05-05ChapGere.0008

05-05ChapGere.0008 - 14,990 psi s c 5 2 P A 2 M S 5 2 166...

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SECTION 5.12 Beams with Axial Loads 357 Beams with Axial Loads When solving the problems for Section 5.12, assume that the bending moments are not affected by the presence of lateral deflections. Problem 5.12-1 While drilling a hole with a brace and bit, you exert a downward force P 5 25 lb on the handle of the brace (see figure). The diameter of the crank arm is d 5 7/16 in. and its lateral offset is b 5 4-7/8 in. Determine the maximum tensile and compressive stresses s t and s c , respectively, in the crank. Solution 5.12-1 Brace and bit P = 25 lb d = 7 in. 16 b = 4 7 in. 8 P 5 25 lb (compression) M 5 Pb 5 (25 lb)(4 7/8 in.) 5 121.9 lb-in. d 5 diameter d 5 7/16 in. S 5 p d 3 32 5 0.008221 in. 3 A 5 p d 2 4 5 0.1503 in. 2 M AXIMUM STRESSES 5 2 166 psi 1 14,828 psi 5 14,660 psi 5 2
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Unformatted text preview: 14,990 psi s c 5 2 P A 2 M S 5 2 166 psi 2 14,828 psi s t 5 2 P A 1 M S 5 2 25 lb 0.1503 in. 2 1 121.9 lb-in. 0.008221 in. 3 P d M Problem 5.12-2 An aluminum pole for a street light weighs 4600 N and supports an arm that weighs 660 N (see figure). The center of gravity of the arm is 1.2 m from the axis of the pole. The outside diameter of the pole (at its base) is 225 mm and its thickness is 18 mm. Determine the maximum tensile and compressive stresses s t and s c , respectively, in the pole (at its base) due to the weights. 1.2 m 225 mm 18 mm W 1 = 4600 N W 2 = 660 N A-PDF Split DEMO : Purchase from www.A-PDF.com to remove the watermark...
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