This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Vehicle Body Structure Durability Analysis
Annotation ability available
Sector:
Language:
English
Abstract
Due to several indeterminate factors, the assessment of the durability performance of a vehicle body is traditionally accomplished using test methods. An analytical fatigue life prediction method (four-step durability process) that relies mainly on numerical techniques is described in this paper. The four steps comprising this process include the identification of high stress regions, recognizing the critical load types, determining the critical road events and calculation of fatigue life. In addition to utilizing a general purpose finite element analysis software for the application of the Inertia Relief technique and a previously developed fatigue analysis program, two customized programs have been developed to streamline the process into an integrated, user-friendly tool. The process is demonstrated using a full body, finite element model.
Fatigue life can be analytically predicted using the above-mentioned methodology when detailed local design information and correct body loads are available. However, up-front engineering requires durability assessment before this information is readily available. This motivates a root-cause analysis of durability problems which leads to the development of a set of generic design guidelines. These guidelines can be used in developing body design in the up-front phase.
Recommended Content
| Technical Paper | Practical Approach for Fast Durability Analysis & Iterations |
| Technical Paper | Full Scale Road Simulated Endurance Test |
Authors
Citation
Kuo, E. and Kelkar, S., "Vehicle Body Structure Durability Analysis," SAE Technical Paper 951096, 1995, https://doi.org/10.4271/951096.Also In
References
- Liu T. S. Haug E. J. “Computational Methods for Life Prediction of Mechanical Components of Dynamic Systems,” Technical Report SR-86-24 Center for Computer Aided Design, University of Iowa Iowa City, Iowa 1986
- Bisplinghoff R. L. Ashley H. Halfman R. L. “Aeroelasticity,” Addison-Wesley Publishing Company, Inc. Reading, Massachusetts 1955
- MacNeal R. H. “The NASTRAN Theoretical Manual,” National Aeronautics and Space Administration
- Nelson M. F. Wolf, J. A. Jr. “The Use of Inertia Relief to Estimate Impact Loads,” SAE Paper No. 770604
- Johnson P. O. “Automobile Body Load,” SAE Transaction 64 1956
- Shkolnikov M. B. “Application of the Thin-Walled Beam Theory in the Analysis of Automobile Structures.” SAE Paper 840731
- Simic D. Jelic L. J. Aksi M. “Torsion Dynamic Load Analysis of Passenger Car Body,” SAE Paper 851683
- Webb G. G. “Torsional Stiffness of Passenger Cars,” SAE Publication C172/84
- Woo W. S. Haug E. J. “Dynamics of Flexible Mechanical Systems Using Vibration and Static Correction Modes,” Journal of Mechanisms, Transmissions, and Automation in Design 8 3 1986 315 322
- Singh B. “Laboratory Methods for Evaluating Car Body Structure - Dynamics and Durability Performance,” IMechE
- Kuo E. Y. Loh W. Murley R. G. “CAE Process for Global Durability Analysis in Support of Up-Front Design,” SAE Paper 950576