Dr Claudio Lopes, IMDEA Materials

Coupled experimental-numerical mechanical characterisation of composites at several scales
When Feb 22, 2016
from 02:00 PM to 03:00 PM
Where LR8
Contact Name
Contact Phone 01865-273925
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A coupled experimental-numerical multiscale approach to design composite materials and structures is proposed. A virtual analysis strategy that physically describes the material behaviour at different length scales from ply to laminate, and to composite structure is being developed and validated at IMDEA Materials. This approach is then applied to design and optimize novel microstructures, non-conventional laminates, and next-generation structural composites that take full advantage of the potential design space and manufacturing possibilities in composites, such as steered-fibre composites.

The cornerstone of this approach is the characterization of the three elementary composite constituents (fibre, matrix and fibre/matrix interface) by means of experimental micromechanics. Then, the numerical simulation of the micromechanical behaviour of the composite plies is achieved by means of Representative Volume Element and Embedded Cell Element techniques that describe the elastic, plastic and fracture behaviour of the different phases by means of appropriate constitutive equations. At mesoscale level, laminates are simulated by means of continuum models for plies and ply-interfaces that take into account the mechanisms of deformation and failure as predicted by computational micromechanics and observed experimentally. At structural level, the composite is modelled by means of single shells that implicitly describe the behaviour of the plies in the laminate.

Besides the simulation of the actual physical mechanisms of deformation and damage in composites, another advantage of this bottom-up multiscale approach is that changes in the properties of the constituents, in microstructure, laminate lay-up or fibre architecture can be easily taken into account to perform reliable predictions of the macroscopic behaviour of the composite. Hence, multiscale design of next-generation composites is within reach.