Shape forming by thermal expansion mismatch and shape memory locking in polymer/elastomer laminates
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Abstract This paper studies a novel method to fabricate three-dimensional (3D) structure from 2D thermo-responsive shape memory polymer (SMP)/elastomer bilayer laminate. In this method, the shape change is actuated by the thermal mismatch strain between the SMP and the elastomer layers upon heating. However, the glass transition behavior of the SMP locks the material into a new 3D shape that is stable even upon cooling. Therefore, the second shape becomes a new permanent shape of the laminate. A theoretical model that accounts for the temperature-dependent thermomechanical behavior of the SMP material and thermal mismatch strain between the two layers is developed to better understand the underlying physics. Model predictions and experiments show good agreement and indicate that the theoretical model can well predict the bending behavior of the bilayer laminate. The model is then used in the optimal design of geometrical configuration and material selection. The latter also illustrates the requirement of thermomechanical behaviors of the SMP to lock the shape. Based on the fundamental understandings, several self-folding structures are demonstrated by the bilayer laminate design.
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The phase transition approach has been applied to soft robotics and actuators, focusing on approaches that avoid the programming step and on single-material structures.
“The phase transition approach has been applied to soft robotics and actuators, e.g., focusing on to the approaches that avoid the need of the programming step (see Section 3) [212,213] and to single-material structures [219].”
From Two-Way and Multiple-Way Shape Memory Polymers for Soft Robotics: An Overview (2020) · cites this paper as [212]
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- Authors
- Yuan, C., Ding, Z., Wang, T. J., Dunn, M. L., & Qi, H. J.
- Affiliations
- Georgia Institute of Technology (US)
- Singapore University of Technology and Design (SG)
- State Key Laboratory of Mechanical Structure Strength and Vibration (CN)
- Corresponding author
- Dunn, Martin L
- Qi, H Jerry
- Venue
- Smart Materials and Structures
- Publisher
- IOP Publishing
- Published
- 2017-09-13
- Volume
- 26
- Issue
- 10
- Pages
- 105027
- ISSN
- 0964-1726 (ISSN-L)
- 1361-665X
- OpenAlex
- W2737754785
- Cited by
- 60
- References
- 36
- Citations by year
- 2026: 5 · 2025: 5 · 2024: 7 · 2023: 6 · 2022: 7 · 2021: 8 · 2020: 12 · 2019: 9 · 2018: 1
- FWCI
- 4.68
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Smart Materials and Structures (publishedVersion)
- Funders
- Air Force Office of Scientific Research (FA9550-16-1-0169)
- Directorate for Engineering (1462894)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
- Physical Sciences › Engineering › Biomedical Engineering › Dielectric materials and actuators
- Keywords
- shape memory polymers, thermal expansion mismatch, shape locking, glass transition, temperature-responsive materials, thermomechanical behavior, flexural behavior
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