Nippon Steel Corporation

Takahiro Aitoh

Yoshiyuki Kaseda

Yasuhiro Ito

Takeshi Kawachi

Toshiyuki Niwa

Yusuke Tsunemi

Nobuyuki Maniwa

A curved panel part includes: a curved panel made of metal; and a reinforcement joined to the curved panel and made of a plurality of FRP layers including continuous fibers, in which each of the plurality of FRP layers has a single fiber direction, at least one layer out of the plurality of FRP layers has a fiber direction different from that of another layer, in the plurality of FRP layers, a proportion of layers having an angular difference in the fiber direction of 30° or more is 15% or more of all of the layers, and when calculating, by defining a maximum principal curvature direction of the curved panel as a 0° direction and a direction orthogonal to the 0° direction as a 90° direction, each of a 0° direction component and a 90° direction component regarding the fiber direction of each FRP layer of the reinforcement joined to the curved panel, by using a trigonometric function, an expression (1) is satisfied.

Curved panel part

A panel structure includes: a panel made of metal; and a reinforcement joined to the panel and made of a plurality of FRP layers including continuous fibers, in which each of the plurality of FRP layers has a single fiber direction, at least one layer out of the plurality of FRP layers has a fiber direction different from that of another layer, in the plurality of FRP layers, a proportion of layers having an angular difference in the fiber direction of 30&#xb0; or more is 15% or more of all of the layers, and when calculating, by defining a long side direction being a long direction of a long edge of the panel as a 90&#xb0; direction and a direction orthogonal to the 90&#xb0; direction as a 0&#xb0; direction, each of a 90&#xb0; direction component and a 0&#xb0; direction component regarding the fiber direction of each FRP layer of the reinforcement joined to the panel, by using a trigonometric function, an expression (1) is satisfied.

Panel structure

A structural member for vehicleincludes: a hollow membermade of metal, the hollow memberincluding cutout forming portionsarranged along a member longitudinal direction of the hollow member, the cutout forming portionseach having a cutout; and reinforcing partsmade of FRP, the reinforcing partsbonded to the hollow member, the reinforcing partscovering each of the cutoutsin each of the cutout forming portions, in which a first cutout forming portionhaving the cutoutin the first region Rand a second cutout forming portionhaving the cutoutin the second region Rare arranged alternately along the member longitudinal direction of the hollow member

Structural member for vehicle

A break prediction method according to the present invention predicts a break of a joint portion of an object to be analyzed including a pair of members joined to each other by using a finite element method, and includes a first step of acquiring at least an element size of a base material portion, from among parameters set in an element model for the object to be analyzed; a second step of calculating, as a break discernment standard, a break limit moment defined by a function including the element size of the base material portion as a variable; and a third step of discerning whether the moment applied to the joint portion in a deformation analysis of the element model for the object to be analyzed exceeds the break limit moment, and outputting the result of the discernment as a break prediction result for the joint portion.

Break prediction method, break prediction device, program, recording medium, and break discernment standard calculation method

In a deformation simulation of a member joined by spot welding, an effective width being a width in a direction intersecting a direction of a load centered on a spot welded portion () on a flange face () where the spot welded portion () is provided of a member () and changing correspondingly to a change in the load is calculated every predetermined time interval, and fracture of the spot welded portion () is predicted using the calculated effective width. This configuration enables precise fracture prediction of a spot welded portion where spot welding is modeled, for example, in a case of performing collision deformation prediction of an automobile member on a computer.

Fracture prediction method and device, program, and recording medium

A joint provided with a base part, a pair of side partsextending from the two end parts of the base partin the first direction Dto the same side in the second direction Dvertical to the first direction D, the pair of side partsbeing formed with fastening holesH at the center in a third direction Dvertical to both the first direction Dand second direction D, and a closed partformed between the pair of side partsas an extended region of the base partand pair of side partsat least at one end in the third direction D

Growing community of inventors

Tokyo, Japan

Takahiro Aitoh