Report of the Tests of Metals and Other Materials for Industrial Purposes Made with the United States Testing Machine at Watertown Arsenal, Massachusetts, During the Year Ended ...

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U.S. Government Printing Office, 1892 - Building materials
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Page 3 - June .'50, 1891, in compliance with the requirements of the act of Congress appropriating funds for the testing machine. The total number of specimens tested during the year was 3,207, of which number 390 were specimens of gun metal, 960 tests of other material for the .Ordnance Department, 352 were tests for other Government departments, 613 industrial tests, and 892 private tests.
Page 443 - The sheet number, showing from what sheet each plate came, and the number of the riveted joint test in which the plate had been previously tested, are shown on the sketch of each joint. In reports of tests for the years 1885 and 1886 will be found the drawings of the sheets and the original tests referred to.
Page 4 - ... such other purposes as the material may be intended for. This comprises the tests for quality of material used in the current; work of the Government. 3 Under the class of investigative work, tests have been continued upon internal strains in iron and steel cylinders, in forgings and in cold-rolled bars, and observations made upon the effects of annealing temperatures in relieving these strains. A large number of tests have been made upon the series of steel-rail tests in the class of railroad...
Page 242 - General summary. Tensile strength per square inch of original section Elastic limit per square inch...
Page 417 - .564. Sectional area, .25 square inch. Gauged length, 6". Elongation of inch sections: ".15, ".18, ".30, ".44*, ".22, ".17. Diameter at fracture, ".38. Area, .1134 square inch. Contraction of area, 54.6 per cent.
Page 443 - The present tests are supplementary to those of earlier reports, and occupy a place intermediate between the elementary forms of joints and the more elaborate types of joints which have been investigated. Wide variation has been given the pitches, and rivets of extreme diameters have been used for the purpose of including joints in which these features have been carried to their practical limits. In double-riveted seams chain and zigzag riveting have been cmployed, and their relative behavior ascertained...
Page 380 - Sectional area, 1 Ħsquare inch. Gauged length, 10". Elongation of inch sections: ".09, ".12, ".12, ".17, ".23. ".37* ".18, ".15, ".15, ".11. Diameter at fracture, ".92. Area, .665 square inch. Contraction of area, 33.5 per cent. Fractured at middle of stem. Appearance, granular, radiating from a silky spot at the circumference. A scries of traue verse cracks opened along the stem.
Page 4 - Much valuable information has been developed by these tests. An important feature was shown in the tests of certain rails which had been in service. It was found that a remarkable difference in toughness was displayed according to whether the rail was bent in a downward, the base being then under tension, or an upward direction, the head being under tension. The downward bends were characterized by toughness, while an upward bend would cause a brittle fracture. This behavior was very prominent in...
Page 283 - .505. Sectional area, .20 square inch. Gauged length, 2". General summary. Tensile strength per square inch of original section pounds..
Page 317 - .505. Sectional area, .20 square inch. Gauged length, 3".

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