Method for calibrating strain multiplier

Abstract

The invention discloses a method for calibrating a strain multiplier. The method comprises the following steps of: a, mounting the strain multiplier on a test piece; b, loading force to the test piece, so that the test piece strains; c, acquiring a strain value epsilon b of the strain multiplier and a strain value epsilon s of the test piece; and d, determining an amplification factor of the strain multiplier according to the strain value epsilon b of the strain multiplier and the strain value epsilon s of the test piece; wherein in the step a, a first strain piece is arranged on the test piece; and in the step c, the strain value epsilon s of the test piece is acquired by measuring a strain value of the first strain piece. Due to the technical scheme, because the strain value epsilon s of the test piece is obtained by directly measuring the strain value of the first strain piece which is arranged on the test piece, deviation is hardly present, and the obtained amplification factor of the strain multiplier is accurate; therefore, a using effect of the strain multiplier is improved.

Description

technical field [0001] The present invention relates to a calibration method, in particular to a calibration method of a strain multiplier. Background technique [0002] The strain multiplier is to make the mechanical strain of a certain part of the multiplier greater than the strain of the tested piece through deformation transmission under the condition of not affecting the strain of the tested piece. Strain multipliers are often used as companion elements to fatigue life gauges for fatigue monitoring. The fatigue life meter is a fatigue damage sensing element, which records the alternating strain history of the pasted place through the automatic accumulation of resistance changes, and is suitable for long-term fatigue damage monitoring of structures. At present, the fatigue life meter is mainly used for fatigue damage monitoring of aerospace structures, such as aerospace materials 30CrMnSi and so on. Since the strain threshold of the fatigue life meter is 1000με, when t...

AI Technical Summary

Problems solved by technology

Moreover, in step c of the existing calibration method, the strain value ε of the specimen s Usually, the theoretical value obtained by theoretically calculating the magnitude of the force loaded in step b and the size of the specimen will deviate from the actual strain value of the specimen, thus making the magnification of the strain multiplier obtained through calibration inaccurate. And then affect the use effect of the strain multiplier

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