轮毂螺栓断裂有限元分析  

FE analysis of fracture for hub bolt

作　　者：金城旭 闫萌萌[2] 任靖日[2] 赵海龙 

机构地区：[1]鲜一汽车配件有限公司技术研究所 [2]延边大学工学院机械工程系,延吉133002 [3]忠北大学工学院机械工程系,清州28644

出　　处：《塑性工程学报》2016年第5期192-196,共5页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51265050)

摘　　要：应用有限元法预测了轮毂螺栓断裂的原因。通过拉伸实验获得了JIS SCM435热处理后的力学性能,应用理论计算得到某轮毂螺栓的摩擦系数,基于Normalized C&L韧性断裂准则计算得到该螺栓的断裂系数。应用DEFORM-3D仿真软件对该螺栓的断裂过程进行了有限元模拟分析。结果表明,该轮毂螺栓的断裂是由于外力施加扭矩过大所导致。当螺母开始拧紧时,在剪力作用下,与螺母咬合的第一圈螺纹牙根处应力最大,当拧紧达到一定程度后,第一圈的螺纹牙受到严重破坏,观察螺栓内部应力变化时,螺母下方未咬合螺纹段的中心处的应力开始增大,并向外扩散,表明此时拉力起主导作用。在最后的断裂阶段,拉力逐渐减小,剪力开始起主导作用,从产生裂痕的牙根表面处,由外向内以45°形式产生断裂,与实物断裂形貌基本一致。研究结果可作为推测断裂原因的参考。The fracture failure reason of a hub bolt was predicted by finite element method（FEM）.Firstly,the mechanical properties of the heat-treated material of JIS SCM 435 were obtained from tensile tests,the friction coefficient of the bolt was calculated by using conventional theory,and the CDV（crack damage value）was calculated by using the ductile fracture model of normalized CL.Then,the fracture failure of the hub bolt was analyzed by using the software DEFORM 3D.The simulation results show that the fracture failure is mainly caused by the over torque added on the hub bolt.When the bolt is tightened and under the action of shear force,the tooth root stress of the first lap of engagement between the bolt and the nut is the largest.When the bolt is tightened to a certain extent,the first thread is damaged severely,the internal stress at the center of the following thread section begins to increase and spreads out,indicating that the tension plays a leading role at this time.In the final stage of fracture,the tension is reduced,and shear force begins to play a leading role again.On the crack tooth root surface,the fracture occurs in the form of 45-degree angle from outside to inside,which is consistent with the physical fracture appearance.The results could be a reference to explain the fracture.

关 键 词：轮毂螺栓断裂 有限元分析 摩擦系数 断裂系数 

分 类 号：TB24[一般工业技术—工程设计测绘]