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The exploitation of the toughness of steel in steel-polymer hybrids in structuralapplications is limited due to the huge difference in stiffness of thereinforcement (200 GPa for steel) compared to the polymer matrix (between 1 and3 GPa only). This stiffness mismatch leadsto stress concentrations at thesteel-polymer interface, which give rise to either early interface fracture orplastic yielding. The guiding hypothesis within this PhD research, whichfocuses on the optimization of polymer-steel hybrids, is that it is necessaryto decrease the polymer-steel stiffness mismatch and that the steel-polymeradhesion as well as the polymer toughness and/or yield stress in theinterphasial region need to be improved.

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