This article discusses the traceability problem of relative mechanical deformations and presents the relevance of the development of a mechanical deformation measurement technique to obtain measurement results without comparison with a standard unit of the same kind. A state primary reference method for measuring the surface deformation of an elastically deformed beam of a rectangular constant cross section loaded according to the pure bending scheme and the equipment for implementing the method was developed. The article presents the procedure for establishing methodological parameters (e.g., changes in the ambient air temperature during measurement, initial non-flatness of the beam, and non-parallelism of beam faces) in the development course of the state primary reference measurement technique. The estimation procedure for the uncertainties of deformation measurements is described, and the identified sources of uncertainties and their contribution to the total uncertainty of the measurement results are indicated. The metrological characteristics of the measurement technique are calculated. The proposed technique is expected to aid in determining the characteristics of the reference and working measurement techniques for the surface strain of an elastically deformed beam of a constant rectangular cross section loaded according to the pure bending scheme.
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Yu. R. Shimolin is deceased
Translated from Izmeritel’naya Tekhnika, No. 2, pp. 34–43, February, 2022.
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Tribushevskaya, L.A., Shimolin, Y.R. Primary Reference Technique of the Surface Deformation Measurements of an Elastically Deformed Beam. Meas Tech 65, 118–128 (2022). https://doi.org/10.1007/s11018-022-02057-w
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DOI: https://doi.org/10.1007/s11018-022-02057-w