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J, Gandra, Miranda R, Vilaca P, Velhinho A, and Teixeira JP. "Functionally graded materials produced by friction stir processing." JOURNAL OF MATERIALS PROCESSING TECHNOLOGY. 211 (2011): 1659-1668. Abstract
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J.S. Raminhos, A. Velhinho, Borges J. P. "Development of Polymeric Anepectic Meshes: Auxetic Metamaterials with Negative Thermal Expansion." Smart Materials & Structures. 28 (2019): 045010. Abstract

This paper reports the application of additive manufacturing technology to fabricate bidimensional
lightweight composite meshes capable of demonstrating auxetic properties
(negative Poisson’s ratio (NPR)) in combination with negative thermal expansion (NTE)
behaviour, using as constituent materials polymers that do not exhibit NTE behaviour. To
describe the combination of NPR and NTE characteristics, the designation of ‘anepectic’ is being
proposed. Each mesh, obtained from varying either the material combination or the design
parameters, was tested on a heated silicone bath to study the effects of the different combinations
on the coefficient of thermal expansion (CTE). It was found that all meshes studied demonstrated
a successful combination of NPR and NTE behaviours, and it was revealed that there is a
possibility to tailor the meshes to activate the NTE behaviour within a chosen range of
temperatures. For an extreme case, a Poisson’s ratio of −0.056, along with a CTE of
−1568×10^−6 K−1 has been achieved.

João, Gandra, Vigarinho Pablo, Pereira Diogo, Miranda Rosa, Vilaça Pedro, and Velhinho Alexandre. "Wear characterization of Functionally Graded Surface composites produced by Friction Surfacing." 52 (2013): 373-383. Abstract
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João, Gandra, Miranda Rosa M., Vilaça Pedro, and Velhinho Alexandre. "Production of functionally graded surface composites by friction surfacing." Mechanics of Nano, Micro and Macro Composite Structures. 2012. 1-2. Abstract
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