Abstract
The stress fields of expanding (precipitation) and contracting (dissolution) hydride plates were computed by finite element method using Zr-H solid solution and hydride properties at 25, 200 and 400 degrees C for fully and semi-constrained hydride plates. For the first time simultaneous hydride expansion and matrix contraction and vice-versa have been considered in a simulation of hydride precipitation and dissolution, respectively. It was observed that a fully constrained expanding hydride plate exerts a tensile stress field in the matrix close to the edge of the hydride plate while a partially contracting hydride plate exerts a tensile stress field in the hydride plate as well as a large compressive stress in the surrounding matrix close to the edge of the hydride plate. It is suggested that a compressive stress component in the matrix acting normal to a partially shrinking hydride plate could possibly explain an enhanced resistance to hydride embrittlement of Zr-alloy at elevated temperature. (C) 2013 Elsevier B.V. All rights reserved.
Original language | English |
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Pages (from-to) | 157-163 |
Number of pages | 6 |
Journal | Materials Science & Engineering: A |
Volume | 579 |
DOIs | |
Publication status | Published - 2013 |
Subject classification (UKÄ)
- Mechanical Engineering
Free keywords
- Zr-alloy
- Hydride embrittlement
- Fracture toughness
- Stress-field
- Fully
- constrained