ED Brittle failure is characterised by: Select one: O a. Dimples in the fracture surface O b. Little or no elongation to failure O c. A significant reduction in cross sectional area d. Cavity coalescence

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Can you answer these questions please.....

Brittle failure is characterised by:
Select one:
(3
a. Dimples in the fracture surface
O b. Little or no elongation to failure
O c. A significant reduction in cross sectional area
O d. Cavity coalescence
O e. The component breaking into few pieces
12 of 12
yield stress (MPa)
90
8 8 8
80
8 8
40
30
A
200
Select one:
O a. 252.6 MPa
O C.
O b. 310.9 MPa
80.5 MPa
d. 165.2 MPa
2
O e. 198.9 MPa
400
600
grain size d (microns)
Consider the graph below for 3 test samples A, B and C of the same metal composition which have
been cold-worked, but to different extents. If you had to sort the samples by the degree of cold-
working they have undergone, how would you rank them?
800
Stress (MPa)
O b.
600
500
The graph below shows the yield stress for a polycrystalline metal as a function of the grain size of the metal. The point A is (10 microns, 100 MPa) and B is
(1000 microns, 28 MPa). Using this data, calculate what is the closest numerical match to the yield stress at 2 microns.
400
B
300
1000
200
100
Select one:
O a.
OF
0
A<C<B
O c. A<B<C
C<B<A
O d. C<A<B
A
B
0.05
0.1
0.15 0.2
Strain
0.25
Transcribed Image Text:Brittle failure is characterised by: Select one: (3 a. Dimples in the fracture surface O b. Little or no elongation to failure O c. A significant reduction in cross sectional area O d. Cavity coalescence O e. The component breaking into few pieces 12 of 12 yield stress (MPa) 90 8 8 8 80 8 8 40 30 A 200 Select one: O a. 252.6 MPa O C. O b. 310.9 MPa 80.5 MPa d. 165.2 MPa 2 O e. 198.9 MPa 400 600 grain size d (microns) Consider the graph below for 3 test samples A, B and C of the same metal composition which have been cold-worked, but to different extents. If you had to sort the samples by the degree of cold- working they have undergone, how would you rank them? 800 Stress (MPa) O b. 600 500 The graph below shows the yield stress for a polycrystalline metal as a function of the grain size of the metal. The point A is (10 microns, 100 MPa) and B is (1000 microns, 28 MPa). Using this data, calculate what is the closest numerical match to the yield stress at 2 microns. 400 B 300 1000 200 100 Select one: O a. OF 0 A<C<B O c. A<B<C C<B<A O d. C<A<B A B 0.05 0.1 0.15 0.2 Strain 0.25
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