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02-05ChapGere.0003 - 136 A-PDF Axially Loaded Purchase...

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Problem 2.6-18 A tension member is to be constructed of two pieces of plastic glued along plane pq (see figure). For purposes of cutting and gluing, the angle must be between 25° and 45°. The allowable stresses on the glued joint in tension and shear are 5.0 MPa and 3.0 MPa, respectively. (a) Determine the angle so that the bar will carry the largest load P . (Assume that the strength of the glued joint controls the design.) (b) Determine the maximum allowable load P max if the cross-sectional area of the bar is 225 mm 2 . Solution 2.6-18 Bar in tension with glued joint 136 CHAPTER 2 Axially Loaded Members q p P P 25 45 A 225 mm 2 On glued joint: allow 5.0 MPa allow 3.0 MPa A LLOWABLE STRESS x IN TENSION (1) x sin cos Since the direction of is immaterial, we can write:
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