FIELD: weaving.
SUBSTANCE: invention relates to a fibrous structure comprising a preform portion formed as a single piece by three-dimensional weaving between a first plurality of layers of threads and a second plurality of layers of threads, wherein the preform portion corresponds to all or part of a fibrous reinforcement preform for a composite material part.
EFFECT: outside of the preform portion, the fibrous structure comprises one or more layers of two-dimensional fabric, wherein each layer of two-dimensional fabric groups the threads of the same layer belonging at least to the first plurality of layers of threads outside the preform portion.
16 cl, 9 dwg
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