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Ajouter le résultat dans votre panier Affiner la rechercheA comparison of two tear tests for leather / R. Guy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
Titre : A comparison of two tear tests for leather Type de document : texte imprimé Auteurs : R. Guy, Auteur ; A.-G. Marriott, Auteur Année de publication : 1975 Article en page(s) : p. 30-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques
Déchirure (mécanique)
Essais de résilience
Essais dynamiques
Etudes comparativesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : It has long been accepted that high correlation exists between the tearing loads obtained from the Baumann tear test (IUP/8) and tha ALCA test E 10, slightly modified by SATRA and designated PM 30. Recently, however, the tearing energy has been put forward as a better criterion of tear resistance. The work described in this paper has therefore been concerned primarily with comparing various tearing criteria for the two test specimen shapes. It is concluded that the tearing energies obtained from the two tests correlate well with each other, although some semichrome leathers are anomalous. Note de contenu : - INTRODUCTION : A brief review of tear testing - Correlation studies of the tear tests
- EXPERIMENT I : Plan - Parameters measured - Statistical analysis and data processing - Results and discussion - Conclusions for Experiment 1
- THEORETICAL CONSIDERATION
- EXPERIMENT II : Factors varied - Results and discussion
- CONCLUSIONS FOR EXPERIMENT II
- Table 1 : Maximum tearing load (kg)
- Table 3 : Maximum tearing load per unit thickness for the two test methods (kg mm-1)
- Table 4 : Mean tearing loads for the four leathers and test methods (kg)
- Table 5 : Mean tearing load per unit thickness for the two test methods (kg mm-1)
- Table 7 : Mean energies of initiation for the four leathers and two test methods (J x 10 4)
- Table 8 : Total tearing energy per unit distance morved by tearing force, for the two methods and four leathers (kg)
- Table 9 : The maximum tearing load (kg) for the four leathers, two specimen shapes and four sizes of hole terminating the cut
- Table 10 : Maximum tear load (kg) for the two specimen shapes and the four leathers
- Table 11 : The average maximum tearing loads (kg) for the two specimen shapes and four sizes ofhole terminating the cut
- Table 12 : The average maximum tearing loads (kg) for the two sampling locations of the four leathers
- Table 13 : The average mean tearing loads for the four leathers and two basic specimen shapes (kg)
- Table 14 : The average initiation energies of tear (J x 10 4) for the four leathers, two test speciments and four sizes of holes
- Table 15 : The average initiation energies (J x 10 4) of tear for the four sizes of hole and the two specimen shapes
- Table 16 : The regression constants for energy of initiation versus hole size for four leathers and two specimen shapes
- Table 17 : Dependence of energy of initiation on speed of tearing
- Table 18 : The average total tearing energy per unit distance moved by tearing force for the four leathers, two specimen shapes and four hole sizes (Ag + Ap) tearing distance
- Table 19 : The average total tearing energy per unit distance moved by tearing force for the four leathers and two basic specimen shapes
- Appendix 1 : Analysis of variance of the maximum tearing loads
- Appendix 2 : The anlaysis of variance for the ratio of maximum tearing loads (Rg)En ligne : https://drive.google.com/file/d/1AR9VPTxOZaTS_MoSZn3YNZC9bzfXu1wK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35298
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 30-40[article]Exemplaires (1)
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Titre : The choice of experimental error in the determination of some tensile parameters of leather Type de document : texte imprimé Auteurs : R. Guy, Auteur ; A.-G. Marriott, Auteur Année de publication : 1974 Article en page(s) : p. 145-146 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques
Essais dynamiques
Protocole d'étudeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Elsewhere we have described the measurement of tensile parameters of various leathers by a number of experimental procedures. The object of the work being firstly to determine whether the procedures affect the absolute values of the tensile parameters and secondly to determine the reproducibility of the test methods. En ligne : https://drive.google.com/file/d/1eN4ASVyQBjbvecV6pa-r4ohU8eVhIJG9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33169
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58, N° 1 (11-12/1974) . - p. 145-146[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007099 - Périodique Bibliothèque principale Documentaires Disponible
Titre : The choice of experimental error in the determination of some tensile parameters of leather Type de document : texte imprimé Auteurs : R. Guy, Auteur ; A.-G. Marriott, Auteur Année de publication : 1974 Article en page(s) : p. 145-146 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques
Essais dynamiques
Protocole d'étudeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Elsewhere we have described the measurement of tensile parameters of various leathers by a number of experimental procedures. The object of the work being firstly to determine whether the procedures affect the absolute values of the tensile parameters and secondly to determine the reproducibility of the test methods. En ligne : https://drive.google.com/file/d/1eN4ASVyQBjbvecV6pa-r4ohU8eVhIJG9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40682
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 145-146[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008594 - Périodique Archives Documentaires Exclu du prêt
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
MesureIndex. 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 specimensEn ligne : https://drive.google.com/file/d/1icIjo9ND6eAPJxvpgb3cj4sRjkzFYeT1/view?usp=drive [...] Format de la ressource électronique : 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[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007099 - Périodique Bibliothèque principale Documentaires Disponible
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
MesureIndex. 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 specimensEn ligne : https://drive.google.com/file/d/1icIjo9ND6eAPJxvpgb3cj4sRjkzFYeT1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40681
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 137-144[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008594 - Périodique Archives Documentaires Exclu du prêt
