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Polymers
Special Issues
Behaviour Analysis of Polymeric Composite Material Structures
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Behaviour Analysis of Polymeric Composite Material Structures

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Processing and Engineering".

Deadline for manuscript submissions: closed (25 March 2022) | Viewed by 4504

Special Issue Editor

Prof. Dr. Ionel Chirica

E-Mail Website
Guest Editor
Department of Mechanical Engineering, "Dunarea de Jos" University, 800201 Galati, Romania
Interests: mechanics of composite materials; polimers strength analysis; applied mechanics; finite element analysis; vibrations; ship structures analysis

Special Issue Information

Dear Colleagues,

The Special Issue introduces the methods of analysis of polymeric composite material structures and combines classical lamination theory with macromechanical failure principles for the prediction and optimization of composite structural performance. It addresses topics such as available compounds, high-strength fibres, and the behaviour of anisotropic, orthotropic, and transversely isotropic materials and structures subjected to various loadings. The composite material structures’ behaviour can be simulated by using an appropriate morphological law. Many models should be analysed through three-dimensional composite structures and two-dimensional cumulative size distributions. Numerical and experimental models that will help to find the best results for polymeric composite structures’ behaviour regarding bending, torsion, buckling, postbuckling, and failure are expected to be developed. The analysis will focus on perfect and imperfect structures (delaminated plates and structures with fabrication imperfections).

Prof. Dr. Ionel Chirica
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Bending analysis
  • Torsion analysis
  • Failure analysis
  • Large deflexions
  • Buckling and postbuckling analysis
  • Dynamic analysis

Published Papers (2 papers)

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Research

16 pages, 4676 KiB  
Article
A Light-Powered Liquid Crystal Elastomer Spring Oscillator with Self-Shading Coatings
by Changshen Du, Quanbao Cheng, Kai Li and Yong Yu
Polymers 2022, 14(8), 1525; https://doi.org/10.3390/polym14081525 - 9 Apr 2022
Cited by 10 | Viewed by 2154
Abstract
The self-oscillating systems based on stimuli-responsive materials, without complex controllers and additional batteries, have great application prospects in the fields of intelligent machines, soft robotics, and light-powered motors. Recently, the periodic oscillation of an LCE fiber with a mass block under periodic illumination [...] Read more.
The self-oscillating systems based on stimuli-responsive materials, without complex controllers and additional batteries, have great application prospects in the fields of intelligent machines, soft robotics, and light-powered motors. Recently, the periodic oscillation of an LCE fiber with a mass block under periodic illumination was reported. This system requires periodic illumination, which limits the application of self-sustained systems. In this paper, we creatively proposed a light-powered liquid crystal elastomer (LCE) spring oscillator with self-shading coatings, which can self-oscillate continuously under steady illumination. On the basis of the well-established dynamic LCE model, the governing equation of the LCE spring oscillator is formulated, and the self-excited oscillation is studied theoretically. The numerical calculations show that the LCE spring oscillator has two motion modes, static mode and oscillation mode, and the self-oscillation arises from the coupling between the light-driven deformation and its movement. Furthermore, the contraction coefficient, damping coefficient, painting stretch, light intensity, spring constant, and gravitational acceleration all affect the self-excited oscillation of the spring oscillator, and each parameter is a critical value for triggering self-excited oscillation. This work will provide effective help in designing new optically responsive structures for engineering applications. Full article
(This article belongs to the Special Issue Behaviour Analysis of Polymeric Composite Material Structures)
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18 pages, 6602 KiB  
Article
Light-Activated Elongation/Shortening and Twisting of a Nematic Elastomer Balloon
by Lin Zhou, Yujie Wang and Kai Li
Polymers 2022, 14(6), 1249; https://doi.org/10.3390/polym14061249 - 20 Mar 2022
Cited by 1 | Viewed by 1895
Abstract
Nematic elastomer balloons with inflation-induced axial contraction and shear/torsion effect can be used as actuators for soft robots, artificial muscles, and biomedical instruments. The nematic elastomer can also generate drastic shape changes under illumination, and thus light can be utilized to activate the [...] Read more.
Nematic elastomer balloons with inflation-induced axial contraction and shear/torsion effect can be used as actuators for soft robots, artificial muscles, and biomedical instruments. The nematic elastomer can also generate drastic shape changes under illumination, and thus light can be utilized to activate the deformation of nematic elastomer balloons with huge advantages of being accurate, fast, untethered, and environmentally sustainable without chemical byproducts. To explore light-activated deformation behaviors of the balloon, a phenomenological relationship between light intensity and material parameters describing polymer backbone anisotropy is proposed from experiments, and a theoretical model of an optically-responsive nematic elastomer balloon is established based on the nematic elastomer theory. Various light-activated elongation/shortening and twisting behaviors in the cases of free-standing and axial-loading are presented and their mechanisms are elucidated. The light intensity and initial mesogen angle have great influences on the light-activated deformations including the radius, length, shearing angle and mesogen angle. Light can be easily controlled to trigger rich deformation processes, including elongation/shortening and torsion. The results of this paper are expected to promote the understanding of the light-activated deformation behaviors of the nematic elastomer balloon, and the applications in light-activated actuators and machines. Full article
(This article belongs to the Special Issue Behaviour Analysis of Polymeric Composite Material Structures)
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