Triaxial Weaving
Properties
Triaxial fabrics often have good strain resistance - due to the fibres
travelling in three directions. Planar shear resistance is usually good - due
to locked intersections. They also often have good tear resistance, abrasion
resistance, bursting resistance and impact resistance.
Statistics
Some calculations relating to triaxial weaving:
| \ |
Relative density |
| Rectangular |
2.00 |
| Triaxial (sparse) |
1.00 |
| Triaxial (dense) |
3.00 |
Ribbon-based model
| \ |
Relative density |
Sphere seive: cost |
Disc seive: cost |
| Rectangular |
2.00 |
2.00 |
2.82 |
| Triaxial (sparse) |
1.73 |
3.00 |
3.46 |
| Triaxial (dense) |
5.19 |
3.00 |
3.46 |
| Diamond |
2.31 |
2.00 |
4.00 |
| Hexagonal |
1.15 |
1.00 |
1.15 |
Wire-based model
The figures are derived from models based on "ribbon" or "wire".
The "ribbon" is considered to be a material which is very wide in one
dimension, while very narrow in another. The "wire" is considered to be a very
thin, but highly inflexible material. In practice, most real materials will
fall somewhere between these extremes.
Sparse triaxial weaving using ribbons typically uses 50% of the quantity of
material to cover the same area as rectangular rectangular weaving - while
dense triaxial weaving uses 150% of material to cover the same area.
If the material is ribbon-like> the difference in density between
rectangular weaving and sparse triaxial weaving is dramatic. However - if the
material is wire-like, there may not be very much in it.
Seive application
Since the sparse triaxial fabric has holes in it, one obvious application
is seives. Books of Japanese basketry illustrate bamboo strainers constructed
using triaxial weaving.
The "seive" costs in the table were intended to determine whether it makes
financial sense to build seives out of triaxial woven fabrics. Two sorts of
seive were considered - based on whether the objects being seived were spheres
or discs. The figure represents the material cost (per unit area) to prevent
the passage of objects with diameter 1 unit.
The "Hexagonal" entry is not really a weave - it is a configuration
similar to a wire-net. It is impossible to construct it using continuous
strands. The figures given there are to allow comparisons with an "ideal"
arrangement.
Even if you ignore the problems caused by the variable-size pores; triaxial
weaving probably makes little sense in the context of constructing
seives.
Tim Tyler |
Contact |
http://hexdome.com/
|