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Characterization and Simulation of the Interface between a Continuous and Discontinuous Carbon Fiber Reinforced Thermoplastic by Using the Climbing Drum Peel Test Considering Humidity.
Christ, Nicolas; Scheuring, Benedikt M; Schelleis, Christoph; Liebig, Wilfried V; Montesano, John; Weidenmann, Kay A; Hohe, Jörg.
Affiliation
  • Christ N; Institute for Applied Materials, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
  • Scheuring BM; Component Safety and Lightweight Construction, Fraunhofer Institute for Mechanics of Materials, 79108 Freiburg, Germany.
  • Schelleis C; Institute for Applied Materials, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
  • Liebig WV; Polymer Engineering, Fraunhofer Institute for Chemical Technology ICT, 76327 Pfinztal, Germany.
  • Montesano J; Lightweight Design, Institute of Vehicle Systems Technology, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
  • Weidenmann KA; Institute for Applied Materials, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
  • Hohe J; Department of Mechanical and Mechatronics Engineering, Univesity of Waterloo, Waterloo, ON N2L 3W8, Canada.
Polymers (Basel) ; 16(7)2024 Apr 03.
Article in En | MEDLINE | ID: mdl-38611234
ABSTRACT
The objective of this paper is to investigate the debonding behavior of the interface between continuously and discontinuously fiber reinforced thermoplastics using the climbing drum peel test. The study emphasizes on the importance of considering different climatic boundary conditions on the properties of thermoplastics. Specimens with varying moisture contents, from 0m.% up to above 6m.% are prepared and tested. It is observed that an increase in moisture content from 0m.% to 2m.% results in an increase of the fracture surface energy from 1.07·103J/m2 to 2.40·103J/m2 required to separate the two materials, but a further increase in moisture to 6.35m.% conversely results in a subsequent decrease of the required energy to 1.91·103J/m2. The study presents an explanatory model of increasing plasticization of the polymer due to increased polymer chain mobility, which results in more deformation energy being required to propagate the crack, which is corroborated in SEM investigations of the fracture surface. A further increase in humidity leads to polymer degradation due to hydrolysis, which explains the subsequent reduction of the fracture energy. The experimental set up is modeled numerically for the first time with cohesive surfaces, which could successfully reproduce the effective force-displacement curve in the experiment by varying the interface parameters in the model over an influence length, allowing the conclusion of a process induced variation in the interface properties over a specific consolidation length.
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Polymers (Basel) Year: 2024 Document type: Article Affiliation country:

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Polymers (Basel) Year: 2024 Document type: Article Affiliation country: