Термомеханический анализ эффекта памяти формы полиуретанового композита, используемого для создания развертываемых конструкций космического назначения

The possibility of using a three-point bending clamp thermomechanical analyzer for study the shape memory effect of a constructional polyurethane composite is investigated. The viscoelastic properties of the sample in the region of the transition from the glassy to the highly elastic state are studied. The parameters affecting the recovery rate of the original form (Rr) and the fixation factor of the temporary form (Rf) are determined. The conditions for deforming and cooling the polyurethane composite are established, which allow to achieve the values of Rr = 99.98% and Rf = 99.70%.

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The Effect of Subsequent Stress-Induced Martensite Aging on the Viscoelastic Properties of Aged NiTiHf Polycrystals

Metals ◽

10.3390/met11121890 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1890

Author(s):

Anton I. Tagiltsev ◽

Elena Y. Panchenko ◽

Ekaterina E. Timofeeva ◽

Yuriy I. Chumlyakov ◽

Ekaterina S. Marchenko ◽

...

Keyword(s):

Elastic Modulus ◽

Martensitic Transformation ◽

Internal Friction ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Viscoelastic Properties ◽

Oriented Growth ◽

Compressive Stresses ◽

Significant Change

This study investigated the effect of stress-induced martensite aging under tensile and compressive stresses on the functional and viscoelastic properties in Ni50.3Ti32.2Hf17.5 polycrystals containing dispersed H-phase particles up to 70 nm in size obtained by preliminary austenite aging at 873 K for 3 h. It was found that stress-induced martensite aging at 428 K for 12 h results in the appearance of a two-way shape memory effect of −0.5% in compression and +1.8% in tension. Moreover, a significant change in viscoelastic properties can be observed: an increase in internal friction (by 25%) and a change in elastic modulus in tensile samples. The increase in internal friction during martensitic transformation after stress-induced martensite aging is associated with the oriented growth of thermal-induced martensite. After stress-induced martensite aging, the elastic modulus of martensite (EM) increased by 8 GPa, and the elastic modulus of austenite (EA) decreased by 8 GPa. It was shown that stress-induced martensite aging strongly affects the functional and viscoelastic properties of material and can be used to control them.

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Thermomechanical Analysis of the Shape Memory Effect of a Polyurethane Composite Used to Create Deployable Space Structures

Technical Physics Letters ◽

10.1134/s1063785019050171 ◽

2019 ◽

Vol 45 (5) ◽

pp. 453-456 ◽

Cited By ~ 1

Author(s):

T. A. Shalygina ◽

S. Yu. Voronina ◽

A. Yu. Vlasov ◽

K. A. Pasechnik ◽

I. V. Obvertkin

Keyword(s):

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Thermomechanical Analysis ◽

Space Structures ◽

Polyurethane Composite

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Актуатор с последовательным соединением стержня из сплава с памятью формы и упругого элемента смещения

Механика композиционных материалов и конструкций ◽

10.33113/mkmk.ras.2021.27.02.169_190.02 ◽

2021 ◽

Vol 27 (2) ◽

pp. 169-190

Author(s):

А. А. Мовчан ◽

◽

Н. М. Экстер ◽

Keyword(s):

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Mechanical Action ◽

Original Form ◽

Elastic Rod ◽

Direct Transformation ◽

System Parameters ◽

In Series ◽

Working Bodies

One of the most promising applications of shape memory alloys (SMA) is their use for creating working bodies of power exciters (actuators). The working body of the actuator must perform certain movements due to shape memory phenomena (heating, working stroke of the actuator) and the accumulation of direct transformation deformations (cooling, idling of the actuator). It is known that the process of deformation of SMA during cooling occurs only in the presence of mechanical action, while the return to the original form during heating occurs in the absence of a corresponding mechanical action and even in the presence of a sufficiently large counteraction. To ensure the possibility of not only working, but also idling of the actuator, the working body of the SMA is connected to the elastic bias element so that both of these elements are deformed together. In this case, when the SMA element is heated, it is deformed due to the shape memory phenomenon, which leads to the deformation of the bias element associated with the working body and the appearance, both in this element and in the working body, of mechanical stresses that increase with the temperature of the SMA element. It is these stresses, which continue to act during the cooling of the working body, that ensure its deformation in the opposite direction at the stage of cooling of the working body and the corresponding direct transformation into SMA. In this paper, the behavior of an actuator consisting of a SMA rod and an elastic rod (an bias element) connected in series, the total length of which is assumed to be unchanged, is analytically investigated. The influence of the system parameters on the stresses in the SMA rod and the value of the working stroke of the actuator is investigated. The conditions for the implementation of the closed two way shape memory effect in this system are determined.

