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Investigation of failure mechanisms in hybrid fiber-reinforced plastics by means of in-situ-CT

: Bittner, F.; Endres, H.-J.

Hausmann, J.M. ; Deutsche Gesellschaft für Materialkunde -DGM-:
3. Internationale Konferenz Hybrid Materials and Structures 2018. Proceedings : 18. - 19. April 2018, Bremen
Frankfurt: DGM, 2018
ISBN: 978-3-88355-417-4
"Hybrid Materials and Structure" Conference (Hybrid) <3, 2018, Bremen>
Conference Paper
Fraunhofer WKI ()
hybrid fiber-reinforced plastic; failure mechanism; in-situ-CT

The failure mechanisms of fiber-reinforced plastics can be studied in detail with a novel In-situ-CT 4-point bending test, based on the testing standard ISO 14125. The 4-point bending test creates a complex load condition under simultaneous influence of tensile and compressive forces. By non-destructive CT measurement at different load levels the origin and development of defects can be traced. Initial tests performed on a natural and a hybrid fiber reinforced plastic reveal significant differences in defect initiation and development. Ruptures of the yarn on the tensile-loaded side characterize the failure process of the natural fiber-reinforced plastic. In the hybrid fiber-reinforced plastic carbon fibers initially show damage on the compression-loaded side followed by fiber breaks on the tensile-loaded side. Matrix failure as well as pores as potentially weak points apparently have no influence in this example. Relevant relaxation effects could be excluded on the investigated macroscopic scale.