Journal: Forschung im Ingenieurwesen

Abbreviation

Forsch Ingenieurwes

Publisher

Springer

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ISSN

1434-0860
0015-7899

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Publications 1 - 8 of 8
  • Influence of process parameters on the residual stress state and properties in disc springs made by incremental sheet forming (ISF)
    Item type: Journal Article
    Afzal, Muhammad Junaid; Hajavifard, Ramin; Buhl, Johannes; et al. (2021)
    Forschung im Ingenieurwesen
    Disc springs are machine elements that are used when high forces need to be supplied and in limited installation space. They need to fulfil high demands on the stability of the spring characteristics, reliability and lifetime. In corrosive environments, metastable austenitic stainless steels (MASS) disc springs are often used. Tensile stresses that occur during service limit the lifetime of disc springs. Usually, their durability is enhanced by generating favorable compressive residual stresses using shot peening operations. Such operations lead to extra efforts and additional production costs. In this study, the adaptive and targeted generation of residual stresses via incremental sheet forming (ISF) is investigated as alternative to shot peening focusing on EN 1.4310 and EN 1.4401 stainless steel. Previous work has shown that ISF is capable of controlling the radial and tangential stresses in the springs. However, no analysis of the influence of the residual stress state in the rolled sheet strips and the ISF process parameters was performed. The goal of the current work is to analyze the evolution of residual stress during rolling and subsequent incremental forming of disc springs. In order to examine the role of dissipation and temperature increases in the rolling process, sheet blanks rolled at room and elevated temperature are analyzed. The characteristics of the compressive residual stresses induced by ISF are studied for different process parameters. X-ray diffraction is used to investigate the buildup of these stresses. Using ISF, the generation of compressive residual stresses can be integrated into the forming process of disc springs, and further post-treatment may be skipped. The results show that the residual stress state in the rolled material is crucial, which requires tight control of the rolling temperature. Another result is that ISF is able to yield high compressive residual stresses and improved spring characteristics when small tool diameters and step-down values are used.
  • Arbeitspunktabhängige Durchflussregelung einer rotatorischen Blutpumpe: Gain Scheduling Flow Control of a Rotary Blood Pump
    Item type: Journal Article
    Bergmann, Lukas; Rüschen, Daniel; Amacher, Raffael; et al. (2018)
    Forschung im Ingenieurwesen
  • Parametric identification of vehicle’s structural characteristics
    Item type: Journal Article
    Koulocheris, D.V.; Ntertimanis, Vasileios K.; Spentzas, C.N. (2008)
    Forschung im Ingenieurwesen
  • Analysis and optimization of a fixed-tank vehicle
    Item type: Journal Article
    Koulocheris, Dimitris V.; Dertimanis, Vasilis K.; Spentzas, Konstantinos N. (2006)
    Forschung im Ingenieurwesen
  • Evolutionary Parametric Identification of Dynamic Systems
    Item type: Journal Article
    Koulocheris, Dimitris V.; Dertimanis, Vasilis K.; Vrazopoulos, H. (2004)
    Forschung im Ingenieurwesen
  • Water hammer and condensation hammer scenarios in power plants using new measurement system
    Item type: Journal Article
    Dudlik, K.; Prasser, H.-M. (2010)
    Forschung im Ingenieurwesen
  • Propan/Isobutan-Gemische als alternative Kältemittel in Kompressionskältemaschinen: Eine experimentelle Untersuchung
    Item type: Journal Article
    Venzik, Valerius; Roskosch, Dennis; Atakan, Burak (2020)
    Forschung im Ingenieurwesen
  • Improving design engineers’ performance through novelly structured design guidelines: a study in and with industry
    Item type: Journal Article
    Reimlinger, Benedikt; Lohmeyer, Quentin; Moryson, Ralf; et al. (2020)
    Forschung im Ingenieurwesen
    Engineering design guidelines are a means of sharing knowledge and information explicitly. Past work points out that the structure of a design guideline is key to improve its usefulness, but that there is still a lack of a uniform specification. This paper presents a mobile eye tracking study with sixteen practitioners from industry and investigates how novelly structured design guidelines, which aim to support the embodiment design of screw joints, impact design engineers’ performance. A baseline group with access to a former design guideline and a follow-up group with access to a novel design guideline structure were compared. Results show that design engineers’ performance during embodiment design was improved through access to the novel structure, compared to the performance of those participants with access to the former design guideline structure. The novel structure allowed design engineers to spend less time on the design guideline, while achieving significantly better designs at the same time.
Publications 1 - 8 of 8