scholarly journals Shape Memory Polymer Composite Actuator: Modeling Approach for Preliminary Design and Validation

Actuators ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 51 ◽  
Author(s):  
Salvatore Ameduri ◽  
Monica Ciminello ◽  
Antonio Concilio ◽  
Fabrizio Quadrini ◽  
Loredana Santo
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Critical Role ◽  
Solar Sails ◽  
Modeling Approach ◽  
Aerospace Applications ◽  
Actuation System ◽  
Smart Actuator ◽  
Definition Of ◽  
Specific Modeling

The work at hand focuses on the modeling, prototyping, and experimental functionality test of a smart actuator based on shape memory polymer technology. Particular attention is paid to the specific modeling approach, here conceived as an effective predictive scheme, quick and, at the same time, able to face those nonlinearity aspects, strictly related to the large displacements shape memory polymers usually undergo. Shape memory polymer composites (SMPCs) may play a critical role for many applications, ranging from self-repairing systems to deployable structures (e.g., solar sails, antennas) and functional subcomponents (e.g., pliers, transporters of small objects). For all these applications, it is very important to have an effective tool that may drive the designers during the preliminary definition of the main parameters of the actuation system. For the present work, a SMPC plate sample has been conceived and realized in view of aerospace applications. An external fibre optic sensor has been then fixed with special adhesive. The temperatures needed for the activation of the Shape Memory Polymer (SMP) and strain storing have been provided by a thermo-gun and complete load–unload cycles, including strain storing, have been performed. Experimental displacements and strains have been used to validate a dedicated predictive theoretical approach, suited for laminates integrated with SMP layers.

scholarly journals 3D Printed Shape Memory Polymers Produced via Direct Pellet Extrusion

Micromachines ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 87
Author(s):  
Trenton Cersoli ◽  
Alexis Cresanto ◽  
Callan Herberger ◽  
Eric MacDonald ◽  
Pedro Cortes
Keyword(s):  
3D Printing ◽  
Shape Memory ◽  
Memory Performance ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Qr Code ◽  
Thermal Stimulus ◽  
Conventional Film ◽  
3D Printed ◽  
Smart Actuator

Shape memory polymers (SMPs) are materials capable of changing their structural configuration from a fixed shape to a temporary shape, and vice versa when subjected to a thermal stimulus. The present work has investigated the 3D printing process of a shape memory polymer (SMP)-based polyurethane using a material extrusion technology. Here, SMP pellets were fed into a printing unit, and actuating coupons were manufactured. In contrast to the conventional film-casting manufacturing processes of SMPs, the use of 3D printing allows the production of complex parts for smart electronics and morphing structures. In the present work, the memory performance of the actuating structure was investigated, and their fundamental recovery and mechanical properties were characterized. The preliminary results show that the assembled structures were able to recover their original conformation following a thermal input. The printed parts were also stamped with a QR code on the surface to include an unclonable pattern for addressing counterfeit features. The stamped coupons were subjected to a deformation-recovery shape process, and it was observed that the QR code was recognized after the parts returned to their original shape. The combination of shape memory effect with authentication features allows for a new dimension of counterfeit thwarting. The 3D-printed SMP parts in this work were also combined with shape memory alloys to create a smart actuator to act as a two-way switch to control data collection of a microcontroller.

Piezoelectric Energy Harvester Adjusted by Light-Induced Actuator

2016 ◽  
Vol 851 ◽  
pp. 526-531
Author(s):  
Ya Na Mao ◽  
Guo Jin Chen
Keyword(s):  
Shape Memory ◽  
Output Power ◽  
Energy Harvester ◽  
Shape Memory Polymer ◽  
Excitation Frequency ◽  
Variable Stiffness ◽  
Laminated Beam ◽  
Piezoelectric Energy ◽  
Piezoelectric Layers ◽  
Smart Actuator

Shape-memory polymer has two different effects, i.e. shape memory effect and variable stiffness effect. Significant Young’s modulus changes when an external stimulus is applied. Light-induced shape memory polymer exhibits great potential in application of actuators because of its reconfigurableness, adaptiveness and non-contact control. In this paper, a smart actuator based on light-induced shape memory polymer is applied to improve the output power of piezoelectric energy harvester. This energy harvester is a laminated beam structure which includes five layers. Two piezoelectric layers are attached on the upper and lower surfaces of substrate layer. Then two light-induced actuators are bonded on the piezoelectric layers to adjust the frequency of this laminated beam via variable stiffness effect. Output power of the energy harvester could be promoted after the light-induced actuation since the natural frequency approaching the excitation frequency.

Shape Recovery of Polymeric Matrix Composites by Irradiation

2016 ◽  
Vol 879 ◽  
pp. 1645-1650 ◽  
Author(s):  
Loredana Santo ◽  
Denise Bellisario ◽  
Fabrizio Quadrini
Keyword(s):  
Shape Memory ◽  
Fiber Composite ◽  
Shape Memory Polymer ◽  
Recovery Phase ◽  
Initial Configuration ◽  
Conventional Heating ◽  
Carbon Fiber Composite ◽  
Space Applications ◽  
Aerospace Applications ◽  
Air Gun

Shape memory composite (SMC) structures are of great interest for the aerospace applications. In previous works, the authors have studied SMC lab-scale deploying prototypes manufactured by using two carbon fiber composite layers with a shape memory polymer interlayer. The prototypes were produced in an initial configuration and subsequently it was changed in the memorizing step. The initial configuration was then recovered by heating. Memorization and recovery phases were performed by means of conventional heating (by hot air gun or heater plate). In this work, for the first time the authors evaluate the SMC heating by means of radiating lamps. A square plate was purposely produced and recovered after different memory steps. Time, temperature and recovery are measured during and after the tests. The radiating lamp power and type, and the distance of the SMC from the lamp are fundamental parameters for the heating phase. As result of the irradiation tests, the initial configuration can be successfully recovered without failures. This study is especially aimed to future space applications in which the deployment (recovery) phase will be initiated only by exposure to solar radiation.

