P92钢主蒸汽管道在温度与振动作用下的形变响应试验研究OA

To investigate the deformation characteristics of P92 steel main steam pipelines with welds under the coupled effects of temperature and low-frequency vibration,plate specimens were prepared from retired main steam pipeline sections of a thermal power plant.Using a high-temperature tensile testing machine and strain monitoring system,strain response tests were conducted under different tensile loads and 5-10 Hz low-frequency vibration excitation at elevated temperatures of 300℃,500℃,and 600℃.The results indicate that surface deformation intensifies with increasing temperature.At 500℃,the strain range is[1198,3360]με,while at 600℃,the strain increase is significantly greater than that at 500℃.Under constant temperature and load,strain fluctuations are approximately 20 με.External low-frequency impact vibration causes an instantaneous strain drop,with fluctuation amplitudes at high strain levels(around 50 με)exceeding those at low strain levels(around 20 με).After vibration ceases,the strain recovers to its original trend.These findings provide an experimental basis for the safe operation and deformation monitoring of main steam pipelines in thermal power plants.