Abstract: A crashworthiness energy absorption part includes: a tubular member having tensile strength of 590 to 1180 MPa grade; a closed cross section space forming wall part having tensile strength lower than the tubular member and having both edge portions joined to inner surfaces of a pair of side wall portions of the tubular member, and forming a closed cross section space between the closed cross section space forming wall part and a part of a peripheral wall portion of the tubular member; and a resin configured to fill the closed cross section space, includes a rubber-modified epoxy resin and a curing agent, and has tensile breaking elongation of 80% or more, adhesive strength to the tubular member and closed cross section space forming wall part of 12 MPa or higher, and a compression nominal stress of 6 MPa or higher at a compression nominal strain of 10%.

Abstract: An automotive frame part is provided to a side portion of an automotive body and absorbs crashworthiness energy by bending upon receiving a crashworthiness load from a side of the automotive body. The automotive frame part includes: a member having a hat-shaped cross section or a U-shaped cross section and including a top portion, and a pair of side wall portions that are continuous from the top portion via punch shoulder R portions; and resin that is coated on or patched to an internal surface of the member having the hat-shaped cross section member or the U-shaped cross section. The resin extends at least to a predetermined range toward the top portion and the side wall portions on both sides of the punch shoulder R portions, and is adhered, after heating, to the internal surface at an adhesive strength of 10 MPa or higher at a room temperature.

Abstract: A side crash test apparatus uses a crash test structure including a center pillar, a roof-rail simulated part, and a rocker simulated part, and includes: a striker; a roof rail support; and a rocker support. The rocker support includes a rocker-rotation braking mechanism configured to restrain translation of the rocker simulated part, and support the rocker simulated part to be rotatable about an axis thereof and allow braking of the rotation. The rocker-rotation braking mechanism includes a rocker-rotation support member configured to rotate about the axis together with the rocker simulated part, a rocker-rotation shaft support configured to support a rotation center of the rocker-rotation support member, a rocker-rotation braking plate extended by rotation of the rocker-rotation support member while braking the rotation when the striker crashes into the center pillar, and a rocker rotation braking plate fixed portion configured to fix another end side of the rocker-rotation braking plate.

Abstract: A crash energy absorption part for an automobile is provided in a front portion or a rear portion of an automotive body and absorbing crash energy when a crash load is input from a front or a rear of the automotive body, and includes: a top portion; a tubular member including a side wall portion continuous with the top portion via a shoulder part of a punch; and a resin applied or patched to at least an inner surface of the shoulder part of a punch of the tubular member. The resin has a thickness gradually changing in an axial direction from one end side toward other end side, a thickest portion of the thickness is 8 mm or less, and the resin is bonded to the inner surface with an adhesive strength of 10 MPa or more and is axially crushed when the crash load is input.

Abstract: A method includes: manufacturing an automotive crashworthiness energy absorbing part; and assembling an automotive body by attaching the manufactured automotive crashworthiness energy absorbing part to the automotive body, wherein the manufacturing the automotive crashworthiness energy absorbing part includes: manufacturing a pre-coated part including a tubular member formed using a hat-shaped section member including a top portion and a side wall portion, and a coating part having quality of material with a strength lower than that of the tubular member, the coating part being disposed with a gap of 0.2 mm to 3 mm on an outer surface of a portion including a corner connecting the top portion and the side wall portion in the tubular member to form a coating film; and forming a coating film by forming a coating layer by electrodeposition coating in at least the gap in the pre-coated part, and thermally curing the coating layer.

Abstract: An automotive crashworthiness energy absorption part includes a tubular member formed by using a hat-shaped section part including a top portion and a side-wall portion; a coating part made of a material having a lower strength than the tubular member, the coating part being arranged on outer surfaces of the top portion and the side-wall portion at a portion including a corner portion configured to connect the top portion and the side-wall portion, with a gap of 0.2 mm or more and 3 mm or less from the outer surface of the top portion, the outer surface of the side-wall portion, and an outer surface of the corner portion; and a coating film of an electrodeposition paint formed in the gap.

