Functional fatigue of shape memory polymers
Abstract
Abstract In the present study the functional fatigue in the commercial SMP Veriflex® which is associated with repeating up to 20 programming/1‐WE cycles has been examined. The material is characterized by a glass temperature Tg of 67 °C, above which it looses all its strength. During tensile testing at 21 °C (T < Tg), stresses steadily increase to 26 MPa as strains approach the rupture strain of 7.6 %. At 80 °C (T > Tg) the material can be strained up to 225 % before rupture occurs while stresses slowly increase to values as low as 0.4 MPa. Thermomechanical cycles including programming, cooling and unloading and heating to trigger the one way effect result in an increase of irreversible strain associated with a corresponding decrease of recovery ratio at the beginning of thermomechanical cycling. In parallel a wavy surface structure evolves during cycling.
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Surface wavelength of about 195 μm was detected by optical microscopy on Veriflex after cycling.
“In this connection, a surface wavelength of about 195 μm could be detected by optical microscopy (Figure 5).”
From Review on the Functional Determinants and Durability of Shape Memory Polymers (2010) · cites this paper as [239]
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References 15 · Cited by 55
- Authors
- Schmidt, C., Neuking, K., & Eggeler, G.
- Affiliations
- Ruhr University Bochum (DE)
- Corresponding author
- Schmidt, C.
- ORCID
- Eggeler, G.
- Venue
- Advanced Engineering Materials
- Publisher
- Wiley
- Published
- 2008-10
- Volume
- 10
- Issue
- 10
- Pages
- 922-927
- ISSN
- 1438-1656 (ISSN-L)
- 1527-2648
- OpenAlex
- W2011404171
- Cited by
- 55
- References
- 15
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 4 · 2023: 3 · 2022: 2 · 2021: 3 · 2020: 1 · 2019: 2 · 2018: 4 · 2017: 4 · 2016: 2 · 2015: 3 · 2014: 1 · 2013: 4 · 2012: 1
- FWCI
- 12.77
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Advanced Engineering Materials (publishedVersion)
- 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, functional fatigue, thermomechanical cycling, glass transition temperature, tensile properties, irreversible strain, recovery ratio, fracture strain
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