S型焊接金属波纹管弯曲刚度分析

Analysis of Bending Rigidity of S-shaped Welded Metal Bellows

弯曲刚度是焊接金属波纹管的重要性能指标。采用有限元仿真方法和实验室测试方法,进行了S型单层和双层焊接金属波纹管弯曲刚度研究。研究结果表明,有限元仿真结果比实验室测试结果更符合实际工况,几何非线性条件下的有限元仿真结果比几何线性条件下的更符合实际工况。几何非线性条件下的有限元仿真数据表明,波纹管弯曲刚度随着施加到波纹管上的轴向力的增大而减小,波纹管弯曲角度随着力的增大呈现出线性增大的现象,双层结构波纹管的弯曲刚度是单层结构弯曲刚度的1.7~1.9倍。

Bending stiffness is an important performance index of welded metal bellows.Using finite element simulation method and laboratory test method,the bending stiffness of S-shaped single-layer and double-layer welded metal bellows was studied.The research results show that the finite element simulation results are more consistent with the actual working conditions than the laboratory test results,the finite element simulation results under the geometric nonlinear condition are more consistent with the actual working conditions than that under the geometric linear condition.The finite element simulation data under geometrically nonlinear conditions show that the bending stiffness of the bellows decreases with the increase of the axial force applied to the bellows,and the bending angle of the bellows increases linearly with the increase of the force.The bending stiffness of the double-layer structure bellows is 1.7 to 1.9 times that of the single-layer structure.