Article
Engineering, Civil
Qixun Li, Xudong Zhi, Feng Fan
Summary: This study investigated the dynamic crushing behavior of a novel periodic origami-inspired cellular structure through experiments and numerical simulations. The results showed that the structure exhibited a significant negative Poisson's ratio effect and had relatively balanced mechanical properties under impact load. The gradient design was found to effectively improve the energy absorption performance of the structure.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Mechanical
Leo de Waal, Guoxing Lu, Jianjun Zhang, Zhong You
Summary: Efforts to improve cellular structures in impact scenarios through the introduction of gradients in mechanical properties have shown promise. Origami techniques offer a convenient way to transform 2D sheets into 3D structures, with the ability to vary the crease pattern for graded topology. Experimental testing validated that origami honeycomb cores can exhibit similar advantages to traditional grading methods under dynamic loading, showing potential as an attractive alternative.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Haitao Ye, Qingjiang Liu, Jianxiang Cheng, Honggeng Li, Bingcong Jian, Rong Wang, Zechu Sun, Yang Lu, Qi Ge
Summary: Conventional design methods for thick-panel origami structures are inefficient in manufacturing, hindering their adoption in structural applications. In this study, a design and manufacturing strategy is proposed to create thick-panel origami structures using a single multimaterial 3D printer. The structures are designed through a wrapping-based fabrication strategy, with rigid panels wrapped and connected by stretchable soft parts. By stacking two thick-panel origami panels, a self-locking structure is formed, capable of withstanding over 11000 times its own weight and enduring more than 100 cycles of 40% compressive strain. Through optimization, the mechanical response of the self-locking thick-panel origami structure can be programmed, leading to improved impact energy absorption for various structural applications.
NATURE COMMUNICATIONS
(2023)
Article
Mechanics
Hu Liu, Ee Teng Zhang, Bing Feng Ng
Summary: Novel graded fractal honeycombs combining functionally graded and fractal self-similarity features show significant improvements in energy absorption capacities and dynamic crushing behaviors. SG-I honeycomb demonstrates the best energy absorption behavior for low-velocity impacts, while SG-II honeycomb performs the best for specific energy absorption in high-velocity impacts.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
J. Noronha, J. Dash, M. Leary, M. Watson, M. Qian, E. Kyriakou, M. Brandt
Summary: Inspired by the efficiency of plants and animals, functionally graded lattices (FGL) utilize density gradients for diverse mechanical responses and have a wide range of applications. Additive manufacturing (AM) enables the fabrication of FGL structures with complex internal topologies.
Article
Engineering, Civil
Sihang Xiao, Qi Li, Heran Jia, Fei Wang, Jingjing Gao, Wenliang Lv, Junfeng Qi, Shengyu Duan, Panding Wang, Hongshuai Lei
Summary: This study introduces a novel graded lattice structure with tunable deformation and high energy absorption capability. The results expand the design possibilities of functionally graded lattice structures and underscore their significance in practical applications.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Mechanical
Konstantin Kappe, Klaus Hoschke, Werner Riedel, Stefan Hiermaier
Summary: This paper presents a multi-objective optimization procedure for effectively designing gradient lattice structures under dynamic loading. The aim is to maximize energy absorption characteristics and achieve a lightweight design. Through considering design variables such as the relative density and density gradient, the peak crushing force reduction and maximized specific energy absorption are simultaneously optimized. A simplified beam-based finite element model is used to efficiently model and simulate the lattice structures. An artificial neural network is trained to predict energy absorbing characteristics and find optimal lattice structure configurations. The network is trained using a multi response adaptive sampling algorithm, allowing parallel simulation with automatically generated finite element models. A multi-objective genetic algorithm is then used to find optimal combinations of design parameters for lattice structures under different impact velocities and cell topologies.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Nanoscience & Nanotechnology
Ali Saffar Shamshirgar, Rocio E. Rojas Hernandez, Girish C. Tewari, Jose Francisco Fernandez, Roman Ivanov, Maarit Karppinen, Irina Hussainova
Summary: Graphene-enhanced composites show high absorption efficiency in X-band, with significant improvement at specific ratios. By constructing a functionally graded multilayer design, the highest absorption efficiency of 99.99% was achieved, demonstrating the potential of fillers and multilayer designs for microwave absorbers.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Civil
Yuze Nian, Shui Wan, Xiao Wang, Peng Zhou, Mehmet Avcar, Mo Li
Summary: This paper proposes a novel nature-inspired functionally graded lattice filled protection structure (FGLPS) to enhance structural energy absorption characteristics under ship impact loadings. The results show that the FGLPS can significantly reduce impact force, prolong impact time, and provide effective protection.
