Technical information

4-12
stress measurements compared to the strain readings. During pass #5,000 the maximum
relative difference in the peak stress readings with respect to the average reading at the
peak is 10.6% (for pressure gauges 1178 and 1185). Similarly, the maximum relative
difference in the peak strain readings with respect to their average at the peak is 35.0%
(for strain gauges G5 and G7). During pass #80,000 the corresponding differences are
10.8% (again, pressure gauges 1178 and 1185) and 44.7% (strain gauges G6 and G8).
These differences are believed to represent both structural heterogeneity (see also
Figures 3.5.6 to 3.5.18) and slight dissimilarity in gauge installation conditions.
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
20
-70 -60 -50 -40 -30 -20 -10 0
Offset [in.]
Strain in X (x=5", x=0) [
μ
strains]
Computed Response
G1_measured
G3_measured
-560
-480
-400
-320
-240
-160
-80
0
80
160
-70-60-50-40-30-20-10 0
Offset [in.]
Strain in Y (z=5", x=0) [
μ
strains]
Computed Response
G2_measured
G4_measured
-30
0
30
60
90
120
150
180
-70 -60 -50 -40 -30 -20 -10 0
Offset [in.]
Strain in X (z=5", x=24") [
μ
strains]
Computed Response
G6_measured
G8_measured
-120
-100
-80
-60
-40
-20
0
20
40
-70-60-50-40-30-20-10 0
Offset [in.]
Strain in Y (z=5", x=24") [
μ
strains]
Computed Response
G5_measured
G7_measured
-10
-5
0
5
10
15
20
25
30
35
40
-70 -60 -50 -40 -30 -20 -10 0
Offset [in.]
Stress in Z (z=5", x=0) [psi]
Computed Response
1178_measured
1185_measured
-3
0
3
6
9
12
15
18
21
-70 -60 -50 -40 -30 -20 -10 0
Offset [in.]
Stress in Z (z=11", x=0) [psi]
Computed Response
1179_measured
1184_measured
Figure 4.2.3: Resilient responses during APT pass #80,000. Both measured (solid
markers) and model generated (solid line) are shown.
Next, the goodness of fit of the calibrated model can be visualized. It may be
graphically seen that the isotropic LET captures relatively well the horizontal strains in