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| Q345中厚缺口板的断裂试验 | |
| 引用本文： | 王万祯,纪海涛,苏仁权,赵少俊,梁亚雄.Q345中厚缺口板的断裂试验[J].特种结构,2010,27(1):16-18. |
| 作者姓名： | 王万祯 纪海涛 苏仁权 赵少俊 梁亚雄 |
| 作者单位： | 1. 兰州理工大学,土木工程学院,730050 2. 陕西铁路工程职业技术学院建筑工程系,渭南,714000 3. 兰州理工大学,理学院,730050 |
| 基金项目： | 国家自然科学基金项目，宁波大学科研基金 |
| 摘 要： | 对18个厚度为26mm的单边V型缺口钢板进行了断裂试验,研究了刻弧半径r对低合金钢Q345中厚板断裂模式的影响。试验显示:裂纹起始于三轴强约束的缺口边缘厚度中面,裂纹沿厚度贯通后迅速沿薄弱截面宽度扩展,宏观断裂面大致垂直于加载方向,断口粗糙且有大量韧窝。缺口根部刻弧愈尖锐的试件,断裂延性愈差。缺口根部刻弧平缓的试件,净截面平均开裂强度略高。 |
| 关 键 词： | 结构钢 断裂机理 缺口板 裂纹 |
Fracture Experiments of Q345 Steel Notched Plates |
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| Affiliation: | ( 1. School of Civil Engineering, Lanzhou University of Technology, 730050, China; 2. School of Civil Engineering, Shanxi Railway Institute, Weinan 714000, China; 3. School of Science, Lanzhou University of Technology, 730050, China) |
| Abstract: | Fracture tests were performed on 18 V-type notched plates made of Q345 steel with the thickness of 26 mm. The effect of notch radius r on fracture ductility of steel was studied. The experimental results reveal that the crack initiates at the edge of the notch where the stress triaxiality is high. The first crack forms a through-thickness flaw and rapidly expands across the remaining width of the plate. The final fracture section is perpendicular to the direction of loading. The fracture section is coarse going with lots of dimples. The fracture ductility is low for the specimens with the sharp notch. The fracture strength is slight high for the specimens with the large notch radius. |
| Keywords: | Structural steel Rupture mechanism Notched plates Crack |
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