Hollow member
Energy absorption at the time of load input is improved with high mass efficiency. A hollow member includes: a hollow metal member having a bending induction portion in a portion thereof in a longitudinal direction; and a resin material which is disposed in close contact with the metal member on both sides of the bending induction portion in the longitudinal direction, and is disposed in at least a part of a range of less than ⅚ of a cross-sectional height of the metal member from an end portion of the bending induction portion toward an outside in the longitudinal, in which an amount of the resin material per length in the longitudinal direction is larger on the outside of the bending induction portion than on an inside of the bending induction portion.
1. A hollow member comprising:
a hollow metal member having a bending induction portion in a portion thereof in a longitudinal direction, wherein the hollow metal member comprises a first metal sheet; and
a resin material disposed in close contact with the metal member on both sides of the bending induction portion in the longitudinal direction, and disposed in at least a part of a range of less than ⅚ of a cross-sectional height of the metal member in the longitudinal direction from an end portion of the bending induction portion to an outside of the end portion of the bending induction portion,
an amount of the resin material per length in the longitudinal direction being larger on an outside of the bending induction portion than on an inside of the bending induction portion,
wherein, in a cross section transverse to the longitudinal direction of the metal member, the resin material is disposed only on a side where a bend inside is present with respect to a boundary that halves the cross section in a height direction of the cross section defined by a direction from a center of mass of the cross section toward the bend inside induced by the bending induction portion,
wherein the bending induction portion is a portion in which a radius of curvature of a locus of a center of mass along the longitudinal direction formed by the center of mass of a cross section of the metal member is 260 mm or less.
2. The hollow member according to claim 1 ,
wherein the first metal sheet forming the metal member has a hole,
the resin material is made of a foamed resin, and
the resin material passes through the hole and is disposed in close contact with both an outer surface and an inner surface of the first metal sheet.
3. The hollow member according to claim 2 ,
wherein a hole edge end of the hole is located inward of the metal member from the first metal sheet forming the metal member.
4. The hollow member according to claim 3 ,
wherein the hole is a burring hole in which the hole edge end of the hole protrudes from an outside to an inside of the first metal sheet forming the metal member.
5. The hollow member according to claim 2 ,
wherein the hole is provided with a recess portion recessed inward of the metal member from the first metal sheet forming the metal member, and
the hole is provided in an inner portion of the recess portion.