The issue of stress state during mechanical tests to assess cladding performance during a reactivity-initiated accident (RIA)

Desquines, Jean; Koss, D. A.; Motta, Arthur T.; Cazalis, B.; Petit, Marc

doi:10.1016/j.jnucmat.2011.03.015

Cited by 91 publications

(50 citation statements)

References 36 publications

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“…The stress biaxiality is between 0.6 and 0.95. Efforts are currently underway to develop easy-to-use testing techniques on cladding tubes that cover such loading biaxiality levels [22,12,23].…”

Section: Resultsmentioning

confidence: 99%

Thermomechanical loading applied on the cladding tube during the pellet cladding mechanical interaction phase of a rapid reactivity initiated accident

Ménibus¹,

Sercombe²,

Auzoux³

et al. 2014

Journal of Nuclear Materials

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International audienceCalculations of the CABRI REP-Na5 pulse were performed with the ALCYONE code in order to determine the evolution of the thermomechanical loading applied on the cladding tube during the Pellet-Cladding Mechanical Interaction (PCMI) phase of a rapid Reactivity Initiated Accident (RIA) initiated at 280 °C that lasted 8.8 ms. The evolution of the following parameters are reported: the cladding temperature, heating rate, strain rate and loading biaxiality. The impact of these parameters on the cladding mechanical behavior and fracture are then briefly reviewed

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Section: Resultsmentioning

confidence: 99%

Thermomechanical loading applied on the cladding tube during the pellet cladding mechanical interaction phase of a rapid reactivity initiated accident

Ménibus¹,

Sercombe²,

Auzoux³

et al. 2014

Journal of Nuclear Materials

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“…The PROMETRA database includes tests at different biaxiality levels from uniaxial to plane-strain, with uniaxial tests in cladding axial direction, uniaxial ring tests, plane strain tensile tests and burst tests. Nevertheless, and as recently stated by Desquines et al [9], additional work is required to predict the cladding tube fracture at RIA representative stress state. In addition, it is important to improve the understanding of the effect of the hydride microstructure on the cladding fracture.…”

Section: Introductionmentioning

confidence: 90%

Fracture of Zircaloy-4 cladding tubes with or without hydride blisters in uniaxial to plane strain conditions with standard and optimized expansion due to compression tests

Ménibus¹,

Auzoux²,

Mongabure³

et al. 2014

Materials Science and Engineering: A

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test, which induces a near uniaxial loading, were proposed and developed to reach higher biaxiality ratios (ratio between mechanical quantities in axial and in circumferential direction). The first optimization, named HB-EDC for High-Biaxiality EDC, allowed to reach transverse plane strain conditions. The second optimization, named VHB-EDC for Very High Biaxiality EDC, was designed to reach higher loading biaxiality ratios. These optimized EDC tests were performed * Tel.: +33 1 69 08 39 43; e-mail: arthur.hellouin-de-menibus@cea.fr 1 at 25 • C, 350 • C and 480 • C on unirradiated hydrided Cold Worked Stress Relieved (CWSR) Zircaloy-4 samples. First, samples unhydrided or uniformly hydrided up to 1130 wppm were tested. Secondly, samples hydrided at 310 wppm with a hydride blister were tested. A large ductility reduction is induced by the increase in biaxiality level in absence of a hydride blister or with small blisters (<50 µm deep). The fracture strain decreases quickly with the blister depth at 25 • C, but more progressively at higher temperature. An equation that quantifies the fracture strain reduction with the blister depth is proposed. Eventually, one of the tests developed in the present study, the HB-EDC test, was proven to be a good compromise between the test complexity and the stress state reached. It is a good candidate to characterize the mechanical behaviour of irradiated cladding.

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“…4(b) and (c), if the pellet-cladding friction coef cient is assumed to be 0.05, the nite element method (FEM) analysis of the A-EDC test has revealed that the strain ratio of ε z / ε θ uctuates slightly around −0.5, and the stress ratio of σ z / σ θ remains nearly zero, which is close to the uniaxial tension requirments. 9,10) In the comparison, the FEM of conventional EDC test shows that its strain ratio is around −0.5, but the stress ratio ranges from −0.25 to 0.2 9,19) , which is probably ascribed to the variable friction on the pellet-cladding contact surface. Figure 5 shows load-hoop strain and load-height displacement curves, where the hoop strain and height displacement belong to the cladding specimen and Cu inner pellet, respectively.…”

Section: Microstructure Of Zircaloy-4mentioning

confidence: 98%

“…Fig. 4 (a) system of A-EDC simulation; Comparison of (b) ε z /ε θ ratio and (c) σ z /σ θ ratio in A-EDC and EDC 9,19) tests derived from FEM analysis; ID-Inner diameter; MD-Middle diameter; OD-Outer diameter. the inner pellet fairly xed the position of the ring-shaped specimen.…”

Section: Microstructure Of Zircaloy-4mentioning

confidence: 99%

“…There are dif culties in achieving reliable yield strength (YS) and ultimate tensile strength (UTS) due to the friction problems on the piston-pellet interface and piston-cladding interface. 9) On one hand, compression the pistons will make the Te on inner pellet dense, so the friction between piston and pellet is variable, resulting in uncertain friction problem. On the other hand, in the condition of severe deformation, the clearance gap between pistons and specimen will cause leakage of inner pellet materials (Te on), which also leads to the uncertainty of friction.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties of Zircaloy-4 Cladding Tube by Advanced Expansion due to Compression (A-EDC) Test

et al. 2017

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A new testing technique named advanced expansion due to compression (A-EDC) has been developed with an attempt to study the hoop mechanical behavior of Zircaloy-4 cladding under the pellet-cladding mechanical interaction (PCMI) and the presumed reactivity-initiated accident (RIA). The Zircaloy-4 used in this work showed elongated grains in the tube longitudinal direction, large amounts of residual strain, and crystallographic texture. The nite element method (FEM) analysis illustrates that the A-EDC test shows a uniaxial tension in the hoop direction, which has also been con rmed by experiments. In addition, the hoop stress-strain curve has been derived at room temperature by the A-EDC tests. Moreover, the fractured surface has been observed in this research.

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The issue of stress state during mechanical tests to assess cladding performance during a reactivity-initiated accident (RIA)

Cited by 91 publications

References 36 publications

Thermomechanical loading applied on the cladding tube during the pellet cladding mechanical interaction phase of a rapid reactivity initiated accident

Thermomechanical loading applied on the cladding tube during the pellet cladding mechanical interaction phase of a rapid reactivity initiated accident

Fracture of Zircaloy-4 cladding tubes with or without hydride blisters in uniaxial to plane strain conditions with standard and optimized expansion due to compression tests

Mechanical Properties of Zircaloy-4 Cladding Tube by Advanced Expansion due to Compression (A-EDC) Test

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