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Title:Določevanje hitrosti širjenja utrujenostne razpoke v zvarnem spoju pri majhnih prirastkih
Authors:ID Predan, Jožef (Author)
ID Gubeljak, Nenad (Author)
ID Oblak, Maks (Author)
ID Legat, Janko (Author)
ID Inštitut za kovinske materiale in tehnologije (Copyright holder)
Files:.pdf Materiali_in_tehnologije_2002_Predan_et_al._Dolocevanje_hitrosti_sirjenja_utrujenostne_razpoke_v_zvarnem_spoju_pri_majhnih_prirastkih.pdf (186,33 KB)
MD5: DC3847112DF8AAA002491BAB02C25E22
PID: 20.500.12556/dkum/5101bea0-c46e-4e68-9f4c-f9d6c5f2130e
 
URL http://mit.imt.si/Revija/izvodi/mit025/predan.pdf
 
Language:Slovenian
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:Standardi in dokumenti za določitev hitrosti širjenja razpoke predvidevajo uporabo standardnih preizkušancev, na katerih je mogoče meriti dolžino razpoke od nekaj deset do nekaj sto milimetrov prirastka. Problem postaja težaven pri zvarnih spojih, kadar se merijo prirastki razpoke na skupni razdaljile nekaj milimetrov. Za to so poglavitni razlogi naslednji: utrujanje poteka z relativno nizko amplitudo faktorja intenzitete napetosti v področju utrujenostnega praga, mikro strukturna in trdnostna heterogenost zvarnega spoja, zaostale napetosti kot posledica varjenja, med utrujanjem se način odpiranja razpoke lokalno spreminja iz enoosno nateznega na ravninsko strižno in nasprotno. Omenjeni dejavniki se kažejo z izrazito neurejeno sliko hitrosti širjenja utrujenostne razpoke. V prispevku je opisan postopek za predobdelavo eksperimentalno izmerjenih vrednosti (prirastek razpoke, št. nihajev), ki omogoča zanesljivejšo določitev hitrosti širjenja utrujenostne razpoke v zvarnem spoju za majhne prirastke do zloma, ko faktor intenzitete napetosti preseže lomno žilavost.
Keywords:zvarni spoji, utrujenostna razpoka, faktor intenzivnosti napetosti, prag
Publication status:Published
Publication version:Version of Record
Year of publishing:2002
Number of pages:str. 201-206
Numbering:Letn. 36, št. 5
PID:20.500.12556/DKUM-27871 New window
ISSN:1580-2949
UDC:621.791.05:620.178.3:539.55
ISSN on article:1580-2949
COBISS.SI-ID:7482390 New window
NUK URN:URN:SI:UM:DK:HIAGXNTH
Publication date in DKUM:01.06.2012
Views:2207
Downloads:118
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
PREDAN, Jožef, GUBELJAK, Nenad, OBLAK, Maks and LEGAT, Janko, 2002, Določevanje hitrosti širjenja utrujenostne razpoke v zvarnem spoju pri majhnih prirastkih. Materiali in tehnologije [online]. 2002. Vol. 36, no. 5, p. 201–206. [Accessed 26 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=27871
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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:Determining the fatigue crack growth rate in welded joints for small fatigue crack extension
Abstract:Standards and documents for determining crack growth rate envisage the use of standard specimens on which it is possible to measure the length of a crack from around ten to around a hundred millimeters. The problem becomes difficult in welding joints in the case when a crack length increment is measured on the total distance of just a few millimeters. The main reasons are follows: - the fatigue is performed at a relatively low amplitude stress intensity level in the region of the threshold; - the microstructure and the strength heterogeneity of the welding joint; - the residual stresses as an effect of welding a consequence of the welding process; - the local change of load modes from one-axis tensile stress to plane shear stress and vice versa. The above-mentioned factors are reflected in the results with a clearly disarranged dependence on fatigue-crack growth rate. This paper outlines a procedure for the pre-processing of experimentally measured values (crack-length increment, number of cycles) to make it possible to more reliably determine fatigue-crack growth rate in the welding joint for a low crack-length increment.
Keywords:welded joints, fatigue crack, stress intensity factor, threshold


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