Accession Number:

ADA018081

Title:

Modified Composite Structures.

Descriptive Note:

Final rept.

Corporate Author:

ANALY-SYN LABS INC PAOLI PA

Personal Author(s):

Report Date:

1975-06-01

Pagination or Media Count:

14.0

Abstract:

One of the principal failure modes of fiber-reinforced resins is interlaminar shear. This task addresses a possible solution to this defect by linking the laminate plies with fibers inserted through the plies in a direction normal to the surface of the laminate. The present task proposes to simplify the vertical threading step in 3-D type fabric structures by a procedure akin to the hooking of rugs - hereinafter described by the more generic term of needling. The needling process appears entirely feasible for introducing vertical fibers in rows as close as 18 in. apart. Two types of standard industrial sewing machines were used, each operating without the interlocking thread reel bobbin beneath the machines table. No consistent benefit from the needling treatment could be demonstrated in the cured laminates using ASTM flex and shear tests as criteria.

Subject Categories:

  • Refractory Fibers
  • Laminates and Composite Materials
  • Textiles
  • Plastics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE