基于BS7910对含裂纹T型板的安全性评估研究  

STUDY ON SAFETY OF T PLATE CONTAINING CRACK BASED ON BS7910

作　　者：杨绍坤[1] 王欣[1] 贾兴军[2] 高顺德[1] 蔡福海 

机构地区：[1]大连理工大学机械工程学院,大连116023 [2]中海油能源发展股份有限公司油田建设工程分公司,天津300452 [3]常州益利亚重工机械科技有限公司,常州213000

出　　处：《机械强度》2016年第6期1306-1311,共6页Journal of Mechanical Strength

基　　金：国家科技支撑计划项目(2011BAF04B01);辽宁省高校创新团队计划(LT201400193);中海油能源发展股份有限公司科技项目(HFKJ-YJ1305)资助~~

摘　　要：失效评估图(FAD)常用来评估焊接结构出现裂纹后的安全性,BS7910中给出了三个等级的评估方法,随着评估等级增加,精度提高,需要的数据增多。该标准在压力容器和石油管道安全性评估中应用广泛。海上吊机工作等级高,年检中有时会发现疲劳裂纹,但是海上吊机维修成本高、周期长,严重影响生产效率,故对含裂纹结构进行安全性评估具有重要意义。利用邵永波实测的材料性能数据,结合Abaqus软件构建了海吊裂纹位置处T型板的3C级评估曲线并与常规的2A级评估曲线进行了对比,结果表明两者趋势一致且2A级评估偏于安全,说明该结构可按照BS7910进行安全性评估。按照常规的2A级评估给出了一定裂纹尺寸下T型板结构的临界载荷。Failure assessment diagram （FAD） is usually used to evaluate the safety of welded structures containing cracks. There are three assessment levels in BS7910. As the assessment level increases, accuracy is improved and more data is required. This standard is widely used in safety assessment of pressure vessels and pipelines. The working level of offshore crane is relatively high and fatigue cracks can be found on it during the routine inspection. However, due to its high cost and long cycle of maintenance, the productivity is seriously affected. Therefore it is vital to commence safety evaluation on the cracked structure. This paper utilized Shao Yongbo＇ s experimental data to establish the 3C curves of the cracked structure of offshore crane, and compared it with the 2A curves of the BS7910 standard. The result shows that the tendencies of both curves are the same and 2A curve is more conservative. Thus the structure can be evaluated according to BS7910. This paper offers the critical load of T-plate that contains certain dimension of crack according to level 2A evaluation.

关 键 词：BS7910 含裂纹T-型板 安全性评估 极限承载能力 临界载荷 

分 类 号：TH218[机械工程—机械制造及自动化]