内压对小直径薄壁U型波纹管成形规律的影响

Effect of internal pressure on forming law of thin-wall U-shaped bellows with small diameter

为了研究内压对小直径薄壁U型波纹管的壁厚减薄率的影响行为,采用数值模拟分析的方法,基于ANSYS/LS-DYNA有限元分析软件,建立了小直径薄壁U型316L奥氏体不锈钢波纹管的内压成形过程的有限元模型,获得了小直径薄壁U型波纹管内压成形过程中的等效应力、等效应变和壁厚减薄率的分布演变规律。在相同的轴向进给位移条件下,获得了不同的内压对小直径薄壁U型波纹管的壁厚减薄率分布的影响规律,获得了成形质量合格的小直径薄壁U型波纹管的成形内压范围,研究结果为小直径薄壁U型波纹管的内压成形工艺的设计提供了数据参考。

In order to study the effect behavior of internal pressure on the wall thickness thinning rate of thin-wall U-shaped bellows with small diameter,using the numerical simulation analysis method,the finite element model of internal pressure forming process for the thinwall U-shaped 316 L austenitic stainless steel bellows with small diameter was established based on ANSYS/LS-DYNA finite element analysis software. The distributions and evolution laws of equivalent stress,equivalent strain and wall thickness thinning rate during the internal pressure forming process of thin-wall U-shaped bellows with small diameter were obtained. The effect law of different pressures on the wall distribution of thickness thinning rate for thin-wall U-shaped bellows with small diameter under the same axial feeding displacement conditions was obtained. The forming internal pressure range of qualified forming thin-wall U-shaped bellows with small diameter was obtained. The research results provide the data reference to the design of internal pressure forming process for thin-wall U-shaped bellows with small diameter.