Article
Chemistry, Physical
Farrukh Mustahsan, Sohaib Z. Khan, Asad A. Zaidi, Yaser H. Alahmadi, Essam R. Mahmoud, Hamad Almohamadi
Summary: This paper presents a modified re-entrant honeycomb auxetic structure and verifies its performance through analytical modeling, finite element analysis, and tensile testing. The results show that the newly added strut has a significant effect on the directional properties of the structure, and the structure exhibits high Young's modulus and negative Poisson's ratio in both loading directions, especially at low relative density.
Article
Engineering, Aerospace
Yu Chen, Zhi-Wei Wang
Summary: This study proposed an improved hexagonal honeycomb structure by replacing the solid junction with a small hollow circle, resulting in a novel honeycomb. Theoretical models based on energy approach were developed to predict the elastic properties of the new honeycomb, and finite element analysis was used to verify the models and investigate the effects of micro geometrical parameters. The results showed that the new honeycomb exhibited a negative Poisson's ratio effect, higher specific Young's modulus and shear modulus compared to the common hexagonal honeycomb. It also demonstrated a more tailored anisotropy. Therefore, the new honeycomb could be an effective substitute for the common hexagonal honeycomb and provide guidance for improved design of auxetic honeycombs.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Pengju Li, Xilin Zhang, Zhengkai Zhang, Qingguo Wen
Summary: A new force measurement method based on the auxetic structure is proposed in this paper, using a light source, auxetic structure, and solar cell. The method avoids contact between components, and experimental results show improved sensitivity and linearity over traditional methods.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Mechanical
Feng Jiang, Shu Yang, Yu Zhang, Chang Qi, Shang Chen
Summary: In this study, a novel graded re-entrant circular auxetic honeycomb structure was proposed and fabricated using a low-cost method. The crushing behaviors of different designs of the honeycomb structure were investigated, and the results showed that the gradient design can control the deformation modes and improve the energy absorption capacity. Under dynamic impacts, the honeycomb structure with a negative gradient design exhibited better performance and negative Poisson's ratio behavior. This study provides new insights for the fabrication and design of auxetic metamaterials.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Civil
Mingming Chen, Rongchang Zhong, Yunzhou Wang, Hao Wu, Minghui Fu
Summary: In this paper, a honeycomb structure with enhanced anisotropy in the orthogonal direction is proposed, utilizing a re-entrant chiral hybrid deformation mechanism. Analytical formulas for the equivalent Poisson's ratio and normalized Young's modulus are derived and validated through experiments and finite element simulations. Parameter analysis demonstrates the extreme anisotropy of this structure, allowing it to be designed into a stable tubular stent for biomedical applications.
ENGINEERING STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Yang Zhou, Yi Pan, Lin Chen, Qiang Gao, Beibei Sun
Summary: A novel auxetic honeycomb structure named re-entrant combined-wall (RCW) honeycomb is developed in this study by introducing hierarchical substructures to enhance its performance. Experimental results show that the RCW honeycomb exhibits high orthogonality, tunability, and increased crushing strength under large deformation.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Engineering, Civil
Feng Jiang, Shu Yang, Chang Qi, Hai-Tao Liu
Summary: In this study, the two plateau characteristics of re-entrant honeycomb (REH) with negative Poisson's ratio (NPR) in the concave direction were investigated through experimental, numerical, and theoretical methods. The results showed that due to the transitional rectangle structures formed during crushing, the REH specimens exhibited a two-step deformation mode and two plateau stresses in the stress-strain curves. Both numerical and theoretical predictions agreed well with the experimental results. Parameter analysis indicated that different geometric parameters influenced the plateau stresses, and the crushing velocity also affected the characteristics of the honeycomb structure.
