Mechanical property testing of irradiated zircaloy cladding under reactor transient conditions. Page: 4 of 16
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8X R1.020
1.020
1.270O
.
O
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I-0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2= 0.50 0.560
0.710
4. 6.020 9.500
10.900
(a)-4 -3 -2 -1 0 1 2 3 4
Gauge Length Position (mm)
(b)Figure 1: (a) a schematic diagram of uniaxial RST specimen with an array of
microhardness indents (dimensions in mm; not to scale) and (b) measured strain
distribution at specimen fracture as determined from indent-to-indent spacing
entire gauge shows a uniform strain of approximately 5 1%, as shown by the regions of
constant strain. The large strain peak at a position of -1.25 mm shows the development
of localized necking near the fracture surface. Therefore, compared to specimens with
short gauge lengths that neck soon after yielding, this specimen design is better suited for
determining the constitutive stress-strain properties.
The data in Figure 1(b) shows that specimen necking and fracture occur near the
end of the gauge section (defined by the fillet); as will be discussed later in this paper,
this failure occurs because of stress concentration, material anisotropy, and friction. FEA
[9] indicates that the uniaxial RST and flat sheet uniaxial specimens behave similarly in
the absence of friction. In both flat and RST specimens subjected to a uniaxial state of
stress, failure is localized near the fillet.
Unlike the failure of irradiated cladding during an RIA event in which the fracture
path is through the cladding thickness, the fracture of the uniaxial RST specimen occursRoom Temperature
Uniaxial RST Specimen
STRAIN %
Uniform 5
Fracture 52
Gauge Length
- Fillet-to-Fillet
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Daum, R. S.; Majumdar, S.; Tsai, H.; Bray, T. S.; Billone, M. C.; Koss, D. A. et al. Mechanical property testing of irradiated zircaloy cladding under reactor transient conditions., article, October 2, 2001; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc735800/m1/4/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.