TY - JOUR
T1 - Negative Thermal Expansion Realized by an Incomplete Bimaterial Ring
AU - Pasternak, Elena
AU - Dyskin, Arcady
N1 - Publisher Copyright:
© 2024 The Author(s). physica status solidi (b) basic solid state physics published by Wiley-VCH GmbH.
PY - 2024/12
Y1 - 2024/12
N2 - Incomplete bimaterial ring (a circular ring with a gap) capable of producing negative macroscopic thermal expansion is proposed and its behavior is analyzed. The ring exhibits negative thermal expansion (NTE) (in the plane of the ring) when the outer ring has higher thermal expansion coefficient than the inner one. When the thermal expansion coefficients are equal (monomaterial incomplete ring), the effective (macroscopic) planar thermal expansion becomes zero. (The complete thermal expansion will be positive but small.) It is the presence of the gap which is the basis of this thermal behavior. Similar effect can be achieved by spring or spiral structures where the role of the gap is played by the open ends. These structures will have higher stiffness than the incomplete bimaterial ring. The thermal expansion of the ring is characterized by the effective (macroscopic) coefficient of linear thermal expansion. The effective coefficient of linear thermal expansion depends on the temperature increase, making the thermal expansion nonlinear. Planar and 3D NTE structures are considered.
AB - Incomplete bimaterial ring (a circular ring with a gap) capable of producing negative macroscopic thermal expansion is proposed and its behavior is analyzed. The ring exhibits negative thermal expansion (NTE) (in the plane of the ring) when the outer ring has higher thermal expansion coefficient than the inner one. When the thermal expansion coefficients are equal (monomaterial incomplete ring), the effective (macroscopic) planar thermal expansion becomes zero. (The complete thermal expansion will be positive but small.) It is the presence of the gap which is the basis of this thermal behavior. Similar effect can be achieved by spring or spiral structures where the role of the gap is played by the open ends. These structures will have higher stiffness than the incomplete bimaterial ring. The thermal expansion of the ring is characterized by the effective (macroscopic) coefficient of linear thermal expansion. The effective coefficient of linear thermal expansion depends on the temperature increase, making the thermal expansion nonlinear. Planar and 3D NTE structures are considered.
KW - incomplete bimaterial rings
KW - interlocking connections
KW - macroscopic coefficient of thermal expansion
KW - negative thermal expansion
KW - spiral negative thermal expansion element
UR - http://www.scopus.com/inward/record.url?scp=85205807271&partnerID=8YFLogxK
U2 - 10.1002/pssb.202400048
DO - 10.1002/pssb.202400048
M3 - Article
AN - SCOPUS:85205807271
SN - 0370-1972
VL - 261
JO - Physica Status Solidi (B) Basic Research
JF - Physica Status Solidi (B) Basic Research
IS - 12
M1 - 2400048
ER -