SYMPOSIA PAPER Published: 28 July 2021
STP162220190043

Back-Calculated Indentation Stress-Strain Curves from Small Scale Testing and Verification Using Finite Element Models: Application to Nanoindentation and Micropillar Compression Study of a Heavy Ion Irradiated Zr-2.5Nb Alloy

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The plastic properties of nonirradiated and irradiated Zr-2.5Nb pressure tube alloys were obtained from both nanoindentation and micropillar compression tests. A back-calculation model was used to calculate the plastic properties of both nonirradiated and irradiated materials based on the nanoindentation. The calculated indentation stress-strain curves were adopted as material property inputs in finite element models of nanoindentation and micropillar compression tests. The nanoindentation models using calculated properties produced good fits to the indentation load-displacement curves; the pileup behaviors simulated were also consistent with existing theories. It was found that the displacement-controlled micropillar compression test failed by localized shear damage; the micropillar model successfully predicted the shear failure behavior, but this occurred at higher stress than observed experimentally. This test is believed to be strongly affected by irradiation, the sample size, and grain boundary strength. It can, therefore, be concluded that the orientation dependence of irradiated material plastic properties, in terms of irradiation-induced changes to work hardening, can be readily studied by nanoindentation combined with the back-calculation model.

Author Information

Wang, Qiang
Dept. of Mechanical and Materials Engineering, Queen's University, Kingston, ON, CA
Daymond, Mark, R.
Dept. of Mechanical and Materials Engineering, Queen's University, Kingston, ON, CA
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Pages: 294–318
DOI: 10.1520/STP162220190043
ISBN-EB: 978-0-8031-7691-1
ISBN-13: 978-0-8031-7690-4