NDLI: Modeling particulate self-healing materials and application to uni-axial compression

Content Provider	Springer Nature Link
Author	Luding, Stefan Herbst, Olaf
Copyright Year	2009
Abstract	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 unconfined uni-axial compression until and beyond failure. 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 loading such that the material strength of the sample increases and failure/softening is delayed to larger strains. 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. For very large adhesion between the healed contacts an interesting instability with strong (brittle) fluctuations of the healed material’s strength is observed.
Ending Page	103
Page Count	17
Starting Page	87
File Format	PDF
ISSN	03769429
e-ISSN	15732673
Journal	International Journal of Fracture
Issue Number	1-2
Volume Number	154
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-02-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Friction Granular materials Self-healing materials Civil Engineering Mechanics Automotive Engineering Characterization and Evaluation of Materials Particle simulation Mechanical Engineering Adhesion Contact force-laws Elasto-plastic contact deformation
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Computational Mechanics Modeling and Simulation

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