Thermomechanical recovery couplings of shape memory polymers in flexure
Open accessAbstract
Shape memory polymers (SMPs) have the capacity to recover large strains when pre-deformed at an elevated temperature, cooled to a lower temperature and reheated. The thermomechanical recovery behavior of an SMP is examined in three-point flexure for various pre-deformation and recovery conditions. Results indicate that when pre-deformed well above the glass transition temperature, T g , the stress–strain response at the pre-deformation temperature governs the relationship between the recovery stress/strain and the corresponding pre-deformation strain/stress. When pre-deformed at a temperature below T g , the relationship between recoverable stress and strain level in the SMP is not governed by the stress–strain response of the material at the pre-deformation temperature. Rather, a peak recovery stress, which is less than the applied pre-deformation stress, appears near T g . Higher cooling rates during constraint lower the temperature necessary for complete shape fixity, but increase the recoverable stress level. Higher heating rates during recovery raise the recovery onset temperature and decrease the peak recoverable stress. Ramifications of the results on future research efforts and emerging applications of SMPs are discussed.
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Cyclic thermo-mechanical behavior of an SMP depends on the polymer's thermal and visco-elastic properties, specimen size, clamping conditions, load cell sensitivity and testing conditions.
“The cyclic thermo-mechanical behavior of an SMP depends on the polymer's thermal and visco-elastic properties (e.g., the thermal transition temperatures, broadness of the transitions, expansion behavior, intensity of change in modulus), specimen size, clamping conditions (gauge length and clamping pressure), load cell sensitivity (setting of proportional-integral-derivative parameters) and testing”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [188]
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- Authors
- Liu, Y., Gall, K., Dunn, M. L., & McCluskey, P.
- Affiliations
- University of Colorado Boulder (US)
- Venue
- Smart Materials and Structures
- Publisher
- IOP Publishing
- Published
- 2003-11-19
- Volume
- 12
- Issue
- 6
- Pages
- 947-954
- ISSN
- 0964-1726 (ISSN-L)
- 1361-665X
- OpenAlex
- W2057391285
- Cited by
- 114
- References
- 15
- Citations by year
- 2026: 1 · 2024: 3 · 2023: 2 · 2022: 4 · 2021: 2 · 2020: 3 · 2019: 7 · 2018: 4 · 2017: 6 · 2016: 5 · 2015: 5 · 2014: 6 · 2013: 6 · 2012: 7
- FWCI
- 6.24
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Smart Materials and Structures (publishedVersion)
- Funders
- National Science Foundation (0200495)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Materials Science › Materials Chemistry › Shape Memory Alloy Transformations
- Keywords
- shape memory polymers, three-point bending, pre-deformation, glass transition temperature, shape fixity, cooling rate, heating rate, stress-strain behavior
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