Study of the Fatigue Failure of Engine Valve Springs Due to Non-Metallic Inclusions

Event
SAE 2012 World Congress & Exhibition
Authors Abstract
Content
The engine valve spring is a very important component in automotive engine systems. The non-metallic inclusions in an engine valve spring will significantly reduce its reliability. In this study, an attempt was made to establish a correlation between fatigue failures and non-metallic inclusions by applying statistical methods. Fatigue tests with BZ and OTEVA-90 materials are performed with two different types of experiments, which are rotating bending fatigue test (Nakamura test) and spring fatigue test. By using RELIASOFT, the data of these two tests are analyzed with the Weibull distribution in order to statistically estimate BZ and OTEVA-90's fatigue lives at 90% low confidence under different stresses. On the other hand, fatigue strength of these materials can be estimated by Murakami and Endo's model with maximum inclusion size predicted from the Gumbel distribution.
Meta TagsDetails
DOI
https://doi.org/10.4271/2012-01-0498
Pages
7
Citation
Choucair, H., Zhou, J., Jawad, B., and Liu, L., "Study of the Fatigue Failure of Engine Valve Springs Due to Non-Metallic Inclusions," SAE Int. J. Mater. Manf. 5(2):388-394, 2012, https://doi.org/10.4271/2012-01-0498.
Additional Details
Publisher
Published
Apr 16, 2012
Product Code
2012-01-0498
Content Type
Journal Article
Language
English