Dr Denis Politis

Research Area

Research Associate for EU FP7 project 'LoCoLite' and H2020 'LoCoMaTech' to apply the solution Heat treatment, cold die Forming and Quenching (HFQ) aluminium sheet stamping process to mass-produced automotive and aerospace components.

Previous research involved the development of lightweight multi-material gears produced through the forging technique with the aim of reduced weight whilst maintaining mechanical performance.

Research Keywords

• HFQ
• Sheet forming
• Forging
• Lightweight Gears
• Modelling

Qualifications

• 2014: PhD in Mechanical Engineering, Imperial College London
• 2010: MEng (1st Class) in Mechanical Engineering, Imperial College London

Professional Associations

• Fellow of the Higher Education Academy                                                  2018-present
• Chartered Engineer and Member of the Institution of Mechanical Engineers     2016-present

Editorial Advisory Roles - Reviewer

Verified peer reviewer: https://publons.com/author/1306283/denis-politis

• Reviewer of the journal Metals, http://www.mdpi.com/journal/metals         2018 – Present
• Reviewer of the Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, http://journals.sagepub.com/home/pib    2017 – Present
• Reviewer of the 36th IDDRG 2017 Materials Modelling and Testing for Sheet Metal Forming - LoCoMaTech Mini-Symposium, https://iddrg2017.de/                       2017

Industry Experience

Worked at Hellenic Aerospace Industries in the Aero-engines, Aircraft Maintenance and Composites Divisions

Contact Details

Email: denis.politis06@imperial.ac.uk

Publications List

• Politis, D.J., Politis, N.J., Lin, J., Dean, T.A. (2018) A review of force reduction methods in precision forging axisymmetric shapes. International Journal of Advanced Manufacturing Technology, 97(5-8), 2809-2833.
• Zheng, K., Politis, D.J., Wang, L., Lin, J. (2018) A review on forming techniques for manufacturing lightweight complex—shaped aluminium panel components. International Journal of Lightweight Materials and Manufacture, 1(2), 55-80.
• Kopec M., Wang, K., Politis, D.J., Wang, Y., Wang, L., Lin, J. (2018) Formability and microstructure evolution mechanisms of Ti6Al4V alloy during a novel hot stamping process. Material Science and Engineering A, 719, 72-81.
• He, E., Liu, J., Lee, J., Wang, K., Politis, D.J., Chen, L., Wang, L. (2018) Effect of porosities on tensile properties of laser-welded Al–Li alloy: an experimental and modelling study. International Journal of Advanced Manufacturing Technology, 95(1-4), 659-671.
• Wang, K., Liu, G., Politis, D.J., Wang, L. (2017) Correlation between Softening Mechanisms and Deformation Non-uniformity of Laser-welded Titanium Alloy Tube during Gas Bulging Process. Materials Characterization, 133, 196-205.
• Wang, K., Liu, G., Huang, K., Politis, D.J., Wang, L. (2017) Effect of Recrystallization on Hot Deformation Mechanism of TA15 Titanium Alloy under Uniaxial Tension and Biaxial Gas Bulging Conditions. Materials Science & Engineering A, 708, 149-158.
• Gao, H., El Fakir, O., Wang, L., Politis, D.J., Li, Z. (2017) Forming limit prediction for hot stamping processes featuring non-isothermal and complex loading conditions. International Journal of Mechanical Sciences, 131-132, 792-810.
• Politis, N.J., Politis, D.J. (2017) Development of a Computational Optimisation System to Determine Constitutive Equation Constants for Metal Alloys. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 0(0), 1-18.
• Zheng, K., Politis, D. J., Lin, J., Dean, T. A. (2017) An experimental and numerical investigation of the effect of a macro-textured tool surface in hot stamping, International Journal of Material Forming, 10(2), 241-254.
• Zheng, K., Lee, J., Politis, D. J., Li, N., Lin, J. and Dean, T. A. (2017) An analytical buckling model on the flange wrinkling behaviour of aluminium alloy sheet stamping processes with macro-textured tool surfaces. International Journal of Advanced Manufacturing Technology, 1-15.
• Hu, Y., Wang, L., Politis, D.J., Masen, M. (2017) Development of an interactive friction model for the prediction of lubricant breakdown behaviour during sliding wear. Tribology International, 110, 370-377.
• Zhou, D., Yuan, X., Gao, H., Wang, A., Liu, J., El Fakir, O., Politis, D. J., Wang, L., Lin, J. (2016) Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes. Journal of Visualized Experiments. http://www.jove.com/video/53957/knowledge-based-cloud-fe-simulation-of-sheet-metal-forming-processes?status=a55963k
• Politis, D. J., Politis, N. J., Lin, J., Dean, T. A. and Balint, D. S. (2016) An analysis of the tooth stress distribution of forged bi-metallic gears. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 0(0), 1-16.
• Sun, C., Xiang, Y., Zuo, Q., Politis, D. J., Sun, Z., Wang, M. (2016) Dynamic recrystallization and hot workability of 316LN stainless steel. Metals, 6 (7), 152.
• Zheng, K., Politis, D. J., Lin, J., Dean, T. A. (2016) A study on the buckling behaviour of aluminium alloy sheet in deep drawing with macro-textured blankholder. International Journal of Mechanical Sciences, 110, 138-150.
• Sun, C., Wang, B., Politis, D.J., Wang, L., Cai, Y., Guo, X., Guo, N. (2016) Prediction of earing in TWIP steel sheets based on coupled twinning crystal plasticity model. The International Journal of Advanced Manufacturing Technology, 1-11.
• Politis, D. J., Lin, J., Dean, T. A. and Balint, D. S. (2014). An investigation into the forging of bi-metal gears. Journal of Materials Processing Technology, 214, 2248-2260.

