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The macroscopic behavior of pantographic sheets depends mainly on their microstructure: Experimental evidence and qualitative analysis of damage in metallic specimens

 
: Angelo, Michele de; Spagnuolo, Mario; D'Annibale, Francesco; Pfaff, Aron; Hoschke, Klaus; Misra, Aviral; Dupuy, Corinne; Peyre, Patrice; Dirrenberger, Justin; Pawlikowski, Marek

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Continuum Mechanics and Thermodynamics 31 (2019), No.4, pp.1181-1203
ISSN: 0935-1175
ISSN: 1432-0959
European Commission EC
H2020-Marie Skłodowska Curie Grant; 665850; INSPIRE
INterdiSciPlinarity and excellence for doctoral training of International REsearchers in Paris
English
Journal Article
Fraunhofer EMI ()
pantographic structures; additive manufacturing; tomography; generalized continua

Abstract
Recently the exotic properties of pantographic metamaterials have been investigated, and various mathematical models (both discrete and continuous) have been introduced. However, the experimental evidence available up to now concerns only polyamide specimens. In this paper, we use specimens printed using metallic powder. We prove experimentally that the main qualitative and quantitative features of pantographic sheets in planar deformation are independent of the constituting materials, at least when they can be regarded as homogeneous and isotropic at micro-level. Of course, the absolute value of Young’s modulus of constituent material affects the overall reaction force needed to the hard device to impose a given displacement: A first investigation on this effect is also attempted.

: http://publica.fraunhofer.de/documents/N-537608.html