Product Information
- Author
- Herausgeber FKM
- EAN
- 4250697510429
- Edition
- 2002
- Delivery time
- next business day
Lebensdauerberechnung von Bauteilen bei mehraxialer Betriebsbelastung
360.00 EUR *
Gesamtpreis: 360.00 EUR *
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336.45 EUR excl. VAT
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Description
Lebensdauerberechnung von Bauteilen bei mehraxialer Betriebsbelastung
FKM 2002
Issue No. 271
Project No. 235
Abstract:
The first step of the project was to analyze the hypotheses and procedures underlying the multiaxial modules of commercial programs and the procedures of the research institutes. Subsequently, service life calculations were carried out on six selected multiaxially stressed components on the basis of the local stresses at the failure-critical points. The stress time periods and the material properties were specified uniformly for this purpose. The calibration calculations show that the observed shortening of service life with rotating principal stress direction in ductile materials is not covered by any hypothesis in the commercial programs and that there is also a large scatter in the calculated results. The increase in service life for brittle materials is also subject to a large scatter in the calculations. The comparison of the calculations with the test results shows that for stress situations with locally small changes in the main stress direction, i.e. locally quasi-proportional stress, service life estimates with a factor of -/+ 2 compared to the experimental service life can be made using suitable methods. The further comparisons between calculation and test with larger angular changes in the main stress direction show in some cases large uncertainties and deviations from the experimentally determined service life. Final report The original approach of evaluating the service life calculation methods for multiaxial loading could only be partially fulfilled, as it has been shown that the mathematical evaluation of multiaxial stress states is only one factor among many in the calculation chain from loading to service life estimation for a component. Compared to the experimental result, the inadequacies of the multiaxiality hypotheses in the calculation are often masked by sources of error from unsuitable FE models, inaccurate material data, the damage accumulation calculation or, for example, medium stress or residual stress influences that are not taken into account. The objective of the research project has been achieved. Chairwoman of the working group:
Head of FK Bauteilfestigkeit:
252 p., 145 fig. and tab., 70 lit. 01.04.1999 31.03.2002 BMWIfAiF-Nr. 12 043 N Institute for Mechanical Plant Engineering and Structural Durability at ClausthallMAB Technical University, Clausthal Prof. Dr.-lng. H. Zenner (in charge) Project management:
Dipl.-lng. F. Yousefi Fraunhofer Institute for Structural Durability LBF, Darrnstadt Prof. Dr.-lng. Holger Hanselka Project management:
Prof. Dr.-lng. Cetin Morris Sonsino Dipl.-lng. F. Yousefi Dipl.-lng. M. Küppers Chairman of the Advisory Board:
Dr.-lng. T. Jung, Volkswagen AG Dr.-lng. C. Gerdes, ALSTOM Schweiz AG Dr.-lng. E.h. J. Rabe, Höchstadt
Issue No. 271
Project No. 235
Abstract:
The first step of the project was to analyze the hypotheses and procedures underlying the multiaxial modules of commercial programs and the procedures of the research institutes. Subsequently, service life calculations were carried out on six selected multiaxially stressed components on the basis of the local stresses at the failure-critical points. The stress time periods and the material properties were specified uniformly for this purpose. The calibration calculations show that the observed shortening of service life with rotating principal stress direction in ductile materials is not covered by any hypothesis in the commercial programs and that there is also a large scatter in the calculated results. The increase in service life for brittle materials is also subject to a large scatter in the calculations. The comparison of the calculations with the test results shows that for stress situations with locally small changes in the main stress direction, i.e. locally quasi-proportional stress, service life estimates with a factor of -/+ 2 compared to the experimental service life can be made using suitable methods. The further comparisons between calculation and test with larger angular changes in the main stress direction show in some cases large uncertainties and deviations from the experimentally determined service life. Final report The original approach of evaluating the service life calculation methods for multiaxial loading could only be partially fulfilled, as it has been shown that the mathematical evaluation of multiaxial stress states is only one factor among many in the calculation chain from loading to service life estimation for a component. Compared to the experimental result, the inadequacies of the multiaxiality hypotheses in the calculation are often masked by sources of error from unsuitable FE models, inaccurate material data, the damage accumulation calculation or, for example, medium stress or residual stress influences that are not taken into account. The objective of the research project has been achieved. Chairwoman of the working group:
Head of FK Bauteilfestigkeit:
252 p., 145 fig. and tab., 70 lit. 01.04.1999 31.03.2002 BMWIfAiF-Nr. 12 043 N Institute for Mechanical Plant Engineering and Structural Durability at ClausthallMAB Technical University, Clausthal Prof. Dr.-lng. H. Zenner (in charge) Project management:
Dipl.-lng. F. Yousefi Fraunhofer Institute for Structural Durability LBF, Darrnstadt Prof. Dr.-lng. Holger Hanselka Project management:
Prof. Dr.-lng. Cetin Morris Sonsino Dipl.-lng. F. Yousefi Dipl.-lng. M. Küppers Chairman of the Advisory Board:
Dr.-lng. T. Jung, Volkswagen AG Dr.-lng. C. Gerdes, ALSTOM Schweiz AG Dr.-lng. E.h. J. Rabe, Höchstadt
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