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Title:Measurement of strain caused by residual stresses in a welded joint using neutron diffraction
Authors:Gubeljak, Nenad (Author)
Vojvodič-Tuma, Jelena (Author)
Preismeyer, Hans-Georg (Author)
Files:URL http://www.dlib.si/details/URN:NBN:SI:doc-NI1K553G
 
Language:English
Work type:Not categorized (r6)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:The distribution and amount of residual stresses can significantly contrubute to the fatigue fracture behaviour of welded joints in structures. Interior residual stresses, which interact with the plane strain state, are more dangerous than residual stresses at the surface of the welded joint. If the surface of the welded joint is mechanically treated (e.g. shapering), then significant differences between the stress stated at the surface and within the volume occur. Hence, different non-destructive methods (e.g. gamma radiation, neutron diffraction) have been developed to determine strains caused by residual stresses in the volume of polycrystalline materials. However, the measurement of strains caused by residual stresses becomes difficult for large samples. In this paper the measurement procedure on a sample taken from the weld joint is presented and the effecet of residual stresses on fatigue crack propagation is assessed for low and high cycle loading fatigue.
Keywords:zaostale napetosti, zvarni spoj, neutronski lom žarkov, utrujenostno širjenje razpoke, neutron diffraction method, residual stresses, fatigue crack propagation, weld joint
Year of publishing:1999
Publisher:Inštitut za kovinske materiale in tehnologije
Number of pages:str. 459-462
Numbering:Letn. 33, št. 6
UDC:620.179.1:539.38:621.791.05
ISSN on article:1318-0010
COBISS_ID:204202 Link is opened in a new window
NUK URN:URN:SI:UM:DK:23Z5YGFC
Views:466
Downloads:10
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Categories:Misc.
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Record is a part of a journal

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:Meritev deformacij povzročenih z zaostalimi napetostmi v zvarnem spoju na osnovi nevtronovskega odklona
Abstract:Porazdelitev in višina zaostalih napetosti lahko značilno vpliva na utrujenostno obnašanje zvarnih spojev in varjenje konstrukcije. Notranje zaostale napetosti so zaradi vzajemnega delovanja z ravninskim deformacijskim stanjem bolj nevarne od zaostalih napetosti na površini. V primeru če je površina zvarnega spoja mehansko obdelana (npr. brušena) se pojavijo izrazite razlike med zaostalimi napetostmi na površini in v notranjosti materiala. Zato so bile razvite različne neporušitvene metode (npr. gama sevanje, nevtronska difrakcija) s katerimi se določajo deformacije,ki so posledica zaostalih napetosti v polikristalnih materialih. Zaradi omejene penetracije nevtronov (do 20 mm) postaja meritev napetosti problematična pri večjih debelinah. V članku je predstavljen postopek meritve deformacij na iz zvarnega spoja izrezanih preizkušancih povzročenih z zaostalimi napetostmi in prikazan vpliv zaostalih napetosti na nizko in visokociklično utrujanje.


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