关键词: 管道钢管, 设计准则, 失效判据, 技术条件, 机械性能, 屈强比, 性能指标组合

Abstract: In view of the main failure modes and failure criterion of pipelines,the mechanical property of pipeline's requirements adopting fracture mechanics as designing methods and also the importance of controlling of the ration of yield strength to tensile strength, the toughness requirements of the pipelines were disscussed in detail.It showed that the property requirement for pipeline could be different when adopting different designing criterion,and the technical specification of pipeline should be developed in purpose of the largest value of property combination of materials. When using YBB criterion, the best property combination is K_IC/δ_y; it takes when adopting LBB criterion. The pipeline's toughness requirement to prevent plastic collapse is also presented.

Key words: pipeline, design cr terion i, failure criterion, technical requirement, mechanical property, ratio of yield to tensible strength, property combination