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Question: a motor weighing 600 lb is supported using two 14...

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A motor weighing 600 lb is supported using two 1/4 inch thick steel plates 12 inches long and 3 inches wide. Failure is a concern so a high strength AISI 4340 steel (Sut = 170 ksi, E= 30x10^6 psi) has been chosen which was oil quenched and tempered @ 1000°F. Each plate is welded to a fixed wall as shown. During use, the motor has been observed to vibrate vertically. Vibration measurements indicate an additional vertical displacement of -0.020 inches for the motor. Assuming no concentration for the plate material near the welds, determine the factor of safety. The motor center of mass is 10 inches from the wall.

weld weld motor

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