Controllable thermal expansion of large magnitude in chiral negative Poisson's ratio lattices. Issue 7 (17th April 2015)

• Record Type: Journal Article
• Authors: Ha, Chan Soo; Hestekin, Eric; Li, Jianheng; Plesha, Michael E.; Lakes, Roderic S.
• Is Part Of: Physica status solidi. Volume 252:Issue 7(2015:Jul.)
• Page Start: 1431
• Page End: 1434
• Publication Date: 2015-04-17
• Subjects: Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201552158
• Languages: English
• ISSNs: 0370-1972

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="pssb201552158-sec-0001" sec-type="section"> <p>Lattices of controlled thermal expansion are presented based on planar chiral lattice structure with Poisson's ratio approaching <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgj1wg4fd20" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201552158:pssb201552158-math-0001" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>−</mml:mo><mml:mn>1</mml:mn></mml:math></alternatives></inline-formula>. Thermal expansion values can be arbitrarily large positive or negative. A lattice was fabricated from bimetallic strips and the properties analyzed and studied experimentally. The effective thermal expansion coefficient of the lattice is about <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgj1wg4fd1f" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201552158:pssb201552158-math-0002" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi><mml:mo>=</mml:mo><mml:mo>−</mml:mo><mml:mn>3.5</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>−</mml:mo><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:math></alternatives></inline-formula>K<inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgj1wg4fczt" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201552158:pssb201552158-math-0003" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow /><mml:mrow><mml:mo>−</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:math></alternatives></inline-formula>. This is much larger in magnitude than that of constituent metals. Nodes were observed to rotate as temperature was changed corresponding to a Cosserat thermoelastic solid.</p> </sec> </abstract>