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Applied Sciences
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Structural Dynamics and Protective Materials
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Structural Dynamics and Protective Materials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: 20 March 2025 | Viewed by 1368

Special Issue Editors

Dr. Hasan Al-Rifaie

E-Mail Website
Guest Editor
Institute of Structural Engineering, Poznan University of Technology, 60-965 Poznan, Poland
Interests: structural dynamics; cellular metamaterials; damping systems; protective design
Dr. Tomasz Jankowiak

E-Mail Website
Guest Editor
Institute of Structural Engineering, Poznan University of Technology, 60-965 Poznan, Poland
Interests: computational mechanics; finite element method; composites; advanced materials; structural dynamics
Prof. Dr. Wojciech Sumelka

E-Mail Website
Guest Editor
Institute of Structural Engineering, Poznan University of Technology, 60-965 Poznan, Poland
Interests: nonlinear analysis; material modeling; extreme loading; constitutive modelling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Structural dynamics require specific considerations and design strategies to minimise potential damage and protect occupants. Researchers have been working on developing structures and materials that can withstand extreme dynamic loading conditions. Protective structures and materials can be used in a wide range of applications, including (but not limited to) civil structures, aerospace, automotives, and defence. The aim of this Special Issue is to publish scientific papers and reviews related to the analysis, design, and testing of state-of-the-art, cost-effective protective materials and structures. This includes (but is not limited to) cellular materials, damping systems, blast-resistant structures, and protective coatings.

Dr. Hasan Al-Rifaie
Dr. Tomasz Jankowiak
Prof. Dr. Wojciech Sumelka
Guest Editors

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. Applied Sciences 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 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

  • impact dynamics
  • protective materials
  • cellular metamaterials
  • sandwich panels
  • shock absorbers
  • numerical modelling
  • experimental testing

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Published Papers (2 papers)

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Research

29 pages, 9575 KiB  
Article
Design and Multi-Objective Optimization of Auxetic Sandwich Panels for Blastworthy Structures Using Machine Learning Method
by Andika, Sigit Puji Santosa, Djarot Widagdo and Arief Nur Pratomo
Appl. Sci. 2024, 14(23), 10831; https://doi.org/10.3390/app142310831 - 22 Nov 2024
Abstract
The design and multi-objective optimization of auxetic sandwich panels (ASPs) are performed to enhance the blastworthiness of armored fighting vehicles (AFVs). Various metastructures in the form of four auxetic geometries are proposed as the sandwich core: re-entrant honeycomb (REH), double-arrow honeycomb (DAH), star [...] Read more.
The design and multi-objective optimization of auxetic sandwich panels (ASPs) are performed to enhance the blastworthiness of armored fighting vehicles (AFVs). Various metastructures in the form of four auxetic geometries are proposed as the sandwich core: re-entrant honeycomb (REH), double-arrow honeycomb (DAH), star honeycomb (SH), and tetra-chiral honeycomb (CH). This paper employs a combination of finite element and machine learning methodologies to evaluate blastworthiness performance. Optimization is carried out using the nondominated sorting genetic algorithm II (NSGA-II) method. The optimization results show significant improvements in blastworthiness performance, with notable reductions in permanent displacement and enhancements in specific energy absorption (SEA). Global sensitivity analysis using SHapley Additive exPlanations (SHAP) reveals that cell thickness is the most critical factor affecting blastworthiness performance, followed by the number of cells and corner angle or radius for CH. The application of optimized ASP on AFVs shows promising results, with no failure occurring in the occupant floor. Furthermore, AFVs equipped with the optimized ASP DAH significantly reduce maximum displacement and acceleration by 39.00% and 43.56%, respectively, and enhance SEA by 48.30% compared to optimized aluminum foam sandwich panels. This study concludes that ASPs have potential applications in broader engineering fields. Full article
(This article belongs to the Special Issue Structural Dynamics and Protective Materials)
14 pages, 13957 KiB  
Article
Improving the Impact Resistance of Anti-Ram Bollards Using Auxetic and Honeycomb Cellular Cores
by Hasan Al-Rifaie and Ahmed Hassan
Appl. Sci. 2024, 14(19), 8898; https://doi.org/10.3390/app14198898 - 2 Oct 2024
Viewed by 993
Abstract
Security is a crucial matter, and when it comes to road safety, barriers are increasingly needed to protect assets and pedestrians from intentional and accidental vehicular impacts. Hollow steel tubes are commonly used to produce bollards; however, their impact resistance and energy absorption [...] Read more.
Security is a crucial matter, and when it comes to road safety, barriers are increasingly needed to protect assets and pedestrians from intentional and accidental vehicular impacts. Hollow steel tubes are commonly used to produce bollards; however, their impact resistance and energy absorption are limited. Hence, the aim of this study is to investigate whether the addition of honeycomb and auxetic cellular cores can improve the energy absorption and protection level of existing bollards. Hollow bollard, a honeycomb–core bollard and an auxetic-core bollard were numerically modeled and tested (using Simulia Abaqus software, version 2019) against the impact of M1-class vehicles (of 1500 kg mass) at five different speeds (following PAS 68:2013 British standard). Hence, 15 cases/numerical models were considered, with 5 cases for each bollard type. The results revealed that the addition of an auxetic cellular core to the bollard system could increase its energy dissipation by 52% compared to the hollow steel bollard. Moreover, the proposed auxetic anti-ram bollard system was capable of stopping an M1-class vehicular impact of 64 km/h compared to only 32 km/h when using a hollow steel bollard. To the authors’ knowledge, the use of an auxetic core, explicitly for anti-ram bollards, can be considered the novel part of this research. Full article
(This article belongs to the Special Issue Structural Dynamics and Protective Materials)
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