124. Detection of the surface defects in thin polymeric films using projection moiré

V. Miliūnas1, A. Voloshin2, E. Kibirkštis3, A. Stepanenko4, N. Buškuvienė5, L. Ragulskis6

1, 3, 5Kaunas University of Technology, Department of Manufacturing Engineering,
Studentų 56, 51424, Kaunas, Lithuania

2Lehigh University, Department of Mechanical Engineering and Mechanics, Bethlehem, PA 18015, USA

4Belarusian National Technical University, Department of Organization of Packaging Production, Nezavisimosty Ave., 65, 220013, Minsk, Republic of Belarus

6Vytautas Magnus University, 44404, Kaunas, Lithuania

3Corresponding author

E-mail: 1valdas.miliunas@ktu.lt, 2av01@lehigh.edu, 3edmundas.kibirkstis@ktu.lt, 4annastepanenko@mail.ru, 5nijole.buskuviene@ktu.lt, 6l.ragulskis@if.vdu.lt

Received 2 June 2017; received in revised form 19 June 2017; accepted 30 June 2017

DOI https://doi.org/10.21595/jme.2017.18817

 

Abstract. Experimental investigations of the polymeric films HDPE and PP and of the multi‑layered material PET+LDPE with defects (puckered surfaces, holes and segregation of the upper layer) were performed. For this purpose, the method of projection moiré was used. In the process of investigations, the images of the defects were determined. During the experimental investigations it was determined that the images and shapes of the eigenmodes, as well as the frequencies and amplitudes of vibrations change due to mechanical or structural defects in the polymeric films and because of symmetrical or un-symmetrical loading. Typical optical images for various types of defects were determined. In the paper smoothness of fringes by using the method of time averaged geometric moiré is also investigated. On the basis of a one dimensional model graphical relationships for linear variation with respect to longitudinal coordinate of amplitude of vibrations are obtained. They provide the background for the choice of the required number of images in a period of oscillations for different smoothnesses of moiré fringes.

Keywords: projection moiré, polymeric film, eigenmodes, surface defects, types of defects, typical images, vibrations, time averaged moiré, geometric moiré, smoothness of fringes.

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Cite this article

Miliūnas V., Voloshin A., Kibirkštis E., Stepanenko A., Buškuvienė N., Ragulskis L. Detection of the surface defects in thin polymeric films using projection moiré. Journal of Measurements in Engineering, Vol. 5, Issue 2, 2017, p. 106‑114.

 

Journal of Measurements in Engineering. June 2017, Volume 5, Issue 2

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