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Mechanisms of energy absorption in hybrid material systems consisting of sheet metal and advanced composites under bending load

: Soot, Thomas; Dlugosch, Michael; Fritsch, Jens; Lukaszewicz, Dirk


Waas, A. ; American Society for Composites -ASC-:
American Society for Composites - Thirty-Third Technical Conference on Composite Materials 2018. Proceedings : September 24-26, 2018, Seattle, Washington
Lancaster, Pa.: DEStech Publications, 2018
ISBN: 978-1-60595-534-6 (Originalausgabe)
ISBN: 978-1-5108-7207-3 (Curran)
American Society for Composites (ASC Technical Conference) <33, 2018, Seattle/Wash.>
Fraunhofer EMI ()

In previous experimental investigations [1], the positive characteristics of hybrid fiber reinforced polymer (FRP)-steel material systems in terms of energy absorption were analyzed in 3-point-bending tests on coupon scale. Depending on the specimen orientation and thus on the differing tensile or compressive loading of the respective components, a differing energy absorption was observed. For predominant compressive loading of the FRP phase, some material systems have shown a higher energy absorption compared to the reversed specimen orientation. To understand the observed effect and the relevant damage mechanisms, a particular test method consisting of the combination of stepwise mechanical testing, digital image correlation (DIC) as well as intermediate microscopic and computer tomographic (CT) analysis is developed in this study. The results of the DIC allows for the detection of the neutral strain plane and its shift during the progressing deflection and damage. Based on the data obtained, an estimation of the respective effects of the detected damage mechanisms on the change in the components loading situation is possible. These results are discussed with respect to the phenomenological failure models given by Puck and Schürmann (see [2–4]) and provide a basis for further study.