IGF-17886 N
Title of the research project
Development of a DASt-Guideline for High Frequency Mechanical Impact Treatments
Project number of the research project
IGF-17886 N
Summary
In the last few years there have been investigations by different research institutions on the quantification of fatigue improvement on welds by the application of high frequency mechanical impact treatment. Those investigations resulted in different design approaches. Nevertheless there are still some open questions, which should be cleared before developing one uniform design approach considering all investigations. For example the mean stress influence is not completely quantified yet. Besides the influence of the scale effect, by now being considered with a reduction of the fatigue strength of 20 %, which is rather conservative, the effectivity of a post-weld treatment of a preloaded weld is investigated as well as the influence of a multi-level load.
These effects will be quantified with the help of numerical models and experimental tests. Application limits and boundary conditions for the HFMI treatment could be identified. With the knowledge gained, a design concept was developed based on existing approaches for application to three essential notch details, taking into account the relevant influences and boundary conditions. This concept is finally submitted to the DASt in form of a recommendation for a guideline.
Involved research teams
- Institute of Structural Design, University of Stuttgart
- Chair of Steel and Leightweight Structures, Research Center for Steel, Timber and Masonry, Karlsruher Institute of Technology
Research funding
- DASt
- AiF
- MPA Universität Stuttgart
- Stahlwerk Thüringen GmbH, Unterwellenborn
- Peiner Träger GmbH, Peine
- Eiffel Deutschland Stahltechnologie GmbH, Hannover
- Pitec GmbH
- Dynatec GmbH
- VOEST Alpine
Duration of the research project
01.10.2013 – 30.09.2017