. The strength of materials; a text-book for engineers and architects. = 8-93 = say 9. Bearing strength of each rivet = 10 x 1 x IJ = 12*5 tons. Number of rivets required for bearing = ^^.r ^ ^^y ^• 9 rivets would thus be ample as regards bearing. The joint would then be arranged as shown in Fig. 51, thecentre two rows being chain-riveted. We will now consider the strength of this joint under variousways of failure. If the plate tears along the line A a, the force necessary toreach the safe limit of stress is, as we have shown above,70 tons. Now suppose that the plate tore along B b, she
. The strength of materials; a text-book for engineers and architects. = 8-93 = say 9. Bearing strength of each rivet = 10 x 1 x IJ = 12*5 tons. Number of rivets required for bearing = ^^.r ^ ^^y ^• 9 rivets would thus be ample as regards bearing. The joint would then be arranged as shown in Fig. 51, thecentre two rows being chain-riveted. We will now consider the strength of this joint under variousways of failure. If the plate tears along the line A a, the force necessary toreach the safe limit of stress is, as we have shown above,70 tons. Now suppose that the plate tore along B b, shearing off the rivet in A A. 5Then strength of line bb = 7(9-2)= 6125 tons Strength of one rivet = 7*85 tons. RIVETED JOINTS; THIN PIPES 109 . •. Total strength against failure along b b = 61-25 + 7-85 = 69-1 tons. Now suppose plate tore along c c, shearing off the threerivets. 5 Then strength of line cc = 7(9 — 3). = 52-5 tons. Strength of three rivets = 2355, . •. Total strength against failure along c c = 52-5 + 23-55 = 76-05 tons. D C B /^ Rit/eis I Diam. -1 1—u J—u tT^ J L irf;d Cover P/oTo. L- 3 Fig. 51. Finally, suppose cover plates tore along d d, then strength 7 = 7(9 - 3).2. 73-5 tons. From the above we see that the weakest section is along B B. mi nn p • • ^ Least strength of loint Inen emciency 01 lomt = c^, .i—r.^—,• v \ Ibtrength of sohd plate 691 69-1 9 X li X 7 78-8 878%. llu THE STRENGTH OF MATERIALS If instead of zig-zag riveting we had adopted chain riveting with three rows of three rivets (9 in aU) the least strength would be (9 - 3) IJ x 7 = o2o tons. 52 efficiencv of joint = _ , = 667 ^o- If we had four rows of chain riveting with two rivets ineach row (8 in all), the least strength would be (9 — 2)1 JX 7 = 6T2o tons. .•. efficiencv of joint = ^^^ = 77*7 ^o- too The above shows that the zig-zag riveting is considerablymore efficient than the chain riveting, and is therefore moreeconomical. (2) Design a douhle-rivefed lap joint
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