@inproceedings{21452,
  author       = {{Homberg, Werner and Rostek, Tim and Schaper, Mirko and Grydin, Olexandr and Andreiev, Anatolii and Brosius, Alexander and Tulke, Marc}},
  number       = {{1}},
  publisher    = {{AIP Publishing}},
  title        = {{{Development of hybrid directionally reinforced structural parts for lightweight applications}}},
  doi          = {{10.1063/1.5008055}},
  volume       = {{1896}},
  year         = {{2017}},
}

@inproceedings{21453,
  author       = {{Rostek, Tim and Homberg, Werner}},
  editor       = {{Allwood, J.}},
  issn         = {{1877-7058}},
  pages        = {{2185--2190}},
  publisher    = {{Elsevier Ltd}},
  title        = {{{Locally Graded Steel Materials for Self-Sharpening Cutting Blades}}},
  doi          = {{10.1016/j.proeng.2017.10.979}},
  volume       = {{207}},
  year         = {{2017}},
}

@article{30259,
  author       = {{Wiens, Eugen and Homberg, Werner}},
  issn         = {{1877-7058}},
  journal      = {{Procedia Engineering}},
  keywords     = {{Applied Mathematics}},
  pages        = {{1755--1760}},
  publisher    = {{Elsevier BV}},
  title        = {{{Internal Flow-Turning – a new approach for the manufacture of tailored tubes with a constant external diameter}}},
  doi          = {{10.1016/j.proeng.2017.10.934}},
  volume       = {{207}},
  year         = {{2017}},
}

@inproceedings{30261,
  author       = {{Wiens, Eugen and Homberg, Werner}},
  booktitle    = {{Proceedings of the International Conference on Steels in Cars and Trucks SCT 2017}},
  location     = {{Amsterdam}},
  title        = {{{Internal flow-turning – efficient manufacture of load-adapted tubes with a constant external diameter}}},
  year         = {{2017}},
}

@article{21466,
  author       = {{Rostek, Tim and Homberg, Werner}},
  journal      = {{International Journal of Material Forming}},
  title        = {{{Layered Steel Materials for the Manufacture of Self-Sharpening Cutting Blades}}},
  year         = {{2016}},
}

@inproceedings{21467,
  author       = {{Homberg, Werner and Rostek, Tim}},
  title        = {{{Innovative Processing Techniques for the Manufacture of High-Performance Active Elements from Ultra High-Strength Steel Plate}}},
  year         = {{2015}},
}

@inproceedings{21454,
  abstract     = {{<jats:p>In order to optimise the material utilisation and improve the lightweight design of automotive parts tailored hollow profiles are needed, especially as semi-finished parts for hydroforming. Internal Flow-Turning is an innovative incremental forming technology which enables the manufacture of tubes featuring a varying wall thickness and a constant outer diameter. These characteristics facilitate the material feed at hydroforming processes significantly. In addition, the spinning-related forming technology improves the mechanical material properties, shape and dimensional accuracy, and the surface quality of parts produced.</jats:p>}},
  author       = {{Homberg, Werner and Rostek, Tim and Wiens, Eugen}},
  booktitle    = {{Key Engineering Materials}},
  editor       = {{Merklein, M. and Duflou, J. R. and Leacock, A. G. and Micari, M. and Hagenah, H. }},
  issn         = {{1662-9795}},
  pages        = {{65--70}},
  publisher    = {{Trans Tech Publications Ltd}},
  title        = {{{Internal Flow-Turning - An Innovative Technology for the Manufacture of Tailored Tubes}}},
  doi          = {{10.4028/www.scientific.net/kem.639.65}},
  volume       = {{639}},
  year         = {{2015}},
}

@book{21469,
  author       = {{Homberg, Werner and Rostek, Tim}},
  publisher    = {{Verlag und Vertriebsgesellschaft mbH}},
  title        = {{{Hochleistungsaktivelemente für landwirtschaftliche Maschinen aus ultrahochfestem Stahl}}},
  year         = {{2013}},
}

@article{21455,
  abstract     = {{<jats:p>nnovative ultra high-strength steels have excellent mechanical properties which commonly relate to the materials martensitic microstructure. As thermal heat treatments are state-of-the-art for obtaining the desired microstructure, innovative thermo-mechanical treatments are likely to give rise to even better material qualities. This article highlights various aspects of innovative thermo-mechanical hardening strategies for the processing of ultra high-strength steels, involving both press hardening and friction spinning operations.</jats:p>}},
  author       = {{Homberg, Werner and Rostek, Tim}},
  issn         = {{1662-9795}},
  journal      = {{Key Engineering Materials}},
  pages        = {{133--140}},
  title        = {{{Thermo-Mechanical Hardening of Ultra High-Strength Steels}}},
  doi          = {{10.4028/www.scientific.net/kem.549.133}},
  year         = {{2013}},
}

@inproceedings{21468,
  author       = {{Homberg, Werner and Rostek, Tim}},
  publisher    = {{Proc. IDDRG 2013}},
  title        = {{{Processing of Ultra High-Strength Steels involving Thermo-mechanical Hardening Effects}}},
  year         = {{2013}},
}

@book{21470,
  author       = {{Tekkaya, A. Erman and Mennecart, Thomas and Witulski, Jörg and Homberg, Werner and Rostek, Tim}},
  publisher    = {{Verlag und Vertriebsgesellschaft mbH}},
  title        = {{{Presshärten von Rohren und Profilen mittels formlos festen Stoffen}}},
  year         = {{2012}},
}

