Numerical study of the scratch-closing behavior of coatings containing an expansive layer

► We model a scratch-closing coating based in an expansive layer. ► We have gained insight in the mechanical behavior beyond test based results. ► Stiffness ratio expansive and protective layers: maximum scratch closing capacity. ► The layer bulk modulus ratio and the layer thicknesses ratio also drive this capacity. ► The delamination length between the expansive layer and the substrate: key factor.