Design and Evaluation of an Experimental Technique for Mechanical and Fatigue Testing of Sub-Sized Samples

Lomakin, Ivan; Arutyunyan, A. R.; Valiev, R. Z.; Gadzhiev, Farid A.; Murashkin, M. Yu.

doi:10.1007/s40799-017-0229-7

Cited by 12 publications

(14 citation statements)

References 28 publications

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“…The mechanical properties were determined on flat microspecimens (5.7 mm long, 2 mm wide, and 1 mm thick) in a Shimadzu AGX-50 Plus (Kyoto, Japan) universal testing machine. To fix the microspecimens in the grips of the testing machine, we used a special clamping device described in detail in [34]. The strain rate was 5 × 10 −4 s −1 .…”

Section: Methodsmentioning

confidence: 99%

Effect of Severe Plastic Deformation on Structure Refinement and Mechanical Properties of the Al-Zn-Mg-Fe-Ni Alloy

Бродова

Rasposienko

Ширинкина

et al. 2021

Metals

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This paper identifies the mechanisms of phase and structural transformations during severe plastic deformation by shearing under pressure (high-pressure torsion) of an Al-Zn-Mg-Fe-Ni-based aluminum alloy depending on different initial states of the material (an ingot after homogenizing annealing and a rod produced by radial-shear rolling). Scanning and transmission electron microscopy are used to determine the morphological and size characteristics of the structural constituents of the alloy after high-pressure torsion. It has been found that, irrespective of the history under high-pressure torsion, fragmentation and dynamic recrystallization results in a nanostructural alloy with a high microhardness of 2000 to 2600 MPa. Combined deformation processing (high-pressure torsion + radial-shear rolling) is shown to yield a nanocomposite reinforced with dispersed intermetallic phases of different origins, namely Al9FeNi eutectic aluminides and MgZn2, Al2Mg3Zn3, and Al3Zr secondary phases. The results of uniaxial tensile testing demonstrate good mechanical properties of the composite (ultimate tensile strength of 640 MPa, tensile yield strength of 628 MPa, and elongation of 5%).

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Section: Methodsmentioning

confidence: 99%

Effect of Severe Plastic Deformation on Structure Refinement and Mechanical Properties of the Al-Zn-Mg-Fe-Ni Alloy

Бродова

Rasposienko

Ширинкина

et al. 2021

Metals

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“…The electrolyte consisted of 1/3 HNO3 + 2/3 methanol at a temperature - Measurements of the mechanical properties of the alloy subjected to different thermomechanical treatments were carried out via uniaxial tensile tests over sub-sized specimens. An experimental technique described in [27] using a Shimadzu AGX-50 Plus universal mechanical testing machine with strain rate of 5 × 10 −4 s −1 was used. The mechanical parameters presented in the paper are averaged over three tests.…”

Section: Methodsmentioning

confidence: 99%

Microstructure, mechanical properties and aging behaviour of nanocrystalline copper–beryllium alloy

Lomakin

Castillo-Rodríguez

Sauvage

2019

Materials Science and Engineering: A

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A complex study of aging kinetics for both coarse-grained and nanostructured by severe plastic deformation Cu -2 wt.% Be alloy is reported. It is shown that aging of a coarse-grained alloy leads to continuous formation of nanosized CuBe body centred cubic (bcc, CsCltype) semi-coherent particles with the {220} Cu // {200} CuBe crystallographic orientation relationship. These particles created significant internal stress fields and became obstacles for dislocation glide that resulted in a change in the hardness from 95 Vickers hardness (HV) for the solubilized alloy to 400 HV for the aged one. The severe plastic deformation led to the formation of a single-phase nanograined microstructure with an average grain size of 20 nm and 390 HV. It was found that this grain size was slightly driven by grain boundary segregation. Further aging of the nanocrystalline alloy led to the discontinuous formation of precipitates on the former Cu grain boundaries and skipping of metastable phases. Significant age hardening with a maximum hardness of 466 HV for the aged nanostructured alloy was observed.Mechanical tests result revealed a strong influence of microstructure and further aging on strength capability of the alloy for both coarse-grained and nanostructured alloy. A good thermal stability in the nanostructured alloy was also noticed. Theoretical calculations of the hardness value for the CuBe phase are provided. It was shown that Be as a light alloying elements could be used for direct change of microstructure and aging behaviour of severely deformed copper alloys.

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“…123 For sub-size standard specimens with the same microstructure the cracks initiated in exactly the same way as in standard-sized specimens. 134 For the hydraulic bulge fatigue test, the cracks always initiate on the flat side of the specimen. 182…”

Section: Crack Growthmentioning

confidence: 99%

“…210 When sub-size standard specimens were tested with the same microstructure as standard specimens, the cracks propagated in the same way. 134…”

Section: Crack Growthmentioning

confidence: 99%

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Kazakeviciute

Rouse

Focatiis

et al. 2021

The Journal of Strain Analysis for Engineering Design

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Small specimen mechanical testing is an exciting and rapidly developing field in which fundamental deformation behaviours can be observed from experiments performed on comparatively small amounts of material. These methods are particularly useful when there is limited source material to facilitate a sufficient number of standard specimen tests, if any at all. Such situations include the development of new materials or when performing routine maintenance/inspection studies of in-service components, requiring that material conditions are updated with service exposure. The potentially more challenging loading conditions and complex stress states experienced by small specimens, in comparison with standard specimen geometries, has led to a tendency for these methods to be used in ranking studies rather than for fundamental material parameter determination. Classifying a specimen as ‘small’ can be subjective, and in the present work the focus is to review testing methods that utilise specimens with characteristic dimensions of less than 50 mm. By doing this, observations made here will be relevant to industrial service monitoring problems, wherein small samples of material are extracted and tested from operational components in such a way that structural integrity is not compromised. Whilst recently the majority of small specimen test techniques development have focused on the determination of creep behaviour/properties as well as sub-size tensile testing, attention is given here to small specimen testing methods for determining specific tensile, fatigue, fracture and crack growth properties. These areas are currently underrepresented in published reviews. The suitability of specimens and methods is discussed here, along with associated advantages and disadvantages.

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Design and Evaluation of an Experimental Technique for Mechanical and Fatigue Testing of Sub-Sized Samples

Cited by 12 publications

References 28 publications

Effect of Severe Plastic Deformation on Structure Refinement and Mechanical Properties of the Al-Zn-Mg-Fe-Ni Alloy

Effect of Severe Plastic Deformation on Structure Refinement and Mechanical Properties of the Al-Zn-Mg-Fe-Ni Alloy

Microstructure, mechanical properties and aging behaviour of nanocrystalline copper–beryllium alloy

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

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