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Influence of specimen dimensions and strain measurement methods on tensile stress-strain curves

Influence of specimen dimensions and strain measurement methods on tensile stress-strain curves
Influence of specimen dimensions and strain measurement methods on tensile stress-strain curves
Miniature tensile specimens, having various sizes and geometries, are often used to measure the mechanical properties of bulk nanostructured materials. However, these samples are generally too small for use with conventional extensometers so that the strains are usually calculated from the crosshead displacements. This study uses experimental results and finite element modeling (FEM) to critically evaluate the influence of the specimen dimensions and strain measurement methods on the tensile curves obtained from miniature specimens. Using coarse-grained Cu as a model material, the results demonstrate that the values of strain obtained from the crosshead displacement are critically influenced by the specimen dimensions such that the uniform elongation and the post-necking elongation both increase with decreasing gauge length and increasing specimen thickness. The results provide guidance on the optimum procedures for the tensile testing of miniature specimens of both coarse-grained and nanostructured materials
strain measurements, tensile testing, finite element modeling (FEM), miniature specimens, stress–strain curves
0921-5093
68-77
Zhao, Y.H.
4fea315b-8c7d-4bb1-badc-236b309ef228
Guo, Y.Z.
f0924ae5-ca96-46df-8c49-24754247c007
Wei, Q.
37a85d24-59da-4017-9add-963d999a2588
Topping, T.D.
6c309684-58bb-4c87-8494-2363ffa1c8d4
Danglewicz, A.M.
b8bcff35-f493-424d-8209-0be6d2d50394
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lavernia, E.J
00ba1a0a-c3ee-4b62-80b9-948557360ba1
Zhao, Y.H.
4fea315b-8c7d-4bb1-badc-236b309ef228
Guo, Y.Z.
f0924ae5-ca96-46df-8c49-24754247c007
Wei, Q.
37a85d24-59da-4017-9add-963d999a2588
Topping, T.D.
6c309684-58bb-4c87-8494-2363ffa1c8d4
Danglewicz, A.M.
b8bcff35-f493-424d-8209-0be6d2d50394
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lavernia, E.J
00ba1a0a-c3ee-4b62-80b9-948557360ba1

Zhao, Y.H., Guo, Y.Z., Wei, Q., Topping, T.D., Danglewicz, A.M., Zhu, Y.T., Langdon, T.G. and Lavernia, E.J (2009) Influence of specimen dimensions and strain measurement methods on tensile stress-strain curves. Materials Science and Engineering: A, 525 (1-2), 68-77. (doi:10.1016/j.msea.2009.06.031).

Record type: Article

Abstract

Miniature tensile specimens, having various sizes and geometries, are often used to measure the mechanical properties of bulk nanostructured materials. However, these samples are generally too small for use with conventional extensometers so that the strains are usually calculated from the crosshead displacements. This study uses experimental results and finite element modeling (FEM) to critically evaluate the influence of the specimen dimensions and strain measurement methods on the tensile curves obtained from miniature specimens. Using coarse-grained Cu as a model material, the results demonstrate that the values of strain obtained from the crosshead displacement are critically influenced by the specimen dimensions such that the uniform elongation and the post-necking elongation both increase with decreasing gauge length and increasing specimen thickness. The results provide guidance on the optimum procedures for the tensile testing of miniature specimens of both coarse-grained and nanostructured materials

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More information

Published date: 15 November 2009
Keywords: strain measurements, tensile testing, finite element modeling (FEM), miniature specimens, stress–strain curves
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 72333
URI: https://eprints.soton.ac.uk/id/eprint/72333
ISSN: 0921-5093
PURE UUID: bbbbb8b8-b9c3-416c-b539-91eda1b19a5b
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 09 Feb 2010
Last modified: 06 Jun 2018 12:48

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Contributors

Author: Y.H. Zhao
Author: Y.Z. Guo
Author: Q. Wei
Author: T.D. Topping
Author: A.M. Danglewicz
Author: Y.T. Zhu
Author: T.G. Langdon ORCID iD
Author: E.J Lavernia

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