Peer Reviewed Conference Proceedings

• Loh-Mousavi, M., AhmdaiRad, M., Maeno, T., Politis, D.J., Wang, L. (2018) Coupled thermal-electrical finite element analysis of electrical resistance heating in hot stamping of ultra-high strength steel tubes. 17th International Conference on Metal Forming, Metal Forming 2018, Toyohashi, Japan.
• Zhang, Q., Luan, X., Politis, D.J., Cai, Z., Wang, L. (2017) Modelling of quenching sensitivity of high strength AA6082 aluminium alloy during a novel forming process (FAST). 37th International Deep-Drawing Research Group IDDRG 2018, Waterloo, Canada
• Gao, H., Gharbi, M., Politis, D.J., Xi, L., Ji, K., Wang, L. (2017) Optimization of blank shape using forming limit prediction model on AA7075 under hot stamping conditions. 12th International Conference on the Technology of Plasticity ICTP 2017, Cambridge, United Kingdom.
• Gharbi, M., Liang, V., Zheng, Y., Hu, Y., Politis, D. J., Wang, L. (2017) The anti-galling behavior of advanced coating contacts with aluminium alloy during sliding wear. 12th International Conference on the Technology of Plasticity ICTP 2017, Cambridge, United Kingdom.
• Gao, H., Politis, D.J., Luan, X., Zhang, Q., Zheng, Y., Wang, L. (2017) Initial blank shape optimisation for the hot stamping process. 36th IDDRG Conference Materials Modelling and Testing for Sheet Metal Forming, Munich Germany, 2^nd-6^th July Session 900, 1-6.
• Li, N., Politis, D.J., Lin, J., Dean, T.A. (2017) Enabling Lighter Vehicle Structures, Invited Speech 5. International Symposium on Green Manufacturing and Applications 27^th June-1^st July ISGMA 2017, Gyeongju, Korea.
• Zheng, K., Zhu, L., Politis, D. J., Lin, J., Dean, T. A. (2016) An analytical and numerical investigation on flange wrinkling behavior in warm forming process of AA5754 using macro-textured tool design. Key Engineering Materials, 716, 586-594.
• Politis, N. J., Politis, D. J., Davies, C. M., Lin, J. (2016) A method of determining unified viscoplastic constitutive equations for hot forging simulations. Key Engineering Materials, 716, 251-261.
• Zheng, Y., Hu, Y., Gharbi, M.M., Politis, D.J., Wang, L. (2016) Development of coating design guidelines for a sheet metal forming tool - a feasibility study. The 10th International Tooling Conference, Tool.
• Hu, Y., Zheng, Y., Politis, D.J., Wang, L., Gharbi, M.M (2016) Investigation of galling behaviours between an aluminium alloys and metal forming tool. Advanced High Strength Steel and Press Hardening, World Scientific, 438-442. The 3rd International Conference on Advanced High Strength Steel and Press Hardening, ICHSU 2016.
• Chan, T.Y., Hu, Y., Gharbi, M.M., Politis, D.J., Wang, L. (2016) The friction coefficient evolution of a MoS2/WC multi-layer coating system during sliding wear. Journal of Physics: Conference Series, 734(3), 032081
• Shao, Z., Li, N., Politis, D. J., Bai, Q., Lin, J. (2016) Analysis on Experimental Techniques for Generating FLD at Elevated Temperatures. Advanced High Strength Steel and Press Hardening: Proceedings of the 2nd International Conference ICHSU, 141-148.
• Politis, D. J., Foster, A. D., Li, N., Wang, L., Lin, J., Szegda, D. (2016) Prediction of thinning behavior for complex-shaped, lightweight alloy panels formed through a hot stamping process. Advanced High Strength Steel and Press Hardening: Proceedings of the 2nd International Conference ICHSU, 395-401.
• Yuan, Xi., Zhou, D., Politis, D. J., Ma, G., Wang, L. (2015) Tool Life Prediction under Multi-cycle Loading Conditions: a feasibility study. MATEC Web of Conferences, 21, 12007, 1-7. Awarded Best Paper Prize on Modelling of Forming Processes.
• Zheng, K., Lin, J., Politis, D. J., Dean, T. A. (2015) An experimental investigation for macro-textured tool in hot stamping. MATEC Web of Conferences, 21, 05005, 1-7.
• Politis, N. J., Politis, D. J., Davies, C. M., Lin, J., Dean, T. A. (2014) An experimental and numerical investigation into forming force reduction in precision gear forging. Key Engineering Materials, 622, 165-173.
• Politis, D. J., Lin, J. and Dean, T. A. (2012) Investigation of material flow in forging bi-metal components. Steel Research International: Special Edition, 14, 231-234.