Dr.-Ing. Oliver Hering
Head of Department

Baroper Str. 303
MB III / Raum 4.029
Campus Süd
44227 Dortmund
Dortmund

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+49 231 755 8432

Key activities

Cold forging
Damage
Product performance

Projects

Influencing the Evolution of Damage in Cold Extrusion

 

Publications

2020
Clausmeyer, T., Schowtjak, A., Gitschel, R., Wang, S., Hering, O., Pavliuchenko, P., Lohmar, J., Ostwald, R., Hirt, G., Tekkaya, A. E., 2020. Prediction of Ductile Damage in the Process Chain of Caliber Rolling and Forward Rod Extrusion. Procedia Manufacturing 47, pp. 649-655.
Gitschel, R., Kolpak, F., Hering, O., Tekkaya, A. E., 2020. Increasing the Lightweight Potential of Composite Cold Forging by Utilizing Magnesium and Granular Cores. Metals 11 (1), 32, DOI: 10.3390/met11010032.
Hering, O., Tekkaya, A. E., 2020. Damage-induced performance variations of cold forged parts. Journal of Materials Processing Technology 279, 116556.
Langenfeld, K., Schowtjak, A., Schulte, R., Hering, O., Möhring, K., Clausmeyer, T., Ostwald, R., Walther, F., Tekkaya, A. E., Mosler, J., 2020. Influence of anisotropic damage evolution on cold forging. Production Engineering 14 (1), pp. 115–121.
Samfaß, L., Baak, N., Meya, R., Hering, O., Tekkaya, A. E., Walther, F., 2020. Micro-magnetic damage characterization of bent and cold forged parts. Production Engineering 14 (1), pp. 77-85.
Schowtjak, A., Wang, S., Hering, O., Clausmeyer, T., Lohmar, J., Schulte, R., Ostwald, R., Hirt, G., Tekkaya, A. E., 2020. Prediction and analysis of damage evolution during caliber rolling and subsequent cold forward extrusion. Production Engineering 14 (1), pp. 33-41.
2019
Hering, O., Kolpak, F., Dahnke, C., Tekkaya, A. E., 2019. High Strain Flow Curves by Mechanical Tests on Specimens Pre-strained by Forward Rod Extrusion. In: Proceedings of the 52nd ICFG Plenary Meeting, 15-18 September 2019, Donostia-San Sebastian, Spain. (Digital)
Hering, H., Kolpak, F., Tekkaya, A.E., 2019. Flow curves up to high strains considering load reversal and damage. International Journal of Material Forming.  DOI: 10.1007/s12289-018-01466-z
Kolpak, F., Hering, O., Dahnke, C., Tekkaya, A. E., 2019. Producing Hollow Shafts by Composite Extrusion Utilizing Granular Cores. In: Proceedings of the 52nd ICFG Plenary Meeting, 15-18 September 2019, Donostia-San Sebastian, Spain. (Digital)
2018
Meya, R., Löbbe, C., Hering, O., Tekkaya, A. E., 2018. Bleche biegen unter radialer Druckspannung. Umformtechnik (1), pp. 14-15.
Hering, O., Dahnke, C., Ben Khalifa, N., Tekkaya, A. E., 2018. Analysing damage evolution in cold forging by means of triaxiality and lode parameter. 8th JSTP International Seminar on Precision Forging. 05.-08.03.2018, Nagoya, Japan, pp. 121-124.
Hering, O., Dahnke, C., Tekkaya, A. E., 2018. Influence of Damage on the Properties of Cold Forged Parts. In: Proceedings of 51st ICFG Plenary Meeting, Columbus, USA, pp. 137-144.
2017
Meya, R., Löbbe, C., Hering, O., Tekkaya, A. E., 2017. New Bending Process with Superpostition of Radial Stresses for Damage control. In: 10 th Forming Technology Forum Model Based Control for Smart Forming Processes, Enschede, The Netherlands, pp. 81-85.
Tekkaya, A. E., Ben Khalifa, N., Hering, O., Meya, R., Myslicki, S., Walther, F., 2017. Forming-induced damage and its effects on product properties. CIRP Annals – Manufacturing Technology 66, pp. 281-284.
Hering, O., Ossenkemper, S., Dahnke, C., Tekkaya, A. E., Nadolski, D., Schulz, A., Zoch, H. - W., 2017. Distortion Induced by Cold Forging and Subsequent Heat Treatment. SCT 2017, 18.-22.06.2017, Amsterdam, Niederlande.
Hering, O., Ossenkemper, S., Dahnke, C., Tekkaya, A. E., Nadolski, D.,  Schulz, A., Hoffmann, F., Zoch, H., 2017. Gezielte Prozesssteuerung bei der Kaltmassivumformung und Wärmebehandlung zur Minimierung des Verzugs. 06.04.2017.
2016
Löbbe, C., Hering, O., Hiegemann, L., Tekkaya, A. E., 2016. Setting Mechanical Properties of High Strength Steels for Rapid Hot Forming Processes. Materials 9, p. 229.