TY - JOUR
T1 - Effective Mechanical Responses of a Class of 2D Chiral Materials
AU - Wang, Yun Che
AU - Ko, Tsai Wen
AU - Ren, Xuejun
N1 - Funding Information:
Y.‐C.W. acknowledges partial supports from the Ministry of Science and Technology, Taiwan, with grant number MOST 108‐2221‐E‐006‐012, 109‐2221‐E‐006‐016‐MY3, and 109CP02, as well as from Taiwan MOST and British Office Taipei with grant number 109‐BOT‐I‐006‐501. The authors are grateful to the National Center for High‐performance Computing, Taiwan, for computer time and facilities.
Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Chiral materials may exhibit negative Poisson's ratio and deformation-mode coupling phenomena. The finite element numerical method is adopted to analyze a class of 2D chiral and nonchiral materials and to show the effects of microstructural geometry on their effective elastic properties and coupling between tension/compression and bending. With the same area fraction (AF), nonchiral samples show larger effective moduli than chiral ones. The number of unit cells may reduce negativity in effective Poisson's ratio of the chiral samples due to nonuniform lateral deformation under uniaxial straining. Increasing AF in a hierarchical pattern in the chiral samples makes their Poisson's ratio more negative. Bending occurs in the chiral samples when they are under uniform, uniaxial, tensile, or compressive straining due to the coupling of deformation modes. The sensibility of tension–bending coupling may be controlled by the chiral microstructure. Optimization of the coupling sensitivity may help develop novel mechanical sensors.
AB - Chiral materials may exhibit negative Poisson's ratio and deformation-mode coupling phenomena. The finite element numerical method is adopted to analyze a class of 2D chiral and nonchiral materials and to show the effects of microstructural geometry on their effective elastic properties and coupling between tension/compression and bending. With the same area fraction (AF), nonchiral samples show larger effective moduli than chiral ones. The number of unit cells may reduce negativity in effective Poisson's ratio of the chiral samples due to nonuniform lateral deformation under uniaxial straining. Increasing AF in a hierarchical pattern in the chiral samples makes their Poisson's ratio more negative. Bending occurs in the chiral samples when they are under uniform, uniaxial, tensile, or compressive straining due to the coupling of deformation modes. The sensibility of tension–bending coupling may be controlled by the chiral microstructure. Optimization of the coupling sensitivity may help develop novel mechanical sensors.
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U2 - 10.1002/pssb.202000277
DO - 10.1002/pssb.202000277
M3 - Article
AN - SCOPUS:85089495563
VL - 257
JO - Physica Status Solidi (B): Basic Research
JF - Physica Status Solidi (B): Basic Research
SN - 0370-1972
IS - 10
M1 - 2000277
ER -