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SPP 2013: Residual stresses in disc springs

The utilization of residual stresses induced by metal forming



In the Priority Programme 2013 scientific basics for potential applications of deformation-induced residual stresses will be developed. Residual stresses have a great influence on the performance of components produced by forming procedures. So far, they are considered as a factor to be avoided with a largely negative effect on the manufacturability and lifetime of components. The main objective of the Priority Programme is to control and tailor the amount and distribution of deformation-induced residual stresses, so that they have a positive influence on the relevant properties of the formed components.

Duration: 2018 until 2021

Subproject: Selective induction and stabilization of residual stresses in austenitic disc springs by incremental forming and integrated surface layer treatment

Disc springs are required to meet high fatigue resistance demands during their operation. Their fatigue resistance is limited by the operational tensile stresses. An induction of compressive residual stresses within tensile loaded areas contributes to the extension of their fatigue resistance. The application of conventional methods, like shot peening, are time and cost-intensive. The main objective of this project is to integrate the adjustment of residual stresses within the forming process of the disc springs in order to improve their resistance properties. For this purpose, a deeper understanding of the residual stresses formation during the incremental forming and their stability under static and cyclic loading is required. Also, deformation-induced martensite formation in metastable austenitic spring steels and its effect on residual stresses has to be characterized in general. A fast and reliable method for a more effective process chain monitoring will be developed by correlating the micromagnetic measurements with conventionally recorded residual stresses. Finally, by correlation of the manufacturing parameters with the micromagnetic measurements and the mechanical testing results, a model for the targeted adjustment of the residual stresses will be developed and established.

Duration: 2018 until 2021

Location & approach

The campus of TU Dort­mund University is located close to interstate junction Dort­mund West, where the Sauerlandlinie A45 (Frankfurt-Dort­mund) crosses the Ruhrschnellweg B1/A40. The best interstate exit to take from A45 is "Dort­mund-Eichlinghofen (6)" (closer to Campus Süd), and from B1/A40 "Dort­mund-Barop (44)" (closer to Campus Nord). Signs for the uni­ver­si­ty are located at both exits. Follow the signs towards Campus-Süd.

The Department of Materials Test Engineering (WPT) is located in the "Maschinenbau III" building, which can be reached via entrance 41, where parking spaces are available. The secretariat is located on the third floor in E 03 - room 3.027.

For the approach to the TU Dort­mund University you will find the navigation on Google Maps.

Address for navigation devices:

Baroper Straße 303

D-44227 Dort­mund

Germany

TU Dort­mund University has its own train station ("Dort­mund Uni­ver­si­tät"). From there, suburban trains (S-Bahn) leave for Dort­mund main station ("Dort­mund Hauptbahnhof") and Düsseldorf main station via the "Düsseldorf Airport Train Station" (take S-Bahn number 1). The uni­ver­si­ty is easily reached from Bochum, Essen, Mülheim an der Ruhr and Duisburg. From there, Campus Süd, where the Department of Materials Test Engineering (WPT) is located, can be reached in five minutes via the H-Bahn in the direction of "Eichlinghofen" or "Campus Süd".

After leaving the H-Bahn station "Campus Süd" cross the small street and go straight forward. Take the stairs (elevator on the left side).
Turn right directly under the canopy, go approximately 200 m, the Building "Maschinenbau III" is at the end of the path.

The office is located on the third floor in E03 - room 3.027.

Dort­mund's public transport company DSW21 offers an interactive route network map with timetable information.

The AirportExpress is a fast and convenient means of transport from Dort­mund Airport (DTM) to Dort­mund Central Station, taking you there in little more than 20 minutes. From Dort­mund Central Station, you can continue to the uni­ver­si­ty campus by interurban railway (S-Bahn). A larger range of in­ter­na­tio­nal flight connections is offered at Düsseldorf Airport (DUS), which is about 60 kilometres away and can be directly reached by S-Bahn from the uni­ver­si­ty station.

The H-Bahn is one of the hallmarks of TU Dort­mund University. There are two stations on Campus Nord. One ("Dort­mund Uni­ver­si­tät S") is directly located at the suburban train stop, which connects the uni­ver­si­ty directly with the city of Dort­mund and the rest of the Ruhr Area. Also from this station, there are connections to the "Technologiepark" and (via Campus Süd) Eichlinghofen. The other station is located at the dining hall at Campus Nord and offers a direct connection to Campus Süd every five minutes.

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