Unidirectional glass fiber reinforced plastic (U-GFRP) represents itself as an excellent lightweight structural material due to its high tensile strength Rm and its low density ρ. A major drawback, however, is the relative weakness of the matrix under more complex, multi-axial loading conditions. Therefore, a local hybridization of U-GFRP seems to be an adequate measure to enhance the robustness of the material. The here considered material is made up by a high strength steel and U-GFRP targeting for an implementation into a cyclically loaded component. It is suited for the design of the entire component as well as for the strengthening of a force transmission point by its local hybridization.
The material testing program sets the focus on the investigation of the strength of the interface between U-GFRP and the additional constituent steel. Hence, the energy release rate, the static shear strength as well as the cyclic shear strength of the considered interface have been determined at room temperature RT and at an elevated temperature of T = 80° Additionally, aged specimens have been statically tested as well. The results show up that primers, such as silane, are leading to a good adhesion between the constituents. The project pays special attention to the characterization of the residual stresses that occurs during manufacturing. Its determination happens by means of comprehensive XRD measurements. The experimental gained results correspond very well with the results of an analytical model. Finally, the so developed intrinsic hybrid laminate is applied to the design of a force transmission point of a cyclically loaded component as a demonstrator.