Abstract
Scale difference of interface strength is discussed based on results obtained by two genuine particle methods. Microscopic method is molecular dynamics (MD) method, and another, microscopic one, is smoothed particle hydrodynamics (SPH) method. Our materials interface model is constructed as bi-material (aluminum, steel, or copper) composite with flat joint surrounded by free surfaces. In SPH analysis, three-dimensional elastic constitutive relation is built in, with employing two kinds of macroscopic materials constants. MD analysis is constructed by simple Lennard-Jones potential. In spite of difference in size, both particle methods can reproduce adequate characteristics of stress concentration along interface theoretically predicted in elastic regime. It is found that in SPH method tensile stress is transmitted with oscillation, and this will offer nice matching with molecular vibration in MD method.
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