Abstract: A vibration and noise reduction analysis device for a panel part of an automobile is configured to reduce vibration and noise of the panel part caused by vibration from a vibration source and a noise source in the automobile and identify a portion at which a weight of an automotive body of the automobile can be reduced. The vibration and noise reduction analysis device includes: an automotive body model acquisition unit; a sectioned region setting unit; a vibration and noise reduction target panel part model setting unit; a vibration mode/equivalent radiation power peak frequency selection unit; a sectioned region weight change peak frequency acquisition unit; a sectioned region weight contribution degree calculation unit; and a vibration and noise reduction and weight reduction portion identification unit.

Abstract: An automotive crashworthiness energy absorptive part absorbs crashworthiness energy by crushing axially when a crashworthiness load is input from a front side or a rear side of an automotive body, and includes: a tubular member formed of a steel sheet with a tensile strength of 590 MPa to 1180 MPa, the tubular member including a top portion and a pair of side wall portions continuous from both ends of the top portion via corner portions; a closed cross section space forming wall member formed of a steel sheet with a tensile strength lower than the tubular member, the closed cross section space forming wall member being disposed on an inner surface side of the tubular member and forming a closed cross section space between the closed cross section space forming wall member and at least the corner portion; and a resin provided in the closed cross section space.

Abstract: A peening method which can sufficiently improve fatigue properties of a lap fillet welded joint having a thin steel sheet as a base sheet, in which a knocking pin having a predetermined shape is continuously knocked as a series of knocking toward a direction inclined relative to the welding direction, the series of knocking is repeatedly performed in the welding direction, at that time, a knocking mark group made of a plurality of knocking marks formed by the series of knocking is superimposed on at least a part of an adjacent knocking mark group while an end part in the direction orthogonal to the welding direction of the knocking mark group is separated from an end part in the direction orthogonal to the welding direction of the adjacent knocking mark group.

Abstract: A vibration noise reduction analysis method for automotive panel parts acquires optimal distribution of beads to be provided in an automotive panel part to reduce noise caused by vibration of the panel part. The vibration noise reduction analysis method is executed by a computer, and includes: an automotive body analysis model acquiring step; an analysis condition setting step; a single-bead arranged area setting step; a bead parameter distribution acquiring step; an equivalent radiated power (ERP) reacquisition step; a bead parameter distribution acquisition step on a minimum ERP in bead-arranged area; and an optimal bead distribution determination step. The bead parameter distribution acquiring step includes: a bead parameter selection step; a bead parameter distribution analysis model generation step; and a bead parameter design variable distribution analysis step.

Abstract: An automotive crashworthiness energy absorption part for being provided on a front part or a rear part of an automotive body includes: a tubular member formed using a hat-shaped section part including a top portion and a side-wall portion; a coating part configured to form a coating film arranged with a gap of 0.2 mm to 3 mm from an inner surface of the top portion, an inner surface of the side-wall portion, and an inner surface of a corner portion, on a portion including the corner portion connecting the top portion to the side-wall portion in the inner surfaces of the top portion and the side-wall portion, the coating part being made of a material having strength lower than the tubular member; and a coating film of an electrodeposition paint formed in the gap.

Abstract: A vibration noise reduction analysis method for automotive panel parts is executed by a computer and used for reducing vibration noise in a panel part caused by vibrations transmitted from an exciter of an automobile to the panel part through vibration transmission frame parts. The vibration noise reduction analysis method includes: an automotive body mesh model acquisition process; a specific frequency band selection process for a vibration noise reduction target panel part model; a vibration transmission frame part model specification process; an individual mesh sheet thickness optimization process; a divided area setting process for a vibration transmission frame part model; an individual divided-area sheet thickness optimization process; and a divided area/optimal sheet thickness determination process for a vibration transmission frame part.

Abstract: An automotive crashworthiness energy absorption part provided at a front part or a rear part of an automotive body and absorbing crashworthiness energy by undergoing axial crush when receiving input of a crashworthiness load from a front or a rear of the automotive body includes: a tubular member configured to absorb crashworthiness energy by undergoing axial crush, the tubular member including a top portion and side wall portions continuous with the top portion; and resin coated or patched on first outer surfaces including at least outer surfaces of the top portion and the side wall portions of the tubular member. The coated or patched resin has a thickness of 8 mm or less after being heated, forms at least part of a peripheral wall portion of a closed cross section space, and is bonded to the first outer surfaces with an adhesive strength of 10 MPa or more.

