Accession Number:

AD0730677

Title:

Effect of Modulus Ratio on Stress near a Discontinuous Fiber.

Descriptive Note:

Technical rept.,

Corporate Author:

WATERVLIET ARSENAL N Y

Personal Author(s):

Report Date:

1971-05-01

Pagination or Media Count:

28.0

Abstract:

The effect of the fiber to matrix modulus of elasticity ratio varying from 1.0 to 200 was investigated for a two-dimensional plane stress composite configuration having a simulated fiber volume fraction of 0.45 and containing a discontinuous fiber. Uniaxial loading parallel to the fibers was considered. Two independent techniques were used moire strain analysis, and finite element analysis. Displacements were measured from four experimental models by utilizing optical fringe multiplication techniques. The finite element method yielded stresses which agreed closely with those obtained from the experimental analysis. Matrix stress concentration factor near the discontinuous fiber was found to increase rapidly with increasing modulus ratio, reaching a value of 20 for a modulus ratio of 200. The finite element method was shown to be a valuable tool for micromechanical stress analysis of composite materials, and the accuracy of strain analysis by moire fringe multiplication techniques was demonstrated for problems containing severe strain gradients. Author-PL

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE