Problem 3 (P 3-26) 26. A polar exploration team based near the south pole is faced with an emergency in which a very imp

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Problem 3 P 3 26 26 A Polar Exploration Team Based Near The South Pole Is Faced With An Emergency In Which A Very Imp 1 (121.36 KiB) Viewed 49 times

Problem 3 (P 3-26) 26. A polar exploration team based near the south pole is faced with an emergency in which a very important "housing and supplies" module must be lifted by a special crane, swung across a deep glacial crevasse, and set down in a safe location on the stable side of the crevasse. The only means of supporting the 100,000 lb module during the emergency move is a 12-ft-long piece of steel with cross section of 1.5 inches thick by 10 inches deep with two small holes, each one-eighth inch in diameter, located at midspan 1 inch from upper and lower edges, as shown in Figure Q3.26. These holes were drilled for some earlier use, and careful inspection has shown a tiny through-the-thickness crack, approximately 0.060 inch long, emanating vertically from each hole, as shown. The support member may be modeled for this application as a 12-ft-long simply supported beam which supports the module loading symmetrically at two points, located 4 ft from each end, as shown. The material is known to be D6AC steel (1000 F temper). Ambient temperature is about -65°F. Enlarged view Crack length 0.060" 1.0" 50,000 lb 50,000 lb 1" D. hole 8 -4- 10" R -6- RR 1.5"-2/ -12 1" D. hole 8 Enlarged view 1.0" Crack length 0.060" Figure Q3.26 If the beam is to be used only once for this purpose, would you approve its use? Support your answer with dearly explained calculations based on the most accurate techniques that you know.