The Voigt bound of the stress potential of isotropic viscoplastic FCC polycrystals

• Autorzy: Bohlke T.
• Konferencja: International Symposium on Developments in Plasticity and Fracture (2004 ; Kraków)
• Języki publikacji: EN

Abstrakty

EN

The Voigt bound of the stress potential of face-centered cubic (fcc) polycrystals without texture is numerically determined for all types of strain rate states. The numerical findings reveal the dependence of the stress potential on both the second and the third principal invariant of the strain rate deviator. The dependence on the determinant vanishes only for a linear viscoplastic behavior. Due to the dependence of the stress potential on the third principal invariant, the determinant, the viscoplastic flow is generally nonproportional to the stress deviator. A simple analytical expression is found, which reproduces the numerical findings over the full range of strain rate sensitivities.

Słowa kluczowe

EN

polycrystal; isotropic viscoplastic face-centered cubic polycrystal; Reuss bound; Voigt bound; stress potential; Taylor factor; stress rate potential

PL

polikryształ; izotropowy, lepko-sprężysty, regularny ściennie centrowany polikryształ; potencjał naprężenia; współczynnik Taylora; potencjał prędkości odkształcenia

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Archives of Mechanics
• Rocznik: 2004
• Tom: Vol. 56, nr 6
• Strony: 425--445
• Opis fizyczny: Bibliogr. 42 poz., rys.

Twórcy

autor

Bohlke T.

• Otto-von Guericke-Universitat Magdeburg, Institut fur Mechanik, PSF 4120, D-39016 Magdeburg,

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