Determination of the flow stress model of AZ80 Mg alloy

• Autorzy: Tokunaga T. , Kuziak R. , Matsuura K.

Warianty tytułu

PL

Wyznaczanie modelu naprężenia uplastyczniającego dla stopu magnezu AZ80

• Języki publikacji: EN

Abstrakty

EN

The flow stress model of AZ80 Mg alloy, whose grain size is approximately 30 μm, is created by interpreting the experimental results with the inverse analysis. Compression tests were conducted at temperatures of 523, 573 and 623 K and at strain rates of 0.01, 0.1 and 1 s"'. On the basis of the test results, the flow stress model of the Mg alloy was determined. As candidates of the flow stress model, three equations were selected and the coefficients in those equations were determined by using the inverse analysis and optimization process. In the optimization process, the measured and calculated loads were compared and the difference between them was minimized as objective functions. Consequently, the flow stress equation was chosen and the coefficients were determined. Reasonably good agreements of measured and calculated results were obtained with the equation which can be taken into account not only the softening but also the saturation of the flow stress due to the dynamic recrystallization.

PL

Model naprężenia dla stopu magnezu AZ80 o wielkość ziarna około 30 μm opracowano na podstawie interpretacji: danych doświadczalnych za pomocą rozwiązania odwrotnego. Próby ściskania próbek osiowosymetrycznych przeprowadzone w temperaturach 523, 573 i 623 K z prędkościami odkształcenia 0.01, 0.1 i 1 s'. Uzyskane wyniki posłużyły do opracowania modelu. Przy budowie modelu wybrano trzy równania i współczynniki w tych równaniach wyznaczono za pomocą rozwiązania odwrotnego. W procedurze optymalizacyjnej porównywane zmierzone i obliczone siły a różnica między nimi była minimalizowana jako funkcja celu. W konsekwencji wybrano równanie najlepiej opisujące zachowanie się materiału i wyznaczono współczynniki w tym równaniu. Równanie to uwzględnia zarówno umocnienie materiału jak i mięknięcie w wyniku dynamicznej rekrystalizacji oraz stan ustalony przy większych odkształceniach. Uzyskano dobrą zgodność między obliczonymi i zmierzonymi siłami w próbie ściskania.

Słowa kluczowe

EN

computer simulation; inverse analysis; plastic deformation

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2014
• Tom: Vol. 14, No. 2
• Strony: 123--130
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Tokunaga T.

• Research Fellow of Japan Society for the Promotion of Science, PhD student, Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan

autor

Kuziak R.

• Institute for Ferrous Metallurgy, Gliwice, Poland

autor

Matsuura K.

• Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan

Bibliografia

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