Abstract：In order to improve the measurement accuracy of dynamic torque, based on fractal theory, thermal contact conductance parameter was introduced to establish thermal contact conductance model of joint surfaces, and numerical simulation was carried out. Also, for a typical electric torque wrench calibration device, the model was used to simulate the temperature of its bearing joint and compared with experimental results. The results showed that: the thermal contact conductance is positively correlated with the contact load and material properties, but negatively correlated with the scale parameters, when 2.1≤D≤2.7, the thermal contact conductance increases with the increase of fractal dimension D, when 2.7≤D≤2.9, it decreases with the increase of fractal dimension D. Considering the thermal contact conductance, the maximum temperature of the bearing joints were 4～6℃ higher than that without consideration. And it was close to the experimental results, with relative errors of 2.7% and 3.3%, respectively.
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2024, Vol. 45 
