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Automotive Body Fatigue Analysis – Inertia Relief or Transient Dynamics?
Technical Paper
1999-01-3149
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In this paper, the application of inertia relief and transient dynamics methods in vehicle structural stress analysis is considered. Then the principles and formulation of inertia relief approach are described briefly. Using MSC/NASTRAN finite element code, the two methods are used for a free-free beam model and the stresses in some selected elements are compared. The same procedure is repeated for a simplified vehicle body in white (B.I.W) model. The results of the analyses show that for obtaining satisfactory correct stresses using inertia relief approach, the frequency of the applied force should be much less than the fist natural frequency of the structure. It is also seen that the accuracy of the results for different elements may vary depending on the mode shape of the structure.
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Authors
Topic
Citation
Anvari, M. and Beigi, B., "Automotive Body Fatigue Analysis – Inertia Relief or Transient Dynamics?," SAE Technical Paper 1999-01-3149, 1999, https://doi.org/10.4271/1999-01-3149.Also In
References
- Blakely, K. MSC/NASTRAN Basic Dynamic Analysis, User's Guide The Macneal-Schwendler Corporation 1993
- Caffrey, J.P. Lee, J.M. MSC/NASTRAN Linear Static analysis, User's Guide The Macneal-Schwendler Corporation 1994
- Kuo, E.Y. Kelkar, S.G. “Vehicle Body Structure Durability Analysis” SAE Paper No. 951096 1995
- Yim, H.J. et. al. “An Integrated System for Dynamic Stress and Fatigue Life Prediction of Vehicle components” SAE Paper No. 951097 1995
- Nelson, M.F. Wolf, J.A. Jr, “The Use of Inertia Relief to Estimate Impact Loads” SAE Paper No. 770604 1977
- Bisplinghoff, R.L. Ashley, H. Halfman, R.L. Aeroelasticity Addison-Wesley Publishing Company, Inc. 1955