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Title:ANALIZA DOBE TRAJANJA ALUMINIJASTEGA TEČAJA HLADILNEGA APARATA
Authors:ID Fujs, Slavko (Author)
ID Ren, Zoran (Mentor) More about this mentor... New window
ID Glodež, Srečko (Comentor)
Files:.pdf SPEC_Fujs_Slavko_2011.pdf (3,77 MB)
MD5: 6A4A6BC5D975B253B01E6846FB6A6880
PID: 20.500.12556/dkum/3e4c72e0-dc27-485b-b363-94594ad31300
 
Language:Slovenian
Work type:Specialist thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:V praksi se je pokazalo, da prihaja pogosto do loma odlitega aluminijastega tečaja na hladilno-zamrzovalnem aparatu. Tečaj je del omejilca vrat, ki ima funkcijo omejevanja odpiranja vrat samo do določenega kota. Zaradi tega prihaja do občasnih sunkovitih obremenitev na tečaju, kar pa ima velik vpliv na življenjsko dobo tečaja. Glavni razlog za lomljenje tečaja je v vtisnjenem narebričenem sorniku v tečaj, kateri povzroča iniciranje razpoke. V delu se iz tega razloga narebričeni sornik zamenja z krčnim nasedom med sornikom ter tečajem. Prikazana je analiza deformacijsko-napetostnega stanja tečaja hladilno-zamrzovalnega aparata z upoštevanjem tako razmer v spoju krčnega naseda, kakor tudi vseh obremenitev, ki nastanejo pri odpiranju vrat aparata, z uporabo numeričnega postopka po metodi končnih elementov ter analitično določitvijo življenjske dobe tečaja. Na osnovi referenčnega numeričnega modela krčnega naseda, katerega smo kontrolirali z rezultati analitične analize, je bil zgrajen numerični model tečaja za obremenitveni primer zunanjih obremenitev ter posebej za obremenitev v krčnem nasedu. Rezultati numerične analize tečaja so bili osnova za določitev življenjske dobe tečaja po napetostni metodi. Zamenjava načina spoja sornika s tečajem, se je pokazala kot zelo primerna glede na življenjsko dobo, saj je analitična določitev življenjske dobe tečaja s krčnim nasedom pokazala precej daljšo življenjsko dobo v primerjavi z narebričenim sornikom iz praktičnega testiranja.
Keywords:hladilno-zamrzovalni aparat, tečaj iz Al-zlitine, omejilec vrat, obremenitve, krčni nased, računalniške simulacije, metoda končnih elementov, doba trajanja
Place of publishing:Maribor
Publisher:[S. Fujs]
Year of publishing:2011
PID:20.500.12556/DKUM-19082 New window
UDC:519.61/.64:[539.42:621.888.2]
COBISS.SI-ID:15207702 New window
NUK URN:URN:SI:UM:DK:ER43F1HQ
Publication date in DKUM:27.07.2011
Views:2441
Downloads:250
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Secondary language

Language:English
Title:FATIGUE ANALYSIS OF ALUMINIUM REFRIGERATOR HINGE
Abstract:Practice has shown, that it often comes to fracture of cast aluminum hinge in the refrigerator-freezer appliance. Hinge is a part of a door-stop, which has the function of restricting the opening of the door, only to a certain angle. This leads to occasional shock loads on the hinge, which has a major impact on the hinge fatigue. The main reason for hinge break is in knurled pin impressed in the hinge, which leads to cracks initiation. For this reason in this individual work the knurled pin was replaced with a shrink fit between the pin and hinge. The work shows the analysis of strain-stress hinge state of refrigerator-freezer appliance with regard to conditions in the shrink fit joints, as well as all loads, incurred by opening the door of appliance, using numerical procedure with finite element and analytical determination of the hinge fatigue. Based on the numerical reference model of shrink fit, which we inspected with the results of the analytical analysis, the numerical model was constructed for the load case with the external loads, and especially for a load case with shrink fit. The results of numerical analysis for the hinge have been the basis for determining the hinge fatigue according to the stress method. Changing the way of pin coupling, with the hinge, from the knurled pin to shrink fit, showed to be very appropriate from lifetime aspect, because the analytical determination of the hinge lifetime, showed a much longer lifespan compared to knurled pin which was tested practically.
Keywords:fridge-freezer appliance, hinge of Al-alloy, door-stop, loads, shrink fit, computer analysis, finite element method, fatigue


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