TY - JOUR
T1 - Design and characterization of rounded re-entrant honeycomb patterns for lightweight and rigid auxetic structures
AU - Chen, Shengwei
AU - Ryu, Seok Chang
N1 - Publisher Copyright:
© 2017 IOP Publishing Ltd.
PY - 2017/10/20
Y1 - 2017/10/20
N2 - In the past decades, auxetic structures have received great attention because of their unique properties and outstanding performance over the traditional materials. However, the inherent porosity significantly reduce the moduli of the structures, making auxetic structures inappropriate for load-bearing components. This paper introduces a rounded re-entrant honeycomb (RH) pattern, in which the rounded corners stiffen the traditional RH pattern by suppressing the hinging mechanism. Four design parameters were identified to define a rounded RH unit cell, and the effect of each of them on structure properties was numerically studied. The results demonstrated the extended tunable range of mechanical properties and the possibility of building lightweight and stiffer structures, as well as significantly improved tensile and shear moduli. It is also noticed that the Poisson's ratio shifts towards positive as the radius of the rounded corner increases. Several design strategies were proposed for achieving different design goals. The proposed rounded RH pattern could be an alternative for the existing RH pattern design, especially in the applications requesting for the lightweight and rigid auxetic structure.
AB - In the past decades, auxetic structures have received great attention because of their unique properties and outstanding performance over the traditional materials. However, the inherent porosity significantly reduce the moduli of the structures, making auxetic structures inappropriate for load-bearing components. This paper introduces a rounded re-entrant honeycomb (RH) pattern, in which the rounded corners stiffen the traditional RH pattern by suppressing the hinging mechanism. Four design parameters were identified to define a rounded RH unit cell, and the effect of each of them on structure properties was numerically studied. The results demonstrated the extended tunable range of mechanical properties and the possibility of building lightweight and stiffer structures, as well as significantly improved tensile and shear moduli. It is also noticed that the Poisson's ratio shifts towards positive as the radius of the rounded corner increases. Several design strategies were proposed for achieving different design goals. The proposed rounded RH pattern could be an alternative for the existing RH pattern design, especially in the applications requesting for the lightweight and rigid auxetic structure.
KW - AUXETIC
KW - lightweight tunable structures
KW - rounded re-entrant honeycomb
UR - http://www.scopus.com/inward/record.url?scp=85032815000&partnerID=8YFLogxK
U2 - 10.1088/1361-665X/aa8d3c
DO - 10.1088/1361-665X/aa8d3c
M3 - Article
AN - SCOPUS:85032815000
SN - 0964-1726
VL - 26
JO - Smart Materials and Structures
JF - Smart Materials and Structures
IS - 11
M1 - 115026
ER -