Original scientific paper

Research on the cyclic load life of automobile bellows

X. L. Wu ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China
C. Zheng ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China
M. Xu ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China
A. J. Zheng ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China *
L. L. Zhu ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China
P. X. Li ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China
J. H. Yao ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China
M. Wang ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China
J. H. Wang ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China
W. H. Xu ; Ningbo Cigarette Factory, China Tobacco Zhejiang Industry Co., Ltd., Ningbo 315040, China

* Corresponding author.

Abstract

In this study, a Finite Element Computational (FEC) model for automotive bellows exhaust pipes is established, and the impact of displacement loads on their fatigue life is investigated. The relationships between various structural parameters of the exhaust pipes and stress, strain, and cycle counts are elucidated. Furthermore, the bellows’ structure is optimized through an orthogonal experiment. A microscopic morphological analysis is conducted on 309S stainless steel automotive bellows exhaust pipes after fatigue failure. The findings indicate that as displacement loads increase, the fatigue life of the bellows exhaust pipes decreases. The error between finite element analysis and experimental results is found to be less than 8,8 %. During the water swell forming stage, partial martensite is produced due to cold deformation. Under alternating loads, with noticeable cracks at the wave peaks, indicating the presence of internal fatigue characteristics.

Keywords

309s steal automobile corrugated pipe; fatigue; microstructure

Hrčak ID:

315696

URI

https://hrcak.srce.hr/315696

Publication date:

1.7.2024.

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