中等厚度开孔板和缺口板断裂试验  

FRACTURE EXPERIMENTS OF PLATES WITH HOLES AND NOTCHED PLATES

作　　者：王万祯[1,2] 刘五峰[1] 许继祥[1] 张丹丽[3] 史艳莉[1] 

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]宁波大学建筑工程与环境学院,浙江宁波315211 [3]华北水利水电学院水利职业学院土木系,郑州450008

出　　处：《钢结构》2010年第2期32-34,38,共4页Steel Construction

基　　金：国家自然科学基金资助项目(50808098)

摘　　要：对中等厚度的10个中心开椭圆孔板件和10个单侧半椭圆缺口板件进行断裂试验,研究开孔和缺口尖锐度对中等厚度钢板断裂模式的影响。试验较精确地记录了全程载荷-位移曲线。试验结果显示:试件的第一条宏观裂纹起始于缺口顶端厚度中面,裂纹在厚度方向贯通后沿垂直加载方向迅速扩展,直至完全断裂。开孔或缺口愈尖锐的试件,其开裂延性愈差。开孔板试件宏观断裂荷载比缺口板试件明显要高。断口粗糙且有大量韧窝,断口暗灰色呈杯锥状,断裂形式为正断与剪断混合型。本次试验为研究中等厚度钢板断裂机理及抗断设防提供了较可靠的试验数据。Fracture tests were performed on 10 plates with elliptical hole and 10 notched plates . The effect of notch sharp on fracture ductility of structural steel was studied. Load-displace curves of specimens were recorded accurately. Experimental results indicated that the first macro crack initiated in the thickness of notch edge, the crack spread vertical the direction of loading until complete fracture. The fracture ductility is lower for the specimens with the sharper notch, and macro-fracture load of the plates with hole were higher than the notched plates. Fracture mode was combination of shear and normal fracture. The fracture section is rough and in cuppy style. These experimental results provide objective evidence to investigate rupture mechanism and fracture design of structural steel.

关 键 词：结构钢 缺口板 开孔板 开裂 

分 类 号：TG115.57[金属学及工艺—物理冶金] TS653.5[金属学及工艺—金属学]