Dataset Information

Improving the Deformability and Recovery Moment of Shape Memory Polymer Composites for Bending Actuators: Multiple Neutral Axis Skins and Deployable Core.

ABSTRACT: Shape memory polymer composite (SMPC) actuators have received significant attention for applications in space deployable structures because of their light weight and simple actuating process without any additional components. However, conventional SMPC actuators exhibit limited deformation owing to damages caused by the slight elongation of fibers and microbuckling. In this study, we designed a sandwich-structured SMPC bending actuator to increase deformability and the recovery moment with two novel features: multiple neutral axis (MNA) skins and a deployable core. The MNA skins were fabricated as layered structures of a soft layer (the polydimethylsiloxane/ethoxylated polyethylenimine layer) and hard layers (the SMPC layer) based on the MNA effect derived from the large modulus difference between the soft and hard layers. Under the bending deformation, the large shear strain in the soft layer significantly decreases the axial strain in SMPC layers and increases deformability. Applying the deployable core on the sandwich-structured SMPC bending actuator increases the recovery moment owing to the deploying force of the core. To the best of our knowledge, the sandwich-structured SMPC bending actuator composed of two MNA skins and a deployable core yielded the world's largest width-normalized recovery moment of 51.2 N·m/m with the smallest bending radius of 15 mm.

SUBMITTER: Kang D

PROVIDER: S-EPMC10360064 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Improving the Deformability and Recovery Moment of Shape Memory Polymer Composites for Bending Actuators: Multiple Neutral Axis Skins and Deployable Core.

Kang Dajeong D Jeong Jae-Moon JM Jeong Kwang Il KI Kim Seong Su SS

ACS applied materials & interfaces 20230626 28

Shape memory polymer composite (SMPC) actuators have received significant attention for applications in space deployable structures because of their light weight and simple actuating process without any additional components. However, conventional SMPC actuators exhibit limited deformation owing to damages caused by the slight elongation of fibers and microbuckling. In this study, we designed a sandwich-structured SMPC bending actuator to increase deformability and the recovery moment with two n ...[more]

PMID: 37358080

Shared Molecules

Only show the datasets with similarity scores above: 0.5

Threshold

0.5

Similar Datasets

Project description:Electromechanical coupling defines the ratio of electrical and mechanical energy exchanged during a flexure cycle of a piezoelectric actuator. This paper presents an analysis of the dynamic electromechanical coupling factor (dynamic EMCF) for cantilever based piezoelectric actuators and provides for the first time explicit expressions for calculation of dynamic EMCF based on arrangement of passive and active layers, layer geometry, and active and passive materials selection. Three main cantilever layer configurations are considered: unimorph, dual layer bimorph and triple layer bimorph. The actuator is modeled using standard constitutive dynamic equations that relate deflection and charge to force and voltage. A mode shape formulation is used for the cantilever dynamics that allows the generalized mass to be the actual mass at the first resonant frequency, removing the need for numerical integration in the design process. Results are presented in the form of physical insight from the model structure and also numerical evaluations of the model to provide trends in dynamic EMCF with actuator design parameters. For given material properties of the active and passive layers and given system overall damping ratio, the triple layer bimorph topology is the best in terms of theoretically achievable dynamic EMCF, followed by the dual layer bimorph. For a damping ratio of 0.035, the dynamic EMCF for an example dual layer bimorph configuration is 9% better than for a unimorph configuration. For configurations with a passive layer, the ratio of thicknesses for the passive and active layers is the primary geometric design variable. Choice of passive layer stiffness (Young's modulus) relative to the stiffness of the material in the active layer is an important materials related design choice. For unimorph configurations, it is beneficial to use the highest stiffness possible passive material, whereas for triple layer bimorph configurations, the passive material should have a low stiffness. In all cases, increasing the transverse electromechanical coupling coefficient of the active material improves the dynamic EMCF.

Dataset Information

Improving the Deformability and Recovery Moment of Shape Memory Polymer Composites for Bending Actuators: Multiple Neutral Axis Skins and Deployable Core.

Publications

Improving the Deformability and Recovery Moment of Shape Memory Polymer Composites for Bending Actuators: Multiple Neutral Axis Skins and Deployable Core.

Shared Molecules

Only show the datasets with similarity scores above: 0.5

Threshold

0.5

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets