Product Information
- Author
- Herausgeber FKM
- EAN
- 4250697513291
- Edition
- 2010
- Delivery time
- next business day
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Description
Gewindeverbindungen örtlich
FKM 2010Booklet No. 309Project No. 279
Member price visible after registration Final report
Abstract:
Threaded connections are among the most important connections in mechanical engineering. However, threads represent sharp notches for components, which can be critical to failure under cyclic loading due to the high notch effect. The fatigue strength of the classic screw-nut connection can be described very well by the nominal stress concept, but general threaded connections have so far been difficult to evaluate using existing fatigue strength concepts.
For the design of general threaded connections, it is crucial to have a concept that takes the special stress conditions in the thread into account with sufficient accuracy. The notch stress concept, which has been known for several decades, can be used for this purpose. However, there is little experience to date with regard to the local evaluation of threaded connections.
In this project, it was shown that the local concept can be applied accurately to general threaded connections under high preloads and constant amplitudes. An evaluation according to principal stresses and an assessment using the damage parameter proved to be the most appropriate. A simple concept for the consideration of local relaxation processes is presented. The crack propagation cycles must also be taken into account in order to accurately map the fatigue strength range.
The evaluation concept is applied to both classic bolt-nut connections and threaded connections in which the nut fails, and verified using S-N curves determined by testing. For all joint types, the theoretically predicted fracture S-N curves show good agreement with the experimentally determined reference S-N curves.
The objective of the research project has been achieved.
Scope of report:
180 p., 235 fig., 47 tab., 57 lit. Start of work:
01.10.2007
End of work:
31.03.2010
Funding body:
BMWi / AiF 15365 N
Research unit:
Institut für Werkstoffkunde, TU-Darmstadt,
Head: Prof. Dr. C. Berger
Processors and authors:
Dipl.- Ing. R. Schneider, Dr.-Ing.Ing. R. Schneider, Dr.-Ing. U. Wuttke
Chairman of the working group:
Dr.-Ing. S. Issler, Robert Bosch GmbH, Schwieberdingen
Chairman of the FKM Board:
Dipl.-Ing. H. Linn, LINN HIGH Therm GmbH, Hirschbach
Member price visible after registration Final report
Abstract:
Threaded connections are among the most important connections in mechanical engineering. However, threads represent sharp notches for components, which can be critical to failure under cyclic loading due to the high notch effect. The fatigue strength of the classic screw-nut connection can be described very well by the nominal stress concept, but general threaded connections have so far been difficult to evaluate using existing fatigue strength concepts.
For the design of general threaded connections, it is crucial to have a concept that takes the special stress conditions in the thread into account with sufficient accuracy. The notch stress concept, which has been known for several decades, can be used for this purpose. However, there is little experience to date with regard to the local evaluation of threaded connections.
In this project, it was shown that the local concept can be applied accurately to general threaded connections under high preloads and constant amplitudes. An evaluation according to principal stresses and an assessment using the damage parameter proved to be the most appropriate. A simple concept for the consideration of local relaxation processes is presented. The crack propagation cycles must also be taken into account in order to accurately map the fatigue strength range.
The evaluation concept is applied to both classic bolt-nut connections and threaded connections in which the nut fails, and verified using S-N curves determined by testing. For all joint types, the theoretically predicted fracture S-N curves show good agreement with the experimentally determined reference S-N curves.
The objective of the research project has been achieved.
Scope of report:
180 p., 235 fig., 47 tab., 57 lit. Start of work:
01.10.2007
End of work:
31.03.2010
Funding body:
BMWi / AiF 15365 N
Research unit:
Institut für Werkstoffkunde, TU-Darmstadt,
Head: Prof. Dr. C. Berger
Processors and authors:
Dipl.- Ing. R. Schneider, Dr.-Ing.Ing. R. Schneider, Dr.-Ing. U. Wuttke
Chairman of the working group:
Dr.-Ing. S. Issler, Robert Bosch GmbH, Schwieberdingen
Chairman of the FKM Board:
Dipl.-Ing. H. Linn, LINN HIGH Therm GmbH, Hirschbach
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