Abstract
Based on a textile technology known from carpet manufacturing (tufting) respectively z reinforcement of fibre-reinforced plastics (FRPs), a new process has been developed for interface connections between two FRP component parts: tufting of pre-fabricated FRP pins during preform manufacturing. Both preform and
tufting loops are impregnated simultaneously. Afterwards so called "tufting pins" protrude out of plane of the FRP plate or into the inside of a 3D FRP hollow structure, for example a cylindrical component. The hollow structure can be filled with a core material in particular to enhance mechanical properties. In the case
of micro-gaps caused e. g. by shrinkage of the material the pins close these micro-gaps between core and FRP-hull or rather maintain mechanical contact between hull and core. In extensive tests the general adhesion properties between pinned FRP and concrete as a filling material as well as the influencing variables of
the tufting process with regard to their effects on mechanical parameters were investigated. Decisive influencing factors result both from the textile process as well as the component design. It is shown, how the tension load of a tufted FRP connection increases depending on the reinforcing fibre material as well as the
number of tufting pins.
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