Elasticity and setting of stretched leather / Albert M. Manich in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 2 (02/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 2 (02/2007) . - p. 43-51 Titre : Elasticity and setting of stretched leather Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; M. de Castellar, Auteur ; B. Gonzàlez, Auteur ; M. Ussman, Auteur ; Agusti Marsal, Auteur Année de publication : 2007 Article en page(s) : p. 43-51 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effect of stretching treatments on the balance between plasticity and elasticity of leather has been studied. Four different tanned and fatliquored bovine leathers were subjected to stretching treatments completely immersed in water. Variables of stretching were a) water temperatures between 60 and 80ºC, b) stretching ratios between 1.20 and 1.40 and c) stretching time between 10 and 20 min. Thickness and apparent density were measured. Variations in plasticity-elasticity balance induced by the stretching treatments were assessed subjecting the samples at two cycle loading-unloading test measuring the elongation induced by the maximum load in the first cycle, the Immediate Elastic Recovery, Delayed Recovery, Permanent Set and the Bedding-in Work Factor. Stretching favours the bedding-in and setting of the network of collagen fibres, increases the elasticity and decreases the plasticity of leather. When subjected to cyclic loading, straining induces additional bedding-in effect on the network of collagen fibres. Leather straining and their immediate elastic recovery and permanent set mainly depend on the applied load while delayed recovery and bedding-in is more dependent on the leather structure than on the load applied. En ligne : https://drive.google.com/file/d/1BIWCaRhEI8_t7kHW6cSzVbEKZo6J4uFY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3367 [article]

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Stretching and stress-relaxation of leather / Albert M. Manich in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 3 (05-06/2006)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 3 (05-06/2006) . - p. 102-107 Titre : Stretching and stress-relaxation of leather Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; M. D. de Castellar, Auteur ; B. Gonzàlez, Auteur ; M. Ussman, Auteur ; Agusti Marsal, Auteur Année de publication : 2006 Article en page(s) : p. 102-107 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de bovins Densité Etirement (mécanique) Matériaux -- Epaisseur Relaxation des contraintes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Four bovine leathers subjected to five stretching procedures in water at temperatures between 60 and 80°C with drawing ratios between 1.20 and 1.40 were analyzed to demonstrate the suitability of Nutting’s model to fit the stress-relaxation of samples strained at 20%. The influence of the specimen direction and the mechanical conditioning (subjected to two cycles of straining at different pre-loading level from 0.5 to 10daN) were considered. Nutting’s model gives estimators of the initial stress and the relaxation rate. The initial stress is influenced by stretching treatments, specimen direction and mechanical conditioning. The influence of the stretching treatments on the relaxation rate depends on the stretching ratio, temperature and type of leather. Note de contenu : - MATERIALS AND METHODS : Samples - Stretching procedure - Leather thickness and apparent density - Fitting Nutting's Relaxation Model - - RESULTS AND DISCUSSION : Thickness and Apparent Density - Stress relaxation - Table 1 : Drawing ratio, thickness and apparent density of the original and stretched samples - Table 2 : Initial Stress, Nutting’s law coefficients and correlation coefficients of Sample 1 and samples stretched by treatments A1 and A according to the pre-loading level and specimen direction - Table 3 : Initial Stress, Nutting’s law coefficients and correlation coefficients of Sample 2 and sample stretched by Treatment B according to the pre-loading level and specimen direction - Table 4 : Initial Stress, Nutting’s law coefficients and correlation coefficients of Sample 3 and sample stretched by Treatment C according to the pre-loading level and specimen direction - Table 5 : Initial Stress, Nutting’s law coefficients and correlation coefficients of Sample 4 and sample stretched by Treatment D according to the pre-loading level and specimen direction En ligne : https://drive.google.com/file/d/1iFSUUqLpfmPQZYO3i3qIQDfzVWW7ReQP/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39141 [article]

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