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Prediction of Failure Stress of Rocker Arm Shaft using FEM and Striation  

Lee, Soo-Jin (동아대학교 대학원 기계공학과)
Lee, Dong-Woo (동아대학교 기계공학부)
Hong, Soon-Hyeok (부경대학교 공동실험실습관)
Cho, Seok-Swoo (강원대학교 자동차공학과)
Joo, Won-Sik (동아대학교 기계공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.24, no.3, 2007 , pp. 84-90 More about this Journal
Abstract
As a result of vehicle maintenance of rocker arm shaft for 4-cylinder SOHC engine, failure stress analysis of rocker arm shaft is needed. Because more than 30% of vehicles investigated have been fractured. Failure stress analysis is classified into an naked eyes, microscope, striation and X-ray fractography etc. Failure stress analysis by using striation is already established technology as means for seeking cause of fracture. But, although it is well known that striation spacing corresponds to the crack growth rate da/dN, it is not possible to determine ${\sigma}_{max}\;and\;{\sigma}_{min}$ under service loading only from striation spacing. This is because the value of striation spacing is influenced not only by ${\Delta}K$ but also by the stress ratio R. In the present paper, we determine the stress ratio using orthogonal array and ANOVA, and propose a prediction method of failure stress which is combined with FEM and striation.
Keywords
Rocker arm shaft; Failure stress; ANOVA;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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