Static standard strain loading device based on simply-supported pure bending beam and method thereof

Abstract

The invention relates to a static standard strain loading device based on a simply-supported pure bending beam and a method thereof, wherein the device and the method are used for static strain calibration. The device mainly comprises a loading actuation module, a deformation measurement module, a heating module and a strain beam. The loading actuation module comprises a loading actuator (1) and 4 loading rods (2). Through independently driving each loading rod (2), strain beam loading is performed so as to generate a standard strain. The deformation measurement module comprises a test displacement meter (5) and a slide platform (7) and deformation measurement is completed. The method comprises a strain beam loading method, a strain beam deformation deflection test method, a loading strain calculating method and a feedback control method, wherein the strain beam loading method is used to load and unload a strain beam and change a force condition; the strain beam deformation deflection test method is used to test a deformation deflection of the strain beam; the loading strain calculating method is used to calculate a strain loaded on the strain beam according to the measured deformation deflection; and the feedback control method is used to make the strain beam be in a pure bending state and adjust a loading strain size to be the standard strain. In the invention, a standard strain source with high precision can be provided under a normal temperature.

Description

technical field [0001] The invention belongs to the field of measuring instruments, and relates to a static standard strain loading device and method based on simply supported purely curved beams. Background technique [0002] During the static calibration of the strain sensor, a standard strain source is required. Since there is no strain transfer benchmark established internationally or domestically, laboratories independently establish standard strain sources. The standard strain source consists of two parts, one is the device for generating strain, and the other is the measuring device and method for high-precision identification of the generated strain. At present, the strain-generating devices are generally in the form of simply supported pure bending beams, cantilever equal strength beams, or rigid double-arm pure bending beams. In occasions that do not require high precision, simple cantilever equal strength beams are often used. Simply supported pure bending beams...

AI Technical Summary

Problems solved by technology

However, the assumed parabola only appears in the ideal pure bending situation. In addition, the measurement of the chord length and chord height requires that the measured chord must be perpendicular to the symmetry axis of the parabola, otherwise it will cause a large error

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