Composite structure, aircraft, and lightning current guiding method

A composite structure comprising:

• at least one composite member having a through hole;
• and
• at least one fastener that is inserted in the through hole and couples the composite member and another part to each other,
• the at least one composite member including an electrically-conductive composite member provided at least in part or all of a through-hole portion, the through-hole portion being a portion, of the at least one composite member, having the through hole,
• the electrically-conductive composite member having a thickness that is greater in a portion, of the electrically-conductive composite member, included in the through-hole portion than in a portion, of the electrically-conductive composite member, other than the through-hole portion, and
• the electrically conductive composite member including fiber reinforced plastics that comprising electrically-conductive resin reinforced by fibers, wherein
• the at least one composite member comprises a first composite member having a first through hole and a second composite member having a second through hole;
• a bracket is provided that couples the first composite member and the second composite member to each other;
• the at least one fastener comprised a first fastener that is inserted in the first through hole and couples the first composite member and the bracket to each other and a second fastener that is inserted in the second through hole and couples the second composite member and the bracket to each other,
• the first composite member and the second composite member include an electrically-conductive composite member provided at least in part or all of a first through-hole portion and a second through-hole portion, respectively, the first through-hole portion being a portion, of the first composite member, having the first through hole, the second through-hole portion being a portion, of the second composite member, having the second through hole,
• the electrically-conductive composite member has a thickness that is greater in a portion, of the electrically-conductive composite member, included in the first through-hole portion and the second through-hole portion than in a portion, of the electrically-conductive composite member, other than the first through-hole portion and the second through-hole portion.

A lightning current guiding method comprising:

• making at least part or all of a through-hole portion of a composite member with an electrically-conductive composite member, the composite member being included in a composite structure, the composite member having a through hole and being coupled to another part by a fastener, the fastener being inserted in the through hole of the composite member, the through-hole portion being a portion, of the composite member, having the through hole, the electrically-conductive composite member including fiber reinforced plastics that comprise electrically-conductive resin reinforced by fibers;
• causing the electrically-conductive composite member to have a thickness that is greater in a portion, of the electrically-conductive composite member, included in the through-hole portion than in a portion, of the electrically-conductive composite member, other than the through-hole portion;
• and
• guiding a lightning current to the electrically-conductive composite member,
• wherein the at least one composite member partially includes a non-electrically-conductive composite member, and
• wherein the at least one composite member includes a stack including the non-electrically-conductive composite member that has a uniform thickness and a plate shape and the electrically-conductive composite member that has a non-uniform thickness and a plate shape.