Part made from composite material, comprising a reinforcement against delamination, and production method thereof

A composite material workpiece comprising:

• a soleplate;
• a T-shaped reinforcement comprising a first L-shaped member and a second L-shaped member arranged back-to-back to form a T, wherein the first L-shaped member includes a first base and the second L-shaped member includes a second base, the first and second bases each extending on the soleplate, wherein the first L-shaped member includes a first rib and the second L-shaped member includes a second rib, the first and second ribs attached back-to-back to form a web, wherein the first L-shaped member includes a first connecting portion and the second L-shaped member includes a second connecting portion that connects said ribs on said first and second bases;
• a plurality of needles connecting the soleplate on the T-shaped reinforcement in a vicinity of said first and second connecting portions, and extending in several directions through the soleplate and the T-shaped reinforcement;
• and
• a core housed in a cavity delimited by a junction area between the soleplate, the first connecting portion, and the second connecting portion, wherein
• the plurality of needles pass through said core,
• at least one portion of the plurality of needles extends radially along a radius of curvature of the first connecting portion and the second connecting portion,
• at least another portion of the plurality of needles extends in a direction of the first and second ribs, and
• the plurality of needles extend in a star configuration by intersecting at a center of the core and said workpiece.