Voronyak T. Development of the methodology for diagnosing deformed state of constructional materials by using optical-digital interferometry

Object of research - spatial-temporal processes of constructional materials deformation. Aim - development of methodology for diagnostic of deflected mode by recovery and analysis of their deformation reliefs, spatial displacement and subsurface strain fields by methods and devices of optical-digital interferometry. Methods of optical systems and measurement theory, phase-shifting laser interferometry, computer simulation, statistical analysis were used. New method of two-step phase-shifting interferometry with arbitrary phase shift, which allows us to recover deformation displacement fields and surface reliefs, was developed and realized. New method for determination of geometrical parameters of plastic and fatigue predestruction zones was developed and realized. New method for revealing subsurface defects and delaminations in constructional materials by applying initial loading and by analysis of out-of-plane surface displacement fields was developed. Results of the theses were implemented in State-owned Company "Antonov" for diagnostic of airplane construction elements produced from layered composite materials and in SRC "Carat" for the control of geometry of surfaces and inner strains of specimens made from transparent materials, as well as in lectures and laboratory works for students of the National University Lviv polytechnic.