Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1987-02-13
1990-04-17
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
422105, 422114, 422212, 422213, 422285, 422408, 422902, B32B 702
Patent
active
049179381
ABSTRACT:
A structure and a method of producing such structure which includes a fiber reinforced composite article in which the surface of the article will generate a visible indication thereon upon impact of the surface by another object. The method comprises laying up multiple layers of a first material into the shape of the desired composite article. A relatively thin layer of a second filamentary material is then layed up on and bonded to the surface of the base structure formed by the layers of the first material. The second filamentary material forms a thin outer layer on the composite article, and upon impact of the outer layer with another object, the outer layer delaminates and forms a discoloration in the form of a whitened patch or spot in the immediate vicinity of the impact. The articles so produced can be visually inspected for damage, and only those articles showing a surface discoloration need be subjected to nondestructive testing. Further, only the portion of the article in the vicinity of the discoloration need to tested.
REFERENCES:
patent: Re31047 (1982-10-01), Ross
patent: 4035550 (1977-07-01), Suh et al.
patent: 4043703 (1977-08-01), Carlson
patent: 4373555 (1983-02-01), Mattuck et al.
patent: 4617213 (1986-10-01), Asano et al.
patent: 4677020 (1987-06-01), Takagi et al.
Bell James J.
EDO Corporation
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