ENGINEERING STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Hailun Zhou, Naihui He, David Z. Zhang, Miao Zhao, Tao Zhang, Xiangyu Ma
Summary: This study investigates the mechanical properties of sheet lattice structures with different rotating angles and explores their advantages in stress distribution and energy absorption. Experimental and numerical simulation results demonstrate that the structure with a graded rotation angle exhibits higher plateau stress, more stable stress variation, and the ability to alleviate local stress concentration and absorb energy effectively.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Yuze Nian, Shui Wan, Mehmet Avcar, Ru Yue, Mo Li
Summary: The study introduces a new class of bio-inspired and 3D-printed metastructures called functionally graded lattice metamaterial beams (FGLBs), which offer several benefits including high stiffness-to-weight ratio and excellent energy absorption efficiency. The mechanical properties of these structures, reinforced with AL-FRP face sheets, are examined through experimental testing and finite element simulation. The study also explores the failure characteristics, deformation mode, and energy absorption of various 3D-printed graded metamaterial beam constructions, and identifies the impact of geometrical parameters and metamaterial core graded direction on the failure process and energy absorption.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Yuze Nian, Shui Wan, Peng Zhou, Xiao Wang, Robert Santiago, Mo Li
Summary: This study evaluates the potential use of functionally graded lattice-filled composite beams and finds that they absorb more energy but yield larger crushing force compared to uniform counterparts. Various parameters have a significant impact on the crashworthiness of the structure, and multi-objective optimization results in superior Pareto solutions.
MATERIALS & DESIGN
(2021)
Article
Thermodynamics
Zihao Zheng, Yuan Yi, Xiaohui Bai, Akira Nakayama
Summary: A new design concept of Functionally Graded Structure has been proposed for efficient heat exchangers, with optimized fin height distribution achieving higher heat transfer performance. Functionally graded structures are more effective in dissipating heat to the environment compared to conventional structures.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Mechanical
Liangteng Guo, Shaoyu Zhao, Yongqiang Guo, Jie Yang, Sritawat Kitipornchai
Summary: This paper investigates the dispersion characteristics of elastic waves in functionally graded laminated phononic crystals (FGLPCs) containing auxetic metamaterials enabled by graphene origami. The material properties of FGLPCs are determined by genetic programming-assisted micromechanical models, with nonuniform distributions of graphene weight fraction and hydrogen coverage in unit cells. The dispersion relations of elastic waves are obtained using the state space approach and the method of reverberation-ray matrix. The study shows that introducing auxetic metamaterials into FGLPCs can effectively manipulate elastic waves, with graded distribution of weight fraction leading to bandgaps for both transverse and longitudinal waves.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
M. Kalantari, N. Khaji
Summary: This paper presents a theoretical formulation for lateral translation and impedance function of a rigid foundation in a transversely isotropic functionally graded half-space. The study considers the linear elastic medium with exponentially varying elastic constants along depth to account for the effect of elastic non-homogeneities. The relax treatment of mixed boundary value problem is formulated using the transformed kernels of Green's functions, resulting in a Fredholm integral equation. The results demonstrate the impact and treatment of frequency and material anisotropy on the medium.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Mechanical
Jiayao Ma, Xiaoyi Jiang, Yan Chen
Summary: This paper proposes an innovative 3D modular bistable meta-structure based on two different types of mechanisms with partially compatible motion ranges, allowing for fine-tuning of stiffness transition by adjusting geometric parameters and hinge stiffness to achieve a stable state for the meta-structure.
