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Fig. 2. The longitudinal stress-strain behavior of a wool fiber in water at
20°C at 0.1% strain min-1; six cycles at a maximum strain of
20% (modelled after fig. 3.19a
in Feughelman, 1997). The area
denoted with an `A' exists to about 2% strain and is termed the Hookean region
due to its linear elastic behavior. Area `B' exists from about 3% strain to as
much as 30% strain and is termed the `yield' region because it follows an
apparent yield point where the Hookean region and its respective modulus
undergoes a reversible order-of-magnitude decrease in elastic modulus. For
mechanical parameters, see Introduction.
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