@article{15984,
  abstract     = {{<jats:p>A new and promising approach to the reduction of greenhouse gas emissions is the use of improved lightweight constructions based on multi-material systems comprising sheet metal with local carbon fibre reinforced plastic (CFRP) reinforcements. The CFRP is used to reinforce highly stressed areas and can be aligned to specific load cases. The locally restricted application of CFRP means that the material costs can be effectively reduced by comparison to parts made entirely of CFRP on account of the expensive production process requiring the use of an autoclave. These parts are thus only used in high-priced products. The production of hybrid CFRP steel structures in a mass production process calls for an efficient production technology. Current research work within the scope of a collaborative research project running at the University of Paderborn is concentrating on the development of manufacturing processes for the efficient production of automotive structural components made up of sheet metal blanks with local CFRP patches. The project is focusing especially on basic research into the production of industrial components. The aim of the investigation is to create an efficient and controlled process for producing CFRP reinforced steel structures from semi-finished hybrid steel-CFRP material. This includes tool concepts and an appropriate process design to permit short process times. The basis of an efficient process design is an in-depth knowledge of the material behaviour, and hence a thorough characterisation was performed. Material parameters were determined for both simulation and forming. For this, monotonic tensile, shear and bending tests were conducted using both uncured prepregs and cured CFRP specimens. To achieve an accurate simulation of the forming process, a special material model for carbon fibre prepregs has been developed which also includes the anisotropic material behaviour resulting from fibre orientation, the viscoelastic behaviour caused by the matrix and the hardening effects that prevail during curing. Recent results show good qualitative agreement and will be presented in this paper. In order to control the properties of the hybrid components, four different tool concepts for the prepreg press technology have been developed and tested. The concepts are presented and the results of experimental investigations are discussed in this paper.</jats:p>}},
  author       = {{Schmidt, Hans Christian and Damerow, Ulf and Lauter, Christian and Gorny, Bernhard and Hankeln, Frederik and Homberg, Werner and Tröster, Thomas and Maier, Hans Jürgen and Mahnken, Rolf}},
  issn         = {{1662-9795}},
  journal      = {{Key Engineering Materials}},
  pages        = {{295--300}},
  title        = {{{Manufacturing Processes for Combined Forming of Multi-Material Structures Consisting of Sheet Metal and Local CFRP Reinforcements}}},
  doi          = {{10.4028/www.scientific.net/kem.504-506.295}},
  year         = {{2012}},
}

@inproceedings{15986,
  author       = {{Gorny, B. and Hankeln, Frederik and Lauter, Christian and Schmidt, H. C. and Damerow, U. and Mahnken, Rolf and Maier, H. J. and Tröster, Thomas and Homberg, Werner}},
  location     = {{Turin, Italy}},
  title        = {{{Simulation and manufacturing of deep drawn parts reinforced by carbon fibre prepregs}}},
  year         = {{2012}},
}

@article{21456,
  abstract     = {{<jats:p>This article will highlight various aspects of the production process of high performance active elements made of ultra high-strength steels. Focus is put on the processing of thick sheet metal regarding hot forming by means of punching, embossing, and forging processes as well as on thermo-mechanical treatment. Due to the material thickness of the semi-finished parts/blanks used and owing to the high strength of the materials (Rm &gt; 2600 MPa) current production techniques and parameters from the field of thin sheet metal can only be limitedly be transferred and have therefore been specially investigated for this application.</jats:p>}},
  author       = {{Homberg, Werner and Rostek, Tim}},
  issn         = {{1662-9795}},
  journal      = {{Key Engineering Materials}},
  pages        = {{229--234}},
  title        = {{{High Performance Active Elements for Agricultural Machines Made of Ultra High-Strength Steels}}},
  doi          = {{10.4028/www.scientific.net/kem.473.229}},
  year         = {{2011}},
}

@inproceedings{21472,
  author       = {{Mennecart, Thomas and Rostek, Tim and Witulski, Jörg and Brosius, Alexander and Takkaya, A. Erman and Homberg, Werner}},
  publisher    = {{Meisenbach}},
  title        = {{{Presshärten von Rohren und Profilen mittels formlos fester Stoffe}}},
  year         = {{2011}},
}

@inproceedings{21474,
  author       = {{Homberg, Werner and Rostek, Tim}},
  booktitle    = {{Proceedings. of the 10th International Conference on Technology of Plasticity (ICTP)}},
  publisher    = {{Springer}},
  title        = {{{High Performance Active Elements for Agricultural Machines Made of Ultra High-Strength Steels}}},
  year         = {{2011}},
}

@inproceedings{15970,
  author       = {{Lauter, Christian and Damerow, Ulf and Frantz, Meike and Tröster, Thomas and Homberg, Werner}},
  location     = {{Köln}},
  title        = {{{Produktionsverfahren zur Herstellung höchstfester hybrider Leichtbaustrukturen für den Einsatz im Automobil}}},
  year         = {{2011}},
}

@inproceedings{15991,
  author       = {{Lauter, Christian and Dau, J. and Tröster, Thomas and Homberg, Werner}},
  location     = {{Porto, Portugal}},
  title        = {{{Manufacturing processes for automotive structures in multi-material design consisting of sheet metal and CFRP prepregs}}},
  year         = {{2011}},
}

@inproceedings{15994,
  author       = {{Dau, J. and Lauter, Christian and Damerow, U. and Homberg, Werner and Tröster, Thomas}},
  location     = {{Jeju Island, Korea}},
  title        = {{{Multi-material systems for tailored automotive structural components}}},
  year         = {{2011}},
}