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Unformatted text preview: wires gradually show wear and breaks; such ropes should be retired. Periodic in-spections prevent fatigue failures by parting of the rope. 17-30 Since this is a design task, a decision set is useful. A priori decisions Function: load, height, acceleration, velocity, life goal Design Factor: n d Material: IPS, PS, MPS or other Rope: Lay, number of strands, number of wires per strand Decision variables: Nominal wire size: d Number of load-supporting wires: m From experience with Prob. 17-29, a 1-in diameter rope is not likely to have much of a life, so approach the problem with the d and m decisions open. Function : 5000 lbf load, 90 foot lift, acceleration = 4 ft/s 2 , velocity = 2 ft/s, life goal = 10 5 cycles Design Factor : n d = 2 Material : IPS Rope : Regular lay, 1-in plow-steel 6 19 hoisting...
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This note was uploaded on 12/13/2011 for the course EML 3013 taught by Professor Shingley during the Fall '11 term at UNF.
- Fall '11
- Mechanical Engineering