Characterizing friction for fiber reinforced composites manufacturing: Method development and effect of process parameters

In automated layup manufacturing processes of fiber-reinforced polymer composites, the quality manufactured part is strongly dependent on frictional behavior. Improper control forces can lead to defect formation. Frictional sliding rheometry tests provide an innovative methodology accurately characterize tool-ply friction unidirectional (UD) prepreg employing unique annular plate geometries. The effect processing parameters (temperature, velocity, and normal force) response a carbon fiber was studied. Moreover, utilizing custom designed geometries coupled with optically transparent fixtures allowed for in-situ quantification prepreg-rigid surface contact area along simultaneous characterization process parameter-dependent mechanisms. Our findings highlight reduction in increasing temperature, attributed increased resin flowability, while increases rates resulted pronounced increase forces. applied load characteristics more complicated due contributions from both adhesive Finally, results were interpreted light measurements performed at different temperatures, force, rate. • properties prepregs are characterized geometry rheometer. Effect variables investigated. Optical microscopy facilitates between rigid substrate. behavior transitions mixed hydrodynamic lubrication regime Stribeck curve. controlled by load, leading deviations Amontons' law.