Effect of radial hydrides on the axial and hoop mechanical properties of Zircaloy-4 cladding

Chu, Heng-Cheng; Wu, S.K.; Chien, K-F; Kuo, R.C.

doi:10.1016/j.jnucmat.2006.11.008

Cited by 76 publications

(28 citation statements)

References 11 publications

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“…Recent studies on hydrides using optical microscopy (OM) and electron backscatter diffraction (EBSD) technique by K.Kiran et al [8] and other researchers [27][28][29][30] concluded that δ-ZrH1.5…”

Section: Preferential Precipitation Of Hydridesmentioning

confidence: 99%

“…Hong further proposed time dependent stress-aided dissolution of circumferential hydrides and reprecipitation of radial hydrides. Chu et al [30] has considered thermal cycling as an important factor and claimed that threshold stress for hydride reorientation depends on hydrogen concentration and proposed that diffusion of hydrogen can play a major role in the reorientation process. It was made clear by these works that stress plays a major role in hydride reorientation.…”

Section: Preferential Precipitation Of Hydridesmentioning

confidence: 99%

“…Many possible explanations have been provided for the cause of this kind of behavior by hydrides. [9,[27][28][29][30]. One theory suggests that diffusion of hydrogen inside hydride upon stress causes reorientation [28].…”

Section: Study Of Orientation Of Hydridementioning

confidence: 99%

“…Szpunar et al [4] and others [27][28][29][30] have shown that hydride reorients on application of the hoop stress and this may result in zirconium tubes failure. Therefore, hydrides formation and reorientation have become a major issue in the nuclear industry and the study on hydride has gained significant importance in the nuclear research.…”

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confidence: 99%

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Molecular Dynamics Study of Zirconium and Zirconium Hydride

Siripurapu¹,

Szpunar²,

Szpunar³

2013

Pricm

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Molecular dynamics (MD) simulations were used in order to investigate structure and mechanical properties of zirconium and zirconium hydride. Calculation of temperature dependent failure of zirconium, diffusion of hydrogen in zirconium, properties of interfaces in zirconium and zirconium hydride and effect of hydrogen on crack nucleation and propagation were in good agreement with available experimental data. These are the first computer simulations where large-scale atomic/molecular massively parallel simulator (LAMMPS) code was used with the Embedded Atom Method (EAM) and Modified Embedded Atom Method (MEAM) to study structure and mechanical properties of zirconium hydrogen system (Zr-H) and zirconium hydride (ZrH2).Verification of methods was done in order to establish the best potential for zirconium and zirconium hydride. EAM and MEAM potentials successfully predicted lattice parameters, mechanical properties and variation of lattice parameters with temperature for α-Zr. MEAM potential was used to predict correctly the face centered structure for ZrH2 and also its mechanical properties.Temperature dependent stress-strain curves were calculated in order to predict yielding point for α-Zr. Results indicate early yielding and failure with increase of temperature in zirconium on application of tensile and compressive strains. Anisotropic stress variation with temperature in α-Zr was calculated.Hydrogen ingress through diffusion of hydrogen in zirconium is a mechanism responsible for formation of hydrides. Temperature-dependent hydrogen diffusion and activation energy for diffusion was calculated and the agreement with experiments was satisfactory. Anisotropy of diffusion of hydrogen is observed for Zr crystal. Hydrogen diffusion was also modeled under tensile and compressive strain and a possible formation of hydrides in the direction perpendicular to applied strain was observed.The effect of strain on orientation of hydride was investigated. Hydride {111} oriented crystal Bonds surrounding atoms and stress concentration analysis were performed using OVITO and VMD software respectively. Weaker bonds and higher stress concentrations are observed in the presence of hydrogen in zirconium. The presented results clearly demonstrate that MD simulation can be used to predict structure and processes that are important for understanding failure in Zr based nuclear materials.iv PREFACE Sections of this thesis have been submitted as a multi-authored paper in refereed conference papers. The research, data analyses and manuscript preparation were carried out by me and the co-authors contributed in editing the manuscripts for submission to refereed conference papers.

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Section: Preferential Precipitation Of Hydridesmentioning

confidence: 99%

Section: Preferential Precipitation Of Hydridesmentioning

confidence: 99%

Section: Study Of Orientation Of Hydridementioning

confidence: 99%

mentioning

confidence: 99%

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Molecular Dynamics Study of Zirconium and Zirconium Hydride

Siripurapu¹,

Szpunar²,

Szpunar³

2013

Pricm

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“…Other hydride reorientation tests using Zircaloy-4 in a cold worked or SRA state with 100 to 600ppm hydrogen levels were also performed [14,15]. The results indicated that hydride reorientation may occur due to applied stress, heat cycling (cool-down rate), and temperature factors.…”

Section: Study On Hydride Reorientation Of Cladding During Dry Storagementioning

confidence: 99%