Investigation of the influence of exposure time on the dual-curing reaction of RPU 70 during the DLS process and the resulting mechanical part properties

Obst P, Riedelbauch J, Oehlmann P, Rietzel D, Launhardt M, Schmölzer S, Osswald TA, Witt G (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Additive Manufacturing Elsevier

Book Volume: 32

Article Number: 101002

DOI: 10.1016/j.addma.2019.101002

Abstract

Photo-differential scanning calorimetry (Photo-DSC), standard DSC and tensile testing are used in order to investigate the influence of different exposure times on the dual-curing reaction and mechanical properties of RPU 70 specimens produced by the additive manufacturing technology Digital Light Synthesis (DLS). A comparison of reaction enthalpies measured with a Photo-DSC of different exposure times followed by thermal curing and DSC experiments with different exposed DLS green products shows that the degree of thermal cross-linking of the two-component resin RPU 70 is determined by the preceding cross-linking reaction during photo-polymerization. A shorter exposure time of UV-light enhances the subsequent thermal cross-linking, while increased exposure reduces the effect of thermal curing in the second process step. Tensile testing results of specimen produced with custom-made print profiles on the DLS Carbon M2 with different exposure times show that mechanical characteristics such as tensile strength and elongation at break are strongly dependent on the degree of UV-cross-linking. The mechanical characteristics of DLS parts produced with the RPU 70 resin system can therefore be adapted to specific requirements and applications using these customized print profiles with different exposure times.

Authors with CRIS profile

Martin Launhardt Lehrstuhl für Kunststofftechnik (LKT)

Involved external institutions

BMW AG - Bayerische Motoren Werke / BMW Group DE Germany (DE) Erich NETZSCH GmbH & Co. Holding KG DE Germany (DE) University of Wisconsin - Madison US United States (USA) (US) Universität Duisburg-Essen (UDE) DE Germany (DE)

How to cite

APA:

Obst, P., Riedelbauch, J., Oehlmann, P., Rietzel, D., Launhardt, M., Schmölzer, S.,... Witt, G. (2020). Investigation of the influence of exposure time on the dual-curing reaction of RPU 70 during the DLS process and the resulting mechanical part properties. Additive Manufacturing, 32. https://dx.doi.org/10.1016/j.addma.2019.101002

MLA:

Obst, Philip, et al. "Investigation of the influence of exposure time on the dual-curing reaction of RPU 70 during the DLS process and the resulting mechanical part properties." Additive Manufacturing 32 (2020).

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