Product Information
- Author
- Herausgeber FKM
- EAN
- 4250697513109
- Edition
- 1997
- Delivery time
- next business day
Berechnung der Anriss- und Rissfortschrittslebensdauer gekerbter Bauteile nach einem einheitlichen K
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Description
Berechnung der Anriss- und Rissfortschrittslebensdauer gekerbter Bauteile nach einem einheitlichen K
FKM 1997
Issue No. 229
Project No. 188
Final Report
Abstract:
In this research project, a uniform plastic J-integral related crack propagation model for the calculation of the crack initiation and crack propagation life, taking into account the crack opening and crack closing behavior, has been developed. It has been possible to numerically describe both phases of the service life for single-stage, two-stage and service load tests on notched disks. The crack initiation and crack propagation phases within the notch area are of particular importance, as a considerable part of the overall service life of notched components is often determined by the growth of cracks within the notch area. For the development of the model, formulas, algorithms and approximation formulas first had to be developed to describe the crack opening and closing behavior and to calculate the stress intensity factor K and the J-integral of cracks in notches. These were compared with experiments for crack opening and with two- and three-dimensional elastic-plastic FE calculations for the stress intensity factors K and the J integrals. Good to very good agreement was achieved in both cases. The crack propagation concept allows the calculation of the crack propagation life from a given initial crack configuration (crack type, length, depth) to a critical final crack configuration. It thus includes the crack initiation and crack propagation phases inside and outside (long crack growth) the notch area. The crack propagation curves determined with a crack propagation calculation program developed during the course of this research project, as well as the crack initiation and fracture growth lines, were compared with those determined experimentally. Good to very good agreement was found for the one- and two-stage tests as well as for the service load-like tests.
Scope of the report:
127 p., 61 fig., 26 tab., 127 lit. Appendix: 72 p., 28 fig., 1 tab
Author and editor:
Dipl.-lng. M. Dankert
Working group representatives:
Dr.-lng. A. Bäumei, Mercedes-Benz AG, Sindelfingen Dr.-lng. C. Gerdes ABB Kraftwerke AG, CH-Baden
Chairman of the Advisory Board:
Prof. Dr.-lng. H. Kipphan, Heidelberger Druckmaschinen AG, Heidelberg
Start of work:
01 .07. 1994
End of work:
30. 06. 1997
Funding body:
AiF-Nr.9867 Research unit: Department of Mechanics of Materials Technical University Darmstadt
Management:
Prof. Dr.-lng. T. Seeger
Issue No. 229
Project No. 188
Final Report
Abstract:
In this research project, a uniform plastic J-integral related crack propagation model for the calculation of the crack initiation and crack propagation life, taking into account the crack opening and crack closing behavior, has been developed. It has been possible to numerically describe both phases of the service life for single-stage, two-stage and service load tests on notched disks. The crack initiation and crack propagation phases within the notch area are of particular importance, as a considerable part of the overall service life of notched components is often determined by the growth of cracks within the notch area. For the development of the model, formulas, algorithms and approximation formulas first had to be developed to describe the crack opening and closing behavior and to calculate the stress intensity factor K and the J-integral of cracks in notches. These were compared with experiments for crack opening and with two- and three-dimensional elastic-plastic FE calculations for the stress intensity factors K and the J integrals. Good to very good agreement was achieved in both cases. The crack propagation concept allows the calculation of the crack propagation life from a given initial crack configuration (crack type, length, depth) to a critical final crack configuration. It thus includes the crack initiation and crack propagation phases inside and outside (long crack growth) the notch area. The crack propagation curves determined with a crack propagation calculation program developed during the course of this research project, as well as the crack initiation and fracture growth lines, were compared with those determined experimentally. Good to very good agreement was found for the one- and two-stage tests as well as for the service load-like tests.
Scope of the report:
127 p., 61 fig., 26 tab., 127 lit. Appendix: 72 p., 28 fig., 1 tab
Author and editor:
Dipl.-lng. M. Dankert
Working group representatives:
Dr.-lng. A. Bäumei, Mercedes-Benz AG, Sindelfingen Dr.-lng. C. Gerdes ABB Kraftwerke AG, CH-Baden
Chairman of the Advisory Board:
Prof. Dr.-lng. H. Kipphan, Heidelberger Druckmaschinen AG, Heidelberg
Start of work:
01 .07. 1994
End of work:
30. 06. 1997
Funding body:
AiF-Nr.9867 Research unit: Department of Mechanics of Materials Technical University Darmstadt
Management:
Prof. Dr.-lng. T. Seeger
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