Effect of Binder Activation on in-Plane Capillary Flow in Multilayer Stacks of Carbon Fiber Fabrics
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In: Applied composite materials, Vol. 31.2024, No. April, 21.12.2023, p. 709-719.
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TY - JOUR
T1 - Effect of Binder Activation on in-Plane Capillary Flow in Multilayer Stacks of Carbon Fiber Fabrics
AU - Neunkirchen, Stefan
AU - Bender, Marcel
AU - Schledjewski, Ralf
N1 - Publisher Copyright: © 2023, The Author(s).
PY - 2023/12/21
Y1 - 2023/12/21
N2 - Binder/tackifier materials are commonly used in preforming processes to preserve the structural integrity of the preform during processing. In the following resin infusion or injection process, this additional material will influence the resin flow. While the influence on fabric permeability is thoroughly examined in scientific literature, only few studies investigate the capillary behavior. By thermal activation of the binder, the material melts and spreads across the layer’s surface or is imbibed by the rovings.In this study, capillary rise experiments in planar direction with four different carbon fiber fabrics were performed. The tested stacks were activated at different temperature levels and compressed in a vacuum bag, one of them with additional external pressure in an autoclave. In case of no external pressure, the processing and testing conditions showed a larger influence than binder activation temperature, while autoclave-conditioned specimens showed a decreased capillary rise velocity for all levels of activation temperature. Digital microscopy images of the specimens show that molten binder can create a thin film between the layers, which prevents peripheral flow and thus forces the fluid to rise in the (angulated) capillary tubes inside the rovings.
AB - Binder/tackifier materials are commonly used in preforming processes to preserve the structural integrity of the preform during processing. In the following resin infusion or injection process, this additional material will influence the resin flow. While the influence on fabric permeability is thoroughly examined in scientific literature, only few studies investigate the capillary behavior. By thermal activation of the binder, the material melts and spreads across the layer’s surface or is imbibed by the rovings.In this study, capillary rise experiments in planar direction with four different carbon fiber fabrics were performed. The tested stacks were activated at different temperature levels and compressed in a vacuum bag, one of them with additional external pressure in an autoclave. In case of no external pressure, the processing and testing conditions showed a larger influence than binder activation temperature, while autoclave-conditioned specimens showed a decreased capillary rise velocity for all levels of activation temperature. Digital microscopy images of the specimens show that molten binder can create a thin film between the layers, which prevents peripheral flow and thus forces the fluid to rise in the (angulated) capillary tubes inside the rovings.
KW - Activation Temperature
KW - Binder
KW - Capillary rise
KW - Carbon Fabric
UR - https://pureadmin.unileoben.ac.at/portal/en/publications/effect-of-binder-activation-on-inplane-capillary-flow-in-multilayer-stacks-of-carbon-fiber-fabrics(7f2e84bd-a84a-45d6-a49e-311f1c8793a7).html
UR - http://www.scopus.com/inward/record.url?scp=85180195538&partnerID=8YFLogxK
U2 - 10.1007/s10443-023-10198-6
DO - 10.1007/s10443-023-10198-6
M3 - Article
VL - 31.2024
SP - 709
EP - 719
JO - Applied composite materials
JF - Applied composite materials
SN - 0929-189X
IS - April
ER -