Fig. 2. Relationship between cross-sectional area of intact red fibres expressed as
a fraction of total fibre area (intact+damaged) and the area of all fibres.
The points are the observed values. The lines were calculated using the
following equation on the assumption that damaged fibres were confined at a
layer of either one (solid line) or two (broken line) fibres on the surface of
the bundle and that the bundle is circular in cross section:
l/A=[(4A/
)0.5-2d]2/(4A),
where l is the area of intact fibres, A is the area of all
fibres (intact+damaged) and d is the thickness of the layer of
damaged fibres. The solid line was calculated using d=81.1 µm,
which is the median fibre diameter measured here (see text), and the broken
line assuming that the damaged layer is two fibres thick, i.e.
d=162.2 µm.