Calibration Method for Sensitivity Coefficient of High-temperature Strain Gauges at High Strain Rate

doi:10.12382/bgxb.2021.0189

Abstract

Abstract: A new method is used to calibrate the sensitivity coefficient of the high-temperature strain gauge at high strain rate.The high-temperature strain gauge under calibration is pasted on the surface of a standard specimen by using the split Hopkinson bar with synchronous assembly device，and they are placed in the same temperature and stress environment. The specimen is subjected to impact loading at constant temperature. The sensitivity coefficient of the high-temperature strain gauge is obtained by collecting，calculating and comparing the output signals of the standard strain gauge on the split Hopkinson bar and the high-temperature strain gauge on the specimen. The calibration method applies to calibrate the sensitivity coefficient of guage at the strain rate of 10³ s^-1 in the temperature range from 293 to 1 473 K. The error of the calibrated sensitivity coefficient caused by the dispersion and attenuation of stress wave have a linear relation with the integral of the amplitude of the incident wave，and the experimental relative error is only 2.39%. The error caused by the inhomogeneous plastic deformation of sample is less than 1.5%，and the uncertainty of calibrated results is 1.517%.The experimental results show that the proposed method can be used to calibrate the sensitivity coefficient of the high-temperature strain gauge at high temperature and high strain rate.

Key words: high-temperaturestraingauge, sensitivitycoefficient, splitHopkinsonbar, highstrainrate

CLC Number:

TP212.1

WANG Fan, GUO Weiguo, WU Qian, GAO Meng. Calibration Method for Sensitivity Coefficient of High-temperature Strain Gauges at High Strain Rate[J]. Acta Armamentarii, 2022, 43(4): 899-909.

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