Effects of particle plasticity characteristics on local interface stress in particle reinforced composite during uniaxial tension |
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Authors: | H M Xu G Q Wu and W Sha |
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Affiliation: | (1) School of Materials Science and Engineering, Beihang University, Beijing, 100083, China;(2) School of Planning, Architecture and Civil Engineering, Queen’s University Belfast, Belfast, BT7 1NN, UK; |
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Abstract: | For elastoplastic particle reinforced metal matrix composites, failure may originate from interface debonding between the
particles and the matrix, both elastoplastic and matrix fracture near the interface. To calculate the stress and strain distribution
in these regions, a single reinforcing particle axisymmetric unit cell model is used in this article. The nodes at the interface
of the particle and the matrix are tied. The development of interfacial decohesion is not modelled. Finite element modelling
is used, to reveal the effects of particle strain hardening rate, yield stress and elastic modulus on the interfacial traction
vector (or stress vector), interface deformation and the stress distribution within the unit cell, when the composite is under
uniaxial tension. The results show that the stress distribution and the interface deformation are sensitive to the strain
hardening rate and the yield stress of the particle. With increasing particle strain hardening rate and yield stress, the
interfacial traction vector and internal stress distribution vary in larger ranges, the maximum interfacial traction vector
and the maximum internal stress both increase, while the interface deformation decreases. In contrast, the particle elastic
modulus has little effect on the interfacial traction vector, internal stress and interface deformation. |
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