基于CAE技术的TB5钛合金V形波纹管结构优化设计Structural optimization of V-shaped TB5 titanium alloy metal bellow based on CAE technology

采用线弹性有限元方法对TB5钛合金V形波纹管在轴向均布载荷作用下变形过程与应力分布进行了模拟分析，总结了不同结构参数对波纹管结构刚度与应力分布的影响规律，并据此对TB5钛合金V形波纹管结构设计进行了优化。分析结果表明：波纹管结构刚度随波纹管V形夹角、内径增大而增大，随波数增多而降低；波纹管径向应力分布随壁厚、V形夹角增大而趋于均匀，而波高增大导致径向应力分布均匀性降低；结构优化波纹管(波数为10，内径为80 mm)结构刚度为1 127.22 N/mm，在1 MPa均布载荷作用下，波峰外表面应力值为220.37 MPa，波谷处内侧为278.54 MPa。

Deformation process and stress distribution of TB5 titanium alloy bellow under evenly-distributed axial load was discussed via linear elasticity finite element method. The influences of structural parameters (inner diameter, thickness, V-shaped angle, wave number, wave height) on the stiffness and the stress distribution of the V-shaped bellow were summarized. The results show that the increase of thickness and V-shaped angle can homogenize the stress distribution while wave height has the opposite impact. The stiffness of the metal bellow rises when V-shaped angle and thickness go up and decreases as wave number increases. A group of optimized parameters are obtained according to the results under the condition that the wave number is 10 and the inner diameter is 80 mm. The stiffness of the optimized structure is 1 127.22 N/mm. The stress at the outer surface of the peak is 220.37 MPa while 278.54 MPa at the inner surface of the trough when an evenly-distributed axial pressure (1 MPa) is loaded.

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