Calibrating method of strain multiplier

Abstract

The invention discloses a calibrating method of a strain multiplier, which comprises the following steps of: a: mounting the strain multiplier on a test piece; b: applying a force to the test piece so that the test piece generates a strain; c: obtaining a strain value ([epsilon]b) of the strain multiplier and a strain value ([epsilon]s) of the test piece; and d: determining a multiplying 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 second strain disc is mounted on the strain multiplier; and in the step c, a strain value ([epsilon]b) of the strain multiplier is obtained through measuring a strain value of the second strain disc. According to the technical scheme, the method can accurately obtain the strain value ([epsilon]b) of the strain multiplier, and the obtained multiplying factor of the strain multiplier is accurate, thus the use 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 strain multiplier is measured by installing a fatigue life gauge on the strain multiplier b , but the result obtained by this indirect measurement method is not accurate enough, which makes the magnification of the strain multiplier obtained by calibration inaccurate, and then affects the use effect of the strain multiplier

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