Laminated structural article with constituent elements having in

Details Laminated structural article with constituent elements having in Laminated structural article with constituent elements having in

1972-12-04

1976-03-23

Lesmes, George F.

Stock material or miscellaneous articles

Two dimensionally sectional layer

Next to unitary web or sheet of equal or greater extent

244133, 428 54, 428 55, 428109, 428114, 428189, 428212, 428902, B32B 310

Patent

active

039461270

ABSTRACT:
A functionally improved tape-like, heterogeneous, strip material for use in the fabrication of laminated structural shapes having high value of Young's Modulus and high tensile strength, comprising collocated, unidirectional, tectonic filaments such as graphite, boron, silicon-carbide, S-glass and E-glass, embodied in planar concourse, into an organic, thermosetting resin matrix or sheath such as an epoxy or polyimide base polymer forming a basal tract having at least one integral marginal tract of differing physical character so that a relatively lower Young's Modulus is exhibited by the material comprising the marginal tract than that exhibited by the basal tract. This difference in structural characteristic serves to provide an inherent arrestment barrier against fast rupture propagation of fractures which may develop in the basal tract material when the composite strip is subjected to sustained overload or external damage. Structural composite shapes fabricated from precisely oriented strips, in ply-by-ply lamination, acquire this same fracture propagation arresting capability when all strips are oriented in such manner, during the laminating process or ply-by-ply build-up into a multiple layer composite of known toughness and stiffness, that the basal tracts or prime portions and the marginal tracts or edge portions of all strips disposed in a given direction in one ply of the laminate are in a vertically aligned pattern with the strips in all other plies or the laminate which extend in the same direction.

REFERENCES:
patent: 3391050 (1968-07-01), Nebesar
patent: 3462289 (1969-08-01), Rohl et al.
patent: 3649435 (1972-03-01), Varlas
patent: 3756905 (1973-09-01), Mills et al.
patent: 3767499 (1973-10-01), Koss

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