Summary:
Functionally graded material (FGM) is a class of advanced materials which have dual phases composition with uniformly varying material properties in preassigned directions to give rise composite materials which have high performance and multifunctionality. In this presentation the basic concepts, rules for assessment of material properties gradation and applications fields are brief described. Then two different topics involving the FGM, corresponding to two different observation scales are considered. The first one considers elastic explicit solutions for solids in which the FGM (coating, interlayers, …) permits to improve the elastic response of the composite structure in comparison with the use of homogeneous materials (multilayers, coatings…). In the framework of the elasticity theory some solutions are selected and presented to highlight the effect of graded materials. These solutions can be useful as benchmarks for numerical approaches or to material scientists in the tailoring of FGM by choosing material combination and the gradation technique according to application. The second one concerns the study of a micromechanical models to predict elastic properties in particulate composite with spherical solid or hollow inclusions with FGM coating useful to increase the performance in nanocomposites. Expressions in closed-form to obtain the bulk and shear modulus using Hashin’s approach are presented and parametric investigations performed to contribute to the validation of the experimental tests to evaluate the elastic properties in particulate composites.
References of the lecturer on FGM
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