THIN-WALLED STRUCTURES
(2022)
Article
Physics, Condensed Matter
Sai Bao, Xin Ren, Yu Jun Qi, Hao Ran Li, Dong Han, Wei Li, Chen Luo, Zhong Zheng Song
Summary: This paper investigates a modified auxetic re-entrant honeycomb structure that enhances the energy absorption capacity by adding curved ribs to the conventional re-entrant honeycomb structure. The in-plane quasi-static compression response of the structure under large deformation is explored numerically, and the validity of the numerical simulation is verified through quasi-static compression tests. The results from both experiments and simulations show the occurrence of two plateau stresses in the load-displacement curves of the structure during the quasi-static compression process, with the second plateau stress being significantly higher than the first one. The occurrence time of the second plateau stress can be controlled by adjusting the distance between the concave curved ribs in the structure. The findings suggest that the modified auxetic re-entrant honeycomb structures have great potential for various applications in civil engineering, vehicle crashworthiness, and protective infrastructure.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Engineering, Civil
Chang Qi, Lian-Zheng Pei, Alex Remennikov, Shu Yang, Feng Jiang
Summary: This paper theoretically studies the crushing response of metallic 3D re-entrant honeycomb structures and analyzes their crushing strength. The results reveal that the oblique wall length and cell wall thickness have a significant effect on the crushing strength, while other parameters have a minor effect. Additionally, a new type of 3D re-entrant honeycomb unit structure is discovered and its crushing strength is derived and validated.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Physical
Jinming Lian, Zhenqing Wang
Summary: This study investigates the crushing behavior of a new honeycomb structure and discusses the effects of different gradient parameters on deformation mode and extrusion response. The results show that the influence of these parameters varies for in-plane and out-of-plane crushing of the honeycomb.
Article
Mechanics
Liang Wang, Hai-Tao Liu
Summary: This work presents a parameter optimization method using Python script to meet the urgent need for lightweight honeycomb metamaterial. Results show that the combination of Python script programming model and genetic algorithm optimization method can achieve optimal solutions for honeycomb metamaterial. The optimized parameters demonstrate an admirable auxetic effect in the 3D honeycomb, providing strong evidence for the continuous application of optimization algorithms in improving mechanical properties.
COMPOSITE STRUCTURES
(2021)
Article
Instruments & Instrumentation
Amer Alomarah, Zahraa A. Al-Ibraheemi, Dong Ruan
Summary: This study proposes an auxetic stent called RCA, which has controllable auxetic features by adjusting geometric parameters and the number of unit cells. The experimental and numerical results show that the RCA stents have remarkable radial expansion capabilities and exhibit different deformation patterns.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Aerospace
Sicong Zhou, Hua Liu, Jingxuan Ma, Xianfeng Yang, Jialing Yang
Summary: This study proposes a novel 3D hollow re-entrant auxetic (HRA) lattice metamaterial to enhance energy absorption capacity. The mechanical properties and energy absorption behaviors of the HRA lattice are investigated using an analytical model and finite element method. Compared with the solid re-entrant auxetic (SRA) lattice, the HRA lattice shows an improved specific energy absorption of up to 27.43%. The design parameters of the HRA lattice can be tuned to meet different energy absorption demands.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Civil
Sheng Yu, Zhikang Liu, Xiaoming Cao, Jiayi Liu, Wei Huang, Yangwei Wang
Summary: This paper investigates the compressive performance and failure behavior of composite auxetic re-entrant honeycomb sandwich structure. Different gradient configurations of auxetic re-entrant honeycomb structures were manufactured and tested. The compressive responses and deformation mechanisms were analyzed based on stress-strain curves and deformation processes. The Poisson's ratio, energy efficiency, and plateau stress were defined and used to study the auxetic performance and energy absorption ability. A high-fidelity numerical model was established to analyze the compressive performances and failure behaviors, and the results agreed well with experimental results.
THIN-WALLED STRUCTURES
(2023)
Article
Instruments & Instrumentation
Tatheer Zahra
Summary: A study on 3D printing of auxetic materials revealed that specimens with the smallest cell sizes exhibited the highest resistance against compression, tension, and out-of-plane loading, as well as higher elastic modulus and negative Poisson's ratio. Larger cell geometries showed higher deformability and energy absorption characteristics, while all designed geometries exhibited similar deformability in out-of-plane bending, with smaller cells demonstrating the maximum ductility.
