Plasticity of isotropic composites with randomly oriented and packeted inclusions |
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Institution: | 1. School of Mechanical Engineering, University of Campinas Brazil, FEM-UNICAMP Rua Mendeleyev, 200, Cidade Universitária Zeferino Vaz CEP 13083-860, Campinas, SP Brazil;2. School of Civil Engineering, Architecture and Urbanism, Universitya of Campinas Brazil, FEC-UNICAMP Rua Saturnino de Brito, 224, Cidade Universitária Zeferino Vaz CEP 13083-889, Campinas, SP Brazil;3. School of Mechanical Engineering, University of Campinas Brazil FEM-UNICAMP and CCES – Center for Computational Engineering and Sciences, Campinas, SP, Brazil |
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Abstract: | Based on an energy approach, the nonlinear elastoplastic behavior of a two-phase, isotropic composite with two kinds of inclusion morphologies are determined as a function of inclusion shape at the low concentration range. Both types of morphology involve the three-dimensional randomly oriented spheroidal inclusions, but one is homogeneously dispersed, resulting in an ordinary two-phase composite, and the other possesses a packeted structure in a form similar to a polycrystalline arrangement. The overall elastoplastic response of these two kinds of composite is found to be strongly dependent upon the inclusion shape and their morphological arrangement. Disc-shaped inclusions generally give a superior reinforcing effect, but when the inclusions become very stiff or totally rigid, needle-shaped inclusions tend to be more effective. In line with the known elastic behavior, the overall elastoplastic response of an ordinary two-phase composite is markedly stiffer than that of the packeted composite at a given inclusion shape and concentration. The theory is finally compared with the finite-element calculations of a particle-reinforced composite and of a packeted one with oblate and prolate inclusions, and also with some experimental data for a silicon-carbide/aluminium system. In both cases, reasonable agreement is found in the comparison. |
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