Biaxial strains were measured at the roots of single notches in zirconium alloy specimens under loading and creep conditions (up to 1200 hours) at 250°C. A laser-based interferometric technique was used; details of the measurement procedures are given in another paper. Here, the Bodner model is incorporated into the ABAQUS finite element code and used to predict the biaxial strains at the notch root during loading and for a creep duration of 100 hours. The strains during loading agree quite well with the measured ones while the predicted creep strains are smaller. This discrepancy is attributed to the lack of precision in determining the constants for the Bodner model from smooth-specimen tests. Both the measurement technique and the Bodner model are well-suited for studies of notch response.

Issue Section:
Research Papers
Topics:
Creep, Modeling, Finite element analysis, Interferometry, Lasers, Zirconium alloys
1.
Bammann, D. and Krieg, R. D., 1987, “Summary and Critique,” Unified Constitutive Equations for Creep and Plasticity, Elsevier Applied Science, pp. 303–337.
2.
Chan
K. S.
,
Lindholm
U. S.
,
Bodner
S. B.
, and
Walker
K. P.
,
1989
, “
High Temperature Inelastic Deformation under Uniaxial Loading: Theory and Experiment
,”
ASME JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY
, Vol.
111
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345
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353
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3.
Chan, K. S., Lindholm, U. S., and Bodner, S. B., 1988, “Constitutive Modeling for Isotropic Materials,” NASA CR-182132.
4.
Cook, W. H., Rajendran, A. M., and Grove, D. J., 1992, “An Efficient Numerical Implementation of the Bodner-Partom Model in the EPIC-2 Code,” Engineering Fracture Mechanics, pp. 607–623.
5.
Scarth, D. A., Nadeau, E., and Sauve, R. G., 1990, “Assessment of the Structural Integrity of CANDU Zr-Nb Pressure Tubes for the Fuel Channel Spacer Repositioning Operation,” Proceedings of the 1990 ASME Pressure Vessels and Piping Conference, Vol. 192, pp. 75–83.
6.
Sharpe
W. N.
,
Yang
C. H.
, and
Tregoning
R. L.
,
1992
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An Evaluation of the Neuber and Glinka Relations for Monotonic Loading
,”
ASME Journal of Applied Mechanics
, Vol.
59
, pp.
S50–S56
S50–S56
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7.
Sharpe
W. N.
, and
Zeng
H.
,
1991
, “
Creep-Strain Measurements at Notch Roots in Zirconium Pressure-Tube Material
,”
Materials Evaluation
, Vol.
49
, pp.
1303
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1307
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8.
Tanaka, G., 1983, “A Unified Numerical Method for Integrating Stiff Time-Dependent Constitutive Equations for Elastic/Viscoplastic Deformation of Metals and Alloys,” Ph.D. Dissertation, Department of Materials Science and Engineering, Stanford University.
9.
Zeng
H.
, and
Sharpe
W. N.
,
1996
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A System for Measuring Biaxial Creep Strains over Short Gage Lengths
,”
Experimental Mechanics
, Vol.
36
, pp.
84
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91
.
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