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.
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