SANDWICH TYPE LOAD BEARING PANEL

摘要

A sandwich type load bearing panel (1) with a transversely shear stiff core (3) and a plurality of individual unidirectional plies respectively for a first and a second composite layer (2, 4), bonded each to one of the main surfaces of the core (3). The first composite layer (2) is a continuous and monolithic assembly and the second layer (4) is an open net of intercrossing strips (4a, 4b, 4c) running along at least three directions and being laid up of said plurality of individual unidirectional plies.

主权项

1. A sandwich type load bearing panel with:
a shear stiff core with two main surfaces opposed to each other, a plurality of individual unidirectional plies of fiber reinforced plastic respectively for a first and a second composite layer, bonded each to one of the main surfaces of the shear stiff core;wherein:
the first composite layer is a continuous and monolithic assembly of said plurality of individual unidirectional plies; the second layer is an open net of intercrossing strips running along at least three directions, each intercrossing strip is laid up of said plurality of individual unidirectional plies, the unidirectional plies of each intercrossing strip being oriented along their respectively associated intercrossing strip's direction, the intercrossing strips having a constant width along one of said at least three directions, the strips having a width-to-thickness ratio of 5 to 60, a minimum width of 6 mm and a thickness of 0.2 mm to 3.5 mm, the strips of equal direction being separated from each other by a distance of 3 to 10 times their width; and the core has a transverse shear modulus >10 MPa and has between the two main surfaces a uniform thickness along the interfaces of the strips with the one of the two main surfaces over an area enclosing along each of said at least three directions respectively at least five strips of the same direction, wherein the structured shear stiff core has a constant thickness along the contacts with the strips of the second inner composite layer and in that the structured shear stiff core is provided with a blind indentation at each of the mesh pockets of the inner meshed layer between the strips.