Particulate size effects in the particle-reinforced metal-matrix composites |
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Authors: | Wei Yueguang |
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Institution: | (1) LNM, Institute of Mechanics, Chinese Academy of Sciences, 100080 Beijing, China |
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Abstract: | The influences of particle size on the mechanical properties of the particulate metal matrix composite are obviously displayed
in the experimental observations. However, the phenomenon can not be predicted directly using the conventional elastic-plastic
theory. It is because that no length scale parameters are involved in the conventional theory. In the present research, using
the strain gradient plasticity theory, a systematic research of the particle size effect in the particulate metal matrix composite
is carried out. The roles of many composite factors, such as: the particle size, the Young's modulus of the particle, the
particle aspect ratio and volume fraction, as well as the plastic strain hardening exponent of the matrix material, are studied
in detail. In order to obtain a general understanding for the composite behavior, two kinds of particle shapes, ellipsoid
and cylinder, are considered to check the strength dependence of the smooth or non-smooth particle surface. Finally, the prediction
results will be applied to the several experiments about the ceramic particle-reinforced metal-matrix composites. The material
length scale parameter is predicted.
The project supported by the National Natural Science Foundation of China (19891180, 19925211) and by the Chinese Academy
of Sciences (KJ951-1-201) and “Bai Ren” plan |
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Keywords: | size effect strain gradient plasticity the particle-reinforced metalmatrix composite |
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