EBK FUNDAMENTALS OF MATERIALS SCIENCE A
5th Edition
ISBN: 9781119175506
Author: RETHWISCH
Publisher: JOHN WILEY+SONS INC.
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Question
Chapter 3.21, Problem 20QP
To determine
The atomic radius of magnesium.
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Question 2
The following strains are obtained by a 0-60-120 strain rosette: ε0 = 300 x 10-6, 60 =
200 x 10-6 and 120= 150 x 10-6.
i.
Determine strains Ex, Ey and Yxy
ii.
Determine the strains for 0 = 40°
iii.
Calculate principal strains, maximum shear strain and the orientation of
principal strains
iv.
Determine normal stresses (σx, σy) and shear stress (Txy), if E = 200kPa
and v = 0.25.
(Hint: You may use stress-strain relationship for plane strain,
summarised in matric format as follows:
E
σχ
бу
1-v
v
0
Ex
=
v
1-v
0
Ey
txy. (1+v)(1 − 2v) 0
0
0.5 v
A machine having class B insulation attains
a temperature of 208°C (by resistance) in a
torrid ambient temperature of 180°C.
a. What is the temperature rise?
b. Is the machine running too hot and, if so,
by how much?
1 Name the losses in a dc motor.
2 What causes iron losses and how can they be
reduced?
-3 Explain why the temperature of a machine
increases as the load increases.
Chapter 3 Solutions
EBK FUNDAMENTALS OF MATERIALS SCIENCE A
Ch. 3.21 - Prob. 1QPCh. 3.21 - Prob. 2QPCh. 3.21 - Prob. 3QPCh. 3.21 - Prob. 4QPCh. 3.21 - Prob. 5QPCh. 3.21 - Prob. 6QPCh. 3.21 - Prob. 7QPCh. 3.21 - Prob. 8QPCh. 3.21 - Prob. 9QPCh. 3.21 - Prob. 10QP
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