Yield stress of SiC reinforced aluminum alloy composites |
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Authors: | Min Song Yuehui He and Shanfeng Fang |
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Affiliation: | (1) State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People’s Republic of China |
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Abstract: | This article develops a constitutive model for the yield stress of SiC reinforced aluminum alloy composites based on the modified
shear lag model, Eshelby’s equivalent inclusion approach, and Weibull statistics. The SiC particle debonding and cracking
during deformation have been incorporated into the model. It has been shown that the yield stress of the composites increases
as the volume fraction and aspect ratio of the SiC particles increase, while it decreases as the size of the SiC particles
increases. Four types of aluminum alloys, including pure aluminum, Al–Mg–Si alloy, Al–Cu–Mg alloy, and Al–Zn–Mg alloy, have
been chosen as the matrix materials to verify the model accuracy. The comparisons between the model predictions and the experimental
counterparts indicate that the present model predictions agree much better with the experimental data than the traditional
modified shear lag model predictions. The present model indicates that particle failure has important effect on the yield
stress of the SiC reinforced aluminum alloy composites. |
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Keywords: | |
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