Fracture of Zircaloy-4 Fuel Cladding Tubes with Hydride Blisters

Macdonald, Vincent; Boulch, D. Le; Ménibus, Arthur Hellouin de; Besson, Jacques; Auzoux, Quentin; Crépin, Jérôme; Jolu, Thomas Le

doi:10.1016/j.mspro.2014.06.041

Cited by 17 publications

(10 citation statements)

References 20 publications

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“…Figure compares the geometry of fractured blister results and experiments are compared. The case σ Y / σ s = 0.3, which is close to the expected conditions at the experiment, cf Macdonald et al The growth rate is not known at the experiment and therefor the absolute growth rate is not studied. Instead the results are compared at equal radius at the surface R s .…”

Section: Resultsmentioning

confidence: 99%

“…Indications of radial cracks are marked by inserted black arrows. B, A cut through the centre of a similar blister with a visible edge crack from the top of the blister . Three regions are identified: I—solid hydride, II—hydride platelets preceding the advancing hydride front, and III—platelets present already before the experiment .…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1A,B shows 2 blisters. 19,20 Present in regions I to III in Figure 1B are (I) the blister core of presumably pure hydride, (II) small plates of hydride, so-called hydride platelets formed as a precursor of the approaching hydride front, and (III) hydride platelets present in original the matrix material. In region II, the platelets are aligned towards the blister centre.…”

Section: Introductionmentioning

confidence: 99%

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Self‐inflicted fracture of expanding surface precipitates

Reheman

Ståhle

2018

Fatigue Fract Eng Mat Struct

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This work concerns spontaneous fracture of growing brittle precipitates in an elastic plastic matrix. The mass of the precipitate is increasing as more transformed matrix material is added to it. Under stress‐free conditions, the new phase occupies a larger volume than the original matrix material. Just outside the expanding precipitate, the matrix undergoes stretching beyond the elastic limit. The influence of the elastic plastic material behaviour is studied. A phase field model that keeps track of the phase composition is used. Both cases with a crack and without a crack are included. The growth histories from microscopic to macroscopic precipitate sizes are followed. Growth of the precipitate is very slow and quasi‐static mechanical equilibrium is assumed at all time. The result is compared with observations of hydride blisters that are formed on surfaces of zirconium alloys. The numerical model is qualified against a derived exact solution for a cylindrical precipitate without a crack. The numerical result predicts a position of the growing crack that is confirmed by the observations. Also, the predicted length of the crack is in fair agreement with the experimental observations. The depth of the blister is slightly larger than what is found at the experiments. Also, it is found that the incorporated transformed phase rejects the compression, which creates an increasing tensile stress in the inner part of the precipitate.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self‐inflicted fracture of expanding surface precipitates

Reheman

Ståhle

2018

Fatigue Fract Eng Mat Struct

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“…). A detailed Finite Element analysis where the clad section and the half cylinder inserts are considered can nevertheless provide realistic estimate of the plastic strains [11,14]. The simulation of test 2468 has therefore been undertaken and shows that the stress state is far from being homogeneous in the clad thickness and width and depends greatly on the exact position of the blister (Fig.…”

Section: Materials Properties For the Cladding And The Hydride Blistermentioning

confidence: 99%

2D simulation of hydride blister cracking during a RIA transient with the fuel code ALCYONE

Sercombe

Helfer

Federici

et al. 2016

EPJ Nuclear Sci. Technol.

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Abstract. This paper presents 2D generalized plain strain simulations of the thermo-mechanical response of a pellet fragment and overlying cladding during a RIA transient. A fictitious hydride blister of increasing depth (25 to 90% of the clad thickness) is introduced at the beginning of the calculation. When a pre-determined hoop stress is exceeded at the clad outer surface, radial cracking of the blister is taken into account in the simulation by a modification of the mechanical boundary conditions. The hoop stress criterion is based on Finite Element simulations of laboratory hoop tensile tests performed on highly irradiated samples with a through-wall hydride blister. The response of the remaining clad ligament (beneath the cracked blister) to the pellet thermal expansion is then studied. The simulations show that plastic strains localize in a band orientated at ∼45°to the radial direction, starting from the blister crack tip and ending at the clad inner wall. This result is in good agreement with the ductile shear failures of the clad ligaments observed post-RIA transients. Based on a local plastic strain failure criterion in the shear band, ALCYONE simulations are then used to define the enthalpy at failure in function of the blister depth.

