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Deformation mechanisms in negative Poisson's ratio materials - Structural aspectsPoisson's ratio in materials is governed by the following aspects of the microstructure: the presence of rotational degrees of freedom, non-affine deformation kinematics, or anisotropic structure. Several structural models are examined. The non-affine kinematics are seen to be essential for the production of negative Poisson's ratios for isotropic materials containing central force linkages of positive stiffness. Non-central forces combined with pre-load can also give rise to a negative Poisson's ratio in isotropic materials. A chiral microstructure with non-central force interaction or non-affine deformation can also exhibit a negative Poisson's ratio. Toughness and damage resistance in these materials may be affected by the Poisson's ratio itself, as well as by generalized continuum aspects associated with the microstructure.
Document ID
19910053191
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lakes, R.
(Iowa, University Iowa City, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1991
Publication Information
Publication: Journal of Materials Science
Volume: 26
ISSN: 0022-2461
Subject Category
Structural Mechanics
Accession Number
91A37814
Funding Number(s)
CONTRACT_GRANT: NAS1-18889
Distribution Limits
Public
Copyright
Other

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