Plantation Rubber and the Testing of Rubber

Plantation Rubber and the Testing of Rubber

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...original thickness. Van Heurn 3 has recently made some measurements on compression covering the same portion of the stress-strain curve to which Boileau's figures refer. The stress-strain curves which he obtains are not hyperbolic, but are similar in character to the curve corresponding to Boileau's figures. Hysteresis loops.--Van Heurn gives the stress-strain curve corresponding to unloading after compression. It will be noticed 1 In these tests only five loads were applied, viz. 2000, 2500, 4000, 5500 and 7000 kg. 'Lects. on Rubber, 1908, p. 300. 3 Meded. Delft, 1916, p. 429. (Fig. 13) that not only does the stress-strain curve on compression--at all events up to a compression of 30-40 per cent.--present, as already remarked, a general aspect during the loading phase similar to the general aspect of the well-known stressstrain curve for extension, but that it forms, with unloading, a hysteresis loop reminiscent of the hysteresis loop corresponding to extension and subsequent retraction (vide Chap. XVIII). Van Heum's tests were made on three cylinders, of somewhat mineralized rubber, the composition and vulcanization conditions of which are in two of the cases recorded. The cylinders had Load (kgs.j Fig. 13.1--Hysteresis loops on compression. a length of 72 mm. and a diameter of 29 mm. The tests were conducted on a Breuil dynamometer. Two of the autographic records are shown in Fig. 13. Torsional Measurements Mallock2 measured the rigidity or torsion modulus under no-load of the three samples of rubber mentioned on p. 227. The pieces of rubber, which were of approximately square crosssection and 11-2 in. in length, were arranged vertically, so that the lower end was held fixed, while to the upper end a horizontal 1 The limit of more

Product details

  • Paperback | 202 pages
  • 189 x 246 x 11mm | 372g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236613759
  • 9781236613752