Impact-absorbing material and method for producing impact-absorbing material

A method for manufacturing an impact absorber that absorbs impact energy when receiving an impact load, the method comprising:

• manufacturing a fiber precursor that becomes a precursor of a fibrous structure, wherein the fiber precursor includes a tube precursor and a rib precursor that connects opposing inner surfaces of the tube precursor to each other;
• and
• impregnating the fiber precursor with a resin material serving as a matrix resin prior to hardening and hardening the resin material, wherein
• the tube precursor includes a fiber layer including
• load direction yarns, which are formed from reinforcement fibers, extending along a center axis of the tube precursor, and
• intersecting direction yarns, which are formed from reinforcement fibers, intersecting the load direction yarns,
• the rib precursor includes a fiber layer that at least includes
• first rib yarns, which are formed from reinforcement fibers, connecting the opposing inner surfaces of the tube precursor to each other, and
• second rib yarns that form a textile weave with the first rib yarns,
• the second rib yarns are formed from low-melting resin fibers, and
• when impregnating the fiber precursor with the resin material and hardening the resin material, the second rib yarns melt and mix with the matrix resin in a compatible manner.