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Development of Fe-Mn-Si-Cr Shape Memory Alloy Fiber Reinforced Plaster-Based Smart Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.2063 ◽

2005 ◽

Vol 475-479 ◽

pp. 2063-2066 ◽

Cited By ~ 4

Author(s):

Teppei Wakatsuki ◽

Yoshimi Watanabe ◽

Hiroshi Okada

Keyword(s):

Shape Memory Alloy ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Tensile Strain ◽

Bending Test ◽

Fiber Reinforced ◽

Three Point Bending ◽

Smart Composites ◽

Fiber Holder

In previous studies, it has been found that the shape memory effect of the embedded straight and wavy shape memory alloy (SMA) fibers enhance the strength and energy absorption prior to fracture of the composite, where the embedded SMA fibers shrink due to their shape memory effect. In the case of wavy fiber reinforced composites, the SMA fibers were subjected to pre-tensile strain using fiber holder with rotatable rollers to maintain the constant periodicity and amplitude of wavy fibers. In this study, on the other hand, the wavy SMA fibers were subjected to pre-tensile strain without using fiber holder, and therefore, periodicity and amplitude of wavy fibers were varied during the deformation. Then the wavy SMA fiber reinforced smart composite is fabricated. For the mechanical property characterization, three-point bending test is performed for the specimens.

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Эффект памяти тройной формы полиуретанового композиционного материала

Письма в журнал технической физики ◽

10.21883/pjtf.2020.20.50156.18251 ◽

2020 ◽

Vol 46 (20) ◽

pp. 42

Author(s):

Т.А. Шалыгина ◽

С.Ю. Воронина ◽

А.Ю. Власов ◽

К.А. Пасечник ◽

И.В. Обверткин ◽

...

Keyword(s):

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Carbon Fibers ◽

Structural Changes ◽

Scanning Calorimetry ◽

Adhesion Mechanism ◽

Thermomechanical Characteristics ◽

Polyurethane Composite ◽

Triple Shape Memory

The effect of the carbon fibers coupling layer on the occurrence of the triple-shape memory effect of polyurethane reinforced is studied. Using thermomodulated differential scanning calorimetry, structural changes in a sample of Carbon fiber reinforced polyurethane with coupling layer were determined. The influence of the diffusion adhesion mechanism on the thermomechanical characteristics of the triple-shape memory effect of the polyurethane composite material is established.

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The Triple-Shape Memory Effect of Polyurethane Composite Material

Technical Physics Letters ◽

10.1134/s1063785020100284 ◽

2020 ◽

Vol 46 (10) ◽

pp. 1036-1040

Author(s):

T. A. Shalygina ◽

S. Yu. Voronina ◽

A. Yu. Vlasov ◽

K. A. Pasechnik ◽

I. V. Obvertkin ◽

...

Keyword(s):

Composite Material ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Polyurethane Composite ◽

Triple Shape Memory

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Tensile Failure of 55-Nitinol Wire

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100113858 ◽

1975 ◽

Vol 33 ◽

pp. 46-47

Author(s):

F. I. Grace

Keyword(s):

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Stoichiometric Composition ◽

Tensile Failure ◽

Initial State ◽

Initial Shape ◽

Nitinol Wire ◽

Cscl Type ◽

Shear Transformation

An interest in NiTi alloys with near stoichiometric composition (55 NiTi) has intensified since they were found to exhibit a unique mechanical shape memory effect at the Naval Ordnance Laboratory some twelve years ago (thus refered to as NITINOL alloys). Since then, the microstructural mechanisms associated with the shape memory effect have been investigated and several interesting engineering applications have appeared.The shape memory effect implies that the alloy deformed from an initial shape will spontaneously return to that initial state upon heating. This behavior is reported to be related to a diffusionless shear transformation which takes place between similar but slightly different CsCl type structures.

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