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Unformatted text preview: winters, high winds, and salt air. When plastic is exposed to sunlight it becomes brittle. The high wind must have gotten into the lamp and after repeated wind loads the bracket holding the top piece on broke. This allowed the top to fly off creating a trajectory and then hit the concrete patio. At this point the force of the impact with the ground cause the large failure in top, which quickly sheared because of the brittle plastic. The load that caused the crack is equal to 755.6 pounds. This happened when the shear was at its maximum, a value of 5.58 ksi. Since it failed at max the angle of failure is 45 . This also means that it failed in shear, which clearly the angle of the crack on the top piece of the lamp....
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This note was uploaded on 04/03/2008 for the course CIVE 451 taught by Professor Mullin during the Spring '08 term at Drexel.
- Spring '08