Thermomechanical Properties of Shape-Memory Alloy and Polymer and Their Composites

Tobushi, Hisaaki; Pieczyska, E. A.; Ejiri, Yoshihiro; Sakuragi, Toshimi

doi:10.1080/15376490902746954

Cited by 55 publications

(33 citation statements)

References 14 publications

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“…The temperature difference in the area where the band appears is about 8 K, proving the rapid nature of the process. As the tension proceeds, the band widens significantly and other bands appear at first parallel and then inclined at the same angle but in the opposite direction [2][3][4][5]12]. The highest temperature was registered at the intersection of the bands [5].…”

Section: Mechanical and Temperature Characteristics Related To Complementioning

confidence: 99%

“…Application of an infrared camera allows monitoring of the temperature distribution on the examined specimen surface, i.e. measurement of the mean temperature in a contact-less way over an arbitrary chosen area or points [2][3][4][5]7,8,[10][11][12][13]. The goal of the paper is to describe the thermomechanical effects accompanying the martensite forward and reverse transformations during a particular loading program of TiNi SMA, basing on the results obtained from a smart testing machine and a modern infrared camera.…”

Section: Introductionmentioning

confidence: 99%

“…Since the shape memory alloys are strongly temperature-dependent, the effects of thermomechanical couplings, i.e. interactions between the mechanical and the temperature fields in SMA subjected to stress-induced martensite transformation are of key value for their technical applications [1][2][3][4][5][6][7][8][9][10][11][12][13]. Nevertheless, due to some technical problems, investigations into measurements of the temperature variations accompanying the martensite transformation processes in shape memory alloys has been a recent development [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Activity of stress-induced martensite transformation in TiNi shape memory alloy studied by infrared technique

Pieczyska

2010

Journal of Modern Optics

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Infrared imaging and thermomechanical behavior of stress-induced martensite transformation occurring in shape memory alloys is presented. TiNi shape memory alloy specimens have been subjected to a modified program of a stress-controlled tension test, i.e. at various stages of the martensite transformation the loading was kept constant for 3 min. After that the specimen was reloaded to the martensite transformation limit, followed by unloading, when the reverse transformation occurred. During the loading and unloading processes the specimen mechanical parameters and the infrared radiation from the specimen surface were continuously recorded. By comparison of the obtained stress-strain curves and the elaborated temperature characteristics, the current state and the progress of the martensite transformation developing in the shape memory alloy under these conditions has been studied.

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Section: Mechanical and Temperature Characteristics Related To Complementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Activity of stress-induced martensite transformation in TiNi shape memory alloy studied by infrared technique

Pieczyska

2010

Journal of Modern Optics

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“…Due to these characteristics, SMPs have been researched as promising materials for morphing aircraft skins (Keihl et al, 2005). However, SMPs return to their memory shape with lower recovery forces than SMAs, and their fatigue strength is lower than that of SMAs (Tobushi et al, 2009a).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Interfacial Shear Stresses, Shape Fixity, and Actuation Strain in Composites Incorporating Shape Memory Polymers and Shape Memory Alloys

et al. 2015

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Shape memory composites (SMCs) based on shape memory alloys (SMAs) and shape memory polymers (SMPs) allow many design possibilities due to their controllable temperature-dependent mechanical properties. The complementary characteristics of SMAs and SMPs can be utilized in systems with shape recovery created by the SMA and shape fixity provided by the SMP. In this research, three SMC operating regimes are identified and the behavior of SMC structures is analyzed by focusing on composite shape fixity and interfacial stresses. Analytical models show that SMPs can be used to adequately fix the shape of SMA actuators and springs. COMSOL finite element simulations are in agreement with analytical expressions for shape fixity and interfacial stresses. Analytical models are developed for an end-coupled linear SMP-SMA two-way actuator and the predicted strain is shown to be in good agreement with experimental test results.

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“…It should be pointed out that the concept of SMH is different from shape memory composite (SMc) as SMc has at least one SMM (most likely, SMA and/or SMP) as its component (Ratna and Karger-Kocsis 2008;Tobushi et al 2009;Wei et al 1998b).…”

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confidence: 99%

Shape memory hybrids : mechanism and design for tailored properties

Ding¹

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The concept of shape memory hybrid (SMH) is proposed. The underlying mechanism and performance are investigated. The flexibility and versatile in design and fabrication of SMHs with tailored properties are demonstrated in a silicone based system. All types of shape memory phenomena, namely dual-shape memory effect (SME), triple-SME, and mechanical two-way SME, which are most likely found separately in some individual existing shape memory materials (SMMs), but not all in one material, are reproduced in SMHs made of silicone-paraffin wax (S-PW). The underlying mechanisms behind all these phenomena are revealed in details. In addition, the performance of S-PW SMHs is systematically characterized.Multiple-stimuli-responsive SME is achieved in a silicone-sodium acetate trihydrate (S-SAT) SMH, which is not only thermo-responsive and water-responsive, but also pressure-responsive. The last shape memory feature has never been realized in any existing SMMs. Beside the ability for mechanical two-way actuation, shape fixation of S-SAT SMHs can also be quickly achieved by means of tapping.Silicone and melting glue (S-MG) SMHs developed here are not only rubber-like at both high and low temperatures, but also have excellent SME and repeated instant self-healing function. It is proved that while micro sized MG inclusions play a part in the SME, tangled molecular chains of MG (and silicone) contribute to the rubber-like phenomenon and repeated instant self-healing function. Abstract II Based on the working principle of SMHs, electrically conductive SMHs which are suitable for joule heating and with over-heating protection function, SMHs with a narrow transition temperature range (within 4.5 o C), impact-responsive SMHs, high temperature SMHs, and heating/cooling-responsive SMHs are developed.This project presents a systematic study in design, fabrication and characterization of SMHs with tailored properties and features.

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Thermomechanical Properties of Shape-Memory Alloy and Polymer and Their Composites

Cited by 55 publications

References 14 publications

Activity of stress-induced martensite transformation in TiNi shape memory alloy studied by infrared technique

Activity of stress-induced martensite transformation in TiNi shape memory alloy studied by infrared technique

Investigation of Interfacial Shear Stresses, Shape Fixity, and Actuation Strain in Composites Incorporating Shape Memory Polymers and Shape Memory Alloys

Shape memory hybrids : mechanism and design for tailored properties

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