A fibrous preform designed to form a reinforcement for a part made of composite material.

Abstract

The invention relates to a fibrous preform (40) intended to form a reinforcement for a part (100), the preform being formed by several superimposed fibrous layers (20af; 20bf; 20cf; 20df) and comprising a first annular region (42) and a second flange region (43) extending from an axial edge (BA42) of the first region. The preform comprises a first layer A (20af) of unidirectional fibers, oriented at an angle (α1) between -10° and +10° with respect to a circumferential direction (DC), which is formed by continuous fibers (24a) in the first region and by discontinuous fibers (25a) distributed in several rows (R1f … Rnf) in each second region. The circumferential spacing (e1; en) between adjacent discontinuous fibers in the same row increases as one moves away from the axial edge of the first region. Fig. 7.