Page 93 - Handbook of Properties of Textile and Technical Fibres
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74 Handbook of Properties of Textile and Technical Fibres
Figure 3.14 Jig to allow tensile tests to be
carried out in water using a standard upright
tensile tester.
300 mm. This is roughly equal to a single day’s growth and has been attributed to the
animal’s individual and daily biological cycle (circadian rhythm) (Wortmann et al.,
2000). Because of this nonuniformity, workers (Gourdie et al., 1992; Thompson,
1998; Huson and Turner, 2001; Huson and Maxwell, 2004) often measure the diameter
of the fiber after failure, generally after allowing the deformed fiber to recover in water.
100
65% RH Wet
75
Force (mN) 50
25
0
0 2 4 6 8 10 12
Extension (mm)
Figure 3.15 Typical forceeextension curves for Merino wool fibers of 21 mm diameter and
20 mm gauge length, tested in air and water.
