摘要
目的研究拉伸冲击载荷作用下螺栓预紧力对应力波的影响。方法针对螺栓弹性变形、塑性变形和冲击破坏3种情形,对螺栓未施加预紧力及施加不同预紧力下的连接结构进行冲击数值模拟,对比分析连接结构的测点应变及螺栓响应,并与霍普金森拉伸实验结果进行对比。结果螺栓达到断裂或塑性变形时,预紧力对测点应变及螺栓最大应力影响较小;螺栓弹性变形时,预紧力对测点应变及螺栓最大应力影响较大。结论螺栓达到断裂或塑性变形时,螺栓拉伸变形远大于预紧力变形,此时预紧力影响可忽略;螺栓在弹性变形时,螺栓拉伸变形与预紧力变形程度接近,此时预紧力影响不可忽略,且预紧力越高,螺栓变形越大。
This paper aims to study the effect of preload in bolt on stress wave under tensile impact load.We have considered three cases involving bolt elastic deformation,plastic deformation and impact failure.Impact numerical simulation is carried out with bolt no-preload or under different preloads.Strain of measuring point and bolt response of connection structure are compared,and the results are also compared with those of Hopkinson tensile test.When bolts reach fracture or plastic deformation,the preload has little effect on the strain of the measuring point and the maximum stress of the bolt;when bolt is elastically deformed,the preload has some effect on the strain of the measuring point and the maximum stress of the bolt.When bolts reach fracture or plastic deformation,the tensile deformation of bolts is much larger than that of the preload deformation,and the influence of the pretension force can be neglected;when bolt is elastically deformed,since the tension deformation of bolts is close to that of the preload deformation,the influence of the preload can’t be neglected and the bolt deformation increases with the increase of preloads.
作者
杨璞
谢若泽
陈刚
陈成军
YANG Pu;XIE Ruo-ze;CHEN Gang;CHEN Cheng-jun(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621900,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Mianyang 621900,China)
出处
《装备环境工程》
CAS
2021年第5期113-120,共8页
Equipment Environmental Engineering
