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The Prediction of Connecting Rod Fretting and Fretting Initiated Fatigue Fracture
Technical Paper
2004-01-3015
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The influence of big-end bore fretting on connecting rod fatigue fracture is investigated. A finite element model, including rod-bearing contact interaction, is developed to simulate a fatigue test rig where the connecting rod is subjected to an alternating uniaxial load. Comparison of the model results with a rod fracture from the fatigue rig shows good correlation between the fracture location and the peak ‘Ruiz’ criterion, rather than the peak tensile stress location, indicating the potential of fretting to initiate a fatigue fracture and the usefulness of the ‘Ruiz’ criterion as a measure of location and severity.
The model is extended to simulate a full engine cycle using pressure loads from a bearing EHL analysis. A fretting map and a ‘Ruiz’ criterion map are developed for the full engine cycle, giving an indication of a safe ‘Ruiz’ level from an existing engine which has been in service for more than 5 years.
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Citation
Merritt, D. and Zhu, G., "The Prediction of Connecting Rod Fretting and Fretting Initiated Fatigue Fracture," SAE Technical Paper 2004-01-3015, 2004, https://doi.org/10.4271/2004-01-3015.Also In
Diesel Particulate Systems, Engines and Components, and Performance Additives 2004
Number: SP-1898 ; Published: 2004-10-25
Number: SP-1898 ; Published: 2004-10-25
References
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- RuizC. and CheinK.C., in conference proceedings ‘Fatigue of engineering materials and structures’, 187-194, 1986, London, Institute of Mechanical Engineers.
- Wang D., 1999, “Development and Validation of Finite Difference SABRE-EHL Code,” GVRR Technical report, No. 1046.
- ZhangR., MahadevanS., “Aging Aircraft Fretting Fatigue Reliability Analysis”. 8th ASCE Specialty Conference on Probabilistic Mechanics and Structural Reliability. PMC2000-171.
- SzolwinskiM.P., FarrisT.N., “Mechanics of fretting fatigue crack formation”. Wear 198 (1996) 93-107.