Measurement of local tensile properties of welded joint using digital image correlation method

Abstract

M. Milosevic(a), N. Mitrovic(b), R. Jovicic(a), A. Sedmak(b), T. Maneski(b), A. Petrovic(b), and T. Aburuga(b) ((a)Innovation Center of Faculty of Mechanical Engineering, b Faculty of Mechanical Engineering, University of Belgrade): Measurement of Local Tensile Properties of Welded Joint Using Digital Image Correlation Method Welded joints are heterogeneous structures consisted of several zones with different mechanical properties. During the loading, these zones are showing non-uniform mechanical behavior. In the heat affected zones is particularly complicated to monitor mechanical properties due to small dimensions, therefore HAZ mechanical properties were most often estimated through hardness testing, microstructure etc. The aim of the experiment is to assess the possibility of using Digital Image Correlation method in determining local tensile properties of HAZ. Testing was performed using 3D optical measuring system. Plates made of S235 were butt welded using MAG welding process for specimen preparation. Tensile testing of specimen characterized heterogeneous strain field and variable strain values in the monitored HAZ, indicating that DIC method is promising tool for precise local strain analysis of small dimension fields.