Strain gauge installation process

Abstract

The invention relates to the technical field of strain measurement, and especially relates to an installation process for a strain gauge, which is used for mounting the strain gauge on a turbine blade. The strain gauge includes a paster and a lead, and one end of the lead is fixedly connected to the paster; and the turbine blade includes a margin plate and a blade body disposed on an outer side ofthe margin plate. The installation process includes the following steps: performing hole-opening treatment on the margin plate to form a through hole penetrating the margin plate, and allowing the through hole to extend in a direction from the inner side to the outer side of the margin plate; and fixing the paster on the blade body, and making the other end of the lead wire pass through the through hole from the outer side of the margin plate to reach the inner side of the margin plate; and enabling the lead to be fixedly connected to the margin plate. The installation process can better fixthe lead of the strain gauge, and can also make a stress measurement value of the turbine blade closer to an actual working condition.

Description

technical field [0001] The present disclosure relates to the technical field of strain measurement, in particular to a strain gauge installation process. Background technique [0002] In the development of aero-engines, the stress measurement of turbine blades mainly relies on high-temperature strain gauges. Among them, due to the high speed of the turbine blades and the blowing of the airflow, the installation of the high temperature strain gauge and the fixing of the lead wires are the key to the success of the test. [0003] In the prior art, the installation process of the high-temperature strain gauge is to process the wire groove on the edge plate of the turbine blade, and then fix the lead wire of the strain gauge in the wire groove through the flame spraying layer, and make the lead wire cross the edge of the edge plate to reach the edge of the turbine blade. near the tenon. This process has the following problems: [0004] 1. There are special requirements for th...

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Problems solved by technology

[0004] 1. There are special requirements for the width and depth of the wire slot. Although the deeper wire slot is good for the lead wire to pass through, it is easy to cause the loss of cold air flow, while the shallower and narrower wire slot will increase the difficulty of the lead wire. The wider wire slot The wire slot also affects the bonding of the flame sprayed coating, causing the lead wire to fall off easily, so the processing of the wire slot is difficult

[0005] 2. Processing wire grooves on the edge plate of the turbine blades will easily lead to uneven mass distribution of the turbine blades, which will aggravate the vibration of the turbine blades, which will lead to a large difference between the measured value of the stress and the actual working condition

[0006] 3. The edge plate of the turbine blade is the boundary between the cold air flow and the hot air flow. The thermal expansion of the edge plate is quite different, which makes the flame spray coating in the wire groove easy to fall off, and the cold air flow and hot air flow will also be on the edge plate. eddy currents converging on the outside of the

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