TY - JOUR
T1 - Predicting the constitutive behavior of semi-solids via a direct finite element simulation
T2 - Application to AA5182
AU - Phillion, A. B.
AU - Cockcroft, S. L.
AU - Lee, P. D.
PY - 2009
Y1 - 2009
N2 - The methodology of direct finite element (FE) simulation was used to predict the semi-solid constitutive behavior of an industrially important aluminum-magnesium alloy, AA5182. Model microstructures were generated that detail key features of the as-cast semi-solid: equiaxed-globular grains of random size and shape, interconnected liquid films, and pores at the triple-junctions. Based on the results of over fifty different simulations, a model-based constitutive relationship which includes the effects of the key microstructure features - fraction solid, grain size and fraction porosity - was derived using regression analysis. This novel constitutive equation was then validated via comparison with both the FE simulations and experimental stress/strain data. Such an equation can now be used to incorporate the effects of microstructure on the bulk semi-solid flow stress within a macro- scale process model.
AB - The methodology of direct finite element (FE) simulation was used to predict the semi-solid constitutive behavior of an industrially important aluminum-magnesium alloy, AA5182. Model microstructures were generated that detail key features of the as-cast semi-solid: equiaxed-globular grains of random size and shape, interconnected liquid films, and pores at the triple-junctions. Based on the results of over fifty different simulations, a model-based constitutive relationship which includes the effects of the key microstructure features - fraction solid, grain size and fraction porosity - was derived using regression analysis. This novel constitutive equation was then validated via comparison with both the FE simulations and experimental stress/strain data. Such an equation can now be used to incorporate the effects of microstructure on the bulk semi-solid flow stress within a macro- scale process model.
UR - http://www.scopus.com/inward/record.url?scp=70350680098&partnerID=8YFLogxK
U2 - 10.1088/0965-0393/17/5/055011
DO - 10.1088/0965-0393/17/5/055011
M3 - Article
AN - SCOPUS:70350680098
SN - 0965-0393
VL - 17
JO - Modelling and Simulation in Materials Science and Engineering
JF - Modelling and Simulation in Materials Science and Engineering
IS - 5
M1 - 055011
ER -