Prof Maria Charalambides, Department of Mechanical Engineering, Imperial College, London, UK

Towards predictive models for fracture in highly filled particulate composites
When Mar 02, 2020
from 02:00 PM to 03:00 PM
Where LR1
Contact Name
Contact Phone 01865 273651
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This paper will summarise studies towards developing predictive numerical models of fracture within highly filled composites materials. Results will be presented from a number of studies including plastic bonded explosives PBX (volume fraction of 95%) and alumina trihydrate filled poly (methyl methacrylate) composites. The latter include a range of volume fractions (35%-45%) as well as particle size distributions and the effect of both these variations on the stiffness and fracture in these materials will be presented. For the former class of materials (PBX), problems such as the explicit modelling of all the particles are discussed; in order to pack to such high volume fractions, a very wide particle size attribution is needed. This makes numerical modelling of all the particles explicitly extremely difficult due to meshing problems associated with the vastly different length scales. The use of hierarchical multi-scale models to account for this problem will be investigated. Cohesive zone models are used to represent the interface separation around the particles.  The quantification of fracture parameters to simulate the debonding around the particles as well as through the matrix will be discussed. The predictive models are compared to experimental data for both these classes of materials.

Maria will also give an overview of the research within the Mechanics of Materials Division of the Department as well as her own other research conducted at the Soft Solids research group.