Resistance strain gauge bonding and calibration method capable of measuring contact pressure of disc friction pair

Abstract

The invention discloses a method for pasting and calibrating resistance strain gauges for measuring the contact pressure of disc friction pairs. Firstly, the characteristics of the external support structure of the friction pairs are analyzed to determine the size and layout of blind holes and the range of resistance strain gauges. According to the position of the blind hole, connect the patch and measure the initial resistance value of the resistance strain gauge at each measuring point, judge whether the pasted strain gauge is normal, then build a calibration test bench and carry out signal collection, and finally carry out the test through the data of each measuring point The fitting process obtains the calibration value of the measuring point resistance. The invention can realize the measurement of the strain of the paired sheet under the known loading pressure. Due to the welt angle and accidental factors, the strain gauge values ​​at each measuring point are different. If the direct pressure loading experiment will cause a large number of The calibration experiment provides a basis for correcting the dynamic and static pressure distribution measurement data of the friction plate. The calibration method of the present invention is simple, fast and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of stress and strain measurement on contact surfaces of friction pairs of brakes in the transmission field of crawler vehicles, and in particular relates to a bonding and calibration method of resistance strain gauges for measuring the contact pressure of disc friction pairs. Background technique [0002] High energy density friction transmission system is the key to high performance transmission. Its distinctive features are high power and high speed. The friction pair is widely used in the transmission field of tracked vehicles due to its excellent wear resistance and high heat capacity. Cu-based and Fe-based powder metallurgy friction pairs, including brakes and clutches, work in a multi-stress compound environment. As the three-parameter boundary-pressure, speed, and temperature are the main factors affecting the friction characteristics of the friction pair, and they are also the key factors in the desig...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to solve the measurement error caused by the loss of the resistance strain gauge and the radial sticking error under the condition of high speed and heavy load in the prior art, a method for measuring the contact of the disc friction pair is provided. Pressure resistance strain gauge pasting and calibration method, this method effectively solves the above problems, and lays the foundation for the subsequent on-site pressure measurement of the pair

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