Cited by 117Polymer composites and self-healingAdvanced Materials and MechanicsShape Memory Alloy Transformations

A viscoplastic theory of shape memory polymer fibres with application to self-healing materials

Li, Guoqiang, Shojaei, Amir·2012·Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences

Abstract

The difficulty in healing structural damage is that most existing schemes need external help to bring the fractured surfaces in contact before healing can occur. To facilitate the existing schemes to heal macroscopic cracks, we envision that the cracked surfaces can be brought in contact through constrained shape recovery of a shape memory polymer (SMP) fibre-reinforced grid skeleton that is embedded in thermoset polymer matrix, similar to stitch a cut in the human skin by suture. In this study, we show that polyurethane SMP fibres can be hardened through cyclic cold-drawing programming, which makes them suitable for reinforcement and healing in thermoset polymer composites. We characterized the microstructure of the SMP fibres, which provides fundamental understanding of the effect of programming on the degree of crystallinity and molecular orientation. Then, a micromechanical multiscale viscoplastic theory is developed to predict the thermomechanical behaviours of the SMP fibres, including the cyclic hardening and stress recovery responses. The proposed theory takes into account the stress-induced crystallization process and the evolution of the morphological texture based on the applied stresses. The cyclic loading and the thermomechanical responses of the SMP fibres confirm the capabilities of the proposed model in capturing these phenomena.

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Crossref · 10.1098/rspa.2011.0628

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  • Using finite element analysis, Li and Shojaei demonstrated the possibility of healing macroscopic cracks by localized heating within a small area surrounding the cracked region, which was validated by experiment.

    “Using finite element analysis, Li and Shojaei [531] also demonstrated the possibility of healing macroscopic cracks by localized heating within a small area surrounding the cracked region, which was validated by experiment [530].”
  • Finite element analysis demonstrated the possibility of healing macroscopic cracks by localized heating within a small area surrounding the cracked region, which was validated by experiment.

    “Using finite element analysis, Li and Shojaei [531] also demonstrated the possibility of healing macroscopic cracks by localized heating within a small area surrounding the cracked region, which was validated by experiment [530].”
  • In the SMP fiber/thermoplastic particle healing system, upon heating, constrained shape recovery of pre-stretched SMP fibers closes macrocracks in the polymer matrix and bonds the closed crack through melting and diffusing of thermoplastic particles at the crack interface.

    “Upon heating, constrained shape recovery (shrinkage) of the pre-stretched SMP fibers closes macrocracks in the polymer matrix which is similar to stitching a cut in the human skin by suture; and bond the closed crack through melting and diffusing of thermoplastic particles at the crack interface.”
  • A biomimetic self-healing system using SMP fibers as grid skeleton and thermoplastic particles as healing agent was proposed to heal conventional thermoset polymers without SME.

    “Li et al. [185,530,531] proposed a new biomimetic self-healing system which includes using SMP fibers as grid skeleton and thermoplastic particles as the healing agent.”
  • A micromechanical multiscale viscoplastic theory was developed to predict the thermomechanical behaviors of the SMP fiber, taking into account stress-induced crystallization and evolution of morphological texture based on applied stresses.

    “Li and Shojaei [531] developed a micromechanical multiscale viscoplastic theory to predict the thermomechanical behaviors of the fiber.The proposed theory takes into account the stress-induced crystallization process and the evolution of the morphological texture based on the applied stresses.”

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Authors
Li, G., & Shojaei, A.
Affiliations
Louisiana State University (US)
Corresponding author
Li, Guoqiang
Venue
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Published
2012-04-11
Volume
468
Issue
2144
Pages
2319-2346
ISSN
  • 1364-5021 (ISSN-L)
  • 1471-2946
OpenAlex
W2152891883
Cited by
117
References
60
Citations by year
2025: 4 · 2024: 3 · 2023: 1 · 2022: 8 · 2021: 5 · 2020: 12 · 2019: 2 · 2018: 9 · 2017: 12 · 2016: 10 · 2015: 18 · 2014: 15 · 2013: 12 · 2012: 6
FWCI
12.83
Type
journal article
Language
en
Open access
closed
Locations
  • Proceedings of the Royal Society A Mathematical Physical and Engineering Sciences (publishedVersion)
  • Civil War Book Review (submittedVersion)
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
  • Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
  • Physical Sciences › Materials Science › Materials Chemistry › Shape Memory Alloy Transformations
Keywords
shape memory polymers, self-healing materials, shape recovery, thermoset composites, stress-induced crystallization, molecular orientation, crystallinity, cyclic hardening, stress recovery, crack healing

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