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Title:An integrity analysis of washing machine holders
Authors:Gubeljak, Nenad (Author)
Mejač, Matej (Author)
Predan, Jožef (Author)
Files:.pdf Materiali_in_Tehnologije_2007_Gubeljak,_Mejac,_Predan_An_integrity_analysis_of_washing-machine_holders.pdf (517,04 KB)
 
URL http://mit.imt.si/Revija/izvodi/mit071/gubeljak.pdf
 
Language:English
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:The paper deals with structure integrity analysis of the holder for the carrying cross of a washing machine drum. Premature fracture of the holder occurred between mechanical sustainable tests of washing machine in the factory. In order to prevent fracture, the task was to determine the reasons for premature fracture of the holder and to estimate the suitability of the new design of the holder cross. Input data for structure integriry analysis were obtained by material by mechanical testing of used materials. Stress and strain analysis of holder limit load was performed by finite element modeling of holder. Dynamic tests of holders with two different thicknesses were done on a servo-hydraulic machine in order to find dynamical strength and endurance of holder. Fracture behaviour of holders is defined as initiation and propagation of crack. The obtained behaviour confirmed that the new design of holders reduces stress concentration in the critical region. Consequently, the new holder subjected to the same dynamic load can endure a higher number of cycles until breakage. The total number of cycles overcomes industrial testing requirements.
Keywords:lomna mehanika, visokociklično utrujanje, preizkušanje lomne žilavosti, nosilci kadi pralnega stroja, mejna obremenitev, ocena celovitosti konstrukcije, fracture mechanics, high cycle fatigue, fracture toughness testing, washing machine holders, washing machine drums, structure integrity assessment, limit load
Year of publishing:2007
Number of pages:str. 35-40
Numbering:Letn. 41, št. 1
ISSN:1580-2949
UDC:539.42:620.17
ISSN on article:1580-2949
COBISS_ID:11139350 Link is opened in a new window
NUK URN:URN:SI:UM:DK:SQ26JVEI
Views:572
Downloads:47
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Secondary language

Language:Slovenian
Title:Analiza celovitosti nosilca kadi v pralnem stroju
Abstract:V članku je predstavljena analiza celovitosti križnega nosilca kadi pralnega stroja. Predčasna porušitev nosilca je nastopila med mehanskim preizkušanjem pralnega stroja v podjetju. Z namenom, da se prepreči predčasna porušitev nosilca, so bili raziskani vzroki za porušitev in ocenjena je bila primernost nove zasnove nosilca križa kadi pralnega stroja. Vhodni podatki za oceno celovitosti so bili dobljeni na osnovi mehanskih preizkusov materialov. Napetostna in deformacijska analiza nosilca pri mejnem stanju obremenitve je bila opravljena z numeričnim modeliranjem in izračunom po metodi končnih elementov. Dinamični preizkusi dveh nosilcev z različnima debelinama ob enakem vpetju, kot je to v pralnem stroju, so bili opravljeni na servohidravličnem preizkuševalnem stroju. Na osnovi opravljenih preizkusov je bila določena dinamična trdnost in vzdržljivost nosilcev. Lomno vedenje nosilcev je bilo ocenjeno glede na lomno žilavost materiala med utrujenostno rastjo razpoke kot tudi glede na iniciacijo končnega, nestabilnega loma nosilca. Dobljeni rezultati potrjujejo, da nova zasnova nosilca z debelino t = 2,5 mm namesto t = 1,5 mm ob posledično spremenjenem polmeru zakrivljenosti zmanjša koncentracijo napetosti v kritičnem delu. Tako je pokazano, da novi nosilec pod enako obratovalno obremenitvijo prestane večje število ciklov do končne porušitve, kot je predpisano za preizkuse pri preverjanju kontrole kakovosti v podjetju.
Keywords:ocena celovitosti konstrukcij, preizkušanje lomne žilavosti, visokociklično utrujanje, nosilec kadi pralnega stroja


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