eng Science and Education Publishing American Journal of Mechanical Engineering 2328-4110 2017-12-15 5 6 325 328 10.12691/ajme-5-6-19 AJME20175619 article František Trebuňa 1 Ján Kostka jan.kostka@tuke.sk 1 Miroslav Pástor 1 Patrik Šarga 1 Peter Frankovsky 1 Technical University of Košice, Faculty of Mechanical Engineering, Košice, Slovakia The aim of the paper is to propose a new methodology for verifying residual and operational stresses, determined by the drilling method. The newly proposed methodology will be based on the use of optical methods for total surface deformations and stress analysis through optically sensitive material applied to the surface of the object being investigated. http://pubs.sciepub.com/ajme/5/6/19/ajme-5-6-19.pdf residual stresses ring-core method photo stress