前言最近几年来,火力发电厂延长寿命的紧迫问题是对用于高温、长时的结构材料的损伤预测和剩余寿命评定。高温服役的材料,不仅承受纯蠕变或纯疲劳损伤,而且还承受机械应力和热应力造成的更复杂的蠕变—疲劳交互作用损伤。由于蠕变或疲劳作用下断裂和变形具有不旧样式,所以在蠕变—疲劳交互作用下的剩余寿命及损伤的精确评定相当复杂。为了精确评定蠕变—疲劳损伤,设法使用一些有损和无损试验方法,然而至 INTRODUCTION In recent years, the pressing issue for thermal power plants to extend their lifetime has been the prediction of damage and residual life for structural materials used at high temperatures and for long periods of time. Materials subjected to high temperatures not only suffer purely pure or pure fatigue damage, but also suffer from the more complex creep-fatigue interaction damage caused by mechanical and thermal stresses. Since creep or fatigue has rupture and deformation not in the old style, the accurate assessment of the remaining life and damage under the creep-fatigue interaction is quite complex. In order to accurately assess creep-fatigue damage, try to use a number of lossy and non-destructive testing methods, however