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Midterm1

# Midterm1 - MAE 131A MIDTERM#1 UCSD 12:30 pm ~ 1:50 pm One(2...

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Unformatted text preview: MAE 131A: MIDTERM #1 UCSD, April 27, 2010, 12:30 pm ~ 1:50 pm - One (2 sided) page of notes allowed - Problem 1. A structural assembly in Fig. 1 consists of a vertical (composite steelfbrass) bar CD, and a horizontal rigid member AB. Determine the ratio of the cross-sectional area of steel and brass As/Ab so that the elongations of parts GB and 8]) are equal. Given: Eu, 2 105 GPa, E; = 210 GPa, and b = 1.5a. Problem 2. Two steel shafts with shear modulus G’ are connected by gears and subjected to a torque T, as shown in Fig. 2. Determine: (a) the angle of rotation in degrees at D; (b) the maximum shearing stress in each shaft. Given: d] : dab/3 = 40 mm, L2 : 1.5L1 = 1.5 In, r3 = 1.511;: 150 mm, T = 400 N-m, and G = 80 GPa. QA‘ {\‘tv ii := 075— : 3:5. £13 26 _£ E5145, EBAS Ag ES 075 am (Hf As 7. H33 ...
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Midterm1 - MAE 131A MIDTERM#1 UCSD 12:30 pm ~ 1:50 pm One(2...

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