NASA 4750 Manual

A SERVICE OF

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SUMMARY OF AVAILABLE CODES

8-17

8.7 WEAVE

Author:

Brian Cox

Ref

erences

:

B.N. Cox and M.S. Dadkhah, “The Macroscopic Elasticity of 3D Woven

Composites,” J. Composite Materials, 29[6], 785-819, 1995.

B.N. Cox, “Failure Models for Textile Composites,” NASA CR 4686, August,

1995.

M. S. Dadkhah, J. G. Flintoff, T. Kniveton, and B. N. Cox, “Simple Models for

Triaxially Braided Composites,” Composites 26[8], 561-77 (1995).

User

Manual

:

Brief description of required input provided as electronic file with program.

Format:

FORTRAN code which may be compiled for target machine.

Geometric

Model:

The volume fraction assigned to stuffers, fillers, and warp weavers is required. The

code covers orthogonal interlock, layer-to-layer angle interlock, and through-the-

thickness angle interlock. Waviness of stuffers and fillers is accounted for by

allowing the user to input statistical data for angle variation. Warp weaver

orientation is assumed to be either normal to plane (orthogonal interlock), or at 45°

for the angle interlocks (controlled by an internal data statement).

Stiffness

Model:

Orientation averaging, with tow stiffness knockdowns based on statistics of

waviness. Tow stiffness is computed from constituent data (fibers and matrix)

using one of five standard micromechanical models.