Influence of polymer matrix on the induction heating behavior of CFRPC laminates
Stephan Becker, Marc Michel, Peter Mitschang, Miro Duhovic
Abstract
Within this study, the influence on the induction heating rate of different matrix polymer systems in combination with different reinforcing fabrics made of carbon fibers (CF) was experimentally investigated for a frequency of 480 kHz. Additionally, an electrical model representing CF-CF junctions in non-crimped fabrics, as well as roving-roving junctions in woven fabrics, was developed. The dielectric properties of the polymer matrix have no significant influence on the induction heating behavior of CFRPC compared to other laminate parameters. Compared to the heat dissipated due to the contact resistance m, the heat dissipated at one cross-junction due to dielectric losses is up to twelve decades lower. The dominant heating mechanism for induction heating of CFRPC laminates crucially depends on the magnitude of contact resistivity at the cross-junction. Below a contact resistivity of 10−5 Ω*m2 the losses due to Joule heating and beyond 10−5 Ω*m2 the losses due to contact resistances dominate.