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Tokovne lastnosti kompozitov polipropilena z različnimi koncentracijami feritnih delcev - primerjava eksperimentalnih vrednosti s teoretičnimi modeli : zaključna naloga Razvojno raziskovalnega programa I. stopnje StrojništvoŠtrubelj, FabijanPolimerni kompoziti z magnetnimi delci so mešanice, sestavljene iz termoplastov z dodanimi aditivi in različnimi prahovi z magnetnimi lastnostmi. Uporabljajo se za izdelavo vezanih magnetov, pri ... čemer polimer deluje kot vezivo, ki povezuje magnetne delce v želeno obliko. Zaradi zagotavljanja čim boljših magnetnih lastnosti, se pri tovrstnih materialih teži k čim večjemu deležu magnetnega prahu. Z večanjem deleža polnitve viskoznost narašča, kvalitetno brizganje taline postaja vedno težje, ohlajeni končni izdelki postajajo vse bolj krhki. V tem delu smo analizirali viskoznost visokopolnjenega polipropilena z različnimi deleži prahu stroncijevega ferita. Iz literature smo izbrali različne modele za napovedovanje strižno odvisne viskoznosti v odvisnosti od deleža trdnih delcev. Primerjali smo eksperimentalno dobljene vrednosti z izračuni ter izbrali model, ki najbolje opisuje obravnavane materiale. Ugotovili smo, da viskoznost narašča s povečevanjem deleža ferita. Meja prvega newtonskega območja viskoznosti se pri tem pomika k nižjim strižnim hitrostim. Odstopanja modelov od meritev so zelo odvisna od strižne hitrosti, pri kateri so bile meritve izvedene. Pri strižni hitrosti 1,06 1/s viskoznost najbolje napove Krieger-Doughtery-jev model in pri 10,6 1/s Chong-ov model.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [F. Štrubelj], 2020Language - slovenianCOBISS.SI-ID - 28838915
Author
Štrubelj, Fabijan
Other authors
Slemenik Perše, Lidija
Topics
diplomske naloge |
tokovne lastnosti |
strižno upadanje viskoznosti |
stroncijev ferit |
polipropilen |
tokovni modeli |
thesis |
flow properties |
shear thinning |
strontium ferrite |
polypropylene |
flow models
Library/institution |
City | Acronym | For loan | Other holdings |
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Faculty of Mechanical Engineering, Ljubljana | Ljubljana | FSLJ |
reading room 1 cop.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Štrubelj, Fabijan | |
Slemenik Perše, Lidija | 22701 |
Source: Personal bibliographies
and: SICRIS
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