SMART MATERIALS AND STRUCTURES
(2021)
Review
Engineering, Mechanical
R. Dubey, R. Jayaganthan, D. Ruan, N. K. Gupta, N. Jones, R. Velmurugan
Summary: This document reviews recent research on the mechanical properties of 6xxx series aluminium alloys and the crashworthiness of tubes made of these alloys. The review focuses on the material response at high strain rates and the structural response under quasi-static and dynamic loadings. It also discusses the effects of processing routes and heat treatments on the dynamic behavior of the alloys, as well as the correlation between material response and microstructural features.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Review
Engineering, Mechanical
R. Dubey, R. Jayaganthan, D. Ruan, N. K. Gupta, N. Jones, R. Velmurugan
Summary: This study evaluates the mechanical response of 6xxx series aluminium alloys under dynamic loads, focusing on the ballistic behavior and failure mechanisms at different temperatures. It also reviews analytical and numerical models, as well as empirical equations proposed in previous works. Further investigation is needed to validate the applicability of these equations.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Engineering, Mechanical
Zhipeng Gao, Hai Zhang, Jian Zhao, Dong Ruan
Summary: This paper investigates the enhanced crushing performance of bio-inspired hierarchical multi-cell hexagonal tubes (BHMH) through numerical analysis and theoretical prediction, showing improved peak crushing force and energy absorption compared to traditional hexagonal tubes.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Zhipeng Gao, Dong Ruan, Hai Zhang, Jian Zhao, Zhanyuan Gao, Zhixin Huang
Summary: This paper conducts a systematic finite element analysis study to evaluate the effects of two main simulation techniques on the deformation modes and force-displacement curves of thin-walled tubes. By carrying out axial compressive tests on three types of thin-walled circular tubes with different geometrical parameters, and developing finite element models, the influences of indentation triggers and buckling modes are explored. The study finds that a suitable simulation technique can accurately mimic the deformation mode and corresponding force-displacement curve for thin-walled circular tubes.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2023)
Article
Engineering, Civil
Hai Zhang, Zhipeng Gao, Dong Ruan
Summary: The mechanical performance of square tubes with in-plane graded wall thickness under oblique compression has been investigated for the first time in this study. Experimental results show that both single-surface graded wall thickness (SSG) and double-surface graded wall thickness (DSG) tubes display better specific energy absorption than tubes with uniform thickness under oblique compression.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Riyan Rashid, Syed Masood, Dong Ruan, Suresh Palanisamy, Xiaodong Huang, Rizwan Abdul Rahman Rashid
Summary: The laser powder bed fusion (LPBF) method, also known as selective laser melting (SLM), is widely used in metal additive manufacturing (AM). In this study, the design optimization and validation of LPBF-printed AlSi12 metal parts were investigated. Different topologically optimized lattice beams were compared, and it was found that the 1 x 1 lattice beam performed the best in bending tests. The mechanical behavior of these beams was influenced by the design elements and a new material model or simulation technique is needed to overcome this issue.
