Dresden 2009 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 20: Poster Session I
MM 20.17: Poster
Tuesday, March 24, 2009, 14:45–16:30, P4
Modelling particulate self-healing materials and application to uni-axial compression — •Olaf Herbst1,2, Akke Suiker1, and Stefan Luding2 — 1Aerospace Engineering, TU Delft, Kluyverweg 1, 2629 HS Delft, The Netherlands — 22Multi Scale Mechanics, TS, CTW, UTwente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Using an advanced history dependent contact model for DEM simulations, including elasto-plasticity, viscosity, adhesion, and friction, pressure-sintered tablets are formed from primary particles. These tablets are subjected to uni-axial compression until and beyond failure displaying peak strength. For fast and slow deformation we observe ductile-like and brittle softening, respectively.
We propose a model for local self-healing that allows damage to heal during the loading process such that the material strength of the sample increases and failure/softening is delayed to larger strain. Local healing is achieved by increasing the (attractive) contact adhesion forces for those particles involved in a potentially breaking contact.
We examine the dependence of the strength of the material on (a) the damage detection sensitivity, (b) the damage detection rate, and (c) the (increased) adhesion between healed contacts. The material strength is enhanced, i.e. the material fails at larger strains and reaches larger maximal stress values, when any of the parameters (a) -- (c) is increased.