EMA 4223: Problem Set # 3, 20 pt
R. Gaume
March 27, 2013
Problem 1
Work hardening strengthens an alloy by:
a) Removing internal defects in the crystal structure
b) Increasing the dislocation density
c) Decreasing the grain size of the alloy
d) Increasing

EMA 4223: Problem Set # 5, 20 pt
R. Gaume
April 15, 2013
Problem 1
After increasing the yield strength of an alloy by strain hardening, it is found that
the fracture toughness of the alloy decreased, why?
.
Problem 2
To investigate the eect of pore size o

EMA 4223: Problem Set # 4, 20 pt
R. Gaume
April 3, 2012
Problem 1
6 points
The stress in a bolt-nut assembly holding parts together can lessen over time as a
result of creep. This eect is particularly pronounced when bolts are subjected to
high temperatur

EMA 4223: Solutions to Problem Set # 1, 20 pt
R. Gaume
January 28, 2012
Problem 1
Change of coordinate system
The transformation matrix A = (aij ) from the old
1
1
0
2
2
1
1
1
3
3
3
2
1
1
6
6
6
to the new coordinates is:
From the tensor transformation

EMA 4223: Problem Set # 1, 20 pt
R. Gaume
January 21, 2012
Problem 1
Change of coordinate system
The unit base vectors xi of a new coordinate system K are:
x 2 + x3
x1 x 2 + x3
2x1 + x2 x3
, x2 =
, x3 =
,
2
3
6
The stress tensor ik in the system K is of t

EMA 4223: Problem Set # 2, 20 pt
R. Gaume
February 22, 2012
Problem 1
Consider the following body-centered cubic dislocation reaction:
a
a
a
a
[111] [ + [ + [
110]
112]
110]
2
8
4
8
a) Prove that the reaction will occur.
b) What kind of dislocations are

3/31/13
DoITPoMS - TLP Library Introduction to mechanical testing - Questions
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