Shape memory materials

Huang, Wei Min; Ding, Zhaozhao; Wang, C.C.; Wei, Jun; Zhao, Yong; Purnawali, Hendra

doi:10.1016/s1369-7021(10)70128-0

Cited by 601 publications

(404 citation statements)

References 78 publications

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“…moisture, pH). [1][2][3] The simplest type of SMP is formed from amorphous polymer. In this case the SMP is created by heating the material to a temperature above the glass transition temperature (Tg), inducing molecular chain orientation by stretching it, and then freezing in the orientation by cooling.…”

Section: Introductionmentioning

confidence: 99%

“…2,5,6 A key parameter which determines the final stress achieved is the temperature at which the SMP has been programmed, and the maximum value for the stress upon reheating generally occurs at or near the programming temperature initially used. 3,7 The restrained shrinkage stress also depends upon the programming strain and strain rate. 3,7 The magnitude of the restrained shrinkage stress is positively correlated with the energy stored by the SMP during deformation, and is limited by the relatively low elastic modulus of the material in the rubbery state (above Tg).…”

Section: Introductionmentioning

confidence: 99%

“…3,7 The restrained shrinkage stress also depends upon the programming strain and strain rate. 3,7 The magnitude of the restrained shrinkage stress is positively correlated with the energy stored by the SMP during deformation, and is limited by the relatively low elastic modulus of the material in the rubbery state (above Tg). Efforts to improve the rubbery state elastic modulus have included increasing the cross-linking density and the incorporation of fillers into the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Teall

Pilegis

Sweeney

et al. 2017

Smart Mater. Struct.

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The shrinkage force exerted by restrained shape memory polymers can potentially be used to close cracks in structural concrete. This paper describes the physical processing and experimental work undertaken to develop high shrinkage die-drawn Polyethylene Terephthalate (PET) shape memory polymer tendons for use within a crack closure system. The extrusion and die-drawing procedure used to manufacture a series of PET tendon samples is described. The results from a set of restrained shrinkage tests, undertaken at differing activation temperatures, are also presented along with the mechanical properties of the most promising samples.The stress developed within the tendons is found to be related to the activation temperature, the cross-sectional area and to the draw rate used during manufacture. Comparisons with commercially-available PET strip samples used in previous research are made, demonstrating an increase in restrained shrinkage stress by a factor of two for manufactured PET filament samples.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Teall

Pilegis

Sweeney

et al. 2017

Smart Mater. Struct.

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show abstract

“…SMP is a fastgrowing area. The shape memory (SM) mechanisms, applications and latest advancements in SMPs can be found in several recent review papers, see for example Behl & Lendlein (2007), Ratna (2009), Huang et al (2010), Leng et al (2011) and Ratna & Karger-Kocsis (2011). The key for the success of this self-healing scheme is that the volume of the SMP matrix must be reduced during programming and external confinement must be provided during shape recovery (Li & Uppu 2010).…”

Section: Introductionmentioning

confidence: 99%

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

Shojaei

2012

Proc. R. Soc. A.

103

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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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“…[9] The underlying effect is called the shape memory effect (SME). One of the most important and most widely used SMMs is shape memory alloy (SMA) due to its high performance and ease in development.…”

Section: Shape Memory Alloy (Sma)mentioning

confidence: 99%

Shape memory actuated sliding mechanism for rapid switching between button-patterns for adapted human-machine interaction at different automatization levels in automobiles

Kalairaj

Huang

2016

MATEC Web Conf.

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Abstract. Almost all electronics and mechanical equipment have controllers to control the entire or certain tasks. These controllers respond to various types of inputs and performs the function accordingly. One type of input given to the controller is the touch and these controllers which use human touch has touch screen to act as the medium. The touch screen does not give haptic feedback to the users whereas the buttons normally take up more space and cause disturbance and confusion in recognizing the state and the function of the buttons. In this paper, we propose a simple sliding mechanism for rapid switching between different button patterns, in which the buttons remain flat in the surface when inactive and protrude out of the surface when active. The design and simulation are carried out on SolidWorks and the prototypes are fabricated and tested. This mechanism incorporated in the buttons and installed in an automobile, increases the level of automation and enhances the human-machine interaction.

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Shape memory materials

Cited by 601 publications

References 78 publications

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

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

Shape memory actuated sliding mechanism for rapid switching between button-patterns for adapted human-machine interaction at different automatization levels in automobiles

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