By a News Reporter-Staff News Editor at Journal of Engineering -- Researchers detail new data in Computational Engineering. According to news originating from Tehran, Iran, by VerticalNews correspondents, research stated, "In nano-structures, the influence of surface effects on the properties of material is highly important because the ratio of surface to volume at the nano-scale level is much higher than that of the macro-scale level. In this paper, a novel temperature-dependent multi-scale model is presented based on the modified boundary Cauchy-Born (MBCB) technique to model the surface, edge, and corner effects in nano-scale materials."
Our news journalists obtained a quote from the research from the Sharif University of Technology, "The Lagrangian finite element formulation is incorporated into the heat transfer analysis to develop the thermo-mechanical finite element model. The temperature-related Cauchy-Born hypothesis is implemented by using the Helmholtz free energy to evaluate the temperature effect in the atomistic level. The thermo-mechanical multi-scale model is applied to determine the temperature related characteristics at the nano-scale level. The first and second derivatives of free energy density are computed using the first Piola-Kirchhoff stress and tangential stiffness tensor at the macro-scale level. The concept of MBCB is introduced to capture the surface, edge, and corner effects. The salient point of MBCB model is the definition of radial quadrature used at the surface, edge, and corner elements as an indicator of material behavior. The characteristics of quadrature are derived by interpolating the data from the atomic level laid in a circular support around the quadrature in a least-square approach."
According to the news editors, the research concluded: "Finally, numerical examples are modeled using the proposed computational algorithm, and the results are compared with the fully atomistic model to illustrate the performance of MBCB multi-scale model in the thermo-mechanical analysis of metallic nano-scale devices."
For more information on this research see: Multi-scale modeling of surface effects in nano-materials with temperature-related Cauchy-Born hypothesis via the modified boundary Cauchy-Born model. International Journal for Numerical Methods in Engineering, 2014;97(2):79-110. International Journal for Numerical Methods in Engineering can be contacted at: Wiley-Blackwell, 111 River St, Hoboken 07030-5774, NJ, USA. (Wiley-Blackwell - www.wiley.com/; International Journal for Numerical Methods in Engineering - onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-0207)
The news correspondents report that additional information may be obtained from A.R. Khoei, Sharif Univ Technol, Dept. of Civil Engn, Center Excellence Struct & Earthquake Engn, Tehran, Iran. Additional authors for this research include P. Ghahremani and H. DorMohammadi.
Keywords for this news article include: Iran, Asia, Tehran, Computational Engineering
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