摘要
基于有限元分析结果,采用国家标准GB/T19624《在用含缺陷压力容器安全评定》,对含表面凹坑缺陷的压力钢管进行了安全评定。根据凹坑缺陷不同的分布状况,分别采用了不同的方法进行评定。当相邻两凹坑缺陷边缘间的最小距离在20mm范围内时,应采用常规评定的方法。结果表明,其对应的评定点落在评定曲线定义的安全范围内。这表明所评定的缺陷是可以接受的。当相邻两凹坑缺陷边缘间的最小距离大于20mm时,可采用凹坑评定的方法。两种方法评定结果均表明,压力钢管壁上的表面凹坑缺陷是可以接受的。
Based on the calculated results of finite element analysis and given the pit size,the criterion of safety assessment for in-service pressure vessels containing defects suggested by China was applied to assess the surface pit in penstock.The assessment wes carried out according to the CTOD(crack tip opeaning displacement)test result.Different assessment methods were used according to the pit distribution. The assessment results indicated that the assessment points are located within the safe region defined on the failure assessment diagrams.So the surface pit can be accepted.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第8期62-64,共3页
Transactions of The China Welding Institution
基金
西南大学青年基金资助项目(SWUQ2006002)
