圆柱壳机匣热应力试验研究

一、试验设备与温度场的形成 试验设备与测量系统(图1):包括加温系统、温度测量系统和热应力测量系统。试件是1Cr18Ni9Ti材料制成的圆柱壳机匣,固定在底座上。加温器由周向均布的300V碘钨灯组成。热电偶是温度测量的传感器。在热应力测量中,采用中温应变片作为传感器,把电讯号经电阻平衡箱传到YJ-5应变仪,录取应变数据。 形成所需要的温度场是开展热应力试验研究的前提。根据试件加温的要求,由可控硅整

AN EXPERIMENTAL STUDY ON THERMAL STRESS IN CYLINDRICAL CASE

This paper describes temperature and thermal stress distributions as well as measuring technique and method to generate these two parameters. The temperaturedistributions are produced by iodine-wolfram lamps and measured by thermocouples.The temperature fields which are steady and symmetrical have both axial and radial temperature gradients. The experimental curve has been fitted with the aid of the least square method in form of algebraical polynomials. Under such temperature distributions,the measurements of thermal stresses in cylindrical case with fixed ends were carried out by mid-temperature strain gauge,and the profiles of thermal stresses versus the case axial distance were obtained.In addition,thermal stresses were calculated numerically employing the finite element method, SAP-5 program. The calculated results are compared with the test data satifactorily.