The Prediction of Connecting Rod Fretting and Fretting Initiated Fatigue Fracture

2004-01-3015

10/25/2004

Event
2004 Powertrain & Fluid Systems Conference & Exhibition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/2004-01-3015
Pages
8
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.
Additional Details
Publisher
Published
Oct 25, 2004
Product Code
2004-01-3015
Content Type
Technical Paper
Language
English