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一、概述由于设计规范的变更降低了安全系数,提高了容器的设计工作应力,这样在开孔、接管等局部地区的峰值应力就更高,并可能超过材料的屈服限。另一方面,随着容器大型化的趋势,采用各种高强度钢更为广泛,这些钢种在制造过程中容易产生各种缺陷,于是更增加了疲劳破坏的可能性。据有关资料介绍,压力容器运行中的破坏有75％以上是由疲劳引起的。为此,各国先后建立了疲劳试验装置,广泛开展疲劳试验研究工作,并在有关规范中对疲劳
First, an overview As the design code changes to reduce the safety factor, improve the design of the container work stress, so that openings, take over and other local peak stress is higher, and may exceed the yield limit of the material. On the other hand, with the trend of large-scale containers, various types of high-strength steels are used. These steels are prone to various defects in the manufacturing process, thereby increasing the possibility of fatigue failure. According to the information, over 75% of the damage in the operation of pressure vessel is caused by fatigue. To this end, countries have established a fatigue test device, extensive fatigue test research work, and in the norms of fatigue