Atomistic calculation of size effects on elastic coefficients in nanometre-sized tungsten layers and wires

Size effects on the Mechanical Behavior of Nanometric W/Cu Multilayers

“…Simulated tensile testing of self-supported single-crystal film of W have revealed a Young's modulus softening coupled with a strengthening of the Poisson's ratio. This effect becomes larger when monocrystalline layer thickness decreases under 2 nm [15]. These first results are qualitatively consistent with experimental measurements.…”

Stress and displacement configurations in the vicinity of a void in a nanometer copper strip

“…The size effects on Young's modulus observed in experiments have also been seen in computer simulations which also have reported size effects on Poisson's ratio [21][22][23]. Furthermore, computer simulations have also observed that strain rate influences the elastic response [24][25][26].…”

Grain Size Dependence of Elastic Moduli in Nanocrystalline Tungsten

“…Among bcc transition metals, tungsten offers particularly interesting applications in the microelectronic domain and to our knowledge, the elastic constants of nanocrystalline tungsten have not been studied yet. In a previous study [23] we have shown that surface effects can strongly influence the elastic properties of thin tungsten …”

“…As in our previous study [23], we used a Finnis-Sinclair type potential parametrised for tungsten by Ackland and Thetford [24,25] that correctly reproduces interactions with surfaces, even at a nanometre scale. The simulation itself used cubic cells (referred below as "samples") divided by means of a Voronoi method and repeated by periodic boundary conditions.…”