Study of mechanical characteristics of window security films by phase-stepping photoelasticity

E. Stoykova; W. Van Paepegem; S. De Pauw; J. Degrieck; V. Sainov

doi:10.1117/12.822465

19 December 2008 Study of mechanical characteristics of window security films by phase-stepping photoelasticity

E. Stoykova, W. Van Paepegem, S. De Pauw, J. Degrieck, V. Sainov

Proceedings Volume 7027, 15th International School on Quantum Electronics: Laser Physics and Applications; 70270P (2008) https://doi.org/10.1117/12.822465
Event: 15th International School on Quantum Electronics: Laser Physics and Applications, 2008, Bourgas, Bulgaria

Abstract

The goal of this study is to apply photoelasticity for analysis of the mechanical behavior of thermoplastic polyester window security films. More specifically, the change of the photoelastic pattern for film samples with mechanical stress concentrators (holes and cracks) under tensile load is observed. For the purpose, the samples are covered with photoelastic birefringent PhotoStress® coatings. Being subjected to a tensile external load, the film transfers the strains over its surface to the coating. The latter are observed as interference fringes - isochromatic fringes, which exhibit the difference of the principal strains and isoclinic fringes, which characterize principal strains orientation. The photoelastic measurements were performed with a circular reflection polariscope with a white light and monochromatic illumination (575 nm). In the second case, two-loads phase-shifting technique is used for digital retrieval of isochromatics and isoclinics by successive acquisition of two pairs of four fringe patterns obtained at four different configurations of the optical elements of the polariscope. Since the specifics of the studied thermoplastic materials requires simultaneous recording of the phase-shifted patterns in the non-linear part of their loading curve, we propose an optical arrangement for real-time recording as a future development for solution of non-linear dynamic tasks.

Citation Download Citation

E. Stoykova, W. Van Paepegem, S. De Pauw, J. Degrieck, and V. Sainov "Study of mechanical characteristics of window security films by phase-stepping photoelasticity", Proc. SPIE 7027, 15th International School on Quantum Electronics: Laser Physics and Applications, 70270P (19 December 2008); https://doi.org/10.1117/12.822465

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KEYWORDS

Photoelasticity

Phase shifts

Solar concentrators

Glasses

Fringe analysis

Reflection

Safety

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