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Fatigue Life Prediction of an Automotive Chassis System with Combined Hardening Material Model

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2016-01-0378-s.pdf (2.81 MB)

Date

2016-04-05

Authors

George, John K.
Gross, Daniel
Jahed, Hamid
Roostaei, Ali Asghar

Journal Title

Journal ISSN

Volume Title

Publisher

Society of Automotive Engineers

Abstract

The choice of an appropriate material model with parameters derived from testing and proper modeling of stress-strain response during cyclic loading are the critical steps for accurate fatigue-life prediction of complex automotive subsystems. Most materials used in an automotive substructure, like a chassis system, exhibit combined hardening behavior and it is essential to capture this behavior in the CAE model in order to accurately predict the fatigue life. This study illustrates, with examples, the strain-controlled testing of material coupons, and the calculations of material parameters from test data for the combined hardening material model used in the Abaqus solver. Stress-strain response curves and fatigue results from other simpler material models like the isotropic hardening model and the linear material model with Neuber correction are also discussed in light of the respective fatigue theories. A prediction of number of cycles for crack initiation of an automotive chassis system under a braking load cycle are compared to the results of physical tests in order to understand the merits and limitations of each model.

Description

Replicated with permission by SAE, Copyright © 2016 SAE International. Further distribution of this material is not permitted without prior permission from SAE. George, J., Gross, D., Jahed, H., and Roostaei, A., "Fatigue Life Prediction of an Automotive Chassis System with Combined Hardening Material Model," SAE Technical Paper 2016-01-0378, 2016, doi:10.4271/2016-01-0378.

Keywords

Chassis, Fatigue damage, Forecasting, Hardening, Stress analysis, Stress-strain curves, Appropriate materials, Automotive subsystems, Combined hardenings, Fatigue life prediction, Isotropic hardenings, Material parameter, Strain controlled testing, Stress-strain response, Fatigue of materials

LC Keywords

Citation

URI

https://doi.org/10.4271/2016-01-0378
 http://hdl.handle.net/10012/12068

Collections

Waterloo Research
Mechanical and Mechatronics Engineering