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Title:The effect of a material's heterogeneity on the stress and strain distribution in the vicinity of a crack front
Authors:ID Kozak, Dražan (Author)
ID Gubeljak, Nenad (Author)
ID Vojvodič-Tuma, Jelena (Author)
Files:.pdf Materiali_in_Tehnologije_2007_Kozak,_Gubeljak,_Tuma_The_effect_of_a_material_s_heterogeneity_on_the_stress_and_strain_distribution_in_th.pdf (575,99 KB)
MD5: 5E5C93FA6DD7B86C4144A28E5142FACE
 
URL http://mit.imt.si/Revija/izvodi/mit071/kozak.pdf
 
Language:English
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:In this investigation a high-strength low-alloyed (HSLA) steel of the 700-MPa strength class was used as a base material. A butt-welded joint with X grooves was produced with an overmatched weld metal that had a yield strength 23 % greater than that of the base material. Three-point bending B x 2B test specimens (thickness B = 36 mm) were extracted from the welded joints. The straight crack front (a0 = 35,571 mm) crosses different microstructures through the thickness of the specimen. Both fracture-mechanics tests and a 3D finite-element analysis were performed. The CTOD parameter of the fracture toughness was measured and calculated numerically. The loading level at which stable crack growth occurred was also determined. The comparison of the experimental and numerical values of the CTOD (bs) displacements showed good agreement. The principal stress, /deltay, the Mises equivalent stress, /deltaeq. and the plastic equivalent strain, /epsilonpl,eq, at the moment of crack initiation were studied for six equidistant layers from the surface to the mid-thickness of the specimen. The dependence of the crack-opening stress (denoted as ax in this paper) on the local fracture-toughness value was considered as the parameter which determines the direction of the crack-front propagation. The results show that the lower strength of the base metal contributes to the crack-path deviation in the mid-thickness of the specimen. Both the crack-path deviation and the higher toughness of the base metal increase the critical fracture toughness value of the welded joint.
Keywords:trdnost spoja z večjo trdnostjo vara, razpoka, porazdelitev napetosti, porazdelitev deformacij, analiza končnih elementov
Publication status:Published
Publication version:Version of Record
Year of publishing:2007
Number of pages:str. 41-46
Numbering:Letn. 41, št. 1
PID:20.500.12556/DKUM-52807 New window
ISSN:1580-2949
UDC:539.42:620.17
ISSN on article:1580-2949
COBISS.SI-ID:11145494 New window
NUK URN:URN:SI:UM:DK:NBBEEGJ5
Publication date in DKUM:10.07.2015
Views:1377
Downloads:114
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
KOZAK, Dražan, GUBELJAK, Nenad and VOJVODIČ-TUMA, Jelena, 2007, The effect of a material’s heterogeneity on the stress and strain distribution in the vicinity of a crack front. Materiali in tehnologije [online]. 2007. Vol. 41, no. 1, p. 41–46. [Accessed 25 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=52807
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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:Vpliv heterogenosti materiala na porazdelitev napetosti in deformacije v bližini razpoke
Abstract:V tej raziskavi je bilo kot osnovni material uporabljeno visokotrdno malolegirano jeklo (HSLA) s trdnostjo 700 MPa za čelni zvar z X-žlebovi je bil pripravljen in uporabljen deponirani material z mejo plastičnosti, ki je bila za 23 % večja kot pri osnovnem materialu. Tri-točkovni upogibni preizkušanci B x 213 (debelina B = 36 mm) so bili izrezani iz zvarjenega spoja. Čelo ravne razpoke (a0 = 35,571 mm) seka skozi debelino preizkušanca različne mikrostrukture. Opravljeni so bili lomnomehanski preizkusi in analiza 3D končnih elementov. CTOD-parameter mehanike loma je bil izmerjen in numerično izračunan. Določen je bil tudi nivo obremenitve, pri katerem je nastala stabilna rast razpoke. Primerjava eksperimentalnih in numeričnih vrednosti za CTOD (65)-premike je pokazala dobro ujemanje. Glavna napetost /delta_y, ekvivalentna Mises-napetost /delta_eq in ekvivalentna plastična deformacija /epsilon_ok-e] so bile opredeljene za 6 med seboj enako oddaljenih plasti od površine do sredine preizkušanca. Odvisnost med napetostjo odprtja razpoke (označeno z /delta_x v tem članku) in lokalno vrednostjo za žilavost loma je upoštevana kot parameter, ki določa smer propagacije čela razpoke. Rezultati kažejo, da manjša trdnost osnovnega materiala povzroči deviacijo poteka razpoke v sredini preizkušanca. Deviacija poti razpoke in večja žilavost osnovnega materiala povečata žilavost loma zvarnega spoja.
Keywords:strength overmatched welded joint, crack, stress distribution, strain distribution, finite element analysis


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