Differentiated shortening of strands of the fibrous reinforcement of a fan blade

A fan blade of a turbomachine comprising a structure made of composite material comprising a root configured to be inserted into a cavity of a fan disk, a vane configured to extend in an air flow and a stilt extending between the root and the vane;

• wherein the structure has a pressure face, a suction face and a total thickness at the stilt, the total thickness being measured between the pressure face and the suction face in the stilt part in a plane normal to a stacking axis of the fan blade;
• wherein the structure is obtained by three-dimensional weaving of weft strands and warp strands;
• wherein the composite material-structure has, within at least one of the root and the stilt, a first layer comprising the pressure face and having a first thickness of between 10% and 25% of the total thickness, a second layer comprising the suction face and having a second thickness of between 10% and 25% of the total thickness, and a central layer extending between the first layer and the second layer, and in that a shortening of the warp strands in the first and second layers being greater than a shortening of the warp strands in the central layer.