Graser Matthias
Dr. Matthias Graser
- Email: matthias.graser@fau.de
Profile
Projects
Improvement of formability of extruded aluminium profiles by a local short-term heat treatment
(Third Party Funds Single)Aim of the research project is the enhancement of the forming limit and the adjustment of the final mechanical properties of curved aluminum profiles by tailored heat treatment before the forming process. The influence of a short term heat treatment on aluminium profiles and the interaction with subsequent bending operation will be investigated fundamentally. This is a significant enhancement of the state of the art. Until now, in particular, fast hardenable aluminum blank alloys, which were especially developed for a short term heat treatment, were analyzed. The influence of a short term heat treatment on the mechanical properties of extruded aluminum profiles is not investigated yet. Regarding the influence on the microstructure there is only basic knowledge. On the one hand it is to be analyzed what microstructure and property changes can be induced due to the thermal treatment and how they can be controlled by a heat treatment process. Based on the basic understanding an appropriate property distribution should be determined in order to extend the forming limit, taking into account the complex stress and strain state in profile bending. Criteria for the improvement will be the contour accuracy achieved during the forming process or the reduction of the bending radius for the same cross-sectional deformation. The heat treatment will be designed using a thermo-mechanically coupled simulation which can determine the change of the mechanical properties derived by microstructural dissolution of precipitations. Finally, the question arises, how the interaction of a heat treatment and a bending operations affect the subsequent aging mechanisms and which final properties at the end of the process chain can be realized.
Publications
2023
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Numerical modelling of the process chain for aluminium Tailored Heat-Treated Profiles
In: Advanced Modeling and Simulation in Engineering Sciences 10 (2023), Article No.: 8
ISSN: 2213-7467
DOI: 10.1186/s40323-023-00247-x - :
Analysis of local short-term heat treat-ment methods to improve the forming behavior and the component properties of aluminum extruded hollow profiles (Dissertation, 2023)
DOI: 10.25593/978-3-96147-667-1
2020
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Influence of the properties of the joining partners on the load-bearing capacity of shear-clinched joints
In: Journal of Materials Processing Technology 283 (2020), Article No.: 116696
ISSN: 0924-0136
DOI: 10.1016/j.jmatprotec.2020.116696
2019
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On the inverse identification of Lankford coefficients using geometrical changes under quasi-biaxial loading
In: International Journal of Material Forming (2019)
ISSN: 1960-6206
DOI: 10.1007/s12289-019-01498-z - , , , :
Application of Tailor Heat Treated Blanks technology in a joining by forming process
In: Journal of Materials Processing Technology 264 (2019), p. 259-272
ISSN: 0924-0136
DOI: 10.1016/j.jmatprotec.2018.09.006 - , , :
Influence of the Material Combination on the Load-bearing Capacity of Shear-clinched Joints
1st International Conference on Advanced Joining Processes AJP 2019 (Ponta Delgada, São Miguel, 24. October 2019 - 25. October 2019)
2018
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Influence of a local laser heat treatment on the bending properties of aluminium extrusion profiles
In: Procedia CIRP 74 (2018), p. 780-784
ISSN: 2212-8271
DOI: 10.1016/j.procir.2018.08.011 - , , :
Numerical modelling approach for the temperature dependent forming behaviour of Ti-6Al-4V
In: Qin, Y.; Dean, T.A.; Lin, J.; Yuan, S. J.; Vollertsen, F. (ed.): Proceedings of the 5th International Conference on New Forming Technology, MATEC Web of Conferences 2018
DOI: 10.1051/matecconf/201819012004
2017
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Linked heat treatment and bending simulation of aluminium tailored heat treated profiles
4th World Congress on Integrated Computational Materials Engineering, ICME 2017 ( Ypsilanti, MI, USA, 21. May 2017 - 25. May 2017)
In: Paul Mason, Georg J. Schmitz, Amarendra K. Singh, Charles R. Fisher, Alejandro Strachan, Ryan Glamm, Michele V. Manuel (ed.): Minerals, Metals and Materials Series 2017
DOI: 10.1007/978-3-319-57864-4_22 - , , , , , , :
Precipitation behaviour and mechanical properties during short‑term heat treatment for tailor heat treated profiles (THTP) of aluminium alloy 6060 T4
15th International Conference on Aluminium Alloys, ICAA 2016 (Chongqing, 12. June 2016 - 16. June 2016)
In: Qing Liu, Robert Sanders, Zhihong Jia, Lingfei Cao, Jian-Feng Nie, Jian-Feng Nie (ed.): Materials Science Forum 2017
DOI: 10.4028/www.scientific.net/MSF.877.400 - , , , :
Aluminiumlösungen aus maßgeschneidert wärmebehandelten Halbzeugen
In: Konstruktion 06 (2017)
ISSN: 0720-5953 - , , , :
Verbesserung der Umformbarkeit von Aluminium
In: Konstruktion 69 (2017), p. IW14-IW16
ISSN: 0720-5953
2016
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Influence of short-term heat treatment on the microstructure and mechanical properties of EN AW 6060 T4 extrusion profiles - Part A
In: Production Engineering 10 (2016), p. 383–389
ISSN: 0944-6524 - , , , , , :
Influence of short-term heat treatment on the microstructure and mechanical properties of EN AW‑6060 T4 extrusion profiles – Part B
In: Production Engineering 10 (2016), p. 391–398
ISSN: 0944-6524 - , , , , :
Tailoring material properties in forming technology by a local heat treatment
In: Gronostajski, Z. (ed.): Advanced Metal Forming Processes in Automotive Industry 2016 - , , :
Improvement of the Formability of Aluminum Extrusion Profiles by a Tailored, Local Short-Term Heat Treatment
In: Dimitrov Dimiter, Oosthuizen Tiaan (ed.): Proceedings COMA16 2016
2015
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Experimental investigation of heat-treated aluminum profiles
In: Key Engineering Materials 651-653 (2015), p. 59-64
ISSN: 1013-9826
DOI: 10.4028/www.scientific.net/KEM.651-653.59 - , , :
Influence of a short-term heat treatment on the formability and ageing characteristics of aluminum profiles
Lasers in Manufacturing Conference
In: WLT e.V. (ed.): Lasers in Manufacturing Conference 2015
2014
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Efficient Aluminum - Qualifizierung des Einsatzes höchstfester Aluminiumlegierungen im Karosseriebau
1. Green Factory Bavaria Kolloquium 2014 - Engergieeffiziente Produktion
In: Franke, J.; Kreitlein, S.; Hoeft, A. (ed.): Tagungsband zum 1. Green Factory Bavaria Kolloquium 2014 - Engergieeffiziente Produktion 2014
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