Browse Publications Technical Papers 2009-01-0528
2009-04-20

Analyzing Field Failures of Engine Valve Springs in Presence of Non Metallic Inclusions by Applying Statistical and Fracture Mechanics Models 2009-01-0528

The reliability of engine valve springs is a very important issue from the point of view of warranty. This paper presents a combined experimental and statistical analysis for predicting the fatigue limit of high tensile engine valve spring material in the presence of non-metallic inclusions. Experimentally, Fatigue tests will be performed on valve springs of high strength material at different stress amplitudes. A model developed by Murakami and Endo, which is based on the fracture mechanics approach, Extreme value statistics (GUMBEL Distribution) and Weibull Distribution will be utilized for predicting the fatigue limit and the maximum inclusion size from field failures. The two approaches, experimental and theoretical, will assist in developing the S-N curve for high tensile valve spring material in the presence of non-metallic inclusions.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
We also recommend:
TECHNICAL PAPER

Fatigue Life Improvement through the “NOVA” Process

2013-01-1400

View Details

JOURNAL ARTICLE

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

2012-01-0498

View Details

TECHNICAL PAPER

On Duty Simulation of a Trimmed Body Under Dynamic Loads: Modal Superposition Approach to Evaluate Fatigue Life

1999-01-3150

View Details

X