基于非对称循环加载位移的波纹管疲劳寿命

Fatigue life of bellows based on asymmetric cyclic loading displacement

以不锈钢U型波纹管为研究对象,基于ANSYS的Workbench平台构建了U型波纹管的疲劳寿命有限元分析模型,采用应力疲劳S-N曲线处理分析方法对疲劳寿命进行了评估,结合波纹管疲劳寿命试验验证了模型的可靠性。在外压和位移共同作用下对不同加载位移、不同加载方式下U型波纹管的疲劳失效进行了研究,结果表明,在不同加载位移下,疲劳寿命的变化较为显著,随着加载位移的增加,疲劳寿命不断降低;不同位移加载方式对波纹管的疲劳寿命同样也具有一定的影响,随着拉伸位移与压缩位移间差值的增大,波纹管的疲劳寿命降低。

Taking the stainless steel U-shaped bellows as the research object, the fatigue life finite element analysis model of U-shaped bellows was constructed based on the Workbench platform of ANSYS, the fatigue life was evaluated using the stress-fatigue S-N curves processing analysis method, and the reliability of the model was verified by the fatigue life test of bellows. The fatigue failure of U-shaped bellows with different loading displacements and different loading methods was investigated under the combined effect of external pressure and displacement. The results show that the fatigue life changes significantly with different loading displacements, and life decreases constantly as the loading displacement increases. Different displacement loading methods also have certain influence on the fatigue life of bellows, and the fatigue life of bellows decreases as the difference between tensile displacement and compression displacement increases.