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Title:Modificirano numerično modeliranje lomnega vedenja zvarnega spoja v prehodnem področju iz duktilnega h krhkemu lomu
Authors:ID Kozak, Dražan (Author)
ID Gubeljak, Nenad (Author)
ID Rak, Inoslav (Author)
Files:URL http://www.dlib.si/details/URN:NBN:SI:doc-JB8G3BW6
 
Language:Slovenian
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:Varno obratovanje varjene konstrukcije je odvisno od lomno mehanskih lastnosti zvarnih spojev. Največje spremembe teh lastnosti nastopajo v prehodnem področju iz duktilnega v krhki lom. Namen tega raziskovalnega dela je z metodo končnih elementov definirati primeren numerični postopek za izračun napetostno-deformacijskega stanja v trenutku nestabilnega loma. Uporabljen modificirani postopek numeričnega modeliranja mora omogočiti vedenje materiala zvara na konici razpoke v sksladu s teorijo nastanka in širjenja duktilne oziroma cepilne razpoke ter zagotoviti verifikacijo z eksperimentalnimi rezultati. Uporaba ravninskega deformacijskega stanja na konici razpoke ob ravninsko napetostnem stanju preostalega preizkušanca med sukcesivnim obremenjevanjem omogoča dobro korelacijo med eksperimentalnimi in numeričnimi rezultati. Na osnovi tega je možno definirati pogoje sprožanja nestabilnega loma v poljubno oblikovanem modelu, kakor tudi določiti prag za varno obratovanje dejanske varjene konstrukcije v prehodnem področju iz duktilnega v krhki lom.
Keywords:zvarni spoj, metoda končnih elementov, lomna žilavost CTOD, krhki cepilni lom, omejitev
Publisher:Inštitut za kovinske materiale in tehnologije
Year of publishing:1998
Number of pages:str. 337-342
Numbering:Letn. 32, št. 5
PID:20.500.12556/DKUM-53285 New window
UDC:539.42:539.55:621.791.052:669.14.018.298
ISSN on article:1318-0010
COBISS.SI-ID:81066 New window
NUK URN:URN:SI:UM:DK:UCFPIGKK
Publication date in DKUM:10.07.2015
Views:1420
Downloads:62
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
KOZAK, Dražan, GUBELJAK, Nenad and RAK, Inoslav, 1998, Modificirano numerično modeliranje lomnega vedenja zvarnega spoja v prehodnem področju iz duktilnega h krhkemu lomu. Kovine zlitine tehnologije [online]. 1998. Vol. 32, no. 5, p. 337–342. [Accessed 27 March 2025]. Retrieved from: http://www.dlib.si/details/URN:NBN:SI:doc-JB8G3BW6
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Title:Kovine zlitine tehnologije
Shortened title:Kovine zlit. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1318-0010
COBISS.SI-ID:31742209 New window

Secondary language

Language:English
Title:Modified numerical modelling of fracture behaviour of weld joint in ductile-to-brittle temperature transition region
Abstract:Safe use of welded structure depends on fracture mechanics properties of weld joints. These properties are change significantly in the ductile-to-brittle temperature transition region. The aim of this research was to determine an appropriate numerical modelling procedure to define stress-strain conditions at the moment of instability. The modified procedure enables to the fracture behaviour of weld metal at the crack tip in accordance with the theory of fracture mechanics and ensures the verification with experimental results. The use of modified plain stress state at the crack tip during successive increasing of loading enables to obtain acceptable agreement between experimental and numerical results. By FE calculated stress-strain situation at the moment of unstability corresponds to the local condition at the initiation of cleavage fracture on testing specimens. It is possible to use this results on different models for the treshold determination of safe load for real welded structures in the ductile-to-brittle temperature transition region.
Keywords:weld joint, finite element method, CTOD fracture toughness, brittle cleavage fracture, constraint


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