Effect of gripping system on the measured upper yield strength estimated by tensile tests

Mucsi, András

doi:10.1016/j.measurement.2012.11.036

Cited by 9 publications

(13 citation statements)

References 2 publications

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“…If a perfectly symmetrical test piece (e=0 mm) is loaded elastically by tensioning it is not sure that the eccentricity will be equal to zero. The loading force can act everywhere inside the spatial friction cone, therefore the initial eccentricity can be estimated as [8]: (2) where µ is the coefficient of friction and d is the inner diameter of the bearing. The coefficient of friction is considerably smaller by rolling bearings (µ=0.001-0.005) [15] than by sliding bearings (µ=0.05-0.1); therefore the initial eccentricity and thus the initial misalignment of the test piece must be much larger by sliding bearings.…”

Section: Resultsmentioning

confidence: 99%

“…The specimen was attached to the gripping systems using the same high strength gluefortification technique as in Ref. [8].…”

Section: Gripping Systems Usedmentioning

confidence: 99%

“…The gripping system used for clamping the specimen determines the stress distribution inside the test piece; therefore it strongly influences the value of upper yield strength and the creep behavior of metallic materials [1][2][3][4][5][6][7]. In general case, the uncertainties come from the initial misalignment and non-axial loading of the test piece during the elastic region of the tests, so the errors are mainly caused by the grips used for tensile testing [7,8]. A detailed description about the generally used gripping systems can be found in the comprehensive study of Davis [7].…”

Section: Introductionmentioning

confidence: 99%

“…Gripping systems affect the stress distribution inside the test piece and in an indirect manner they largely influence the upper yield strength as well [3][4][5]8]. The effect of a gripping system on the stress distribution inside the test piece can be measured by the widely used strain gauge technique [2, 9-11], neutron diffraction [12] and interferometry [13].…”

Section: Introductionmentioning

confidence: 99%

“…In order to avoid the errors caused by the conventional grips, a novel gripping system was developed and published in an earlier study [8]. It seems to be suitable for accurate measurement of upper yield strength of low carbon steels; moreover it could be applied for creep tests as well.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Stress Distribution in Tensile Test Specimens Using Modified Versions of a Novel Gripping System

Mucsi

2013

ujme

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This paper deals with the effect of novel gripping systems developed for tensile testing on the stress distribution inside the test piece. The uniformity of the stress distribution plays a decisive role in measuring the upper yield strength and creep behavior of materials. In this study two modified versions of a recently developed gripping system are introduced and tested together with the original version. The tests consist of measuring the bending stress/axial stress ration during elastic loading of the test piece. The bending stress/average stress ratio was measured using a special strain gauge mounted test piece, which was loaded by elastic tension. The results show that the gripping systems provide the self-alignment of the test piece at the beginning of the loading; therefore they can ensure almost true uniaxial conditions for tensile testing. The average bending stress/axial stress ratio is found to be just 1-2 %, so, the gripping systems can provide the accurate measurement of upper yield strength and creep curves of materials.

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Section: Resultsmentioning

confidence: 99%

“…The specimen was attached to the gripping systems using the same high strength gluefortification technique as in Ref. [8].…”

Section: Gripping Systems Usedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Stress Distribution in Tensile Test Specimens Using Modified Versions of a Novel Gripping System

Mucsi

2013

ujme

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The Cold Angular Rolling Process of Copper Sheets: Unraveling Plastic Deformation Behavior and Unveiling Microstructural Transformations

Lee,

Bhatta,

et al. 2023

Adv Eng Mater

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The cold angular rolling process (CARP) is being developed as a continuous severe plastic deformation (SPD) technique, which can process metal sheets without any length limitations at room temperature. CARP contains cold rolling and equal‐channel angular process components. The sheet thickness is kept consistent before and after CARP, allowing multiple passes of the sheet. The desired microstructure and mechanical properties can be achieved in the processed metallic sheets. The current study is aimed to evaluate the capability of CARP by processing copper sheets with different sheet widths for repetitive passes. The CARP‐treated sheets are examined by lab‐scale X‐ray and high‐energy synchrotron X‐ray diffraction to investigate the evolution in dislocation density, texture, and strain anisotropy, and by tensile testing to identify the bulk mechanical properties. The digital image correlation (DIC) method is applied to tensile testing so that strain localization within the sample gauge was visualized and deformation behavior was evaluated after yielding till post‐necking by estimating the hardening exponent and strain hardening rate of the CARP‐treated sheet. Comparing the reported continuous and multiple‐step processes on Cu and its alloys, the present study confirms CARP is potentially a useful sheet process for strengthening ductile metals.This article is protected by copyright. All rights reserved.

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Experimental Investigation of Stress Distribution in a Tensile Test Specimen, Using a Novel Gripping System for Tensile Testing

Mucsi

2016

Topics in Intelligent Engineering and Informatics

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Effect of gripping system on the measured upper yield strength estimated by tensile tests

Cited by 9 publications

References 2 publications

Analysis of Stress Distribution in Tensile Test Specimens Using Modified Versions of a Novel Gripping System

Analysis of Stress Distribution in Tensile Test Specimens Using Modified Versions of a Novel Gripping System

The Cold Angular Rolling Process of Copper Sheets: Unraveling Plastic Deformation Behavior and Unveiling Microstructural Transformations

Experimental Investigation of Stress Distribution in a Tensile Test Specimen, Using a Novel Gripping System for Tensile Testing

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