Summary
A kinematic hardening model is generalized by introducing plastic and viscous residual “back” stresses α, β that govern the translation of the yield surface. The evolution equations for α and β are proposed and the material functions are identified for a construction steel by carrying out tension-compression tests at different strain rates. The cyclic tests with changing strain amplitudes and frequencies are next carried out and model predictions are compared with experimental results.
Zusammenfassung
Ein Modell mit kinetmatischer Verfestigung wird durch die Einführung plastischer und viskoser bleibender “Hintergrundspannungen” α, β verallgemeinert, die die Bewegungen der Fließfläche steuern. Die Wachstumsgleichungen für α und β werden aufgestellt und die Materialfunktionen für einen Baustahl aus Zug-Druckversuchen mit verschiedener Dehnungsrate bestimmt. Die zyklischen Versuche mit sich ändernden Dehnungsamplituden und Fequenzen werden als nächstes durchgeführt und die Modellaussagen mit den experimentellen Ergebnissen verglichen.
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Kujawski, D., Mróz, Z. A viscoplastic material model and its application to cyclic loading. Acta Mechanica 36, 213–230 (1980). https://doi.org/10.1007/BF01214633
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DOI: https://doi.org/10.1007/BF01214633