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Resumo(s)
Structural metamaterials presenting negative values of one or more mechanical and thermomechanical indices – namely the Poisson's ratio, the linear compressibility, and the coefficient of thermal expansion – are the promising candidates to the applications in many fields, ranging from precision mechanics to biomedical devices or energy absorption. Although scattered mentions may be found in the literature since the late eighties of 20th century, the systematic research efforts concerning these materials became effective much later. The present work is to review the main scientific contributions to the topic in the last five years. This paper first deals with those metamaterials showing a single negative index, and then proceeds to analyze the much less frequent instances of coupled negative indices, with emphasis on the so-called anepectic case, which exhibits an unusual thermomechanical response.
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Funding Information:
This work was funded by National Funds through FCT - Portuguese Foundation for Science and Technology, Reference UID/CTM/50025/2019. Jo?o Cardoso acknowledges the funding by FCT
Publisher Copyright:
© 2021 Chinese Materials Research Society
Palavras-chave
Anepectic Auxetic Mechanical and thermomechanical metamaterials Negative linear compressibility Negative Poisson's ratio Negative thermal expansion General Materials Science