloads:493
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Secondary language

Language:English
Title:Real contact area characteristics on the micro scale
Abstract:
In conventional engineering approach, contact conditions are calculated with the assumption of nominal contact area between two surfaces, which is greater than actual contact area. Consideration of such assumptions leads into calculations of milder contact conditions as they appear in real. In this PhD thesis we investigated the influence of engineering-relevant material and topographic properties on the actual behaviour within the contact of two nominally flat surfaces under static loading conditions. For this purpose, a novel test rig was developed, which enables the analysis of the contact on a submicron scale. The results showed that at the macro yield stress metals exhibit similar contact behaviour, while the influence of topographic properties is more prominent. On the contrary, polymer shows different contact behaviour than metals. In-depth experimental analysis of asperity deformations showed that the contact behaviour is strongly affected by the material and topographic changes of the contacting asperities. The obtained experimental results were compared to the predictions of well-established theoretical contact models. Due to the assumptions of theoretical contact models, large deviations between the predicted and actual contact behaviour were observed.

Keywords:Contact of two nominally flat surfaces Real contact area Asperity deformations Experimental in-situ analysis Material properties Surface topography

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