Accession Number:

AD0754763

Title:

Molding of Oriented Short Fiber Composites. I. Ultimate Tensile Properties

Descriptive Note:

Corporate Author:

MONSANTO RESEARCH CORP ST LOUIS MO

Personal Author(s):

Report Date:

1972-12-01

Pagination or Media Count:

70.0

Abstract:

Several aspects of composite structure that affect the mechanical performance of polymers reinforced with short fibers are fiber length, fiber concentration, void content, dispersion of fibers, fiber orientation, and wetting. This report describes the dependence of these structural variables on the molding compound composition and on the processing conditions for flow plunger moldings of epoxy resin reinforced with short glass fibers. The methods used in this study for characterizing the composite structure are also presented. Since the primary structural variables mentioned above cannot in practice be changed independently, the measured tensile strengths and ultimate elongations of molded specimens are correlated directly with the preparation techniques and processing conditions used in their fabrication. It is found that voids, wetting, and dispersion are not critical when the fibers are properly aligned into the direction of highest stress. The fibers must be equal to or longer than one-eighth of an inch to sustain high loads in the epoxy system studied.

Subject Categories:

  • Refractory Fibers
  • Laminates and Composite Materials
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE