Q500qE桥梁钢止裂性能试验研究

Experimental Investigation on Crack Arrest Property of Q500qE Bridge Steel

1. Luoyang Ship Material Research Institute, Luoyang 471023, China;
2. Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipment, Luoyang 471023, China

摘要: 针对桥梁用Q500qE高强度结构钢,分别开展了梯度温度型双重拉伸试验、落锤试验和标准圆截面试样拉伸试验,测得了钢板的止裂温度CAT、无塑性转变温度T_NDT、屈服强度R_el,在此基础上提出了CAT与T_NDT、R_el及板厚t的相关性方程。由相关性方程得到的止裂温度计算结果与实测结果的偏差在±5℃以内,表明该方程能够较好地表征止裂温度与无塑性转变温度、屈服强度、板厚之间的相关性。
- Q500qE /
- 桥梁钢 /
- 止裂性能
Abstract: Temperature-gradient double tension test, drop weight test and tensile test with standard circular cross-section specimens are conducted on Q500qE high-strength bridge steels. Crack arrest temperature CAT, nil-ductility transition temperature T_NDT, and yield strength R_el are obtained. A correlation formula is proposed to describe relationship between CAT, T_NDT, R_el and plate thickness t. The Deviation between the crack arrest temperature calculated by the proposed formula and that tested by double tension test is within ±5℃, indicating the validity of the proposed formula on describing correlation between crack arrest temperature, nil-ductility transition temperature, yield strength and plate thickness.
- Q500qE /
- bridge steel /
- crack arrest property

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