Case study for machine and design class, engineering homework help

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CASE STUDY 3 The intent of this assignment is to exercise the ability of the student's resourcefulness. Do your own work! Solutions should be typed and professionally presented. The professor will provide no assistance. 1. Chapter 9 WELDS The bracket shown below supports a total load of 60 kN. Using a safety factor of 4 and an E60 series welding rod, what size weld should be specified? 60 KN 100 mm 75 mm TOED Note: Each plate has two 75 mm welds and one 100 mm weld. 2. Chapter 11 BEARINGS A No. 208 radial-contact ball bearing supports a shaft that rotates at 1200 rpm. A radial load varies in such a way that 50, 30 and 20 percent of the time the load is 2, 5, and 8 kN, respectively. The loads are uniform so that the load application factor (Table 11-5) is 1. Estimate the L life and the median bearing life. * A No. 208 bearing is a single row 02 series with a 40 mm bore. 4) Required Textbook(s): Budynas, Richard G. and Nisbett, Keith, Shigley's Mechanical Engineering Design, 10 h Edition, McGraw Hill 2015 ISBN: 0073398209 Ontional Reforoncog. None
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Machine and design class
Problem 1.
The bracket shown below supports a total load of 60kN. Using a safety factor of 4 and an E60
series welding rod, what size weld should be specified?

Note: Each plate has two 75mm welds and 100mm weld
Solution:
B

A
𝑥̅

d=100mm
C

D
b=75mm

Calculate the center of gravity of the weld segment.
𝑥̅ =

𝑥̅ =

𝑏2
2𝑏 + 𝑑

75𝑚𝑚2
2(75𝑚𝑚) + 100𝑚𝑚
𝑥̅ = 22.5𝑚𝑚
𝑦̅ =

𝑑
= 50𝑚𝑚
2

Unit Second Polar Moment of Area
𝐽𝑢 =
𝐽𝑢 =

8𝑏 3 + 6𝑏𝑑2 + 𝑑 3
𝑏4

12
2𝑏 + 𝑑

8(75𝑚𝑚)3 + 6(75𝑚𝑚)(100𝑚𝑚)2 + (100𝑚𝑚)3
(75𝑚𝑚)4

12
2(75𝑚𝑚) + (100𝑚𝑚)
𝐽𝑢 = 613020.83 𝑚𝑚4

The area is,
𝐴 = 𝑡(2𝑏 + 𝑑)
𝐴 = 𝑡(2 ∗ 75𝑚𝑚 + 100𝑚𝑚)
𝐴 = 250𝑡 [𝑚𝑚]

Torsion for the total weld is,
�...


Anonymous
Just what I was looking for! Super helpful.

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