This content is not included in your SAE MOBILUS subscription, or you are not logged in.
On Duty Simulation of a Trimmed Body Under Dynamic Loads: Modal Superposition Approach to Evaluate Fatigue Life
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 28, 1999 by SAE International in United States
Annotation ability available
The prediction of fatigue induced failures on thin metal sheet structures subjected to random dynamic loads is a challenging task to perform through CAE tools; with this aim an integrated numerical methodology has been developed to evaluate the durability of a trimmed car body and the related damage distribution during fatigue tests. The method firstly evaluates the interaction between the dynamic behavior of the structure and the load spectrum, checking for potential overlapping among the structure natural frequencies and the loads main frequencies, with possible occurrence of resonance phenomena. Then the time-dependent stresses are computed combining in a transient analysis the stress mode shapes and the modal influence coefficients, superposing the static stresses induced by constant loads, thus obtaining the stress/strain time-histories needed in a high-cycle fatigue life evaluation.
CitationCrescimanno, M., Cavallo, P., and Pasetti, F., "On Duty Simulation of a Trimmed Body Under Dynamic Loads: Modal Superposition Approach to Evaluate Fatigue Life," SAE Technical Paper 1999-01-3150, 1999, https://doi.org/10.4271/1999-01-3150.
- Ewins “Modal testing: theory and practice” Research Studies Press LTD. Taunton, Somerset, England 0-86380-017-3
- Gopalakrishnan Agrawai “Durability analysis of full automotive body structures” SAE Tecnical Paper Series n. 930568
- MSC/NASTRAN: Reference Manual
- LMS/FALANCS: Reference Manual
- CRF: Internal Reports
- Papadopoulos “Selection of a multiaxial fatigue life prediction methodology: a review of existing theories”
- Papadopoulos Davoli Gorla Filippini Bernasconi “A comparative study of multi-axial fatigue criteria for metals”
- Dowling “Engineering methods for deformation, fracture and fatigue” Prentice-Hall Englewood Cliffs, New Jersey 1993 0-13-579046-8
- ASM Handbook 19 “Fatigue and fracture” ASM International Materials Park, OH 0-87170--385-8