低碳低合金钢的静力韧度与断裂韧度

Relationship Between Tension Toughness and Fracture Toughness of Low Carbon Low Alloy Steel

采取静拉伸和平面应变断裂韧性测试方法,测量了S355,S275,Q345D,Q345E4种低碳低合金钢自室温至-100℃的基本力学性能,包括屈服强度、抗拉强度、静力韧度、断裂韧度以及韧脆转变温度,试图寻找4种金属材料静力韧度和断裂韧度之间的关系;通过对200多组样品的试验结果进行分析,发现4种金属材料在其各自韧脆转变温度之上的静力韧度Uk和断裂韧度J0.2BL存在线性关系。

Basic mechanical properties for four kinds of low carbon and low alloy steels,including S355,S275,Q345D,Q345E,were examined by means of tension toughness and plane strain fracture toughness tests at room temperature to-100℃.Test results of yield strength,tensile strengh,tension toughness,fracture toughness and ductile-brittle transition temperature for each steel were obtained for the sake of identifying the relationship between tension toughness and fracture toughness.More than 200 groups of samples were tested and analysed.It shows that there is a linear relationship between tension toughness Ukand fracture toughness J0.2BL for each steel at a tempearture which is greater than its own ductile-brittle transition temperature respectively.And this sastisfied the requirement of the linear equation.