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Description of the flow behaviour of a high strength austenitic steel under biaxial loading by a constitutive equation.

Beschreibung des Fließverhaltens eines hochfesten austenitischen Stahles unter zweiachsiger Belastung durch eine konstitutive Gleichung
: El-Magd, E.; Kunze, H.-D.; Stiebler, K.

Nuclear Engineering and Design 127 (1991), No.1, pp.85-93
ISSN: 0029-5493
Journal Article
Fraunhofer IFAM ()
austenitic steel; austenitischer Stahl; biaxial loading; constitutive equation; Fließverhalten; flow behaviour; high strain rate; hohe Dehnungsgeschwindigkeit; konstitutive Gleichung; zweiachsige Belastung

Uniaxial and biaxial tension-torsion tests were carried out on a high strength austenitic steel at room temperature in the strain rate range from 10highminus5 to 10high2 shighminus1. This material shows a strong dependence of strength on strain rate. The yield loci of the combined tests are described by ellipses. The size and the shape of these ellipses are functions of strain and strain rate. The quasistatic and dynamic tension-torsion behaviour of the austenitic steel is described by Perzyna's constitutive equation. There is good agreement between measured and calculated results if a yield criterion as a function of strain and strain rate, and a formula which contains the dependence of flow stress on strain rate based on thermal activation, are included.