Civil Engineering Reference
In-Depth Information
Table 9.4
Stationary
electrical test temperatures
(4.76-mm- diameter surface
ground specimens) [
6
]
Force
(N)
Time
(s)
Temperature
(°C)
Δ
T (% of baseline
Temp at 1,335 N)
5
288.1
100.0
1,335
10
290.0
100.0
294.6
100.0
15
5
268.4
93.2
2,000
267.3
92.2
10
272.8
92.6
15
2,670
5
261.3
90.7
10
265.9
91.7
270.0
91.7
15
5
257.4
89.4
3,338
256.6
88.5
10
262.8
89.2
15
4,000
5
233.7
81.1
239.5
82.6
10
15
244.1
82.9
Fig. 9.14
Stationary
electrical temperatures
(4.76-mm-diameter surface
ground specimens) [
6
]. There
is a clear linear decreasing
trend for the percent of the
baseline temperature and
static load because the static
loads tested did not surpass
the elastic-plastic threshold
for these particular specimens
100
All loads in the
elastic region
.
95
90
85
After 5s
After 10s
After 15s
80
75
0
1000
2000
3000
4000
5000
Static Load (N)
on the specimens with a 320-grit surface ground roughness. Additionally, Fig.
9.14
shows this data plotted as a “percent of the baseline temperature at 1,335 N” versus
the static load after 5, 10, and 15 s of testing. The figure illustrates a clear declining
trend in the percent of the baseline temperature as the static load is increased.
Table
9.5
shows the specimen temperatures at 5-second intervals, as well as the
percent of the baseline temperature for all of the static loads run on the 4.76-mm-
diameter specimens with a “Large CA” roughness profile. Additionally, Fig.
9.15
shows this data plotted as a “percent of the baseline temperature at 1,335 N” ver-
sus the static load after 5, 10, and 15 s of testing. Unlike the previous figure, this
figure shows a very steep declining trend in the percent of the baseline temperature
with increased static load for only the first two static loads (note these two loads
were in the elastic regime). Then, there is a level relationship between the percent
of the baseline temperature and the load for the remaining three static loads. The
