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(41C) Analysis of Woven Fabrics for Reinforced Composite Materials - SlideRule - 01-26-2019 06:53 PM
An extract from Analysis of Woven Fabrics for Reinforced Composite Materials, NASA, MSC TFR 1715/0210, AUG 1987 (248 pages).
EFFECTS OF THRU THE THICKNESS RUNNING ELEMENTS
The procedure to analyze special weaves having thru the thickness running elements is essentially similar to that outlined above. The basic repeating elements of the weaves are first identified. The yarns are then divided into straight segments, curved segments or segments of any of the standard weaves described earlier. Further sub-division of the curved segments may be done as required. The sets of volume fractions and direction numbers of the various yarn bundle segments used to model the weave are used by "NDPROP"to calculate the elastic properties.
For filaments without curved segments algebraic equations representative of the NDPROP analysis were derived for the strength and stiffnesses properties of 3-D, 0° /± Φ° /90° /90°, configurations. These equations, are readily programmable for a hand-held calculator. Programs for the Hewlett-Packard 41-C are included with the equations in Appendix C. (pages 201-231)
APPENDIX C, CALCULATOR PROGRAMS
A programmable hand-held calculator, such as the Hewlett-Packard 41-C is adequate for preliminary surveys of properties of 3-D composites. Four programs developed for the 41-C for such surveys are included in this appendix, as follows:
_ UNI Elastic Constants for Unidirectionally Reinforced Composites
_ HYZ Elastic Constants and Strengths for 0° /± Φ° /90°ⓦ /90°ⓣ, 3-D Reinforcement Configurations with Y- and Z- Direction Filaments Hybrids
_ HY Same as HYZ with only Y-Direction Filaments Hybrid
_HZ Same as HYZ with only Z-Direction Filaments Hybrid
UNI, derived from the equations of reference C-1 is contained as a subroutine
in the other three programs. HYZ, HY and HZ, utilizes algebraic extensions of the effectiveness coefficient analysis of reference C-2. Resulting equations are given in Tables C-1 to C-9.
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