基于LS-DYNA的主蒸汽管道甩动仿真分析

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Simulation and Analysis of Main Steam Pipe Whip Based on LS-DYNA

摘要: 为真实模拟主蒸汽管道破裂后与拉伸型大间隙约束件(U-bolt)的碰撞过程,准确获得甩击力的整体分布和时程变化规律,基于有限元法进行管道甩动分析,利用通用非线性动力分析有限元程序LS-DYNA建立了主蒸汽管道和U-bolt的有限元模型,对管道破裂后与U-bolt的碰撞过程进行了仿真计算,分析了U-bolt的应力应变分布规律和时程变化曲线,探讨了管道破裂后速度和加速度的变化规律,对于防甩计算中重点关注的U-bolt变形量和甩击力进行了详细计算。结果表明,有限元法得出的甩击力约为动力学分析法计算结果的36%。
- LS-DYNA /
- 主蒸汽管道 /
- 大间隙约束件 /
- 仿真分析
Abstract: In order to accurately simulate the collision process and obtain the overall distribution,the finite element model of main steam pipe and the U-bolt is established by LS-DYNA software,the collision process is simulated,and the U-bolt stress-strain distribution and time history curves is analyzed.The variation of the velocity and acceleration of the pipe is discussed and the detailed calculations of the U-bolt deformation and rejection are conducted.The result shows that the rejection of the finite element method is only about 36% of the rejection by kinetic analysis.
- LS-DYNA /
- Main steam pipe /
- U-bolt /
- Simulation and analysis