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This article focuses on resonant ice protection systems and studies fracture mechanisms at work for flexural modes having frequencies lower than100 kHz. The objective is to study the power required for fracture initiation and propagation in this frequency range. Two types of deicing mechanisms are studied in this paper: tensile stress dominant flexural modes and shear stress dominant flexural modes. Criteria are introduced to enable the comparison between these deicing mechanisms according to their power requirements and the selection of the most promising configurations. Eventually, the numerical results are compared to experiments to verify assumptions and computations. The contribution of this article is to put forward power-efficient de-icing configurations for resonant electromechanical de-icing systems using flexural modes. Low frequency flexural modes appear to be less power consuming for both mechanisms. Tensile stress dominant flexural modes have lower power requirements than shear stress dominant modes. The instantaneous peak power requirement to cover 90% of the area is estimated to be 5.5 kW/m². Nomenclature A = Area (m²) b = Fracture width (m) Cshear = Criterion for fracture initiation by shear stress Ctensile = Criterion for fracture initiation by tensile stress Ccoh = Criterion for cohesive fracture unstable propagation

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