Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals

The International Organization for Standardization Technical Committee for Metallic Materials—Tensile Testing stated in 2011 that temperature and strain rate variations would induce a change in the results of tensile tests, termed as the measurement uncertainty of tensile mechanical properties in me...

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Autores principales:	Tingdong Xu, Kai Wang, Shenhua Song
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	measurement uncertainty mechanical properties metals embrittlement grain boundary segregation ductility Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/eaf2aa62b7dc4784a877dcbcbfe71572
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spelling	oai:doaj.org-article:eaf2aa62b7dc4784a877dcbcbfe715722021-11-25T18:21:33ZMeasurement Uncertainty and Representation of Tensile Mechanical Properties in Metals10.3390/met111117332075-4701https://doaj.org/article/eaf2aa62b7dc4784a877dcbcbfe715722021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1733https://doaj.org/toc/2075-4701The International Organization for Standardization Technical Committee for Metallic Materials—Tensile Testing stated in 2011 that temperature and strain rate variations would induce a change in the results of tensile tests, termed as the measurement uncertainty of tensile mechanical properties in metals. The uncertainty means that the tensile testing results of a specimen at a temperature and strain rate are not the original mechanical properties possessed prior to the testing. Hence, since the time of Galileo the results of tensile testing have been incorrectly interpreted as the original mechanical properties of specimens, thereby forming a paradox. At the turn of the 21st century, the micro-theory of metallic elastic deformation was proposed, identifying that a change in microstructure at atomic level could occur during elastic deformation, leading to a change in the concentration of solute (impurity) at grain boundaries/around dislocations. The micro-theory has been used to explain the mechanism of the measurement uncertainty. Different tensile temperatures and strain rates correspond to different durations of elastic deformation during tensile testing, different concentrations of solute at grain boundaries/dislocations, and thus different mechanical properties. On this basis, a new technology system of tensile testing is suggested, i.e., a “mechanical property–tensile strain rate” curve at a given test temperature can be used to evaluate the original mechanical property. The higher the strain rate is, the closer the property on the curve is to the original property. Therefore, to determine the original mechanical property of the tested metal, a sufficiently high strain rate is required. The curve can also characterize the property variation of the tested metal in service with the service time. In addition, the property characterized by a point on the curve can represent the property of the tested metal when processing-deformed with the corresponding strain rate. As an example of the application of the new technology system, the property of high-entropy alloys is represented with a curve. The results show that the new technology system could change the conceptual framework and testing technology system of metallic mechanics.Tingdong XuKai WangShenhua SongMDPI AGarticlemeasurement uncertaintymechanical propertiesmetalsembrittlementgrain boundary segregationductilityMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1733, p 1733 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	measurement uncertainty mechanical properties metals embrittlement grain boundary segregation ductility Mining engineering. Metallurgy TN1-997
spellingShingle	measurement uncertainty mechanical properties metals embrittlement grain boundary segregation ductility Mining engineering. Metallurgy TN1-997 Tingdong Xu Kai Wang Shenhua Song Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals
description	The International Organization for Standardization Technical Committee for Metallic Materials—Tensile Testing stated in 2011 that temperature and strain rate variations would induce a change in the results of tensile tests, termed as the measurement uncertainty of tensile mechanical properties in metals. The uncertainty means that the tensile testing results of a specimen at a temperature and strain rate are not the original mechanical properties possessed prior to the testing. Hence, since the time of Galileo the results of tensile testing have been incorrectly interpreted as the original mechanical properties of specimens, thereby forming a paradox. At the turn of the 21st century, the micro-theory of metallic elastic deformation was proposed, identifying that a change in microstructure at atomic level could occur during elastic deformation, leading to a change in the concentration of solute (impurity) at grain boundaries/around dislocations. The micro-theory has been used to explain the mechanism of the measurement uncertainty. Different tensile temperatures and strain rates correspond to different durations of elastic deformation during tensile testing, different concentrations of solute at grain boundaries/dislocations, and thus different mechanical properties. On this basis, a new technology system of tensile testing is suggested, i.e., a “mechanical property–tensile strain rate” curve at a given test temperature can be used to evaluate the original mechanical property. The higher the strain rate is, the closer the property on the curve is to the original property. Therefore, to determine the original mechanical property of the tested metal, a sufficiently high strain rate is required. The curve can also characterize the property variation of the tested metal in service with the service time. In addition, the property characterized by a point on the curve can represent the property of the tested metal when processing-deformed with the corresponding strain rate. As an example of the application of the new technology system, the property of high-entropy alloys is represented with a curve. The results show that the new technology system could change the conceptual framework and testing technology system of metallic mechanics.
format	article
author	Tingdong Xu Kai Wang Shenhua Song
author_facet	Tingdong Xu Kai Wang Shenhua Song
author_sort	Tingdong Xu
title	Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals
title_short	Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals
title_full	Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals
title_fullStr	Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals
title_full_unstemmed	Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals
title_sort	measurement uncertainty and representation of tensile mechanical properties in metals
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/eaf2aa62b7dc4784a877dcbcbfe71572
work_keys_str_mv	AT tingdongxu measurementuncertaintyandrepresentationoftensilemechanicalpropertiesinmetals AT kaiwang measurementuncertaintyandrepresentationoftensilemechanicalpropertiesinmetals AT shenhuasong measurementuncertaintyandrepresentationoftensilemechanicalpropertiesinmetals
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Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals

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