基于断裂韧性的钢厚板防脆断性能研究(Ⅰ)——分级评定方法  

STUDY ON BRITTLE FRACTURE OF THICK STEEL PLATE BASED ON FRACTURE TOUGHNESS INDEX——CLASSIFICATION METHOD

作　　者：王元清[1] 胡宗文[1] 石永久[1] 周晖[1] 陈宏[2] 

机构地区：[1]土木工程安全与耐久教育部重点实验室清华大学土木工程系,北京100084 [2]清华大学建筑设计研究院,北京100084

出　　处：《低温建筑技术》2011年第1期1-4,共4页Low Temperature Architecture Technology

基　　金：国家自然科学基金资助项目(50778102)

摘　　要：低温和厚度增大是钢材断裂韧性变差的重要因素,随着我国钢结构厚板的广泛应用和低温寒冷地区建筑业的快速发展,钢结构脆性破坏问题会越来越突出。现行规范中指导钢材选材的冲击功指标无法对断裂破坏做出准确的评定,因此引入基于断裂力学缺陷评估方法的断裂韧性指标非常必要。本文在钢结构厚板低温断裂韧性试验结果的基础上提出了一种钢结构厚板断裂韧性的分级评定方法,为选材方法的讨论奠定了基础。Low temperature and large plate thickness are important factors for toughness deterioration of structural steels. With a large number of applications of structural steel thick plate and the rapid development of construction industry in cold regions, brittle fractures of steel structures become more and more prominent. The impact toughness index adopted by the current design codes can＇ t make accurate evaluations about fracture failures, so the introduction of fracture toughness index used in fracture mechanics becomes very necessary. A fracture toughness classification method of thick steel plate is put forward in this paper following the results of fracture toughness tests at low temperature. This paper provides basis for material selection discussions in the succeeding paper.

关 键 词：钢厚板 低温 断裂韧性 裂纹尖端张开位移 

分 类 号：TU391[建筑科学—结构工程]