Examination of Hardening Curves Definition Methods in Torsion Test

Erpalov, M. V.; Kungurov, E.A.

doi:10.4028/www.scientific.net/ssp.284.598

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…A review of the well-known studies on the determination of the rheological properties of materials during torsion testing indicates that there is no the simple and reliable method to study the rheological properties of materials that are sensitive to the strain rate. This is also confirmed by the results of paper [21], in which, using computer simulation, it was shown that it is impossible to reproduce an arbitrarily given material hardening curve taking into account the effect of strain rate by existing methods.…”

Section: The Methods For Determining the Rheological Properties Of Ma...supporting

confidence: 65%

The Method of Testing Cylindrical Specimen for Torsion in Order to Determine the Rheological Properties of Materials Sensitive to the Strain Rate

Erpalov

Pavlov

2020

SSP

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The article provides an overview of existing methods of testing specimen for torsion, in order to determine the rheological properties of materials. In addition, the approaches to the post-processing experimental data, obtained in the form of torque-twist angle curve, are reviewed. It is shown that there is no universal and reliable method to study the rheological properties of materials that are sensitive to the strain rate. This paper proposes the new testing method that takes into account the effects of strain rate hardening initially. This method is that the torsion tests are carried out with the variable grips acceleration. The post-processing of obtained experimental data can be carried out with the use of modified Nadai method. In addition, with the use of mathematical modeling it is shown that the new method is reliable, regardless of material properties. The application for invention of the new testing method No2018132149 was directed in Federal Institute of Industrial Property on September, 7, 2018.

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Section: The Methods For Determining the Rheological Properties Of Ma...supporting

confidence: 65%

The Method of Testing Cylindrical Specimen for Torsion in Order to Determine the Rheological Properties of Materials Sensitive to the Strain Rate

Erpalov

Pavlov

2020

SSP

Self Cite

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“…In paper [7] it is shown that existing methods of testing specimens by torsion, such as [8][9][10][11][12][13], do not allow to study the rheological properties of steels and alloys sensitive to the strain rate, in the hot state for example. In order to ensure the reliability of the obtained data on the strain resistance with the use of torsion tests,…”

Section: The Torsion Testing Methods With Variable Grip's Accelerationmentioning

confidence: 99%

Computer Simulation of the Torsion Testing Method with Variable Grip’s Acceleration

Mikhail¹,

Pavlov²

2019

KEG

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“…In [15], it was shown that calculation of the effective strain in accordance with Eq. 3 leads to large errors in determining hardening curves.…”

Section: Computer Simulation Of Torsion Testmentioning

confidence: 99%

The Influence of Cylindrical Specimen Size and Material Properties on the Distribution of Deformation during Torsion Test

Erpalov

2020

SSP

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Torsion tests allow to study the rheological properties of various materials, including properties in hot state, as well as they allow to conduct physical simulations of real material forming processes, including processes of intensive and alternating deformation. However, it is often a question what size the specimen should have to perform torsion test accurately. The article aims to study the influence of cylindrical specimen size on the distribution of deformation during torsion test. For this purpose, computer simulation of the torsion testing process was performed. The influence of the relative length of the specimen gauge on the deviation of the actual values of the effective strain from the calculated values was quantified. It is shown that the error in the calculation of the effective strain, based on the values of the twist angle and the specimen gauge size, is of 4%. In order to verify the results obtained by computer simulation, the physical simulation was performed. It is shown that the distribution of deformation along the length of the specimen gauge is also significantly influenced by the accuracy of specimen manufacture, as well as the specimen material. In some cases, the error in the calculation of the effective strain, based on the values of the twist angle and the specimen gauge size, can reach more than 80%.

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Examination of Hardening Curves Definition Methods in Torsion Test

Cited by 8 publications

References 10 publications

The Method of Testing Cylindrical Specimen for Torsion in Order to Determine the Rheological Properties of Materials Sensitive to the Strain Rate

The Method of Testing Cylindrical Specimen for Torsion in Order to Determine the Rheological Properties of Materials Sensitive to the Strain Rate

Computer Simulation of the Torsion Testing Method with Variable Grip’s Acceleration

The Influence of Cylindrical Specimen Size and Material Properties on the Distribution of Deformation during Torsion Test

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