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Nonlocal modeling of deformation and damage behavior of an inhomogeneous interphase in nano-particle supercrystals

By Ingo Scheider (Helmholtz-Zentrum Geesthacht)
Co-authors: Songyun Ma (RWTH Aachen)
Swantje Bargmann (Bergische Universit├Ąt Wuppertal)

A novel nano-particle composite synthesized by bio-inspired design has been fabricated, which shows extraordinary mechanical characteristics due to the well-organized arrangement of soft and hard constituents in the microstructure. For this material, the inhomogeneous interphases surrounding the nano-particles play an important role in the mechanical performance of nano-composite. In order to describe this material on the nano-scale, particularly the interphase region, a nonlocal material model based on micropolar theory is proposed. The new model is able to account for the scale of microstructure and describe the inelastic behavior, namely damage and plasticity, of interphases with gradient material properties. Micromechanical simulations are performed to investigate the relationship between nanostructures and mechanical properties of nanocomposites. The proposed damage model is validated by 3D micromechanical simulations for the nanoparticle super-crystals fabricated at different temperatures. The simulation results are in good agreement with the experimental data from micro-cantilever beams in terms of the stiffness, tensile strength and fracture energy absorption of the nanocomposites.

Ⓒ Photos:Toerisme Leuven