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Title: Fabrication method for cores of structural sandwich materials including star shaped core cells

A method for fabricating structural sandwich materials having a core pattern which utilizes star and non-star shaped cells. The sheets of material are bonded together or a single folded sheet is used, and bonded or welded at specific locations, into a flat configuration, and are then mechanically pulled or expanded normal to the plane of the sheets which expand to form the cells. This method can be utilized to fabricate other geometric cell arrangements than the star/non-star shaped cells. Four sheets of material (either a pair of bonded sheets or a single folded sheet) are bonded so as to define an area therebetween, which forms the star shaped cell when expanded.
Inventors:
 [1]
  1. (Danville, CA)
Issue Date:
OSTI Identifier:
871048
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5647933
Application Number:
08/448749
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
fabrication; method; cores; structural; sandwich; materials; including; star; shaped; core; cells; fabricating; pattern; utilizes; non-star; sheets; material; bonded; single; folded; sheet; welded; specific; locations; flat; configuration; mechanically; pulled; expanded; normal; plane; expand; form; utilized; fabricate; geometric; cell; arrangements; pair; define; therebetween; forms; shaped cells; flat configuration; fabrication method; materials including; sandwich materials; structural sandwich; star shaped; cell arrangement; shaped cell; bonded sheet; /156/428/