Open AccessMechanical response of shape-recovering metamaterial structures fabricated by additive manufacturing
Author(s) -
Md Sahid Hassan,
Luis A. Chavez,
ChienChun Chou,
Samuel Ernesto Hall,
Tzu-Liang Tseng,
Yirong Lin
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ac343f
Subject(s) - materials science , toughness , composite material , metamaterial , stereolithography , compressive strength , hardening (computing) , compression test , compression (physics) , optoelectronics , layer (electronics)
Three different metamaterial structures were fabricated using stereolithography 3D printing and a shape recovering material. Mechanical properties and recovery efficiency were assessed after compression testing. All three structures exhibited similar initial specific compressive moduli, while the highest specific toughness was observed for the stretch-dominated structure. The three metamaterial structures were re-tested after shape recovery. Significant strengthening was observed for all structures, with the bend-stretch-dominated structure strengthening to the highest degree. This strengthening phenomenon was characterized as strain hardening. It was found that the strengthening is highly geometry dependent. The geometry with stretch-dominated behavior exhibited the highest mechanical properties after a second test was performed. Improvements in specific toughness of up to 67% were observed after the second compressive test.