Article
Engineering, Civil
Chamini Rodrigo, Shanqing Xu, Yvonne Durandet, Darren Fraser, Dong Ruan
Summary: This paper experimentally investigated the quasi-static and dynamic compressive behaviors of functionally graded (FG) lattices made of stainless steel (SS 316L) by electron beam melting (EBM). The results showed that the bi-directional density graded lattices witnessed the highest plateau stress and energy absorption capacity. Finite element modelling further studied the deformation pattern and stress distribution, showing that the enhanced strength and energy absorption were related to the periodic collapse of graded structures corresponding to the density gradient strategy. Parametric studies were conducted to examine the influence of density gradient on the dynamic response of FG lattices using the experimentally validated FEM models.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Zhipeng Gao, Hai Zhang, Jian Zhao, Ying Zhang, Dong Ruan
Summary: In this study, thin-walled aluminum square tubes with different wall thickness configurations were experimentally compressed at various loading angles. Numerical analysis was also conducted to investigate the effects of wall thickness, thickness configuration, and loading angle on the deformation mode and energy absorption of the tubes. The results showed that tubes with opposite walls of different thicknesses exhibited better energy absorption performance under oblique loading, while tubes with opposite walls of the same thickness absorbed the most energy at larger angles.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Analytical
Haoran Mu, Daniel Smith, Tomas Katkus, Darius Gailevicius, Mangirdas Malinauskas, Yoshiaki Nishijima, Paul R. Stoddart, Dong Ruan, Meguya Ryu, Junko Morikawa, Taras Vasiliev, Valeri Lozovski, Daniel Moraru, Soon Hock Ng, Saulius Juodkazis
Summary: Microlens arrays (MLAs) were fabricated using a femtosecond direct laser write (fs-DLW) technique, allowing high-fidelity definition of 3D surfaces on IR transparent substrates. A graphene oxide (GO) grating acting as a linear polariser was also fabricated by fs-DLW. The MLAs and GO polarisers were characterised and their performance was simulated through numerical modelling with good agreement between experimental results and simulations.
Article
Materials Science, Multidisciplinary
Chamini Rodrigo, Shanqing Xu, Yvonne Durandet, Darren Fraser, Dong Ruan
Summary: This study investigates the flexural behavior of different types of lattice beams and finds that bidirectional lattice beams have higher flexural stiffness and strength compared to uniform and unidirectional lattice beams. The lower strength of unidirectional lattice beams is attributed to the easier collapse of thinner lattice layers on the impact side. Furthermore, the parametric study reveals that the flexural stress and specific energy absorption capacity of bidirectional lattice beams can be enhanced by manipulating the layer density gradient.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Bing Leng, Dong Ruan, Shanqing Xu, Kwong Ming Tse
Summary: This study explores the feasibility of using a structure inspired by horsetail and human spine features as a potential helmet liner to mitigate acceleration-induced injuries. Experimental and numerical evaluations were conducted to assess the compressive and shear performance of the new horsetail liner structure, as well as the material characteristics of expanded polystyrene foam and thermoplastic polyurethane. A parametric study was also conducted to determine the optimal design configuration of the horsetail liner structure. The results demonstrate that the bioinspired horsetail structure is effective in reducing both linear and rotational accelerations.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Instruments & Instrumentation
Amer Alomarah, Zahraa A. Al-Ibraheemi, Dong Ruan
Summary: This study proposes an auxetic stent called RCA, which has controllable auxetic features by adjusting geometric parameters and the number of unit cells. The experimental and numerical results show that the RCA stents have remarkable radial expansion capabilities and exhibit different deformation patterns.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Amer Alomarah, Ye Yuan, Dong Ruan
Summary: This study aims to develop an auxetic metamaterial with a relatively uniform deformation pattern and superior energy absorption capability. A novel butterfly-shaped auxetic metamaterial (BSAM) was developed and experimentally and numerically investigated. The mechanical and energy absorption performance of BSAM surpassed that of other popular auxetic honeycombs, and its geometric configurations provided the possibility to design bio-inspired metamaterial for specific applications.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Chamini Rodrigo, Shanqing Xu, Yvonne Durandet, Phuong Tran, Dong Ruan
Summary: This paper investigates the quasi-static compressive behavior of functionally graded lattices made of polyamide PA11 by multi jet fusion (MJF). The experimental results show that topology grading plays a dominant role in tuning the deformation patterns, stress-strain curves, and the energy absorption capacity of the lattice structures. Based on numerical simulations, a semi-empirical formula is developed to predict the plateau stress of the studied FG lattices.
THIN-WALLED STRUCTURES
(2023)
