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Symmetry
Special Issues
Topology Optimization of Aerospace Materials and Structures
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Topology Optimization of Aerospace Materials and Structures

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Computer".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 7112

Special Issue Editor

Prof. Dr. Yangjun Luo

E-Mail Website
Guest Editor
School of Aeronautics and Astronautics, Dalian University of Technology, Dalian, China
Interests: topology optimization; metamaterial design; reliability-based optimization

Special Issue Information

Dear Colleagues, 

Topology optimization is an effective mathematical method that optimizes material layout within a given design space, for a given set of loads, boundary conditions and constraints with the goal of maximizing the performance of the structure system. Several gradient-based and gradient-free topology optimization techniques have been developed during the past several decades. Recently, this technique has experienced a surge in interest as a tool for novel design in aeronautics and aerospace engineering problems. However, due to the intricacy and high-performance requirements, the topology optimization theoretical framework of aerospace structures is far from being complete and many challenging problems are still open. Therefore, the purpose of this issue is to survey recent advances in topology optimization techniques applied in aerospace materials and structures. The topics include novel topology optimization algorithms and new applications linking aerospace material and structure design considering uncertainties, multi-physical coupling, large-scale, extreme performance, smart materials, complex nonlinearity, etc.

Please note that all submitted papers must be within the general scope of the Symmetry journal.

Prof. Dr. Yangjun Luo
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. Symmetry is an international peer-reviewed open access monthly 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 2400 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

  • topology optimization
  • material microstructure design
  • multi-physical field
  • concurrent design
  • reliability-based topology optimization

Published Papers (3 papers)

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Research

17 pages, 62222 KiB  
Article
Optimal Designs of Phononic Crystal Microstructures Considering Point and Line Defects
by Jingjie He, Jiamei Sun, Juncheng Fan, Zhiyuan Jia and Xiaopeng Zhang
Symmetry 2021, 13(11), 1993; https://0-doi-org.brum.beds.ac.uk/10.3390/sym13111993 - 21 Oct 2021
Cited by 2 | Viewed by 1421
Abstract
In this paper, a two-stage optimization strategy for designing defective unit cells of phononic crystal (PnC) to explore the localization and waveguide states for target frequencies is proposed. In the optimization model, the PnC microstructures are parametrically described by a series of hyperelliptic [...] Read more.
In this paper, a two-stage optimization strategy for designing defective unit cells of phononic crystal (PnC) to explore the localization and waveguide states for target frequencies is proposed. In the optimization model, the PnC microstructures are parametrically described by a series of hyperelliptic curves, and the optimal designs can be obtained by systematically changing the designable parameters of hyperellipse. The optimization contains two individual processes. We obtain the configurations of a perfect unit cell for different orders of band gap maximization. Subsequently, by taking advantage of the supercell technique, the defective unit cells are designed based on the unit cell configuration for different orders of band gap maximization. The finite element models show the localization and waveguide phenomenon for target frequencies and validate the effectiveness of the optimal designs numerically. Full article
(This article belongs to the Special Issue Topology Optimization of Aerospace Materials and Structures)
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22 pages, 2755 KiB  
Article
Comparative Study of Peridynamics and Finite Element Method for Practical Modeling of Cracks in Topology Optimization
by Peyman Lahe Motlagh and Adnan Kefal
Symmetry 2021, 13(8), 1407; https://0-doi-org.brum.beds.ac.uk/10.3390/sym13081407 - 02 Aug 2021
Cited by 9 | Viewed by 2591
Abstract
Recently, topology optimization of structures with cracks becomes an important topic for avoiding manufacturing defects at the design stage. This paper presents a comprehensive comparative study of peridynamics-based topology optimization method (PD-TO) and classical finite element topology optimization approach (FEM-TO) for designing lightweight [...] Read more.
Recently, topology optimization of structures with cracks becomes an important topic for avoiding manufacturing defects at the design stage. This paper presents a comprehensive comparative study of peridynamics-based topology optimization method (PD-TO) and classical finite element topology optimization approach (FEM-TO) for designing lightweight structures with/without cracks. Peridynamics (PD) is a robust and accurate non-local theory that can overcome various difficulties of classical continuum mechanics for dealing with crack modeling and its propagation analysis. To implement the PD-TO in this study, bond-based approach is coupled with optimality criteria method. This methodology is applicable to topology optimization of structures with any symmetric/asymmetric distribution of cracks under general boundary conditions. For comparison, optimality criteria approach is also employed in the FEM-TO process, and then topology optimization of four different structures with/without cracks are investigated. After that, strain energy and displacement results are compared between PD-TO and FEM-TO methods. For design domain without cracks, it is observed that PD and FEM algorithms provide very close optimum topologies with a negligibly small percent difference in the results. After this validation step, each case study is solved by integrating the cracks in the design domain as well. According to the simulation results, PD-TO always provides a lower strain energy than FEM-TO for optimum topology of cracked structures. In addition, the PD-TO methodology ensures a better design of stiffer supports in the areas of cracks as compared to FEM-TO. Furthermore, in the final case study, an intended crack with a symmetrically designed size and location is embedded in the design domain to minimize the strain energy of optimum topology through PD-TO analysis. It is demonstrated that hot-spot strain/stress regions of the pristine structure are the most effective areas to locate the designed cracks for effective redistribution of strain/stress during topology optimization. Full article
(This article belongs to the Special Issue Topology Optimization of Aerospace Materials and Structures)
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16 pages, 4888 KiB  
Article
Temperature Distribution Design Based on Variable Lattice Density Optimization and Metal Additive Manufacturing
by Akira Ueno, Honghu Guo, Akihiro Takezawa, Ryota Moritoyo and Mitsuru Kitamura
Symmetry 2021, 13(7), 1194; https://0-doi-org.brum.beds.ac.uk/10.3390/sym13071194 - 02 Jul 2021
Cited by 7 | Viewed by 2003
Abstract
Additive manufacturing (AM) is employed for fabricating industrial products with complex geometries. As topological optimization is suitable for designing complex geometries, studies have combined AM and topological optimization, evaluating the density optimization of lattice structures as a variant of topological optimization. The lattice [...] Read more.
Additive manufacturing (AM) is employed for fabricating industrial products with complex geometries. As topological optimization is suitable for designing complex geometries, studies have combined AM and topological optimization, evaluating the density optimization of lattice structures as a variant of topological optimization. The lattice structures of components fabricated via AM comprise voids. Models designed using topological optimization should be modified to ensure structures suitable for AM. As the lattice unit can be easily fabricated using AM with fewer design modifications, this study uses lattice density optimization for an industrial AM product. We propose a method of optimizing the lattice distribution for controlling the surface temperature uniformity of industrial products, such as molds. The effective thermal conductivity of the lattice is calculated using the homogenization and finite element methods. The effective thermal conductivity changes depending on the internal pore sizes. The proposed methodology is validated using a 3D example; the minimization problem of surface temperature variations in the target domain is considered. The variable density of the embedded lattice in the target domain is optimized, and we experimentally validated the performance of the lattice unit cell and optimal 3D structure using metal powder bed fusion AM. Full article
(This article belongs to the Special Issue Topology Optimization of Aerospace Materials and Structures)
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