Improvements in the design and analysis of the segmented expanding mandrel test

Nobrega, Bernardo N.; King, John S.; Was, Gary S.; Wisner, SB

doi:10.1016/0022-3115(85)90448-9

Cited by 23 publications

(4 citation statements)

References 7 publications

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“…Therefore, the strain biaxiality in the sample, (εzz/εθθ), is not representative of that experienced by fuel cladding during PCMI. In order to produce a more representative biaxial strain state in the sample, Nobrega [15] introduced two axial retainers at the ends of the tube to restrain it from axial shrinkage (Fig. 1b).…”

Section: Introductionmentioning

confidence: 99%

The effect of strain biaxiality on the fracture of zirconium alloy fuel cladding

Zouari

Bono

Boulch

et al. 2021

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 99%

The effect of strain biaxiality on the fracture of zirconium alloy fuel cladding

Zouari

Bono

Boulch

et al. 2021

Journal of Nuclear Materials

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“…In order to produce a greater strain ratio in the sample, the ends of the tubular sample have been restrained using various means to prevent it from contracting axially. [26,27] The end-restraining fixture used by Nobrega et al [27] prevents any change in length of the sample, so the strain biaxiality is greater than that of a free-end test. Hellouin de Menibus et al [28] used this type of fixed-end EDC test to study the effects of hydride blisters on the fracture of Zircaloy-4 tubes.…”

Section: Previous Experimental Methodsmentioning

confidence: 99%

Biaxial expansion due to compression experiments for measuring the failure strain of tubular samples

Bono,

Zouari,

Le Jolu

et al. 2023

Strain

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The failure strain of a tube is a function of the biaxial strain ratio (axial strain/hoop strain) to which it is subjected. The relationship between failure strain and the strain ratio can be determined experimentally using expansion due to compression tests with a tensile load (EDCT), in which a ductile pellet placed inside the tube is compressed axially so it expands in diameter and imposes a hoop strain on the tube. At the same time, a tensile load on the ends of the tube creates an axial strain. This study investigates the capabilities and limitations of EDCT tests using two devices that allow experiments to be performed on a standard tensile testing machine. The first device applies an axial force on the ends of the sample, and the second device applies an axial displacement. Tests on zirconium alloy tubes confirmed that the failure strain is dependent on the strain ratio and the metallurgical state of the material. EDCT tests can produce a range of strain ratios, but there is an upper limit on the strain ratio that can be obtained, and it is dependent on the plastic behaviour of the sample and the friction conditions between the components.

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“…Considering that PCMI played an important role in the destruction of cladding [7][8][9], the researchers have designed a variety of experimental devices to study PCMI. Historically, PCMI testing has often been experimented with segmented expansion mandrel tools [10].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of mechanical interaction between pellet and zircaloy-4 cladding under reactivity-initiated accident conditions

Zhou,

Xu,

Liu

et al. 2023

J. Phys.: Conf. Ser.

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Reactivity-initiated accident (RIA) is one of the accidents considered by fuel safety criteria. The power pulse caused abrupt expansion of the pellet, leading to pellet and cladding mechanical interaction (PCMI). Cladding ductility is gradually decreased in the process of oxidation and hydrogen uptake during irradiation. As a result, the extrusion of the pellet to the cladding causes the cladding to produce greater hoop stress and hoop strain, which leads to damage. A simulation of PCMI using ABAQUS was designed to analyze cladding mechanic properties. By comparing the calculation results of the simulation scheme with the data obtained in the reactor experiment, it is proved that the simulation calculation results are in good agreement with the experimental data in the reactor, and the rationality of the simulation scheme is verified. Based on the out-pile mandrel equipment simulated PCMI, the corresponding finite element model was established to study related test parameters. By analyzing the results of the simulation calculation outside the reactor, it is found that the pellet material, cladding temperature, compression rate, tensile load, friction coefficient and the cladding hoop stress and hoop strain have a certain relationship: (1) The choice of pellet material affects the reactor. The overall law of hoop stress-strain in the external simulation results basically has no effect. (2) The temperature of the cladding has effect on the hoop stress peak. (3) The compression rate has effect on the time for the cladding to reach the hoop peak stress. (4) Tensile load will affect the starting position of the hoop stress-strain of the cladding. (5) The friction coefficient has a significant influence on the stress and strain trend of the cladding. The outside experiment can be carried out more effectively, and it can provide guidance and a basis for the outside experiment.

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Improvements in the design and analysis of the segmented expanding mandrel test

Cited by 23 publications

References 7 publications

The effect of strain biaxiality on the fracture of zirconium alloy fuel cladding

The effect of strain biaxiality on the fracture of zirconium alloy fuel cladding

Biaxial expansion due to compression experiments for measuring the failure strain of tubular samples

Numerical simulation of mechanical interaction between pellet and zircaloy-4 cladding under reactivity-initiated accident conditions

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