Improved evaluation of ring tensile test ductility applied to neutron irradiated 42XNM tubes in the temperature range of (500–1100)°C

Гурович, Б. А.; Фролов, А. С.; Fedotov, Ivan

doi:10.1016/j.net.2019.11.019

Cited by 16 publications

(3 citation statements)

References 28 publications

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“…One of these non-conventional techniques is the ring tensile test, which involves the use of two D-shaped blocks (mandrels) fitted into the ring and opposite forces applied to the D-blocks until the ring ruptures. Researchers such as Ktari et al [2], Frolov et al [3], Gurovich et al [4], and Yoon et al [5] have studied this technique. Barsoum et al [6] used two mandrel designs: one with lubricated D-shaped blocks and the other using lubricated D-shaped blocks with needle roller bearing (which decreased friction coefficient into ~ 50% of its value upon using needle bearing), also further investigation was carried out to optimize the ring specimen with a reduction in its cross-section to maintain a uniform stress distribution along the gauge length and give a fracture at the center of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Seamless Pipes Using Ring Expansion Technique and Novel Hoop Stress Correlation Factor (K)

Abdelgawad,

Nassef,

Eraky

et al. 2023

Exp Tech

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This study investigated the stress–strain behavior of seamless pipes in the hoop direction using the ring expansion test, which is a non-standardized mechanical testing technique used for evaluating the mechanical properties of round tubes. However, this technique has limitations, such as unidentified specimen geometry, strain measurement, and the estimation of friction coefficients. The study employed experimental, numerical, and analytical methodologies to address these limitations and throughout the study, a novel hoop stress correlation factor (K) was identified to be multiplied by the hoop stress derived equation for reduced section ring specimens. The experimental strain was measured using a newly derived analytical equation, and a mathematical predictive model was developed to estimate the K-factor using the Design of Experiment (DoE) and Design-Expert statistical software. The study concluded that the ring expansion test is a promising technique for evaluating the mechanical properties of seamless pipes similar to the unified axial tensile stress–strain behavior. However, future research is needed to estimate the hoop stress correlation value (K) for all ring geometries. The study's finding of the novel hoop stress correlation factor (K) in the case of a reduced section ring specimen is particularly noteworthy, as it addresses a significant research gap in the field.

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Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Seamless Pipes Using Ring Expansion Technique and Novel Hoop Stress Correlation Factor (K)

Abdelgawad,

Nassef,

Eraky

et al. 2023

Exp Tech

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“…The alloy has been already used as the structural material of absorbing rods in WWER-1000 reactors and as the fuel cladding in nuclear-powered ships and submarines. The previous experiments on 42XHM alloy were presented in [2], [3].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation of Chrome-Nickel Alloy

Chalupová

Steinbrück

Große

et al. 2020

APP

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The investigations in this paper deal with the Cr-Ni alloy. The material has been recently proposed as a potential ATF concept, primarily due to its behaviour under high-temperature oxidation. A set of experiments to determine the melting point and describe the oxidation kinetics of the Cr-Ni alloy were performed in Karlsruhe Institute of Technology. Presented results reveal its superb oxidation resistance comparing to zirconium alloys. Therefore, the alloy has a great potential for nuclear applications.

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“…Meanwhile, new non-conventional techniques are being developed to simulate the working conditions of the pipe in service (this study aims to investigate a seamless pipe subjected to internal pressure only), or the available material is limited. One of these techniques is the ring tensile test studied by the researchers Ktari et al [2], Frolov et al [3], Gurovich et al [4], and Yoon et al [5] which used two Dshaped blocks (also known as mandrel) tted in the ring and two opposite forces are applied to the Dblocks until the ring is ruptured. Additionally, Khalfallah et al[6] proposed ve new designs by introducing cylindrical rolling bearings to reduce the resulting friction at the ring/mandrel interface where friction has a signi cant effect.…”

mentioning

confidence: 99%

Correlating the stress-strain behavior of the ring expansion technique with the conventional tensile test

Abdelgawad

Nassef

Eraky

et al. 2023

Preprint

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Background The ring expansion technique is a non-standardized material testing used to evaluate round tubes’ mechanical properties such as burst pressure and stress-strain behavior, however, this technique has limitations such as lack of suggested specimen geometry, strain measurement technique, and friction coefficient(s) estimation. Objective This study primarily aims to evaluate the stress-strain property in the hoop direction for seamless pipes with a further correlation with the tensile stress-strain curve. Moreover, investigating the specimen’s geometry effect on the results was also considered throughout the study. Methods Experimental, simulation, and analytical techniques were carried out and through their conjunction, it was applicable to estimate hard-to-measure coefficients, identify and evaluate new correction factors, and validate the simulation and analytical results. Results Experimental strain measurements were performed by derived analytical equation rather than an external measuring device, novel evaluation of the hoop stress correction value (K) was performed by the comparison between experimental and simulation work, in addition to a convenient similarity between the standard tensile test and the non-conventional proposed technique results. Conclusion The ring expansion test is a promising technique to evaluate the seamless pipes' burst pressure, stress-strain behavior, and other mechanical properties. Furthermore, the authors recommend future work regarding estimating both pressure dissipation factor (α) in terms of friction coefficients and hoop stress correction value (K) in terms of ring’s geometry.

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Improved evaluation of ring tensile test ductility applied to neutron irradiated 42XNM tubes in the temperature range of (500–1100)°C

Cited by 16 publications

References 28 publications

Mechanical Behavior of Seamless Pipes Using Ring Expansion Technique and Novel Hoop Stress Correlation Factor (K)

Mechanical Behavior of Seamless Pipes Using Ring Expansion Technique and Novel Hoop Stress Correlation Factor (K)

High-Temperature Oxidation of Chrome-Nickel Alloy

Correlating the stress-strain behavior of the ring expansion technique with the conventional tensile test

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