Page 171 - Handbook of Materials Failure Analysis
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3 Experiment on Ring Specimens 167
2100 Specimen No: 2_05
1800
1500
Load (N) 1200 Exp.
900
FE analysis
600
300
0
0.0 0.6 1.2 1.8
Displacement (mm)
FIGURE 7.4
Comparison of load-displacement response as obtained from FE analysis with that of
experiment for a ring-tension specimen.
conventionalmethod, the load-displacement data isconverted to the engineeringstress-
straindatabyusingtheinformation,suchas,theinitialareaandgauge-lengthofthespec-
imen. However, for this ring-tension test, the gauge-length is not known apriori and it
hasbeenobtainedfromtheshapeoftheneckedregionofthespecimenobtainedafterthe
800
700
True stress (MPa) 600
500 Experiment
FEM
400
0.00 0.02 0.04 0.06 0.08
True plastic strain
FIGURE 7.5
True stress-strain curve of the material Zircaloy-4 at room temperature as obtained from
inverse FE analysis of the ring-tension setup and its comparison with data directly obtained
from experiment.
