This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ... edge of the main seam is inaccessible; but the joint is stronger than the lap-form in tension and shearing and the strap makes it stiffer against bending. The strap, when below the water-line in a boiler, prevents in a lap-joint the action known as "furrowing," i. e., the corrosion in grooves of the ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ... edge of the main seam is inaccessible; but the joint is stronger than the lap-form in tension and shearing and the strap makes it stiffer against bending. The strap, when below the water-line in a boiler, prevents in a lap-joint the action known as "furrowing," i. e., the corrosion in grooves of the plate-metal near the joint. 13. Group Riveting, Fig. 67.--This form of joint is applicable daily in structural work for splicing narrow plates, etc. The stresses in the net section of plate decrease from Row No. II. onward and, in a lap-joint, efficiencies varying with the number of rows and ranging from 80 per cent. upward are obtained. The rivets are disposed in groups according to an arithmetical series, the number in the rows being: 1, 2, 1; or, 1, 2, 3, 2, 1; or, 1, 2, 3, 4, 3, 2, 1, etc. 42. The Theoretical Strength of Riveted Joints. The riveted joint is a structure whose character and methods of manufacture forbid extreme refinement of design. The plates are not only exposed in various parts to direct tension, compression, and shear, and the rivets to the latter two stresses in addition to their initial tension; but there is also, in service, bending action on the rivets and on the plates or straps. Even on the assumption of perfect workmanship throughout, the relation of the various stresses, with regard to any element of the joint, is so complex that a fair approach to the value of the resultant stress could be obtained only by intricate calculation. Again, assuming such a calculation as possible in practical design, its results would be affected materially by the process of manufacture of the joint, which process is essentially of such a nature as to exclude the accurate fitting and alignment which are required for the...
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