Open Conference Systems, StatPhys 27 Main Conference

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Application of Evolutionary Algorithms to the Design of Granular Materials for Tailored Behaviour Near to the Jamming Transition
Gary W Delaney

##manager.scheduler.building##: Edificio Santa Maria
##manager.scheduler.room##: Auditorio San Agustin
Date: 2019-07-10 12:00 PM – 03:45 PM
Last modified: 2019-06-14

Abstract


Gary W. Delaney and David Howard

We apply a combination of the Discrete Element Method and Evolutionary Algorithms to develop new fit for purpose granular materials that are tailored to specific performance profiles near to the jamming transition. We utilize a fully dynamic linear spring Discrete Element Method (DEM) simulation that allows for the specification of the particle properties including the sizes, masses, inter-particle friction, coefficient of restitution, particle shape and their interaction with arbitrary dynamic mesh objects. In our model particle shapes are represented as superellipsoids, giving us the ability to investigate a broad range of particle shapes, smoothly transitioning through a range of surface curvatures and aspect ratios. [1,2].

We employ an evolutionary algorithm approach to evolve the shape, interaction properties and environmental features to explore the complex high dimensional parameter space, iteratively improving both the maximum and mean fitness of the population of candidate solutions against multiple fitness criteria. This approach can be used to optimise any desired properties of the granular material and the properties of simulated dynamic mesh objects that the material is interacting with for specific behaviour near to the jamming transition. These applications range from determining optimal particle morphologies and compositions of granular materials for maximum density and control of local density distributions determined from the Voronoi diagram, through to more complex optimisation of material properties and device design for maximum performance including jammed material strength and shock absorbency.

References

[1] G. W. Delaney and P. W. Cleary, “The packing properties of superellipsoids,” EPL (Europhysics Letters), vol. 89, p. 34002, Feb. 2010.

[2] F. M. Schaller, M. Neudecker, M. Saadatfar, G. W. Delaney, G. E. Schrder-Turk, and M. Schrter, “Local Origin of Global Contact Numbers in Frictional Ellipsoid Packings,” Physical Review Letters, vol. 114, p. 158001, Apr. 2015.