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319 results on '"Volk W"'

2. Potential of Ultra-High Performance Fiber Reinforced Concrete UHPFRC in Metal Forming Technology

Author

Holzer, K., Füchsle, F., Steinlehner, F., Ettemeyer, F., Volk, W., Behrens, Bernd-Arno, Series Editor, Grzesik, Wit, Series Editor, Ihlenfeldt, Steffen, Series Editor, Kara, Sami, Series Editor, Ong, Soh-Khim, Series Editor, Tomiyama, Tetsuo, Series Editor, Williams, David, Series Editor, Liewald, Mathias, editor, Verl, Alexander, editor, Bauernhansl, Thomas, editor, and Möhring, Hans-Christian, editor

Published
2023
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3. Optimization of the Calibration Process in Freeform Bending Regarding Robustness and Experimental Effort

Author

Scandola, L., Werner, M. K., Maier, D., Volk, W., Behrens, Bernd-Arno, Series Editor, Grzesik, Wit, Series Editor, Ihlenfeldt, Steffen, Series Editor, Kara, Sami, Series Editor, Ong, Soh-Khim, Series Editor, Tomiyama, Tetsuo, Series Editor, Williams, David, Series Editor, Liewald, Mathias, editor, Verl, Alexander, editor, Bauernhansl, Thomas, editor, and Möhring, Hans-Christian, editor

Published
2023
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12. Strategies for residual stress adjustment in bulk metal forming

Author

Franceschi, A., Stahl, J., Kock, C., Selbmann, R., Ortmann-Ishkina, S., Jobst, A., Merklein, M., Kuhfuß, B., Bergmann, M., Behrens, B.-A., Volk, W., Groche, P., Franceschi, A., Stahl, J., Kock, C., Selbmann, R., Ortmann-Ishkina, S., Jobst, A., Merklein, M., Kuhfuß, B., Bergmann, M., Behrens, B.-A., Volk, W., and Groche, P.

Abstract

The family of bulk forming technologies comprises processes characterised by a complex three-dimensional stress and strain state. Besides shape and material properties, also residual stresses are modified during a bulk metal forming process. The state of residual stresses affects important properties, like fatigue behaviour and corrosion resistance. An adjustment of the residual stresses is possible through subsequent process steps such as heat treatments or mechanical surface modification technologies, like shot peening and deep rolling. However, these additional manufacturing steps involve supplementary costs, longer manufacturing times and harmful effects on the product quality. Therefore, an optimized strategy consists in a targeted introduction of residual stresses during the forming processes. To enable this approach, a fundamental understanding of the underlying mechanisms of residual stress generation in dependence of the forming parameters is necessary. The current state of the art is reviewed in this paper. Strategies for the manipulation of the residual stresses in different bulk forming processes are classified according to the underlying principles of process modification.

Published
2024

44. Composite Casting and Characterization of Cu-Al Bilayer Compounds

Author

Pintore, M., Wölck, J., Mittler, T., Greß, T., Tonn, B., Volk, W., and Publica

Abstract

In this study, an experimental die casting setup is designed and various composite casting experiments are performed to create Cu-Al bilayer compounds. The influence of thermal conditions and Al/Cu volume ratio on the growth of intermetallic phases and the mechanical and electrical properties is investigated. A distinctive correlation, especially with the thickness of eutectic phase, is detected that increases with higher process temperatures and volume ratios. An increased phase thickness leads to higher electrical resistance, but on the other hand, no clear influence on shear or bending strength could be determined. However, large layers of brittle and hard phases negatively influence a successive forming process.

Published
2020

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