| Titre : |
The measurement of elongation at break in the leather testing |
| Type de document : |
texte imprimé |
| Auteurs : |
R. Guy, Auteur ; A.-G. Marriott, Auteur |
| Année de publication : |
1974 |
| Article en page(s) : |
p. 137-144 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Allongement à la rupture
Cuirs et peaux -- Propriétés mécaniques
Essais de résilience
Essais dynamiques
Mesure
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
The separation of the bench marks and jaws have been used to calculate the elongation at break of two leathers using the 1957 SLTC specimen shape and the current IUP/6 large specimen. Two tensometers were used, an Instron and a 250 kg Howden. The jaw design is crucial if jaw separation measurements are used. Positive clamping is essential and self-tightening jaws should be avoided. The IUP/6 specimen gave lower but more reproducible values than the 1957 SLTC specimen. Jaw separation measurements were more reproducible than those from bench marks.
In a separate experiment the three IUP/6 specimens, a modified version of the medium-size specimen and the 1957 SLTC specimen were compared. Seventeen leathers were tested using the Instron only. The results from the 1657 SLTC specimen by bench mark separation are very close to those obtained from the medium and small IUP/6 specimens by jaw separation. The large IUP/6 specimen gave lower but more reproducible values than any other specimen. The 1957 SLTC specimen gave worst reproducibility. |
| Note de contenu : |
- COMPARISON OF 1957 AND THE LARGE IUP/6 SPECIMEN : Experimental - Results - Discussion
- COMPARISON OF FIVE SPECIMEN SHAPES : Experimental - Results
- Fig.1 : (a) 1957 STLC specimen, dimensions in inches. (b) IUP/6 specimens, dimensions in mm.
- Fig.2 : Large IUP/6 specimen clamped by (a) Instron pneumatic jaws (note the 1.0 mm grid used to measure elongation at 25 kg). (b) Howden self-tightening wedge jaws (note the jaw slip as shown by original jaw lines).
-Fig.3 : The effect of specimen width on the elongation at break of the large IUP/6 test specimen, means of 12 determinations.
- Fig.4 : Jaw distortion of large IUP/6 and 1957 SLTC specimens, 2.5 "spaces" visible in each case.
- Fig.5 : The model of 1957 SLTC specimen used in calculating the difference in elongation at break as given by jaw separation and bench marks.
- Table 1 : IUP/6 Test Piece Dimensions
- Table 2 : Elongation at break (%) from specimens tested on the instron
- Table 3 : Elongation at break (%) effects of specimen, direction and method of measurement for firm leather around the O.S.P.-Intron tests
- Table 4 : Standard error of a single observation, Intron tests
- Table 5 : % Elongation at break, Howden test
- Table 6 : Standard error of a single observation, Howden test
- Table 7 : Elongation at 25 kg load (%), Instron tests
- Table 8 : %Elongation at 25kg load, Instron tests
- Table 9 : Elongation at break (%) of five specimen shapes, measured by two methods
- Table 10 : Standard error of a single observation for various specimens and methods of measurement
- Table 11 : "Number of spaces showing" at break. Five specimen shapes (see text for an explanation of the terms)
- Table 12 : "Corrected" elongation at break from jaw separation, IULCS specimens |
| En ligne : |
https://drive.google.com/file/d/1icIjo9ND6eAPJxvpgb3cj4sRjkzFYeT1/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33144 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58, N° 1 (11-12/1974) . - p. 137-144
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The measurement of elongation at break in the leather testing in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58, N° 1 (11-12/1974)
