@inproceedings{43f4108801d94afa9fd7783f59ad0753,
title = "The influence of a hydrided layer on the fracture of Zircaloy-4 cladding tubes",
abstract = "During operation of nuclear power reactors, irradiated Zircaloy{\texttrademark}-4 cladding tubes contain circumferentially oriented hydrides concentrated in a layer near the outer surface of the cladding. This study has investigated the effect of such a hydride layer or {"}rim{"} located near the outer surface of the cladding tube on the failure of unirradiated Zircaloy-4 cladding tubes. Utilizing plane-strain ring-stretch tests with the maximum principal stress along the circumferential or hoop direction, we examined the influence of a hydride rim on the failure of Zircaloy-4 cladding at both room temperature and 300°C. Fracture is found to be sensitive to hydride-rim thickness such that cladding tubes with a hydride-rim thickness >140 μm (≈700 wtppm total hydrogen) exhibit brittle behavior, while cladding tubes with a rim thickness <90 μm (≈600 wtppm) remain ductile. The mechanism of failure is identified as strain-induced sequence of microcrack initiation within the hydride rim, linkage of microcracks to form a long (surface) crack, and subsequent failure of the cladding wall due to either a shear instability or ductile crack growth.",
author = "Daum, {Robert S.} and Bates, {Dowlas W.} and Koss, {Donald A.} and Motta, {Arthur T.}",
year = "2003",
language = "English (US)",
isbn = "0873395018",
series = "Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Proc. of the International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions",
pages = "249--258",
editor = "N.R. Moody and A.W. Thompson and R.E. Ricker and G.S. Was and R.H. Jones",
booktitle = "Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions - Proc. of the International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions",
note = "International Conference on Hydrogen Effects on Material Behaviour and Corrosion Deformation Interactions ; Conference date: 22-09-2002 Through 26-09-2002",
}