Download

The goal of the work is to ensure the maximum accuracy of reconstruction of relief and de-formation displacement fields of structural element surface by the interferometric method. The authors successfully use novel algorithms for the processing of surface interferograms as well as the interferometers that follow the Twyman-Green scheme in order to implement such opti-cal testing of the surface. The maximum precision of obtained experimental data was achieved by the use of structural additions to the optical circuit and the selection of optical elements and their settings during adjustment of the interferometer, as well as new algorithms for the selec-tion and registration of a series of interferograms, speckle interferograms and speckle surface images. The authors proposed structural additions to the interferometer scheme used in the testing of both smooth and rough surfaces, appropriate methods for calculating the parameters of optical elements and their adjustments. Examples of obtained interferograms of the surface of metals under the static and fatigue cyclic loading, speckle interferograms of the surface of metals and polymer composites under the static and dynamic loading are given. The results of processing and interpreting these interferograms confirm that the Twyman-Green interfero-meter is an effective instrument for solving the problems of fracture mechanics and deformable solids. In particular, an assessment was made of: roughness and waviness of the surface of metals; sizes of the plastic zone around the stress concentrator; deformation displacement fields of metals and composites, as well as the detection of hidden defects in them.

1. Michelson, A.; Morley, E. On the Relative Motion of the Earth and the Luminiferous Ether. American Journal of Science. 1887, 34(203), 333-345. https://doi.org/10.2475/ajs.s3-34.203.333

2. Voronyak, T.I.; Kmet, A.B.; Muravsky, L.I.; Nazarchuk, Z.T.; Stasyshyn, I.V. Algorithm of surface relief retrieval at arbitrary phase shift between interferograms. Extraction and Processing. 2020, 48(124), 43-60. https://doi.org/10.15407/vidbir2020.48.043

3. Muravsky, L.I.; Ostash, O.P.; Kmet', A.B.; Voronyak, T.I.; Andreiko, I.M. Two-frame phase-shifting interferometry for retrieval of smooth surface and its displacement. Opt. Lasers Eng. 2011, 49, 305-312. https://doi.org/10.1016/j.optlaseng.2010.11.021

4. Muravsky, L.; Kmet', A.; Voronyak, T. Two approaches to the blind phase shift extraction for two-step electronic speckle pattern interferometry. Opt. Eng. 2013, 2(10), 101909. https://doi.org/10.1117/1.OE.52.10.101909

5. Malacara, D.; Servin, M.; Malacara, Z. Interferogram Analysis for Optical Testing. Boca Raton, FL: Taylor & Francis. 2005, 568. https://doi.org/10.1201/9781420027273

6. Sirohi, S.R. Optical Methods of Measurement: Wholefield Techniques, 2nd ed. Boca Raton, FL:Taylor & Francis, 2009, 290. https://doi.org/10.1201/9781420017762

7. Voronyak, T.I.; Muravs'kyi, L.I.; Stasyshyn, I.V. Interferometric device for determining deformation displacement fields of rough surfaces. Patent of Ukraine for a utility model #135595. Bull. # 13, 10.07.2019. (in Ukrainian)

8. Voronyak, T.I.; Muravs'kyi, L.I. Calculation of parameters of the optical curcuit for systems of remote measurement of spherical bodies dimensions. Physical methods and means of control of environments, materials and products. 2003, 8, 145-150. (in Ukrainian)

9. Kononov, V.I.; Fedorovsky, A.D.; Dubinsky, G.P. Optical systems for image construction. Tekhnika, 1981. (in Russian)

10. Jones, R.; Wykes, C. Holographic and Speckle Interferometry. Cambridge University Press., 1989, 140-141. https://doi.org/10.1017/CBO9780511622465

11. Voronyak, T.I.; Kmet', A.B.; Muravs'kyi, L.I. Determination of the 3D fields of displacements by the method of phase-shifting speckle interferometry. Materials Science. 2009, 45(3), 372-377. https://doi.org/10.1007/s11003-009-9201-8

12. Goodman, J.W. Speckle Phenomena in Optics Theory and Applications. SPIE Press: Bellingham, WA, USA, 2020. https://doi.org/10.1117/3.2548484

13. Sirohi, R.S. (Ed.) Speckle Metrology; Marcel Dekker: New York, NY, USA, 1993.

14. Lobanov, L. M.; Muravs'kyi, L. I.; Pivtorak, V. A.; Voronyak, T. I. Monitoring of the Stressed State of Structural Elements with the Use of Electromagnetic Waves of Optical Range, in: Z. T. Nazarchuk Ed., Technical Diagnostics of Materials and Structures: A Handbook [in Ukrainian], Vol. 3, Prostir-M, 2017, ISBN 978-617-7501-37-3.

15. International standard ISO 21920-2:2021. Geometrical product specifications (GPS). Surface texture: Profile - Part 2: Terms, definitions and surface texture parameters.

16. Nazarchuk, Z.; Muravsky, L.; Kuryliak, D. Optical Metrology and Optoacoustics in Nondestruc-tive Evaluation of Materials. Springer Series in Optical Sciences. Volume 242. Singapure: Springer Nature Singapure Pte Ltd., 2023. - 401 p. ISSN 0342-4111. ISSN 1556-1534 (electronic). Springer Series in Optical Sciences ISBN 978-981-99-1225-4. ISBN 978-981-99-1226-1 (eBook).

17. Nazarchuk, Z.T.; Muravsky, L.I.; Kuts, O.G. Nondestructive Testing of Thin Composite Structures for Subsurface Defects Detection Using Dynamic Laser Speckles. Research in Nondestructive Evaluation. 2022, 33(2), 78-97. https://doi.org/10.1080/09349847.2022.2049407

18. Surface roughness. Parameters and characteristics. GOST 2789-73, 1973 (in Russian).