01-02ChapGere.0007

# 01-02ChapGere.0007 - 5 4 F ¢ d 2 ≤ 5 2 Fd A LLOWABLE...

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Problem 1.7-3 A tie-down on the deck of a sailboat consists of a bent bar bolted at both ends, as shown in the figure. The diameter d B of the bar is 1 / 4 in., the diameter d W of the washers is 7 / 8 in., and the thickness t of the fiberglass deck is 3 / 8 in. If the allowable shear stress in the fiberglass is 300 psi, and the allowable bearing pressure between the washer and the fiberglass is 550 psi, what is the allowable load P allow on the tie-down? 38 CHAPTER 1 Tension, Compression, and Shear Problem 1.7-2 A torque T 0 is transmitted between two flanged shafts by means of four 20-mm bolts (see figure). The diameter of the bolt circle is d 5 150 mm. If the allowable shear stress in the bolts is 90 MPa, what is the maximum permissible torque? (Disregard friction between the flanges.) d T 0 T 0 Solution 1.7-2 Shafts with flanges T 0 5 torque transmitted by bolts d B 5 bolt diameter 5 20mm d 5 diameter of bolt circle 5 150 mm t allow 5 90 MPa F 5 shear force in one bolt T
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Unformatted text preview: 5 4 F ¢ d 2 ≤ 5 2 Fd A LLOWABLE SHEAR FORCE IN ONE BOLT M AXIMUM TORQUE T 5 2 Fd 5 2(28.27kN)(150mm) 5 8.48kN ? m 5 28.27 kN F 5 t allow A bolt 5 (90 MPa) ¢ p 4 ≤ (20 mm) 2 d F F F F t P d B d B d W d W Solution 1.7-3 Bolts through fiberglass A LLOWABLE LOAD BASED UPON SHEAR STRESS IN FIBERGLASS t allow 5 300psi Shear area A s 5 p d W t 5 (300 psi)( p ) ¢ 7 8 in. ≤¢ 3 8 in. ≤ P 1 2 5 t allow A s 5 t allow ( p d W t ) P 1 5 619 lb A LLOWABLE LOAD BASED UPON BEARING PRESSURE s b 5 550psi Bearing area A LLOWABLE LOAD Bearing pressure governs. P allow 5 607lb P 2 5 607 lb 5 303.7 lb B¢ 7 8 in. ≤ 2 2 ¢ 1 4 in. ≤ 2 R P 2 2 5 s b A b 5 (550 psi) ¢ p 4 ≤ A b 5 p 4 ( d W 2 2 d B 2 ) P 1 2 5 309.3 lb t d B d W P 2 Fiberglass t 5 3 8 in. d W 5 7 8 in. d B 5 1 4 in. 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 Tech.

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