螺栓连接结构冲击断裂行为数值模拟  

Numerical simulation of impact fracture behavior of bolt-connected structures

作　　者：雒卫廷 LUO Weiting(Department of Physics,Luliang University,Laliang 033000,China)

机构地区：[1]吕梁学院物理系,山西吕梁033000

出　　处：《兵器材料科学与工程》2020年第6期82-85,共4页Ordnance Material Science and Engineering

基　　金：山西省“1331工程”煤矿机械装备故障诊断与健康管理技术重点创新团队(TD201812)。

摘　　要：为研究螺栓连接结构冲击作用下的力学性能,利用有限元软件构建模型,数值模拟其断裂行为。用Q235和Q345两种钢制备4种试样,用摆锤与热模拟示波冲击法,分析试样的冲击断裂行为。结果表明:试样1比试样2初始断裂时间短、裂纹扩展速度快、完全断裂失效行为早,且侧向膨胀值低,塑性变形较低;试样1与试样3、4相比,试样4的螺栓直径大、冲击能量较高,侧膨胀值较低;热模拟示波冲击中连接结构热影响区的韧性、最高载荷、冲击后的位移均与热输入量成反比。In order to study the mechanical properties of bolted structures under impact,finite element software was used to build a model and simulate the fracture behavior of bolted structures numerically.Four kinds of samples were prepared by using Q235 and Q345 steel materials.The impact fracture behavior of the samples was analyzed by using pendulum and thermal simulation oscilometry.The results show that the initial fracture time of sample No.1 is shorter than that of sample No.2,the crack propagation speed is faster,the complete fracture failure behavior is earlier,the side expansion value and the plastic deformation are lower.Compared with samples No.3 and No.4,the bolt diameter and impact energy of sample No.4 are higher,while the side expansion value is lower.The toughness of the heat-affected zone of the connected structure in the thermal analog oscillogram impact,the maximum load and the displacement after the impact are inversely proportional to the heat input.

关 键 词：螺栓 连接结构 摆锤冲击 示波冲击 断裂行为 

分 类 号：TU391[建筑科学—结构工程]