| Titre : |
Grain crack and burst strength |
| Type de document : |
texte imprimé |
| Auteurs : |
Karl Flowers, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 54-58 |
| Langues : |
Anglais (eng) |
| Catégories : |
Anisotropie
Collagène
Cuirs et peaux -- Propriétés mécaniques
Essais de résilience
Essais dynamiques
Lubrification
Matériaux -- Fissuration
Résistance à l'éclatement
Résistance à la fissuration
Stratigraphie
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Leather is a collagen skeleton that has chemical groups attached to it, which can either enhance its natural strength or annihilate it. Collagen is a rope-like network, three-dimensionally woven into a net-like mesh. The rope-like fibres can be dispersed so that they operate more independently, or they can be crowded together to move with restriction, causing them to feel dense and full.
The spaces between the fibres and fibre bundles can be filled with interstitial materials that again restrict the freedom of fibre movement and, quite importantly, they can lower the porosity of the leather. Dense fibre structures begin to operate like reinforced concrete, the central fibre and surrounding packing material begin to co-operate as one unit and the collective strength they have is significantly higher than one fibre's individual strength.
The lubrication (plasticisation) of the fibres is also critical to material strength. The individual fibres must be made to be flexible to ensure movement and strength. The opposite effect - adding a retan to the fibre that makes it more brittle the opposite of the lubricating effect mentioned above. Leather is anisotropic, topographically and stratigraphically.
The focus of this article will be on the stratigraphic anisotropy - the phenomenon that considers fibre size and behaviour differences, as one transits from the grain to the flesh. |
| Note de contenu : |
- Crack and burst testing
- Brittle grain
- The influence of tanning
- Lubrication of the grain
- Fig. 1 : A hand powered lastometer - the apparatus used for ball and grain burst
- Fig. 2 : The clamp assembly of the lastometer showing a grain rupture (arrow)
- Table 1 : Current industry methods that test the ability of a leather to resist the grain from cracking |
| En ligne : |
https://drive.google.com/file/d/133e7dlqFVeWW24uJR5TwZAZgx7Cbi1vl/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33624 |
in INTERNATIONAL LEATHER MAKER (ILM) > N° 37 (09-10/2019) . - p. 54-58
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Grain crack and burst strength in INTERNATIONAL LEATHER MAKER (ILM), N° 37 (09-10/2019)