Abstract: A needle-peening method of peening a weld toe of a welded joint for welding and joining two pieces of sheet metal using a peening pin includes vibrating one or a plurality of the peening pins in a center axis direction; rotating the one peening pin about a single rotation axis parallel to the center axis while the center axis of the one peening pin is offset from the rotation axis, when using the one peening pin; rotating the plurality of the peening pins about the rotation axis, when using the plurality of the peening pins; and moving the one or plurality of the peening pins along the welding direction to peen the weld toe, wherein a radius of curvature of a cross section perpendicular to a welding direction at a distal end part of the peening pin is equal to or larger than 0.05 mm and smaller than 1.00 mm.

Abstract: A crashworthiness energy absorption part includes: a tubular member having tensile strength of 590 to 1180 MPa grade; a closed cross section space forming wall part having tensile strength lower than the tubular member and having both edge portions joined to inner surfaces of a pair of side wall portions of the tubular member, and forming a closed cross section space between the closed cross section space forming wall part and a part of a peripheral wall portion of the tubular member; and a resin configured to fill the closed cross section space, includes a rubber-modified epoxy resin and a curing agent, and has tensile breaking elongation of 80% or more, adhesive strength to the tubular member and closed cross section space forming wall part of 12 MPa or higher, and a compression nominal stress of 6 MPa or higher at a compression nominal strain of 10%.

Abstract: A side crash test apparatus 1 according to the present invention uses a crash test structure 100 having a center pillar 101, a roof-rail simulated part 103, and a rocker simulated part 105 to perform a side crash test for the center pillar 101, and includes a rocker support 7 having a rocker-rotation braking mechanism 9 that supports each of a front end and a rear end of the rocker simulated part 105, restrains translation of the rocker simulated part 105, and supports the rocker simulated part 105 to be rotatable about an axis thereof and allow braking of the rotation, and the rocker-rotation braking mechanism 9 includes a rocker-rotation support member 19 that rotates together with the rocker simulated part 105, and a rocker-rotation braking plate 25 that brakes the rotation of the rocker-rotation support member 19.

Abstract: An automotive crashworthiness energy absorptive part to be provided at a front portion or a rear portion of an automotive body, the automotive crashworthiness energy absorptive part including: a tubular member configured to be axially crushed to absorb crashworthiness energy, the tubular member having a top portion and side wall portions continuous to the top portion; and a resin configured to coat or patch at least inner surfaces of the top portion and the side wall portions of the tubular member, wherein the coated or patched resin has a thickness of 8 mm or less after being heated and forms at least a part of a peripheral wall portion in a closed cross-sectional space, and adheres to the inner surfaces with an adhesive strength of 10 MPa or more.

Abstract: An automotive frame part is provided to a side portion of an automotive body and absorbs crashworthiness energy by bending upon receiving a crashworthiness load from a side of the automotive body. The automotive frame part includes: a member having a hat-shaped cross section or a U-shaped cross section and including a top portion, and a pair of side wall portions that are continuous from the top portion via punch shoulder R portions; and resin that is coated on or patched to an internal surface of the member having the hat-shaped cross section member or the U-shaped cross section. The resin extends at least to a predetermined range toward the top portion and the side wall portions on both sides of the punch shoulder R portions, and is adhered, after heating, to the internal surface at an adhesive strength of 10 MPa or higher at a room temperature.

Abstract: A lap-fillet arc welding joint includes a weld bead, the weld bead being formed on an end portion of one sheet of overlapped two sheets and a surface of other sheet along the end portion. The other sheet includes a projecting portion projecting from the surface at a side of a weld toe of at least one of a start portion and a termination portion of the weld bead. The weld toe is located on a slope surface portion of the projecting portion at a side of the end portion of the one sheet.

Abstract: A peening method which can sufficiently improve fatigue properties of a lap fillet welded joint having a thin steel sheet as a base sheet, in which a knocking pin having a predetermined shape is continuously knocked as a series of knocking toward a direction inclined relative to the welding direction, the series of knocking is repeatedly performed in the welding direction, at that time, a knocking mark group made of a plurality of knocking marks formed by the series of knocking is superimposed on at least a part of an adjacent knocking mark group while an end part in the direction orthogonal to the welding direction of the knocking mark group is separated from an end part in the direction orthogonal to the welding direction of the adjacent knocking mark group.