Twisted Polymer Fiber Research Articles

Modeling and characterization for straight twisted polymer fiber actuators in blocked torsion: effect of radial thermal expansion

This paper discusses a new model and experimental characterization for thermal responses of straight twisted polymer fiber (TPF) actuators in blocked torsion. The proposed model is derived from combining the fiber stiffness matrix with Shafer’s model of free torsion. The derived model predicts that the blocking torque increases as the initial twist increases. Although it is not widely recognized, the tension of a straight TPF decreases as the initial torsion increases, and this paper explains this fact. The proposed model predicts the decrease in tension by using Shafer’s kinematic model that considers the effect of radial thermal expansion. Experimental characterization and model verification are performed using nylon 6 (polyamide 6) fiber samples with ten different initial twists, ranging from weak to strong. The results indicate that as the initial twist increases, the torque increases and the tension decreases. The tension fluctuates with respect to time. The experimental results show that the shear modulus increases as the initial twist increases. The predictions of the proposed model are reasonably consistent with the experimental thermal responses of straight TPFs in blocked torsion when the constants obtained by experimental characterization are used.

Modeling and Control of Twisted and Coiled Polymer Fiber Actuator and Twisted Polymer Fiber Actuator

Modeling and Control of Twisted and Coiled Polymer Fiber Actuator and Twisted Polymer Fiber Actuator

Development of Twisted Polymer Fiber Actuator for Automotive Applications

Development of Twisted Polymer Fiber Actuator for Automotive Applications

The Effect of Twisted Polymer Fiber on Physical and Mechanical Characteristics of Concrete C35

Concrete as the most used material, is known as an integral part of construction. So far, many studies have been done in the field of improving the quality of concrete that most of them have examined change in concrete mix which is called concrete mix plan. However, the use of additives and also replacing commonly used materials in concrete with new materials always has been noteworthy. In this study, description of tests that have been done on fiber reinforced concrete will be discussed. Also, the condition of concrete mix plan will be discussed. Comparison between results of the tests showed that Forta reinforced concretes have more compressive, flexural and tensile strength and modulus of elasticity than normal and ordinary concretes.Journal of the Institute of Engineering, 2018, 14(1): 126-135

複数の釣糸アクチュエータを用いた２自由度マニピュレータの位置・剛性制御

A fishing line actuator is one of the soft actuators made by coiling a twisted polymer fiber. In this paper, we propose 2 DOF manipulator driven by the multiple fishing line actuators to realize a joint angle control and a variable stiffness independently. The effectiveness of the proposed mechanism is evaluated experimentally.