Analysis of Shape Memory Polymer-Alloy Composites: Modeling and Parametric Studies

2012 ◽  
Author(s):  
Jungkyu Park ◽  
Leon M. Headings ◽  
Marcelo J. Dapino ◽  
Jeffery W. Baur ◽  
Gyaneshwar P. Tandon
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Analytical Models ◽  
Temperature Dependent ◽  
Interfacial Stresses ◽  
Actuation System ◽  
Shape Memory Composites ◽  
Parametric Studies ◽  
Analytical Expressions ◽  
Shape Fixity

Shape memory composites (SMCs) based on shape memory alloys (SMAs) and shape memory polymers (SMPs) are interesting due to their controllable temperature-dependent mechanical properties. The complementary characteristics of SMAs and SMPs can be used to create materials or 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 fixity and interfacial stresses. Analytical models show that certain SMPs can achieve sufficient shape fixing. COMSOL Multi-Physics 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 actuation system.

Four-dimensional printed self-deploying circular structures with large folding ratio inspired by origami

2020 ◽  
Vol 31 (18) ◽  
pp. 2128-2136
Author(s):  
Shuai Liu ◽  
Qing-Sheng Yang ◽  
Ran Tao
Keyword(s):  
Shape Memory ◽  
Large Scale ◽  
Shape Memory Polymer ◽  
Smart Structures ◽  
Stable States ◽  
Dynamic Mechanical Analyzer ◽  
Solar Sails ◽  
Element Simulation ◽  
Circular Structures ◽  
Dimensional Printing

Inspired by the origami, a series of smart circular structures with large folding ratio was designed and fabricated by four-dimensional printing in this article. The structure consists of the crease and plate parts by embedding the Miura-ori into a folding fan, and has the characteristics of bi-stable states and self-deployment by introducing soft and hard shape memory polymers. The shape memory polymer material parameters were obtained by the dynamic-mechanical analyzer, and then the constitutive equation can be determined. To demonstrate the folding and deployment performance of the smart structures, the experiment and finite element simulation was carried out. It is shown that the structures can repeatedly be folded and deployed by temperature-controlled shape memory effect of shape memory polymer. This design can be applied to the large-scale and multiple level smart structures such as antennas and deployable solar sails.

A unified modeling approach for amorphous shape memory polymers and shape memory polymer based syntactic foam

2016 ◽  
Vol 27 (9) ◽  
pp. 1237-1245 ◽  
Author(s):  
Jianping Gu ◽  
Huiyu Sun ◽  
Jianshi Fang ◽  
Changqing Fang ◽  
Zhenqin Xu
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Syntactic Foam ◽  
Shape Memory Polymers ◽  
Unified Modeling ◽  
Modeling Approach

scholarly journals Design of Shape Memory Thermoplastic Material Systems for FDM-Type Additive Manufacturing

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4254
Author(s):  
Paulina A. Quiñonez ◽  
Leticia Ugarte-Sanchez ◽  
Diego Bermudez ◽  
Paulina Chinolla ◽  
Rhyan Dueck ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Shape Memory ◽  
Thermomechanical Processing ◽  
Material Selection ◽  
Shape Memory Polymer ◽  
Fused Filament Fabrication ◽  
Materials Development ◽  
Thermoplastic Material ◽  
Polymer Systems ◽  
Injection Molded

The work presented here describes a paradigm for the design of materials for additive manufacturing platforms based on taking advantage of unique physical properties imparted upon the material by the fabrication process. We sought to further investigate past work with binary shape memory polymer blends, which indicated that phase texturization caused by the fused filament fabrication (FFF) process enhanced shape memory properties. In this work, two multi-constituent shape memory polymer systems were developed where the miscibility parameter was the guide in material selection. A comparison with injection molded specimens was also carried out to further investigate the ability of the FFF process to enable enhanced shape memory characteristics as compared to other manufacturing methods. It was found that blend combinations with more closely matching miscibility parameters were more apt at yielding reliable shape memory polymer systems. However, when miscibility parameters differed, a pathway towards the creation of shape memory polymer systems capable of maintaining more than one temporary shape at a time was potentially realized. Additional aspects related to impact modifying of rigid thermoplastics as well as thermomechanical processing on induced crystallinity are also explored. Overall, this work serves as another example in the advancement of additive manufacturing via materials development.

Autonomous Off‐Equilibrium Morphing Pathways of a Supramolecular Shape‐Memory Polymer

2021 ◽  
pp. 2102473
Author(s):  
Wenjun Peng ◽  
Guogao Zhang ◽  
Qian Zhao ◽  
Tao Xie
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer
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