Method for manufacturing a turbine engine blade root of a composite material and blade root obtained by such a method

A method of fabricating a turbine engine blade root out of composite material comprising fiber reinforcement densified by a matrix, the method comprising:

• making a central fiber strip and two outer fiber strips from three sets of yarn layers interlinked by three-dimensional weaving, the fiber strips extending in a common direction corresponding to a longitudinal direction of the blade root to be fabricated and the yarns of the three yarn layer sets not being interlinked between the various fiber strips;
• passing the two outer fiber strips through the central fiber strip with the two outer fiber strips crossing each other inside the central fiber strip;
• eliminating portions of the two outer fiber strips lying outside the central fiber strip by cutting them off in order to form a blade root fiber blank;
• shaping the blade root fiber blank in order to obtain a fiber preform having a main portion forming a blade-root preform integral with two secondary portions forming bearing-plate preforms;
• and
• densifying the fiber preform with a matrix in order to obtain a blade-root made of composite material having fiber reinforcement constituted by the preform and densified by the matrix.