Forschungsheft zur Richtlinie Nichtlinear: Rechnerischer Bauteilfestigkeitsnachweis unter expliziter

FKM 2015
Issue No. 326
Project No. 301
292 pages

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Guideline Nonlinear: Computational component strength verification with explicit recording of nonlinear material deformation behavior
Final report

Abstract:
Within the scope of the project, investigations of the nonlinear deformation and failure behavior of the material groups steel and aluminum are carried out. The resulting findings form the basis for conducting strength verifications.
To this end, an extension of the static strength verification to non-linear analyses is first presented and failure limit curves for various degrees of multi-axiality are prepared and discussed. In addition, a safety concept and calculation examples are provided for the user.
In order to perform a fatigue strength verification based on the local concept, the non-linear cyclic-stabilized stress-strain behaviour is first examined and possibilities for estimating cyclic material parameters via tensile strength are presented. In addition, investigations are carried out to determine and modify damage parameter curves, which are comprehensibly and comprehensively prepared for the user.
As part of the local concept, various notch approximation formulas and other influencing variables for calculating the service life are then discussed and verified using experimental data. In addition to single-stage load sequences, operating load sequences are also examined and the calculation results are discussed.
The project concludes with a safety concept for secured, characteristic Wöhlerli-nien on the basis of estimated, cyclic material parameters for conservative estimation of the service life of components under operating load and various calculation examples for the user.
The objective of the research project has been achieved.
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Editor and author: 292 pp, 232 illus, 116 Tab.,143 Lit. 01.12.2012 31.05.2015 BMWi / IGF-Nr. 17612 TU DarmstadtInstitute of Steel Construction and Mechanics of Materials, IFSWHead: Prof. Dr.-Ing. Michael VormwaldFraunhofer Institute for Mechanics of Materials, IWMHead: Prof. Dr. Peter GumbschTU ClausthalInstitute of Mechanical Plant Engineering and Durability, IMABHead: Prof. Dr.-Ing.Alfons EsdertsDipl.-Ing. Menaie Fiedler, IFSWDr.-Ing. Igor Varfolomeev, IWMDipl.-Ing. Michael Wächter, IMAB
Chairman of the working group: Dr.-Ing. Manfred Bacher-Höchst, Robert Bosch GmbH Chairman of the FKM Board: Dipl.-Ing. H. Rauen,VDMA, Frankfurt