Crack Width Variation Test Device and Its Combination Structure of Strain Gauge

Abstract

A strain gauge combined structure provided by the present invention is used to measure the width variation of a crack on a component, and comprises a first strain gauge and a second strain gauge of which the lengths are same, the first and second strain gauges abut together parallelly and both comprise two attachment segments and a crack-spanning segment for connecting the two attachment segments.The two attachment segments of the first strain gauge and the two attachment segments of the second strain gauge are both used to attach to the to-be-measured component, the crack-spanning segments are used to span the crack, and the crack-spanning segment of the first strain gauge is protruded relative to the corresponding attachment segments to form a protruding part, so that the crack-spanningsegment of the first strain gauge does not generate the strain along with the crack width variation. The above strain gauge combined structure enables the accuracy to the test results to be improved.The present invention also provides a crack width variation test device adopting the strain gauge combined structure.

Description

technical field [0001] The invention relates to the technical field of engineering structure crack measurement, in particular to a crack width variation testing device and a strain gauge combination structure thereof. Background technique [0002] Some components, such as metal components, concrete components, etc., will appear tiny cracks with a width of 0.02-2.00mm when the stress is uneven. It is particularly important to monitor the change of crack width and analyze the reasons. In the prior art, displacement gauge or dial gauge is usually used to test the variation of crack width, and its shortcoming is as follows: 1, the precision of displacement gauge test is 0.05mm, and the precision of dial gauge test is 0.001mm, and its test precision is average 2. The purchase cost of displacement gauges or dial gauges on the market ranges from a few hundred yuan to several thousand yuan, and the cost is relatively high; in addition, after using the dial gauge or displacement gaug...

AI Technical Summary

Problems solved by technology

However, existing equipment, such as a multimeter, can only obtain the change in the overall resistance of the strain gauge. Therefore, the change in crack width obtained by this method should actually be the change in the overall size of the component when it is stressed, which is not only Including the change value of the crack width, it also includes the dimensional change value of the components on both sides of the crack due to the stress, because it cannot exclude the dimensional change of the component due to the stress when measuring the crack width change value, which leads to the measured crack The result of the width variation is too large, and the measurement is inaccurate

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