Method of fabricating a composite material part with improved intra-yarn densification

A method of fabricating a composite material part comprising fiber reinforcement densified by a matrix, said method comprising the following steps:

• making a fiber fabric by weaving yarns, said fiber fabric having a determined initial mean fiber percentage;
• and
• densifying the fiber fabric with a matrix;
• wherein said method further includes, prior to densifying the fiber fabric, a step of treating the fabric by subjecting said fabric to one or more jets of water under pressure so as to reduce the mean fiber percentage in the fabric to a value lying in the range 20% to 45%, and in that each water jet is delivered from a nozzle, the pressure of the water jet at the outlet from the nozzle being less than or equal to 100 bars, each nozzle being placed at a distance from the surface of the fiber fabric that is greater than or equal to 50 mm.