The correction of temperature gradient in high temperature dynamic experiment

The measuring signal should be corrected since the temperature gradient field is introduced in the waveguide bar in the high temperature dynamic experiment. The high temperature dynamic experiment is a thermal-mechanical coupling process, so the numerical simulation should include the thermal and mechanical parameters. The temperature gradient distribution in the bar is obtained by using ABAQUS to analyze the heat transfer of the waveguide bar at high temperature, and the reliability of the analysis results is proved by comparing with the theoretical value. The results of heat transfer is imported into the dynamic simulation process to get the waveform change rule in any position of the waveguide bar. The numerical results show that the true strain of the waveguide bar in the high temperature zone is significantly larger than the values measured by the strain gages, and the higher the temperature is, the more obvious the temperature difference is, which further shows the necessity of correcting the measured waveform in high temperature dynamic experiment. The error between the measured signal and real signal is only associated with the heating temperature and independent of the loading rate of the experimental system.