Determination of optical properties of materials used in holographic photoelasticity to solve the “rail – wheel” contact problem

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Bryukhovetskaya E. V., Konishcheva O. V., Brungardt M. V., Shchepin A. N. Opredeleniye opticheskikh svoystv materialov, ispol'zuyemykh v golograficheskoy fotouprugosti dlya resheniya kontaktnoy zadachi «rel's – koleso» [Determination of optical properties of materials used in holographic photoelasticity to solve the “rail – wheel” contact problem]. Sovremennye tekhnologii. Sistemnyi analiz. Modelirovanie [Modern Technologies. System Analysis. Modeling], 2020, Vol. 66, No. 2, pp. 10–15. 10.26731/1813-9108.2020.2(66).10-15

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This article considers the possibility of using a three-exposure method of holographic photoelasticity to determine optical constants of materials used to create three-dimensional models of rails in solving the “rail – wheel” contact problem.  In order to determine the optical constants С1 and С2, it is necessary to select a type of loading at which one of the stresses is equal to zero along the axis of symmetry of the sample. The Flamant problem meets these requirements. The three-exposure method of holographic photoelasticity makes it possible to obtain different sets of interference strips in a universal interferometer, which greatly simplifies the experiment. For testing, volumetric composite models are used, the main part of which is made of organic glass, and a thin plate of optically sensitive materials is glued into the central part. One model has an epoxy gluing-in, the other is made of polycarbonate.The materials of the volumetric composite models are subject to certain requirements, such as the equality of the elastic constants of the plexiglass of the main unit of the model, the optical material of the gluing-in and the hardened adhesive, and the difference of optical constants С1 and С2, so that calibration tests need to be carried out. For these purposes, the problem of “the effect of a rigid stamp on the elastic half-plane” was solved. Calibration check tests were carried out by a universal interferometer. Comparison of experimental results with theoretical solution showed rather high accuracy of determination of optic constants by means of three-exposure method of holographic photoelasticity.

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