低温下结构钢材裂纹尖端张开位移的变化规律  

VARIATION OF CRACK TIP OPENING DISPLACEMENT OF STRUCTURAL STEEL AT LOW TEMPERATURE

作　　者：武延民[1] 王元清[1] 江见鲸[1] 石永久[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《低温建筑技术》2004年第1期1-3,共3页Low Temperature Architecture Technology

基　　金：国家自然科学基金项目 (No .5 0 0 780 2 9)

摘　　要：裂纹尖端张开位移 (CTOD)是材料断裂分析的重要判据指标。在GB T 2 35 8- 94金属材料裂纹尖端张开位移试验方法中 ,根据加载曲线的不同形式可以获得 5种不同的特征CTOD值。随着温度的降低 ,结构钢材的韧性降低 ,试验曲线的形状变化 ,可测得的特征CTOD值也不相同。本文在三种结构钢材低温下裂纹尖端张开位移试验的基础上 。Crack tip opening displacement(CTOD)is important criterion in fracture analysis.In national standard GB/T 2359-94 Test Method for Crack-tip Opening Displacement Measurement of Metallic Materials,five typical CTOD Values could be calculated according to shape of loading curve.As temperature drops,structural steel becomes less tough.Variation of shape of loading curve causes difference of typical CTOD values acquired at different temperature.The authors discussed variation of four typical CTOD value with temperature on basis of crack tip opening displacement test of three types of structural steels.

关 键 词：裂纹尖端张开位移 低温 CTOD 

分 类 号：TU391[建筑科学—结构工程]