Patent ID: 11945205
Assignee: NIPPON STEEL CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A curved panel part, comprising:
a curved panel made of metal; and
a reinforcement joined to the curved panel and made of a plurality of fiber reinforced plastic (FRP) layers including continuous fibers, wherein:
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, a following expression (1) is satisfied:

580×K≤(A×4+B)/(C+D)  (1)

A: the 0° direction component of the FRP layers positioned on an outer side of a center of a sheet thickness of the reinforcement
B: the 0° direction component of the FRP layers positioned on an inner side of the center of the sheet thickness of the reinforcement
C: the 0° direction component of the plurality of FRP layers as a whole
D: the 90° direction component of the plurality of FRP layers as a whole
K: 1/curvature radius of the curved panel in the 0° direction (mm).