CPC F01D 5/147 (2013.01) [F01D 5/141 (2013.01); F01D 5/282 (2013.01); F05D 2240/303 (2013.01); F05D 2300/6034 (2013.01)] | 17 Claims |
1. A turbomachine fan blade comprising a structure made of composite material comprising a fibrous reinforcement obtained by three-dimensional weaving of strands and a matrix wherein is embedded the fibrous reinforcement, the fibrous reinforcement comprising a first portion and a second portion distinct from one another, the strands of the fibrous reinforcement comprising first strands made of a first material having a first stiffness and second strands made of a second material different from the first material and having a second stiffness smaller than the first stiffness, the first portion comprising only first strands, the second portion comprising only second strands,
wherein the fibrous reinforcement also comprises a third portion positioned between the first portion and the second portion, the third portion comprising first strands, second strands and third strands at the same time, the third strands having a third stiffness smaller than the first stiffness and greater than the second stiffness, and wherein, within the third portion, a volume density of the first strands decreases progressively from the first portion in the direction of the second portion, a volume density of the second strands decreases progressively from the second portion in the direction of the first portion.
|