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“…Gradien termal diinduksi di dalam kelongsong memicu thermo-difusi hidrogen menuju daerah terdingin, di mana oksida itu pecah. Apabila kelarutan hidrogen dalam zirconium melebihi batas, atom hydrogen menyebar dan kemudian mengendap dalam bentuk hidrida zirconium di tempat dingin tersebut, membentuk daerah yang sangat hydrid yang disebut gelembung hidrida [4] . Selain itu juga telah dilakukan penelitian untuk meningkatkan penguatan resistansi terhadap korosi dan kekuatan yang lebih baikpada bahan zircaloy-4 dengan modifikasi permukaan menggunakan sinar laser [5] .…”

Section: Pendahuluanunclassified

Analisis Tekstur Zircaloy-4 Menggunakan Metode William–imhof–matthies-Vinel (Wimv)

Priyanto

2015

urania

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ANALISIS TEKSTUR ZIRCALOY-4 MENGGUNAKAN METODE WILLIAM–IMHOF–MATTHIES-VINEL (WIMV). Zircaloy-4 sebagai kelongsong bahan bakar nuklir telah banyak diteliti secara makroskopik maupun secara mikroskopik, namun penelitian menggunakan teknik difraksi neutron, terutama karakterisasi orientasi kristalit (tekstur) di Indonesia masih jarang dilakukan. Tujuan penelitian ini adalah untuk menerapkan metode WIMV pada karakterisasi tekstur bahan tersebut. Metode WIMV adalah salah satu metode analisis tekstur bahan yang diperoleh dengan teknik difraksi neutron atau difraksi sinar-X. Dari hasil analisis tersebut diperoleh pole figure 002 dengan indeks tekstur (F2) terbesar dibandingkan dengan pole figure yang lain yaitu 100, 101, 102 dan 110. Indeks tekstur (F2) pole figure 002 untuk incomplete pole figure, F2= 4,69 m.r.d dengan faktor reliabilitas RP0 = 3,28%, dan recalculated pole figure, F2 = 4,42 m.r.d. dengan RP1 = 2,97%. Semua pole figure diperoleh faktor reliabilitas dengan pole figure rata-rata RP0 = 6,60%, RP1 = 5,02%, entropy = - 0,5871, dan indeks tekstur, F2= 2,34 m.r.d. Hasil analisis bahan Zircaloy-4 tersebut menyimpulkan bahwa metode WIMV dapat digunakan untuk menentukan arah orientasi tekstur, dimana tekstur yang paling kuat mengarah ke <001> (arah sumbu c) dalam struktur hexagonal.TEXTURE ANALYSIS OF ZIRCALOY-4 USING WILLIAM-IMHOF-Matthies-VINEL (WIMV) METHOD. Zircaloy-4 as a nuclear fuel cladding has been widely examined macroscopically and microscopically, but research using neutron diffraction technique, especially the characterization of crystallite orientation (texture) in Indonesia is still rare. The purpose of this study is to apply the methods of William-Imhof-Matties-Vinel (WIMV) on the characterization of zircaloy-4 material texture. WIMV is one of data analysis method for textures materials obtained by neutron or x-ray diffractions technique. The analysis is obtained that 002 pole figure has the largest texture index (F2) compared to the others pole figures, that are 100, 101, 102 and 110. Index texture (F2) of pole figure 002 for incomplete pole figures, F2 = 4.69 m.r.d with a reliability factor RP0 = 3.28%, and recalculated pole figures, F2 = 4.42 m.r.d with RP1 = 2.97%. For all pole figures, it is obtained that a reliability factor of the average RP0= 6.60%, RP1 = 5.02%, entropy = - 0.5871, and texture index (F2) = 2.34 m.r.d. Data analysis showed that the WIMV method can be used to determine the direction of the crystallite orientation of the pole figure where the most powerful texture leads to the <001>(c-axis direction) in a hexagonal structure.

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Fracture of Zircaloy-4 Fuel Cladding Tubes with Hydride Blisters

Cited by 17 publications

References 20 publications

Self‐inflicted fracture of expanding surface precipitates

Self‐inflicted fracture of expanding surface precipitates

2D simulation of hydride blister cracking during a RIA transient with the fuel code ALCYONE

Analisis Tekstur Zircaloy-4 Menggunakan Metode William–imhof–matthies-Vinel (Wimv)

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