江苏大学学报（自然科学版）2011，Vol.32Issue(2)：175-178,231,5.DOI:10.3969/j.issn.1671-7775.2011.02.012
X100管线钢裂纹体的弹塑性断裂失效分析
Constraint effect and fracture behaviour for X100 pipeline steel
摘要
Abstract
Constraint effect and fracture behaviour for X100 pipeline steel with axial crack were quantitatively studied by elastic-plastic fracture theory combined with FEA. Considering the plastic effects, a parameter βQ was introduced on the basis of J - Q theory and the fracture criterion of J - βQ double parameters was established. The failure curve of X100 was fitted from the data of JR - △α experiment. Failure pressures for pipelines with internal and external axial cracks were predicted separately. The results show that constraint effect of the external crack is little stronger than the internal crack, but it is opposited when α/δ≤0. l8. For shallow cracks (α/δ≤0. 40), crack tip fields are not very constrained and yield failure is most likely to occur as plastic deformation is larger, the failure pressure of pipeline corrosion criterion (PCORRC) is conservative. For deep cracks, strengthened constraint effect results in small plastic deformation and fracture failure will take place.关键词
X100管线钢/裂纹/断裂/约束/有限元分析分类
通用工业技术引用本文复制引用
王钟羡,黄建业..X100管线钢裂纹体的弹塑性断裂失效分析[J].江苏大学学报（自然科学版）,2011,32(2):175-178,231,5.基金项目
国家"863"计划项目(2008AA100905) （2008AA100905）
