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US 9,850,660 B2Granted
Sandwich panel with a ductile hybrid core comprising tubular reinforcements
AssigneeBoard of Supervisors of Louisiana State University and Agricultural and Mechanical College
InventorsGuoqiang Li, Gefu Ji
Life of this patent
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Abstract
A hybrid core comprising a matrix and tubular structural reinforcements, such as a ductile matrix core reinforced with ductile hollow tubes, as well as panels which comprise such hybrid core. Embodiments of the invention manifest resistance to both interfacial debonding and ballistic penetration.
Claims7
A composite material comprising a matrix and a grid;
- wherein:
- (a) said matrix comprises polymer;
- (b) said grid comprises a plurality of layers, wherein each said layer comprises a network of mechanically interlocking millitubes or microtubes;
- (c) said polymer has an elongation at break from 3% to 200%;
- an elastic modulus from 1.5 GPa to 350 GPa;
- and an ultimate tensile strength from 25 MPa to 350 MPa;
- (d) said millitubes or microtubes comprise hollow, shape memory-alloy tubes, with a diameter of 3 mm or less;
- an elongation at break from 3% to 100%;
- an elastic modulus from 1 GPa to 1000 GPa;
- and an ultimate tensile strength from 1 MPa to 1000 MPa;
- (e) i) said layers that are adjacent to one another are interwoven with one another;
- or ii) said adjacent layers comprise indentations that are interposed or seated within one another, or both;
- or both i) and ii);
- (f) said matrix surrounds and provides support to said grid, and said grid confines and increases the strength of said matrix.
11 more elements
Dependencies are inferred from the claim text.