472 HW_1

# 472 HW_1 - Using the maximum-distortion-energy criterion...

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MAE 472, Spring 2010 Homework #1 Due 1/28/10 Problem 1 You are asked to design a tension strut for an aircraft which will survive 6,000 flights (using a factor of safety of 1.6). A typical loading on the part during a single flight is given below: The S-N diagram for aluminum ### # is given below. As a first attempt you design a strut of this material with a cross-sectional area = 0.1 mm 2 . Does this meet the design criteria? 1.2 1500 MPa U m S Aluminum ####

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Problem 2 The state of plane stress shown occurs in a machine component made of a steel with y = 325 MPa.
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Unformatted text preview: Using the maximum-distortion-energy criterion, determine whether yield will occur when (a) = 200 MPa, (b) = 240 MPa, (c) = 280 MPa. For each stress level, if yield does not occur, determine the corresponding factor of safety. Problem 3 The cast-aluminum rod shown is made of an alloy for which UT = 70 Mpa and UC = 175 MPa. Knowing that the magnitude T of the applied torques is slowly increased and using the maximum normal stress criterion, determine the shearing stress that should be expected at rupture....
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472 HW_1 - Using the maximum-distortion-energy criterion...

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