A shape-memory soft actuator integrated with reversible electric/moisture actuating and strain sensing

Xing, Shuting; Wang, Ping-ping; Liu, Shuqi; Xu, Yun; Zheng, Rongmin; Deng, Zhi‐fu; Peng, Zefei; Li, Jun‐yun; Wu, Yaoyi; Liu, Lan

doi:10.1016/j.compscitech.2020.108133

Cited by 61 publications

(37 citation statements)

References 37 publications

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“…The matrix polymer is a Styrene-based thermoset SMP resin T g = 62 • C which is commercially available by Cornerstone Research Group (CRG) Industries (OH, United States) [54] under the name of Veriflex. The glass micro-balloons (Q-CEL6014) have an 85 mm average outer diameter, an effective density of 0.14 g/cm 3 , and a wall thickness of 0.8 mm. Figure 4b shows that microspheres occupy the matrix only partially, which prevents the excessive presence of voids in the matrix and thus improves its mechanical properties as compared to PU foams.…”

Section: Pu Smp Foamsmentioning

confidence: 99%

“…While inserted into the human body via small catheters, they can be miniaturized, deformed, and consequently, regain a larger pre-set shape in the right position [1]. In addition, soft robotics has benefited significantly from using SMP foams [2][3][4]. Applications of two-way and multiple-way SMPs in soft robotics had been reviewed by Scalet [5].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Finite Element Modelling of Thermo-Visco-Plastic Styrene and Polyurethane Shape Memory Polymer Foams

et al. 2021

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This paper presents nonlinear finite element (FE) models to predict time- and temperature-dependent responses of shape memory polymer (SMP) foams in the large deformation regime. For the first time, an A SMP foam constitutive model is implemented in the ABAQUS FE package with the aid of a VUMAT subroutine to predict thermo-visco-plastic behaviors. A phenomenological constitutive model is reformulated adopting a multiplicative decomposition of the deformation gradient into thermal and mechanical parts considering visco-plastic SMP matrix and glass microsphere inclusions. The stress split scheme is considered by a Maxwell element in parallel with a hyper-elastic rubbery spring. The Eyring dashpot is used for modelling the isotropic resistance to the local molecular rearrangement such as chain rotation. A viscous flow rule is adopted to prescribe shear viscosity and stress. An evolution rule is also considered for the athermal shear strengths to simulate macroscopic post-yield strain-softening behavior. In order to validate the accuracy of the model as well as the solution procedure, the numerical results are compared to experimental responses of Styrene and Polyurethane SMP foams at different temperatures and under different strain rates. The results show that the introduced FE modelling procedure is capable of capturing the major phenomena observed in experiments such as elastic and elastic-plastic behaviors, softening plateau regime, and densification.

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Section: Pu Smp Foamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear Finite Element Modelling of Thermo-Visco-Plastic Styrene and Polyurethane Shape Memory Polymer Foams

et al. 2021

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“…Piezoelectric actuators have many industrial applications, such as in musical instruments’ parts, phones, or complex music systems. In medicine, piezoelectric actuators are widely investigated in endoscope lenses, small pumps, and other applications [ 178 ].…”

Section: Organic Piezoelectric Materialsmentioning

confidence: 99%

Progress in the Applications of Smart Piezoelectric Materials for Medical Devices

2020

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Smart piezoelectric materials are of great interest due to their unique properties. Piezoelectric materials can transform mechanical energy into electricity and vice versa. There are mono and polycrystals (piezoceramics), polymers, and composites in the group of piezoelectric materials. Recent years show progress in the applications of piezoelectric materials in biomedical devices due to their biocompatibility and biodegradability. Medical devices such as actuators and sensors, energy harvesting devices, and active scaffolds for neural tissue engineering are continually explored. Sensors and actuators from piezoelectric materials can convert flow rate, pressure, etc., to generate energy or consume it. This paper consists of using smart materials to design medical devices and provide a greater understanding of the piezoelectric effect in the medical industry presently. A greater understanding of piezoelectricity is necessary regarding the future development and industry challenges.

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“…The electrothermal control method is different from the high-voltage driving of an electronic electroactive polymer (EAP), as the ionic EAP needs to function in the electrolyte. Its low-voltage operation, without the limitation of the need for a specific environment, and easy operation make it widely used in human-computer interaction, [8] optics, [9] DOI: 10.1002/mame.202100690 sensing, [10][11][12] smart switches, [13] electromagnetic shielding, [14][15][16] soft mechanical grasper, [17] and various other fields.…”

Section: Introductionmentioning

confidence: 99%

Low Voltage and Low Temperature Soft Electrothermal Actuator Based on PE/Graphite Bilayer Film

Yanni

Chen

et al. 2021

Macro Materials & Eng

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Soft electrothermal actuators are widely used in soft robots, smart switches, medical devices, artificial muscles, and human-machine interactions. Generally, they operate at room temperature but also meet the safety standards for maximum safe voltage for a human body. Therefore, an actuator with a lower voltage and lower temperature is the first choice, as long as the performance is not affected. In this study, a bilayer film based on polythene (PE)/graphite is used to realize an electrothermal drive. The method is simple, inexpensive, and convenient for mass production. At a low driving voltage of between 1.5 and 2 V, and at a temperature of 40-52 °C, a maximum bending angle of 139.22°-470°. Through the demonstration of a micromechanical gripper and transportation illustrated by drug crawling, it is proven that the PE/graphite composite membrane can be widely applied in the field of soft actuators.

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A shape-memory soft actuator integrated with reversible electric/moisture actuating and strain sensing

Cited by 61 publications

References 37 publications

Nonlinear Finite Element Modelling of Thermo-Visco-Plastic Styrene and Polyurethane Shape Memory Polymer Foams

Nonlinear Finite Element Modelling of Thermo-Visco-Plastic Styrene and Polyurethane Shape Memory Polymer Foams

Progress in the Applications of Smart Piezoelectric Materials for Medical Devices

Low Voltage and Low Temperature Soft Electrothermal Actuator Based on PE/Graphite Bilayer Film

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