Design and Characterization of Microscale Auxetic and Anisotropic Structures Fabricated by Multiphoton Lithography

Nanomaterials

Ioannis Spanos¹  Zacharias Vangelatos²  Costas Grigoropoulos²  Maria Farsari³ 

[1] Department of Engineering Science, University of Oxford, Oxford OX1 4BH, UK;Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA;Nonlinear Lithography Laboratory, Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology, Hellas (FORTH), 70013 Heraklion, Crete, Greece;

关键词: mechanical metamaterials;    controlled anisotropy;    auxeticity;    FEA simulations;    multiphoton lithography;    in-situ SEM-nanoindentation;   

DOI  :  10.3390/nano11020446

来源: DOAJ

【 摘 要 】

The need for control of the elastic properties of architected materials has been accentuated due to the advances in modelling and characterization. Among the plethora of unconventional mechanical responses, controlled anisotropy and auxeticity have been promulgated as a new avenue in bioengineering applications. This paper aims to delineate the mechanical performance of characteristic auxetic and anisotropic designs fabricated by multiphoton lithography. Through finite element analysis the distinct responses of representative topologies are conveyed. In addition, nanoindentation experiments observed in-situ through scanning electron microscopy enable the validation of the modeling and the observation of the anisotropic or auxetic phenomena. Our results herald how these categories of architected materials can be investigated at the microscale.

【 授权许可】

Unknown