Print Email Facebook Twitter A method for determining the constitutive model of the heat-affected zone using digital image correlation Title A method for determining the constitutive model of the heat-affected zone using digital image correlation Author Yan, R. (TU Delft Steel & Composite Structures) Xin, Haohui (Xi’an Jiaotong University) Yang, Fei (Chang'an University) El Bamby, H. (TU Delft Steel & Composite Structures) Veljkovic, M. (TU Delft Steel & Composite Structures) Mela, Kristo (Tampere University) Date 2022 Abstract The heat-affected zone (HAZ) is an unmelted region of a welded joint that has changed in material properties because of high temperatures during the welding process. HAZ has a lower strength than the base (parent) material (BM) and the weld metal (WM). The lower material strength is more significant if BM is made of high strength steel and the undermatching filler metal is used. Therefore, the constitutive model of HAZ is essential for predicting the mechanical behaviour of the welded joint. In this paper, a method for determining the true stress–strain relationship of HAZ is proposed. The effect of the transverse constraint on the longitudinal deformation of HAZ imposed by BM and/or WM is eliminated by a linear modification factor correlating to the true strain. Standard tensile coupon tests were used to obtain the constitutive model of HAZ using digital image correlation (DIC). The modification factor proposed for reducing the true stress is calibrated based on finite element analysis (FEA). The modified constitutive model of HAZ is validated against the experimental results obtained by DIC. The validated HAZ material property can be used in advanced numerical simulation of welded joints. Subject Constitutive modelDigital image correlationHeat-affected zoneHigh strength steelsWelded coupon test To reference this document use: http://resolver.tudelft.nl/uuid:1aff139d-d765-48fd-bb00-b978c9bda7b5 DOI https://doi.org/10.1016/j.conbuildmat.2022.127981 ISSN 0950-0618 Source Construction and Building Materials, 342 Part of collection Institutional Repository Document type journal article Rights © 2022 R. Yan, Haohui Xin, Fei Yang, H. El Bamby, M. Veljkovic, Kristo Mela Files PDF 1_s2.0_S0950061822016506_main.pdf 5.79 MB Close viewer /islandora/object/uuid:1aff139d-d765-48fd-bb00-b978c9bda7b5/datastream/OBJ/view