01-02ChapGere.0011 - the pin is to be maintained? b a P P...

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42 CHAPTER 1 Tension, Compression, and Shear Solution 1.7-8 Pin connection for a ship’s spar Spar: d 2 5 80mm d 1 5 70mm Pin: d 5 25mm Plates: t 5 12mm A LLOWABLE LOAD P BASED UPON COMPRESSION IN THE SPAR s c 5 70 MPa 5 1178.1mm 2 P 1 5 s c A c 5 (70 MPa)(1178.1mm 2 ) 5 82.5kN A c 5 p 4 ( d 2 2 2 d 1 2 ) 5 p 4 [(80 mm) 2 2 (70 mm) 2 ] Plate Spar P Pin A LLOWABLE LOAD P BASED UPON SHEAR IN THE PIN ( DOUBLE SHEAR ) t allow 5 45 MPa P 2 5 t allow A s 5 (45 MPa)(981.7mm 2 ) 5 44.2 kN A LLOWABLE LOAD P BASED UPON BEARING s b 5 110 MPa A b 5 2 dt 5 2(25mm)(12mm) 5 600mm 2 P 3 5 s b A b 5 (110MPa)(600mm 2 ) 5 66.0kN A LLOWABLE COMPRESSIVE LOAD IN THE SPAR Shear in the pin governs. P allow 5 44.2kN A s 5 2 ¢ p d 2 4 5 p 2 (25 mm) 2 5 981.7 mm 2 Problem 1.7-9 What is the maximum possible value of the clamping force C in the jaws of the pliers shown in the figure if a 5 3.75 in., b 5 1.60 in., and the ultimate shear stress in the 0.20-in. diameter pin is 50 ksi? What is the maximum permissible value of the applied load P if a factor of safety of 3.0 with respect to failure of
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Unformatted text preview: the pin is to be maintained? b a P P Pin Problem 1.7-8 A ships spar is attached at the base of a mast by a pin connection (see figure). The spar is a steel tube of outer diameter d 2 5 80 mm and inner diameter d 1 5 70 mm. The steel pin has diameter d 5 25 mm, and the two plates connecting the spar to the pin have thickness t 5 12 mm. The allowable stresses are as follows: compressive stress in the spar, 70 MPa; shear stress in the pin, 45 MPa; and bearing stress between the pin and the connecting plates, 110 MPa. Determine the allowable compressive force P allow in the spar. Mast Connecting plate Spar P Pin A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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This note was uploaded on 09/20/2009 for the course COE 3001 taught by Professor Armanios during the Spring '08 term at Georgia Institute of Technology.

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