This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Field Risk Assessment Based on Cylinder Head Design Process to Improve High Cycle Fatigue Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
Annotation ability available
In a separate SAE paper (Cylinder Head Design Process to Improve High Cycle Fatigue Performance), cylinder head high cycle fatigue (HCF) analysis approach and damage calculation method were developed and presented. In this paper, the HCF damage calculation method is used for risk assessment related to customer drive cycles.
Cylinder head HCF damage is generated by repeated stress alternation under different engine operation conditions. The cylinder head high cycle fatigue CAE process can be used as a transfer function to translate engine operating conditions to cylinder head damage/life. There are many inputs, noises, and design parameters that contribute to the cylinder head HCF damage CAE transfer function such as cylinder pressure, component temperature, valve seat press fit, and cylinder head manufacturing method. Material properties and the variation in material properties are also important considerations in the CAE transfer function. The high cycle fatigue damage for any usage cycle can be calculated from the component stress history (output of transfer function) and used to assess the total damage, or expended life, of the cylinder head.
Due to the wide possibilities for the variation in inputs, model parameters and material properties, the high cycle fatigue damage range is first evaluated for a known engine dynamometer test cycle. With a known performance on engine dynamometer under controlled conditions, the wide range of inputs due to customer usage can then be evaluated for high cycle fatigue damage and used to determine the risk of failure in the field for any given customer duty cycle.
CitationBrewer, T., Sever, C., Jin, R., Herr, M. et al., "Field Risk Assessment Based on Cylinder Head Design Process to Improve High Cycle Fatigue Performance," SAE Technical Paper 2017-01-1085, 2017, https://doi.org/10.4271/2017-01-1085.
- SAE Fatigue Design Handbook Warrendale Society of Automotive Engineers, Inc. 1997 978-1560919179
- Brewer , T. , Sever , C. , Jin , R. , Herr , M. Field Risk Assessment Based on Cylinder Head Design Process to Improve High Cycle Fatigue Performance SAE Technical Paper 2017-01-1085 2017
- Chen , X. , Engler-Pinto , C. , King , M. , Li , M. Aluminum Cylinder Head High Cycle Fatigue Durability Including the Effects of Manufacturing Processes SAE Technical Paper 2012-01-0540 2012 10.4271/2012-01-0540
- Socie , D. and Marquis , G. Multiaxial Fatigue Warrendale Society of Automotive Engineers, Inc. 1999 10.4271/R-234