3D WOVEN FIBROUS STRUCTURE, FIBROUS PREFORM OBTAINED FROM SUCH A FIBROUSSTRUCTURE AND PART IN A COMPOSITE MATERIAL INCLUDING SUCH A PREFORM.

摘要

A fibrous preform (20) is formed by a three-dimensional woven fibrous structure with a plurality of warp yarn layers bonded together by weft yarns of a plurality of weft yarn layers, the fibrous preform having a first portion (12) and a second portion (14) located in the extension of one another in the weft direction and forming an angle between them. In the fold zone and in each weft plane of the fibrous structure, two weft threads located in a region adjacent to an outer face of the fibrous structure located on the inner side of the angle have intersecting paths, so that that a smaller curvature is imposed on these threads.