NASA 4750 Manual

A SERVICE OF

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SUMMARY OF AVAILABLE CODES

8-15

8.6 CCM-TEX

Author:

Kishore Pochiraju

Ref

erences

:

User

Manual

:

None provided. Data input is interactive with prompts.

Format:

FORTRAN code which may be compiled for target machine.

Geometric

Model:

The code treats 3-dimensional weaves and braids. Geometric idealizations are used

to compute yarn angles and fiber volume fraction.

Stiffness

Model:

Orientation averaging of stiffness (isostrain model).

Strength

Model:

Prints a predicted strength in the warp and weft directions. Strength calculation is

based on local stress in isostrain model and the specified tow strength.

Data

Required:

Yarn and matrix elastic constants and tow strength. Geometric input for 3D weave

includes weave pitch, width of unit cell, thickness of plate, number of axial yarns

per unit width and thickness, number of wefts per unit length and thickness, and

number of z weavers per unit width and thickness. Code distinguishes between

layer-to-layer and through-the-thickness angle interlock. For 2-step and 4-step

braiding, the code requires the braiding angle, tow size ratio (axial/braider), and

either the column and row numbers of axial yarns (2-step) or number of axial and

braider yarns (4-step).