Curved stiffener for a turbine engine nacelle and method for producing such a stiffener

A curved stiffener for a turbomachine cowl composed of a resin-impregnated fibrous reinforcement,

• the stiffener comprising a ring portion shaped head, two ring portion shaped feet concentric with the head and having a radius greater than a radius of the head, and two inclined portions, each connecting one of the feet to a lateral side of the head,
• the fibrous reinforcement extending along a length direction, a width direction and a thickness direction,
• the dimension of the fibrous reinforcement along the length direction being greater than the dimension of the fibrous reinforcement along the width direction, and the dimension of the fibrous reinforcement along the thickness direction being the smallest of the dimensions of the fibrous reinforcement,
• the fibrous reinforcement having a central portion configured to form the head,
• two end portions disposed on either side of the central portion and configured to form the feet,
• two connecting portions connecting the central portion to the end portions and configured to form the inclined portions,
• the fibrous reinforcement comprising a stack of a plurality of layers of fibers stacked along the thickness direction and extending on the entire width of the fibrous reinforcement,
• each layer of fibers having a plurality of fibers parallel to each other extending along a direction inclined relative to the length direction,
• the fibers of two consecutive layers of fibers along the thickness direction have directions inclined relative to each other, and
• the layers of fibers are sewn together by sewing threads extending along the length direction,
• wherein the fibrous reinforcement comprises a layer of reinforcing fibers sewn with the layers of fibers by the sewing threads having a plurality of fibers parallel to each other extending along the length direction, the layer of reinforcing fibers extending at least on the central part, over a width smaller than the width of the fibrous reinforcement.