This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Fatigue Simulation of Power Train Components During the Design Process
Technical Paper
2000-05-0204
Annotation ability available
Sector:
Event:
Language:
English
Abstract
The lifetime of power train components can be improved dramatically by finding crack initiation points with suitable software tools and optimization of the critical areas. With increasing capacities of computers the prediction of the lifetime for components by numerical methods gets more and more important. This paper discusses some applications of the outstanding fatigue simulation program FEMFAT supporting the assessment of uniaxially and multiaxially loaded components (as well as welding seams and spot joints).
The theory applied in FEMFAT differs in some aspects from classical approaches like the nominal stress concept or the local one and can be characterized by the term “influence parameter method”. The specimen S/N-curve is locally modified by different influence parameters as stress-gradient to take into account notch effects, mean-stress influence which is quantified by means of a Haigh-diagram, surface roughness and treatments, temperature, technological size, etc. It is possible to consider plastic deformations resulting in mean-stress rearrangements.
The dynamic loading of power train components are very often multiaxial, e.g. the stress state at each time is not proportional to one single stress state. Hence, the directions of the principal axes vary with time. We will present the way how such complex load situations can be handled with FEMFAT by the examples of a crank case and a gear box.
Recommended Content
Authors
Topic
Citation
Steiner, W., Steinwender, G., and Unger, B., "Fatigue Simulation of Power Train Components During the Design Process," SAE Technical Paper 2000-05-0204, 2000.Also In
References
- Chu C. C. „Critical Plane Fatigue Analysis of Various Constant Amplitude Tests for SAE1045 Steels“ SAE Technical Paper No. 940246 1-8 1994
- FKM-Richtlinie ”Festigkeitsnachweis” Forschungs-heft 183-2 Frankfurt. 1994
- Haibach, E. „Betriebsfestigkeit - Verfahren und Daten zur Bauteilberechnung“ VDI-Verlag Düsseldorf 1989
- Kriegel T. Schnattinger H. ”Verkurzung der Entwicklungszeiten am Beispiel eines Magnesiumgetriebegehauses“ DVM Bericht 123 1997
- Steiner, W. Fischer, P. ”Fatigue Analysis of the power divider gear VG3500” Proceedings of the 4 th Congress on gearing and Power Transmission Paris 1999
- Steinwender, G. Schlicht, O. Suchandt, T. ”Struk-turoptimierung eines neuen Getriebegehduses aus Magnesium mit der FE-Methode” 4. VDI Konferenz „Getriebe in Fahrzeugen 98” Friedrichshafen 1998
- Unger, B. Eichlseder, W. Raab, G. ”Numerical Simulation of Fatigue Life - Is it more than a prelude to tests?” Fatigue' 1996 Berlin 1996
- Zenner H. Heidenreich R. Richter I. „Fatigue Strength under Nonsynchronous Multiaxial Stresses“ Z. Werkstofftech 16 101 112 1985
- http://www.audi.com/java/models/index.html
- http://www.bmw.de/ Die neue BMW Diesel Generation
- http://www.femfat.com