Analysis of X - ray and neutron diffraction test methods for residual stress measurement

Završni rad bavi se numeričkom analizom zavarenih spojeva s posebnim naglaskom na analizu zaostalih naprezanja i deformacija koje nastaju kao posljedice procesa zavarivanja. Završni rad sastoji se od dva dijela, teorijskog i praktičnog. U teorijskom dijelu definirani su i pojašnjeni pojmovi zaostalih naprezanja i deformacija. U radu se posebno naglašava kakav utjecaj navedeni pojmovi imaju na radni komad. Nadalje, opisane su metode određivanja zaostalih naprezanja, a poseban naglasak je stavljen na neutronsku i rendgensku difrakcijsku metodu. Obrađuju se i norme HRN EN ISO 21432:2020 i HRN EN 15305:2008, a na samom kraju teorijskog dijela rada opisuju se i metode kojima je moguće smanjiti zaostala naprezanja i deformacije. Drugi dio završnog rada posvećen je eksperimentalnom dijelu u kojem se prema odabranom realnom komadu izrađuje model u programskom paketu Visual – Environment. Pravilnom izradom modela moguće je pokrenuti simulaciju pomoću koje se dobiva uvid u raspodjelu i iznos zaostalih naprezanjaThis undergraduate thesis deals with numerical analysis of welded joints with special emphasis on the analysis of residual stresses and strains. This undergraduate thesis consists of two parts, theorethical and practical. In the theoretical part, the concepts of residual stresses and strains are defined. The undergraduate thesis emphasizes the influence of these terms on the workpiece. Furthermore, methods for determining residual stresses are described, with special emphasis on the neutron and X – ray diffraction methods. The norms HRN EN ISO 21432:2020 and HRN EN 15305:2008 are also discussed, and at the end of the theoretical part, the methods by which it is possible to reduce residual stresses and strains are described. The second part of the undergraduate thesis is dedicated to the experimental part in which a model in the Visual – Environment software package is created according to the selected real piece. With the correct construction of the model, it is possible to run a simulation that provides insight into the distribution and level of residual stresse