For some application is it necessary to achieve a high qualitiy of the cutting surface. To what extend it will be possible to transfer the effects from shearing of sheet metal materials to shearing of fibre-reinforced plastics or hybrid laminats?
The best way of cutting FRP laminates is using carbide milling cutter which giving a shiny surface and high quality finishing, however this method has some drawback as it cause wasting material due to relatively big diameter of milting cutter.
Thank you very much for your answer. As far as I know, the use of carbide milling cutter is limitted by the laminate thickness, isn't it?
It depends on the type of fiber and the plastic that you use. The often used Glasfiber reinforced epoxy and carbonfiber reinforced epoxy do not Show any ductile shearing mode in the strict sense of shearing as the plastic epoxy reacts bittle and both fiber types even more. However often not all epoxy bonds are broken during chip Formation and some somewhat "classically shaped" chips will be produced. All to often you just generate extremely fine dust-like Chips. This can be very different for thermoset matricies and for organic fibers or tough fibers like aramid fibers. There is not General answer possible that will describe all cases.
By the way, smooth surfaces are no guarantee for a high Quality surface integer, i.e. flawless fibers or good resin properties. We observed in Drilling of cfrp that sometimes the best , meaning smoothest surfaces occur when the fiber tips broke off and were smeared with the resin particles onto the surface forming a thin layer with low Quality and different fiber orientation than the local Substrate struture had. These layers only looked good if you do not look closely. They will not stay on the surface under dynamic load for a Long time.
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