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New Approaches to Modal Transient Fatigue Analysis
Technical Paper
2000-01-3509
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Fatigue life estimates of automotive structures are often obtained using stress estimated from static solution methods such as inertia relief [1, 2]. This approach can provide reliable results if the natural frequencies of the system are at least twice that of the highest loading frequency. Direct and modal transient fatigue approaches would include dynamic effects but are not practical due to increased computer resource requirements.
This paper outlines a modified modal superposition based transient method. In this method, modal stress is obtained using a commercial FEA code. The transient solution is then obtained externally to significantly reduce computer requirements. Additionally, a numerical procedure is outlined which is capable of incorporating non-zero initial conditions for increased accuracy.
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Vellaichamy, S. and Keshtkar, H., "New Approaches to Modal Transient Fatigue Analysis," SAE Technical Paper 2000-01-3509, 2000, https://doi.org/10.4271/2000-01-3509.Data Sets - Support Documents
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References
- Reference Manual “MSC/NASTRAN Finite Element Analysis”
- User's Guide “MSC/Fatigue”
- Vellaichamy S. “Fast Fatigue Modal Transient Analysis” Technical Report 1999 DaimlerChrysler Corp.
- Durability News 2 1 nCode International
- Fatigue Seminar July 1999 LMS International
- Crescimanno, M.R Cavallo, P. “On Duty Simulation of a Trimmed Body under Dynamic Loads: Modal Superposition Approach to Evaluate Fatigue Life” SAE paper, 1999-01-3150