Structural member for automobile body
Disclosed is a structural member for an automobile body includes: a hat channel member that has a top sheet portion, a pair of side wall portions extending via first corner portions, and a pair of flange portions extending via second corner portions; and a joining member that has a pair of joining portions and a top sheet facing portion, wherein a first bead extending in the longitudinal direction is formed on the top sheet portion, and wherein two or more second beads extending in a direction intersecting the longitudinal direction are formed on the pair of side wall portions.
1. A structural member for an automobile body, comprising:
a hat channel member that has
a top sheet portion extending in a longitudinal direction,
a pair of side wall portions extending via first corner portions formed at both end portions of the top sheet portion in a width direction, and
a pair of flange portions extending via second corner portions formed at end portions of the pair of side wall portions on sides opposite to the first corner portions; and
a joining member that has
a pair of joining portions joined to the pair of flange portions of the hat channel member, and
a top sheet facing portion facing the top sheet portion of the hat channel member,
wherein a first bead extending in the longitudinal direction is formed on the top sheet portion,
wherein two or more second beads extending in a direction intersecting the longitudinal direction are formed on the pair of side wall portions, and
wherein two or more of the first beads are formed in parallel in the width direction.
2. The structural member for an automobile body according to claim 1 , wherein the first bead is formed such that a center of the first bead in the width direction is positioned in a region from a boundary point between the top sheet portion and the first corner portion to a point having a separation distance of ¼ of a width of the top sheet portion in the width direction in a cross section perpendicular to the longitudinal direction.
3. The structural member for an automobile body according to claim 1 , wherein the first bead is formed such that a boundary point between the first bead and the top sheet portion is positioned in a region from a boundary point between the top sheet portion and the first corner portion to a point having a separation distance of 20 mm in a cross section perpendicular to the longitudinal direction.
4. The structural member for an automobile body according to claim 1 , wherein the second bead extends from the first corner portion.
5. The structural member for an automobile body according to claim 4 , wherein the second bead extends to the second corner portion.
6. The structural member for an automobile body according to claim 1 ,
wherein a width of the first bead is 5 mm to 20 mm, and
wherein a depth of the first bead is 5 mm to 20 mm.
7. The structural member for an automobile body according to claim 1 , wherein an aspect ratio calculated as a depth/a width of the first bead is 0.25 to 4.0.
8. The structural member for an automobile body according to claim 1 ,
wherein a width of the second bead is 10 mm to 60 mm, and
wherein a depth of the second bead is 2 mm to 10 mm.
9. The structural member for an automobile body according to claim 1 , wherein an aspect ratio calculated as a depth/a width of the second bead is 0.05 to 1.0.
10. The structural member for an automobile body according to claim 1 , wherein the top sheet portion of the hat channel member is formed of a steel sheet having a sheet thickness of 1.2 mm or less.
11. The structural member for an automobile body according to claim 1 , wherein the top sheet portion of the hat channel member is formed of a steel sheet having a tensile strength of 980 MPa or more.
12. The structural member for an automobile body according to claim 1 , wherein the hat channel member is a quenched member.
13. The structural member for an automobile body according to claim 2 , wherein the second bead extends from the first corner portion.
14. The structural member for an automobile body according to claim 2 ,
wherein a width of the first bead is 5 mm to 20 mm, and
wherein a depth of the first bead is 5 mm to 20 mm.
15. The structural member for an automobile body according to claim 2 , wherein an aspect ratio calculated as a depth/a width of the first bead is 0.25 to 4.0.
16. The structural member for an automobile body according to claim 2 ,
wherein a width of the second bead is 10 mm to 60 mm, and
wherein a depth of the second bead is 2 mm to 10 mm.
17. The structural member for an automobile body according to claim 2 , wherein an aspect ratio calculated as a depth/a width of the second bead is 0.05 to 1.0.
18. The structural member for an automobile body according to claim 2 , wherein the top sheet portion of the hat channel member is formed of a steel sheet having a sheet thickness of 1.2 mm or less.
19. The structural member for an automobile body according to claim 2 , wherein the top sheet portion of the hat channel member is formed of a steel sheet having a tensile strength of 980 MPa or more.
20. The structural member for an automobile body according to claim 2 , wherein the hat channel member is a quenched member.