论文部分内容阅读
一前言尽管在本世纪初就开展了对焊接结构疲劳性能的研究,然而世界上一些工业发达的国家将焊接疲劳设计纳入压力容器设计规范只是近二十年内的事。各个国家的疲劳设计规范至今仍各不相同,并且都需要通过进一步系统的实验分析研究,以逐步得到改善。我国目前压力容器疲劳设计规范尚处于空白状态。Harrison等人的研究指出:压力容器疲劳设计规范以焊接试样得到的数据为依据较为合理。既然焊接压力容器疲劳设计曲线的建立是以焊接试样疲劳试验为基础的,而疲劳试验的焊接试样又不存在统一的标准,焊接接头形式、受力状态,缺陷等对焊接试样的疲劳性能
A foreword Despite the study of the fatigue behavior of welded structures carried out at the beginning of this century, it was only in the last two decades that some of the most industrialized countries in the world have incorporated welding fatigue design into pressure vessel design codes. The fatigue design codes in various countries are still different from each other, and all need to be further improved systematically through experimental analysis. At present, China’s pressure vessel fatigue design specifications are still in a blank state. The study by Harrison et al. Shows that the pressure vessel fatigue design code is more reasonable based on the data obtained from the welding of specimens. Since the fatigue design curve of the welding pressure vessel is based on the fatigue test of the welding specimen, there is no uniform standard for the welding test of the fatigue test, and the fatigue of the welding specimen due to the form of the welding joint, the stress state, the defect, etc. performance