一、前言随着原子能,石油化工、热力装置等工业领域的飞速发展,测试反应堆、锅炉、燃汽轮机、喷气发动机用的材料,在高温循环下的疲劳强度已日益引起重视,这就是热疲劳试验技术。由于剧烈的温度变化,产生了极大的热应力,因此,试验必须保证温度循环与应变(或应力)循环同步变化。过去的热疲劳试验,由于对温度的变化 I. INTRODUCTION With the rapid development of industries such as atomic energy, petrochemicals and thermal devices, the fatigue strength of test reactors, boilers, gas turbines and jet engines has drawn increasing attention at high temperature cycles. This is the result of the thermal fatigue test technology. Due to the intense temperature change, great thermal stress is generated. Therefore, the test must ensure that the temperature cycle changes synchronously with the strain (or stress) cycle. Past thermal fatigue tests due to changes in temperature