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A study on the plastic properties of unidirectional nanocomposites with interface energy effects

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Abstract

In this paper, for obtaining an overall size-dependent yield function for nanocomposites containing aligned cylindrical nanofibers, the effects of interface residual stress and interface elasticity are taken into account within a micromechanical framework. Toward this goal, the modified Hill’s condition is used, and then, in order to consider effects of the interface residual stress, strains are decomposed into two parts, a part due to the external loadings and the other due to the interface residual stress. Next, utilizing the field fluctuation method, an overall yield function containing effective elastic constants of the material is derived and then simplified for practical loading conditions. Moreover, a secant modulus scheme is adopted to examine the overall nonlinear behavior of the material in plastic deformation. Finally, by some numerical examples, it is shown that the interface stress, including the interface residual stress, makes the yield strength and plastic deformation of the metal matrix nanocomposites dependent on the nanofiber size, in contrast to the classical results.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran

    A. F. Moshtaghin, R. Naghdabadi & M. Asghari

  2. Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran, Iran

    R. Naghdabadi

Authors
  1. A. F. Moshtaghin
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  2. R. Naghdabadi
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  3. M. Asghari
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Correspondence to R. Naghdabadi.

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Moshtaghin, A.F., Naghdabadi, R. & Asghari, M. A study on the plastic properties of unidirectional nanocomposites with interface energy effects. Acta Mech 224, 789–809 (2013). https://doi.org/10.1007/s00707-012-0780-3

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  • DOI: https://doi.org/10.1007/s00707-012-0780-3

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