eng Science and Education Publishing American Journal of Mechanical Engineering 2014-10-30 2 7 239 243 10.12691/ajme-2-7-13 AJME20142713 article Peter Frankovsky peter.frankovsky@tuke.sk 1 František Trebuňa 2 Ján Kostka 2 František Šimčák 2 Oskar Ostertag 2 Władysław Papacz 3 Department of Mechatronics, Faculty of Mechanical Engineering, Technical University of Košice, Košice, Slovakia Department of Applied Mechanics and Mechatronics, Faculty of Mechanical Engineering, Technical University of Košice, Košice, Slovakia Instytut Budowy i Eksploatacji Maszyn, Uniwersytet Zielonogórski, Zielona Góra, Poland The presented paper describes characteristic entities in PhotoStress method - isoclinic fringes, singular points, isostatic lines, and isochromatic fringes. These entities are used in PhotoStress method to visualise and quantify deformation and stress fields of various photoelastically coated structural elements. http://pubs.sciepub.com/ajme/2/7/13/ajme-2-7-13.pdf isoclinic fringes singular points isostatic lines isochromatic fringes