Civil Engineering Reference
In-Depth Information
Figure 3-9
Bi-axial and Strip Tensile Specimens
B = specimen width, L = specimen length
Another type of biaxial test is the cylinder test. Here a cylinder of fabric is fitted with
a rubber liner and the cylinder is then inflated with air. This causes the fabric to
under- go biaxial stress. Fig 3-10 shows a typical biaxial test result from PTFE-coated
glass fabric and PVC-coated polyester fabric. Both of these tests were made on plain
weave fabrics with cruciform specimens. These curves somewhat resemble the stress-
strain curves for other engineered materials, but there are some significant differences
outlined below:
1 The difference between the behavior of the fabric in the warp and fill
directions.
2. The dependence of the ratio of warp to fill stress on the behavior warp and fill
fibers.
3. The difference of strain based on the 1
st
, 2
nd
and 3
rd
loadings.
4. The non-linearity of both warp and fill fibers.
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