01-02ChapGere.0009

01-02ChapGere.0009 - 5 n 5 2.5 s allow 5 s Y n 5 140 MPa...

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40 CHAPTER 1 Tension, Compression, and Shear Problem 1.7-6 A long steel wire hanging from a balloon car- ries a weight W at its lower end (see figure). The 4-mm diameter wire is 25 m long. What is the maximum weight W max that can safely be car- ried if the tensile yield stress for the wire is s Y 5 350 MPa and a margin of safety against yielding of 1.5 is desired? (Include the weight of the wire in the calculations.) L d W Solution 1.7-6 Wire hanging from a balloon d 5 4.0 mm L 5 25 m s Y 5 350 MPa Margin of safety 5 1.5 Factor of safety
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Unformatted text preview: 5 n 5 2.5 s allow 5 s Y n 5 140 MPa Total load P 5 W max 1 W 5 ± allow A W max 5 1740 N 5 1759.3 N 2 24.2 N 5 1735.1 N 5 (140 MPa) ¢ p 4 ≤ (4.0 mm) 2 2 24.19 N 5 (140 MPa) ¢ p d 2 4 ≤ 2 24.19 N W max 5 s allow A 2 W 5 24.19 N W 5 (77.0 kN / m 3 ) ¢ p 4 ≤ (4.0 mm) 2 (25 m) L d W Weight density of steel: g 5 77.0 kN/m 3 Weight of wire: W 5 g AL 5 g ¢ p d 2 4 ≤ ( L ) 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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