ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 9

Accurate Measurement of Flow Stress Curves at High Temperatures for Low Strain Ranges

Carmona, R
Research assistant, MPhil student, and professors, IMMPE-TUS—Institute for Microstructural and Mechanical Process Engineering, The University of Sheffield, Sheffield,

Lacey, AJ
Research assistant, MPhil student, and professors, IMMPE-TUS—Institute for Microstructural and Mechanical Process Engineering, The University of Sheffield, Sheffield,

Beynon, JH
Research assistant, MPhil student, and professors, IMMPE-TUS—Institute for Microstructural and Mechanical Process Engineering, The University of Sheffield, Sheffield,

Sellars, CM
Research assistant, MPhil student, and professors, IMMPE-TUS—Institute for Microstructural and Mechanical Process Engineering, The University of Sheffield, Sheffield,

(Received 11 September 2000; accepted 23 May 2001)

Abstract

The present paper reports a comparison of flow stresses obtained by tension, plane strain compression, and axisymmetric compression testing in different machines with or without extensometers in the gage length section. Flow stress curves obtained from different test systems suggest machine and specimen geometry dependence, when the strain is computed based on gross specimen deformation. Finite element simulations give some insight into the interpretation and use of each mechanical testing technique, revealing the distribution of the strain field in each case. The results show that careful calibration of every testing machine and, in some cases, finite element modeling of the tests, are essential to give a similar curve for the same nominal deformation conditions.

Keywords:
high temperature, tensile testing, axisymmetric compression testing, plane strain compression testing, small strain, finite element modeling, aluminum alloys

Paper ID: JTE12397J
DOI: 10.1520/JTE12397J
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