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Title:Vpliv umetnih površinskih napak na dinamično trdnost materiala na prehodu temena vara
Authors:Gliha, Vladimir (Author)
Inštitut za kovinske materiale in tehnologije (Authorship owner)
Files:.pdf Materiali_in_tehnologije_2001_Gliha_Vpliv_umetnih_povrsinskih_napak_na_dinamicno_trdnost_materiala_na_prehodu_temena_vara.pdf (193,49 KB)
 
URL http://mit.imt.si/Revija/izvodi/mit0112/gliha.pdf
 
Language:Slovenian
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:Dinamično obremenjeni kakovostni soležni zvarni spoji se porušijo zaradi utrujenosti materiala na prehodu temena vara v osnovni material. Pri tem je pomembna tudi prisotnost inicialnih mikro napak. Vzorce materiala TVP smo pripravili na simulatorju termičnega cikla. Iz njih smo izdelali preizkušance z žlebom in umetnimi površinskimi inicialnimi mikronapakami. Na dnu žleba je bila koncentracija napetosti približno takšna kot pri zvarnih spojih. Inicialne mikronapake so bili posamični odtisi in nizi odtisov Vickersove piramide. Pri analizi rezultatov smo upoštevali termične parametre pri varjenju in mehanske lastnosti. Rezultate sme primerjali z dinamičnimi lastnostmi, ko ni vpliva inicialnih mikro napak. Z manjšanjem hitrosti ohlajanja, ki je posledica večjega vnosa toplote pri varjenju, dinamična trdnost materiala z inicialnimi mikronapakami pada, ob tem pa linearno raste s statično trdnostjo.
Keywords:varjenje, soležni zvarni spoji, dinamične obremenitve, utrujenost materiala, trdnost, mikro napaka, odtis Vickersove piramide, prehod temena vara, produktivno varjenje
Year of publishing:2001
Number of pages:str. 61-64
Numbering:št. 1/2, Letn. 35
ISSN:1580-2949
UDC:621.791.05:669.14.018.298:620.178.3
ISSN on article:1580-2949
COBISS_ID:6213142 Link is opened in a new window
NUK URN:URN:SI:UM:DK:MMUSTH7J
Views:1419
Downloads:57
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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:English
Title:The influence of artificial surface defects on the fatigue strength of material at the weld toe
Abstract:Dynamically loaded high-quality butt-weld joints fail due to fatigue of the material at the weld toe. Initial microdefects present in that material are important too. Samples of HAZ materials were prepared on the therml cycle simulator. Specimens with a groove and an artificial surface of initial microdefects were made from these samples. Stress concentration at the bottom of the groove was approximately the same as at the actual welded joints. Initial micro-defects were single and series indentations of the Vickers pyramid. In the analysis of results, parameters of the welding and mechanical properties were taken into account. Results were compared with those from samples without any influence of initial microdefects. The decreasing cooling rate that is a consequence of the higher heat input by welding fatigue strength of material with initial micro defects is decreasing while the fatiguestrength is linearly increasing with ultimate tensile strength.
Keywords:welding, butt welded joint, dynamic loads, material fatigue, strength, micro defects, Vickers pyramid indentation, weld toe, productive welding


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