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Using Fatigue Life Prediction to Increase Reliability of Automotive Structures
Technical Paper
2003-01-0471
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In today’s automotive industry, mechanical engineers are encouraged to develop lightweight vehicles to reduce the consumption of energy. At the same time, the service life and safety standards, which become m ore and more rigorous, must be fulfilled.
Numerical analysis of the component’s lifetime in an early stage of the development process can increase the reliability of automotive structures, and lead to shorter development periods and cost reductions due to a decrease in testing expenditures.
Most cracks in fatigue testing originate in notches, welds or spot-weld joints. The dimension of the notches, the design and the position of the weld seams, as well as the number and the location of the spot weld joints have a significant technical and economical impact. In order to achieve an optimum use of the material, an optimization of these critical areas has to be performed.
This can be done by postprocessing the stresses of a Finite Element Analysis (FEA) in FEMFAT, a software package which automatically takes the stress gradient in notches and the special properties of weld seams and spot weld joints as defined in the FE-model into account. Furthermore the user can consider different influences for the fatigue analysis, like surface roughness, temperature and mean stress.
This paper includes the theoretical background and procedure of the computational optimization and will show applications on automotive structures.
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Authors
Citation
Peiskammer, D., Dannbauer, H., Dutzler, E., and Puchner, K., "Using Fatigue Life Prediction to Increase Reliability of Automotive Structures," SAE Technical Paper 2003-01-0471, 2003, https://doi.org/10.4271/2003-01-0471.Also In
Reliability & Robust Design in Automotive Engineering on CD-ROM
Number: SP-1736CD; Published: 2003-03-03
Number: SP-1736CD; Published: 2003-03-03
References
- FKM-Richtlinie Festigkeitsnachweis Forschungsheft 183-2, Vorhaben Nr. 154 Frankfurt 1994
- FEMFAT Seminar Notes Steyr 1995
- Haibach, E. Betriebsfestigkeit Verfahren und Daten zur Bauteilberechnung VDI-Verlag, Germany, Duesseldorf 1989
- German FKM Guideline Riule 1998 Rechnerischer Festigkeitsnachweis fuer Maschinenbauteile VDMA Verlag Frankfurt/Main 3rd edition
- Eichelseder, W. Rechnerische Lebensdaueranalyse von Nutzfahrzeugkomponenten mit der FEMethode Dissertation TU Graz 1989
- Hück, M. Thrainer, L. Schütz, W. Berechnung von Wöhlerlinien für Bauteile aus Stahl, Stahlguss und Grauguß - Syntetische Wöhlerlinien Bericht Nr. ABF 11 der Arbeitsgemeinschaft Betriebsfestigkeit; dritte überarbeitete Fassung 1983
- Zenner, H. Heidenreich R. Richter, Fatigue Strength under Nonsynchronous Multiaxial Stresses Z. Werkstofftech 16 101 102 Germany 1985
- Nokleby J. O. 1981 Fatigue under Multiaxial Stress Conditions, Rep. MD-81001, Div. Mach.Elem. The Norway Inst.Technol. Trondheim
- Sanetra C. Zenner H. 1991 Betriebsfestigkeit bei mehrachsiger Beanspruchung unter Biegung und Torsion 23 29 Konstruktion 43 Springer Verlag Germany
- Chu C. C. Conle F. A. Huebner A. 1996 An integrated Uniaxial and Multiaxial Fatigue Life Prediction Method 337 348 337 348 VDI Berichte Nr. 1283
- Gruen Florian Form- und Topologieoptimierung unter Berücksichtigung der Betriebsfestigkeit Montanuniversität Leoben, Institut für allgemeinen Maschinenbau (Prof. Eichlseder) and ECS 2002
- FEMFAT User Manual Steyr 1995