Mechanical Properties of Shape Memory Alloys and Polymers—A Review on the Study by Prof. Tobushi

Matsui, Ryosuke; Takeda, Kohei; Tobushi, Hisaaki

doi:10.1007/978-3-319-53306-3_8

Cited by 5 publications

(7 citation statements)

References 95 publications

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“…Shape memory polymers (SMPs) are gaining increasing attention due to their versatile functionality [ 1 , 2 , 3 , 4 ]. These innovative materials exhibit the capability to retain a temporary shape and subsequently return to their initial shape upon exposure to an external stimulus, e.g., heat [ 1 , 5 , 6 , 7 ], moisture [ 6 , 8 , 9 ], electric field [ 10 ], magnetic field [ 11 ], pH [ 12 , 13 ], microwaves [ 14 ], or light [ 15 , 16 ]. Thermoresponsive shape memory polymers with the remarkable ability to remember their temporary shape and recover their original one through temperature are the largest class of SMPs [ 2 , 3 , 5 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the polymer exhibits a high elastic modulus below the T g , while above the T g , the modulus significantly decreases, enabling the release of internal stresses and facilitating the shape recovery process. Therefore, the T g is a key parameter that defines the polymer’s behavior because it influences the different molecular structures of the polymer segments, depending on whether they are below or above this particular temperature [ 2 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Shape Memory Polyurethane Properties in Cold Programming Process Towards Its Applications

Staszczak,

Urbański,

Cristea

et al. 2024

Polymers

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Thermoresponsive shape memory polymers (SMPs) with the remarkable ability to remember a temporary shape and recover their original one using temperature have been gaining more and more attention in a wide range of applications. Traditionally, SMPs are investigated using a method named often “hot-programming”, since they are heated above their glass transition temperature (Tg) and after that, reshaped and cooled below Tg to achieve and fix the desired configuration. Upon reheating, these materials return to their original shape. However, the heating of SMPs above their Tg during a thermomechanical cycle to trigger a change in their shape creates a temperature gradient within the material structure and causes significant thermal expansion of the polymer sample resulting in a reduction in its shape recovery property. These phenomena, in turn, limit the application fields of SMPs, in which fast actuation, dimensional stability and low thermal expansion coefficient are crucial. This paper aims at a comprehensive experimental investigation of thermoplastic polyurethane shape memory polymer (PU-SMP) using the cold programming approach, in which the deformation of the SMP into the programmed shape is conducted at temperatures below Tg. The PU-SMP glass transition temperature equals approximately 65 °C. Structural, mechanical and thermomechanical characterization was performed, and the results on the identification of functional properties of PU-SMPs in quite a large strain range beyond yield limit were obtained. The average shape fixity ratio of the PU-SMP at room temperature programming was found to be approximately 90%, while the average shape fixity ratio at 45 °C (Tg − 20 °C) was approximately 97%. Whereas, the average shape recovery ratio was 93% at room temperature programming and it was equal to approximately 90% at 45 °C. However, the results obtained using the traditional method, the so-called hot programming at 65 °C, indicate a higher shape fixity value of 98%, but a lower shape recovery of 90%. Thus, the obtained results confirmed good shape memory properties of the PU-SMPs at a large strain range at various temperatures. Furthermore, the experiments conducted at both temperatures below Tg demonstrated that cold programming can be successfully applied to PU-SMPs with a relatively high Tg. Knowledge of the PU-SMP shape memory and shape fixity properties, estimated without risk of material degradation, caused by heating above Tg, makes them attractive for various applications, e.g., in electronic components, aircraft or aerospace structures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Shape Memory Polyurethane Properties in Cold Programming Process Towards Its Applications

Staszczak,

Urbański,

Cristea

et al. 2024

Polymers

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“…There are several devices available for studying the deformation behavior of superelastic materials, ranging from simple mechanical devices to automated computerized machines. Devices for cyclic tensile loading of fibers contain a large number of kinematic joints and nodes, which reduce measurement accuracy, and sometimes lack digital control and data processing [18][19][20]. At the same time, there are computerized universal testing machines manufactured by Instron (USA), MTS Systems (USA), and Testex (China) [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Portable universal tensile testing machine for studying mechanical properties of superelastic biomaterials

Gunther¹,

Марченко²,

Yasenchuk³

et al. 2021

Eng. Res. Express

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A portable universal tensile testing machine for single and cyclic loading of superelastic biomaterials is presented. It’s an alternative to large-sized stationary universal testing machines. The machine is designed to obtain uniaxial cyclic tension stress-strain curves of materials with a low elastic modulus, including biological tissues. Its portability allows using it in various conditions: classrooms, production laboratories, and in the field. An interface has been developed to connect it to a computer. Computer output of experimental data allows recording and displaying load-displacement curves, setting the number of cycles, limits, and rate of cyclic deformation. Several examples of testing various biomaterials are presented. The functional advantage of the device is the wide tensile testing speed range of 0.01-10 mm/s and cyclic loading, which allow capturing viscoelastic and superelastic behavior of biomaterials.

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“…Shape memory polymer matrix (SMP) has been extensively implemented spanning various areas such as biomedical devices, automotive parts, soft robots or aircraft/aerospace components (Matsui et al. , 2017a; Arun et al.…”

Section: Introductionmentioning

confidence: 99%

4D-printed parametric façade in architecture: prototyping a self-shaping skin using programmable two-way shape memory composite (TWSMC)

2021

ECAM

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PurposeThis study aims to present an architectural application of 4D-printed climate-adaptive kinetic architecture and parametric façade design.Design/methodology/approachThis work investigates experimental prototyping of a reversibly self-shaping façade, by integrating the parametric design approach, smart material and 4D-printing techniques. Thermo-responsive building skin modules of two-way shape memory composite (TWSMC) was designed and fabricated, combining the shape memory alloy fibers (SMFs) and 3D-printed shape memory polymer matrices (SMPMs). For geometry design, deformation of the TWSMC was simulated with a dimension-reduced mathematical model, and an optimal arrangement of three different types of TWSMC modules were designed and fabricated into a physical scale model.FindingsModel-based experiments show robust workability and formal reversibility of the developed façade. Potential utility of this module for adaptive building design and construction is discussed based on the results. Findings help better understand the shape memory phenomena and presented design-inclusive technology will benefit architectural communities of smart climate-adaptive building.Originality/valueTwo-way reversibility of 4D-printed composites is a topic of active research in material science but has not been clearly addressed in the practical context of architectural design, due to technical barriers. This research is the first architectural presentation of the whole design procedure, simulation and fabrication of the 4D-printed and parametrically movable façade.

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Mechanical Properties of Shape Memory Alloys and Polymers—A Review on the Study by Prof. Tobushi

Cited by 5 publications

References 95 publications

Investigation of Shape Memory Polyurethane Properties in Cold Programming Process Towards Its Applications

Investigation of Shape Memory Polyurethane Properties in Cold Programming Process Towards Its Applications

Portable universal tensile testing machine for studying mechanical properties of superelastic biomaterials

4D-printed parametric façade in architecture: prototyping a self-shaping skin using programmable two-way shape memory composite (TWSMC)

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