Flow Stress Numerical Modeling for Large Strain Deformation in Magnesium

• Autorzy: De Pari L., Jr , Misiolek W. Z. , Forsmark J. H. , Luo A. A.

Warianty tytułu

PL

Numeryczne modelowanie naprężenia odkształcającego w przypadku dużych odkształceń w stopie magnezu AZ 31

• Języki publikacji: EN

Abstrakty

EN

An existing flow stress model proposed by Barnett was examined with as-cast homogenized AZ31 compression test data for a range of temperatures (250-450 centigrade) and strain rates (0.001-20s-1) from literature to verify the applicability of the model to direct extrusion of AZ31. The model was successful in predicting the hardening region of the flow curve but was unable to simulate the sizable softening component of the flow curve that as-cast homogenized magnesium alloys tend to have before failure. In order to correct this shortcoming, an empirical softening expression was developed with the same range of temperatures and strain rates. This modified flow stress model was then implemented into the finite element software package DEFORMTM 3-D to examine the hot-direct extrusion of hollow AZ31 automobile structural components fabricated using a port-hole die.

PL

Istniejący model naprężenia uplastyczniającego zaproponowany przez Barnetta został przeanalizowany używając danych z literatury dla odlanego i homogenizowanego stopu AZ31 poddanego próbom ściskania w zakresie temperatur od 250 do 450 centigrade i prędkości odkształcenia od 0.001 do 20 s-1. Analizę te przeprowadzono w celu zwerifikowania czy model ten nadaje się do zastosowania do procesu wyciskania współbieżnego stopu AZ31. Model ten sprawdził się w przewidywaniu krzywej umocnienia lecz nie był w stanie przewidzieć znaczącego zmiękczenia materiału typowego dla odlanego i homogenizowanego stopu magnezu tuz przed pęknięciem. W celu poprawienia tego limitującego faktu opracowano poprawkę dla tego zakresu temperatur i prędkości odkształcenia. Ten zmodyfikowany model naprężenia uplastyczniającego został następnie zastosowany w programie elementów skończonych DETORM™ 3-D w celu analizy wy ciskania współbieżnego na gorąco przez matryce mostkowa profilu ze stopu AZ31.

Słowa kluczowe

EN

magnesium alloys; thermo-mechanical processing; extrusion; recovery; flow stress; numerical simulation

• Wydawca: Wydawnictwa AGH
• Czasopismo: Computer Methods in Materials Science
• Rocznik: 2010
• Tom: Vol. 10, No. 2
• Strony: 108--129
• Opis fizyczny: Bibliogr. 40 poz., rys.

Twórcy

autor

De Pari L., Jr

autor

Misiolek W. Z.

autor

Forsmark J. H.

autor

Luo A. A.

• Institute for Metal Forming, Lehigh University, Bethlehem, PA, USA,

Bibliografia

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