Mechanical properties of structural metallic alloys for nuclear applications deduced by small punch test

Melkior, Thomas; Terentyev, Dmitry; Chang, ChihCheng; Bakaev, Alexander; Holmström, Stefan; Lebediev, S.; Paputsia, A.

doi:10.1016/j.jnucmat.2023.154521

Cited by 8 publications

(2 citation statements)

References 41 publications

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“…Different to the stress-strain curve obtained from uniaxial tensile tests, the output of the small punch test is a load-displacement curve. Thus, small punch results should be further processed to realize materials properties' estimations [8,9]. The most widely used method is the empirical correlation method [10].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Tensile Properties of Inconel 625 Using Small Punch Test

Li,

Shi,

Zhang

et al. 2024

Metals

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As a commonly used material in the petrochemical, nuclear and aerospace fields, Inconel 625 has excellent strength and corrosion resistance. The accurate evaluation of material properties with small specimen volume is of great significance to ensure in-service equipment safety. To realize reasonable estimations of tensile strength based on the small punch test, load–displacement and slope–displacement curves of Inconel 625 were discussed in this study. The results prove that the first inflexion point can be used in the yield strength analysis based on the empirical correlation method and plate bend theory. Meanwhile, the lowest point of the elastic and plastic deformation stages in the slope–displacement curves were compared. A new deformation energy method was established to realize yield strength estimations. To analyze the ultimate tensile strength, a small punch deformation feature was discussed based on the geometric deformation model and microstructure analysis. The relationship between stress and displacement was obtained. Fm/dmt0 was proven to be a more appropriate parameter in ultimate tensile strength estimations.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Tensile Properties of Inconel 625 Using Small Punch Test

Li,

Shi,

Zhang

et al. 2024

Metals

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“…It provides estimations of mechanical properties with small amounts of material and has received much attention as a high-throughput characterization method. For example, this is of major interest for irradiated and activated materials [4,5]. The primary output of the quasi-static SP test is the punch force as a function of the punch displacement-force-displacement curve F(v)-or as function of specimen deflection-force-deflection curve F(u).…”

Section: Introductionmentioning

confidence: 99%

An Improved Correlation for the Estimation of the Yield Strength from Small Punch Testing

Altstadt

2023

Metals

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This study aims at improving the empirical correlation for estimating the yield strength from small punch tests. The currently used procedure in the European standard EN 10371 to determine the elastic–plastic transition force—based on bi-linear fitting—involves a dependency not only on the onset of plastic flow but also on the work hardening of the material. Consequently, the yield strength correlation factor is not universal but depends on the material properties and on the geometry of the small punch set-up, leading to a significant uncertainty in the yield strength estimation. In this study, an alternative definition of the elastic–plastic transition force is proposed, which depends significantly less on the work hardening of the material and on the small punch geometry. The approach is based on extensive elastic–plastic finite element simulations with generic material properties, including a systematic variation of the yield strength, ultimate tensile strength, and uniform elongation. The new definition of the transition force is based on the deviation of the force-deflection curve from the analytical elastic slope derived by Reissner’s plate theory. A significant reduction of the uncertainty of the yield strength estimation is demonstrated.

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