Accession Number : AD0917472

Title :   Prestressing of Boron and Graphite Epoxy Prepreg for Composite Strength Improvement.

Descriptive Note : Final technical rept. Dec 71-Mar 73,

Corporate Author : NORTHROP RESEARCH AND TECHNOLOGY CENTER HAWTHORNE CALIF

Personal Author(s) : Mills,George J. ; Brown,Gary G. ; Waterman,Dwight D.

Report Date : JUN 1973

Pagination or Media Count : 157

Abstract : The feasibility of prestressing commercial boron/epoxy and graphite/epoxy prepreg material to higher strengths and lower property dispersions is demonstrated. Its practical application as an on-line process for improving quality levels is possible with minor modifications to current experimental practice. The mechanics of the bendstressing method affects a controlled alteration in the fiber defect content to the extent that composite improvements can be achieved approaching the inherent fiber quality with dispersions in properties reduced to the 1 to 2% range. (Author, modified-PL)

Descriptors :   (*Filaments, Strength(Mechanics)), (*Prestressing, Filaments), (*Composite materials, Filaments), (*Boron, Filaments), (*Epoxy resins, Composite materials), (*Graphite, Composite materials), Manufacturing, Processing, Synthetic fibers, Laminates, Mechanical properties, Tensile properties, Tension, Defects(Materials), Failure(Mechanics), Fracture(Mechanics), Fatigue(Mechanics), Reliability, Standard deviation, Test methods, Fibers

Subject Categories : Laminates and Composite Materials
      Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE