Nowacki's double shear test in the framework of the anisotropic thermo-elasto-viscoplastic material model

Glema, A.; Łodygowski, T.; Sumelka, W.

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Tytuł artykułu

Nowacki's double shear test in the framework of the anisotropic thermo-elasto-viscoplastic material model

Autorzy

Glema A. , Łodygowski T. , Sumelka W.

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In the paper, the numerical simulation of Nowacki's double shear test in the framework of recently proposed viscoplasticity theory for anisotropic solids is presented. The numerical analysis comprises the full spatial modelling and is carried out for the DH-36 steel sheet in adiabatic conditions (the analysis of anisotropic bodies can be led only on 3D models). During analyses, strain rates of order 10⁴-10⁷ s^-1 are observed and the process time duration up to full damage (loss of continuity in the localisation zone) is around 150-300 žs. The novelty of the research is focused on the formulation that includes the anisotropy of the intrinsic microdamage process. Thus, it makes possible to obtain qualitatively and quantitatively new results compared with the existing models, like tracing the softening directions and better (closer to experiment) prediction of damage paths.

W pracy przedstawiono numeryczne symulacje testu podwojnego ścinania, zaproponowanego przez prof. Nowackiego, w ramach sformułowania teorii lepkoplastyczności dla anizotropowych ciał stałych. Analizy numeryczne obejmują modele trójwymiarowe i są wykonane dla stali DH-36 w warunkach adiabatycznych (analiza ciał anizotropowych może być przeprowadzona wyłącznie na modelach trojwymiarowych). W trakcie analiz obserwuje się prędkości deformacji rzędu 10⁴-10⁷ s^-1, a czas trwania procesu do całkowitego zerwania próbki (utraty ciągłości w strefie lokalizacji) jest z przedziału 150-300 žs. Oryginalność badań wynika z faktu uwzględnienia w definicji konstytutywnego modelu anizotropowego wewnętrznego procesu mikrouszkodzeń. W rezultacie, uzyskane wyniki dają jakościowo i ilościowo nowy obraz procesu, w szczegolności umożliwiają śledzenie kierunkow osłabienia oraz dokładniejsze (bliższe rezultatom eksperymentalnym) odwzorowanie ścieżki zniszczenia.

Słowa kluczowe

microdamage anisotropy metals constitutive relation

Wydawca

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Czasopismo

Journal of Theoretical and Applied Mechanics

Rocznik

2010

Tom

Vol. 48 nr 4

Strony

973--1001

Opis fizyczny

Bibliogr. 52 poz., rys.

Twórcy

autor

Glema A.

autor

Łodygowski T.

autor

Sumelka W.

Poznan University of Technology, Faculty of Civil and Environmental Engineering, Poznań, Poland, adam.glema@put.poznan.pl

Bibliografia

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