scholarly journals Variable stiffness corrugated composite structure with shape memory polymer for morphing skin applications

2017 ◽  
Vol 26 (3) ◽  
pp. 035052 ◽  
Author(s):  
Xiaobo Gong ◽  
Liwu Liu ◽  
Fabrizio Scarpa ◽  
Jinsong Leng ◽  
Yanju Liu
Keyword(s):  
Shape Memory ◽  
Composite Structure ◽  
Shape Memory Polymer ◽  
Variable Stiffness

Design of variable stiffness fixture for computerized embroidery machine based on shape memory polymer

2022 ◽  
pp. 1045389X2110721
Author(s):  
Yawen Yang ◽  
Lei Tian ◽  
Xi Chen ◽  
Jiayuan Wang ◽  
Yongyan Zhang ◽  
...  
Keyword(s):  
Shape Memory ◽  
Material Properties ◽  
Room Temperature ◽  
Working Condition ◽  
Raw Materials ◽  
Shape Memory Polymer ◽  
Variable Stiffness ◽  
Fixture Design ◽  
Stiffness Characteristic ◽  
The Relationship

It is a challenge to handle the metal fixture used for cloth clamping in a computerized embroidery machine because of its fixed stiffness. Herein, a prototype that acts as a fixture to provide variable stiffness property is explored by discussing the potential of a thermal-sensitive epoxy resin-based shape memory polymer (SMP). The general model of fixture design is obtained after analyzing the working condition of the metal fixture. The structure of the SMP fixture is designed by discussing the material properties and working requirements of SMP, and a theoretical model is established to deduce the relationship between thickness and stiffness of the fixture. Six SMP fixtures that memorized clamping and opening state were manufactured with different proportions of raw materials. The results show that the designed fixtures have a lighter weight but higher clamping force than the metal fixture at room temperature (RT). It is the first work that demonstrates the potential of the SMP fixture to replace the metal fixture in the computerized embroidery machine and provides inspiration for product design with variable stiffness characteristic in engineering.

scholarly journals Shape memory polymer-based hybrid honeycomb structures with zero Poisson’s ratio and variable stiffness

2017 ◽  
Vol 179 ◽  
pp. 437-443 ◽  
Author(s):  
Jian Huang ◽  
Qiuhua Zhang ◽  
Fabrizio Scarpa ◽  
Yanju Liu ◽  
Jinsong Leng
Keyword(s):  
Shape Memory ◽  
Poisson’S Ratio ◽  
Shape Memory Polymer ◽  
Variable Stiffness ◽  
Poisson's Ratio ◽  
Honeycomb Structures

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.

scholarly journals Thermoset Shape Memory Polymer Variable Stiffness 4D Robotic Catheters

2021 ◽  
pp. 2103277
Author(s):  
Michael Mattmann ◽  
Carmela De Marco ◽  
Francesco Briatico ◽  
Stefano Tagliabue ◽  
Aron Colusso ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Memory Polymer ◽  
Variable Stiffness

A variable stiffness morphing skin: preparation and properties

2021 ◽  
Author(s):  
Xiaoming Ren ◽  
Guangming Zhu
Keyword(s):  
Molecular Weight ◽  
Shape Memory ◽  
Mass Fraction ◽  
Shape Recovery ◽  
Shape Memory Polymer ◽  
Variable Stiffness ◽  
Promising Candidate ◽  
Skin Preparation ◽  
Out Of Plane ◽  
Shape Fixity

Abstract In the course of flight, morphing skins play an important role in morphing aircrafts. Shape memory polymer (SMP) with variable stiffness performance is a good candidate material for skin. In this paper, a series of SMP morphing skins were prepared from hydro-epoxy resin (HEP), carboxyl-terminated butadiene acrylonitrile (CTBN) and maleic anhydride (MA). By adjusting molecular weight and content of CTBN, in-plane properties and out-of-plane properties of morphing skins can be adjusted. Due to the in-plane tensile stress acting on the skin during flight, tensile test was carried out to study its in-plane performance. After testing, skin can resist maximum in-plane tensile strength of 63.7 MPa. As for the out-of-plane performance of the skin, shape memory test was studied in this paper. All morphing skins have 100% shape fixity rate (Rf) and fast shape recovery rate (Rr). When toughened by CTBN of 10% of 4000 molecular weight with a mass fraction, the skin can recover its out-of-plane deformed shape in 33s. The SMP skins were proved to be a promising candidate for morphing skins.

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