低间隙Ti–6Al–4V抗剪螺栓预紧过程及连接结构力学性能的有限元仿真

Finite Element Simulation of Preload Process and Mechanical Properties of Connection Structure of Low Interstitial Ti–6Al–4V Shear Bolt

螺栓连接广泛应用于机械工业,针对低间隙Ti–6Al–4V ELI六角头螺栓的预紧过程以及预紧力对连接结构中服役性能的影响规律,基于ABAQUS有限元仿真软件,建立了考虑螺纹细节的单搭接螺栓连接结构的三维有限元仿真模型。建立Ti–Ti、Ti–Al螺栓连接模型,模拟了螺栓连接结构预紧和拉伸两个分析过程。通过拉伸试验和有限元仿真对比,验证了Ti–6Al–4V ELI材料参数。通过有限元仿真得到了螺栓预紧力加载曲线、螺栓连接结构承载力变化曲线以及在预紧和拉伸过程中螺栓连接结构的应力分布状态,研究了螺栓预紧力对螺栓连接结构力学性能的影响。

Bolt connections are widely used in the mechanical industry. For the performance of low clearance Ti–6Al–4V ELI hexagonal head bolts in service in the connection structure, a 3D finite element model of single-lap bolted connection structure considering thread details was established based on ABAQUS finite element simulation software.The Ti–Ti and Ti–Al bolting models were established to simulate the two analysis processes of preload and tension of the bolt connection structure. The Ti–6Al–4V ELI material parameters were verified by comparison of tensile tests and finite element simulation result. The loading curve of the bolt preload force, the load capacity curve of the bolt connection structure and the stress distribution state of the bolt connection structure during preload and tension were obtained by finite element simulation, and the influence of the bolt preload force on the mechanical properties of the bolt connection structure was investigated.