JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Lower jaw of extending stage Microswitch cut-out Top plate with strain Micromotor gauges attached / / ....... ., ..".' - ,.' ,TZ•' Strain gauge con nections Figure 13. The specimen stage used for extending hair loops. Figure 15. Load/extension curve obtained during a 'static-loop' breaking experiment. The sequence of still micrographs was photographed from the TV screen during the experiment. Irregularities in the curve just before fracture relate to the breakdown of structural elements in the hair fibre.
JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 16. Static loop break, root end of fibre. A single shot from the TV screen showing cuticle cell lifting just before fracture. b Figure 17. A sequence taken just after the point in Fig. 16 showing the initia- tion of fracture.
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