Research update on electroactive shape memory polymer composites and their applications

Zhang, FengHua; Dong, Xinyu; Liu, Yanju; Leng, Jinsong

doi:10.1360/sst-2019-0249

Cited by 5 publications

(1 citation statement)

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“…2 Due to the axial friction force, the coiled tubing is prone to buckle and ''lock up'' in horizontal wells. 3 In view of this situation, many scholars have studied the technical bottleneck of ''locking up'' caused by the coiled tubing buckling. Among them, friction force reducing tools and friction force reducing chemicals are the focuses of the investigation.…”

Section: Introductionmentioning

confidence: 99%

Study on dynamic sealing performance of combined sealing structure of telescopic type of downhole robot by using HTHP coupling method

et al. 2021

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The sealing performance will directly affect the operation of downhole robot under HTHP condition. Traditional analysis methods of sealing performance are that the temperature and pressure is loaded respectively. This can not really evaluate the sealing performance. Besides, the simulation process is: Step 1: pre-compress O-ring to produce contact force. According to the contact pressure, select the compression ratio to calculate the displacement of the slip ring. Step 2: load fluid pressure on the O-ring. This simulation method is to directly load pressure on the undeformed O-ring. However, the O-ring will deform after pre-compression. Therefore, this simulation method is not accurate. In order to make the simulation data more accurate, calculate the data of shape, stress, and strain of O-ring caused by pre-compression caused by assembly. Then, import the deformation body containing the real data of shape, stress, and strain into a new model. On the basis, establish the numerical simulation model of piston, piston guide rod, O-ring, and FTS-ring with HTHP loads is. Finally, calculate and analyze. When the compression ratio of the O-ring is about 14%, the sealing performance is good. What’s more, the distribution of contact stress and Von Mises of the O-ring at 8.3 mm/s of motion speed are analyzed. The results show that the foot shaped combined sealing structure can keep a good dynamic sealing performance under HTHP condition. This paper provides a theoretical basis for the analysis of the dynamic sealing performance by using HTHP coupling method. In the analysis of sealing performance: the hydraulic pressure is loaded to the real model with the real shape, stress, and strain produced by the O-ring assembly. This can more accurately evaluate the sealing performance under HTHP condition. It also provides a reference for the dynamic sealing structure design of downhole tools.

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Section: Introductionmentioning

confidence: 99%

Study on dynamic sealing performance of combined sealing structure of telescopic type of downhole robot by using HTHP coupling method

et al. 2021

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A programable biomimetic actuator with large and reversible deformation based on commercial poly (ethylene-co-vinyl acetate)

Sun

Wang

et al. 2023

Polymer

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Segregated Conductive Carbon Nanotube/Poly(ethylene-co-vinyl acetate) Composites for Low-Voltage Reversible Actuators

Sun

Jia

et al. 2022

Ind. Eng. Chem. Res.

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Electrically conductive shape-memory polymer composites have attracted great interest for electrical actuators because of their remote controlling capability, whereas plentiful conductive fillers are always required to achieve low-voltage actuation, which would cause degraded processability and also weaken the intrinsic feature of the shape-memory polymer matrix. The realization of low-voltage actuation with preserved actuating performance of shape-memory polymers is significant for practical application but is still challenging. Herein, we develop a novel electrically reversible actuator that can be actuated at only 15 V based on a segregated carbon nanotube (CNT)/poly(ethylene-covinyl acetate) (EVA) composite with CNTs selectively distributed on the interfaces among the polyhedral EVA regions. The segregated CNT networks endow the composite with low-voltage actuating ability, and the intrinsic characteristics of EVA endow the composite with reversible actuation. Moreover, the selectively distributed state can significantly reduce the obstruction effect of CNTs on EVA molecular chain movement during the actuating and recovery process, in comparison to the conventionally distributed state. The resultant segregated CNT/EVA has a higher reversible actuation of 5% than the conventional CNT/EVA composite (2%), even with 10 wt % CNT loading. The structural changes of these two composites were evaluated by wide-angle Xray scattering to explore the mechanism of the actuation superiority for segregated structures. Based on excellent reversible actuation, the segregated CNT/EVA was proven to assemble multifunctional actuators to realize various applications (flipping signs and lifting objects), providing inspiration in electrical actuators and biomimetic application.

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Research update on electroactive shape memory polymer composites and their applications

Cited by 5 publications

References 0 publications

Study on dynamic sealing performance of combined sealing structure of telescopic type of downhole robot by using HTHP coupling method

Study on dynamic sealing performance of combined sealing structure of telescopic type of downhole robot by using HTHP coupling method

A programable biomimetic actuator with large and reversible deformation based on commercial poly (ethylene-co-vinyl acetate)

Segregated Conductive Carbon Nanotube/Poly(ethylene-co-vinyl acetate) Composites for Low-Voltage Reversible Actuators

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