Civil Engineering Reference
In-Depth Information
Table 8.2
Initial percent cold work specimen dimensions [
5
]
h
(mm)
Δ
l
(mm)
%CW
D
inal
(mm)
Δ
D
(mm)
Exp. verified Dia.
(mm)
9.525
0
0
6.350
0
6.350
0.925
10
6.693
0.343
6.706
8.573
1.905
20
7.100
0.750
7.163
7.620
6.668
2.858
30
7.590
1.240
7.696
3.810
40
8.198
1.848
8.230
5.715
4.763
50
8.890
2.630
8.915
4.763
8.2.3 Experimental Setup and Procedure
To truly determine the effect that cold work has on the EAF technique, three dif-
ferent experimental tests were run. Conventional compression tests were per-
formed to quantify the differences in the thermal and stress-strain profiles of the
different amounts of cold work without applying any electricity. Then, stationary
electrical tests were performed to determine the differences in the heating profiles
of specimens at a static load of 2225 N, with different levels of cold work where
no deformation was taking place. Finally, EAF compression tests were run, with
an electrical input of 800 A, to identify the differences in the thermal profiles and
stress-strain profiles of the different cold-worked specimens during deformation
and during the application of the EAF technique. Table
8.3
below shows the differ-
ent test-type/cold-worked specimen combinations performed for this work.
Table 8.3
Test-type/specimen combinations for %CW research [
5
]
Specimen type
Test type
Preload (N) Current (A)
Amount of
deformation
(mm)
Stationary electrical
2,225
354, 531
0
CW 10 % annealed, worked
CW 20 % annealed, worked
Stationary electrical
2,225
403
0
Stationary electrical
2,225
466
0
CW 30 % annealed, worked
Stationary electrical
2,225
532, 1,064
0
CW 40 % annealed, worked
CW 50 % annealed, worked
Stationary electrical
2,225,
62,300
400
0
Stationary electrical
42,275
466
0
CW 30 % annealed, worked
CW 40 % annealed, worked
Stationary electrical
50,063
532
0
Stationary electrical
62,300
625
0
CW 50 % annealed, worked
CW 20 % annealed, worked
Conv. comp.
2,225
0
4.445
CW 20 % annealed, worked
EAF comp.
2,225
806
4.445
Conv. comp.
2,225
0
2.54
CW 40 % annealed, worked
CW 40 % annealed, worked
EAF comp.
2,225
806
2.54