EXTREME MECHANICS LETTERS
(2022)
Article
Engineering, Mechanical
Fufu Yang, Miao Zhang, Jiayao Ma, Zhong You, Ying Yu, Yan Chen, Glaucio H. Paulino
Summary: Resch patterns are tessellation origami patterns consisting of more than one type of polygons. They are generally rigid foldable but have a large number of degrees of freedom. In order to achieve one-DOF forms of triangular Resch pattern units, the thick-panel technique is employed to replace spherical linkages with spatial linkages. The compatibility among all the vertices is studied by kinematic analysis, and two design schemes are obtained to form a one-DOF origami structure.
MECHANISM AND MACHINE THEORY
(2022)
Article
Multidisciplinary Sciences
Xiao Zhang, Jiayao Ma, Mengyue Li, Zhong You, Xiaoyan Wang, Yu Luo, Kaixue Ma, Yan Chen
Summary: Multistability plays a crucial role in advanced engineering applications, but current designs mostly rely on combinations of bistable unit cells in 2D/3D, lacking a universal multistable unit cell. This study introduces a tristable kirigami cuboid that integrates elastic sheets and switchable hinge axes to create elastic joints effective in specific motion ranges. The energy barriers between stable states can be programmed through geometric design parameters and material properties of the elastic joints. By using the tristable cuboids as unit cells, a family of metastructures with multiple stable states can be constructed. This versatile multistability and structural diversity enable the development of multifunctional materials and devices, as demonstrated in the design of a frequency reconfigurable antenna.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Jinrui Yu, Jiayao Ma
Summary: This research focuses on the design of a shear morphing wing skin that can expand the shear morphing capability of aircraft wings. By using an angled module that utilizes the tensile stress generated during shear, the skin can withstand large shear deformation without wrinkling. Experimental results showed a 53% larger deformation range compared to existing designs. Parametric analysis and a theoretical model were also conducted to understand the wrinkle prevention mechanism and estimate the critical wrinkling angle of the skin.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Kailun Huang, Jiayao Ma, Xiang Zhou, Hai Wang
Summary: This article presents a systematic study on the mechanical properties of 3D-printed metallic origami cellular metamaterials (OCMs) based on various origami configurations. The OCM specimens were fabricated using metallic 3D printing method, and compression tests were carried out to obtain their mechanical responses. The relationship between key design parameters and mechanical performance was revealed. Finite element modeling and parametric studies were conducted to further analyze the compressive behaviors of different OCM models. This work provides a practical guide for the design and fabrication of 3D-printed metallic OCMs.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Ying Yu, Yan Chen, Glaucio Paulino
Summary: This research explores the manipulation of folding angles in Resch patterns to achieve different surfaces, and investigates the impact of damping factor, crease stiffness, and neutral angle on the unfolding process. By changing the neutral angle and applying constraints, stable unfolding surfaces with various curvatures can be created.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Weilin Lv, Yan Chen, Jianjun Zhang
Summary: In this paper, a method for constructing thick-panel foldable tubes is introduced by partially replacing spherical linkages with spatial linkages. The method allows for the reproduction of kinematic motions equivalent to those realized using zero-thickness origami. The approach simplifies the manufacturing process of tubular structures and is applicable to designs that cannot disregard thickness.
JOURNAL OF MECHANISMS AND ROBOTICS-TRANSACTIONS OF THE ASME
(2023)
Article
Physics, Applied
Hongyi Ouyang, Yuanqing Gu, Zhibin Gao, Lei Hu, Zhen Zhang, Jie Ren, Baowen Li, Jun Sun, Yan Chen, Xiangdong Ding
Summary: In this study, nitrogen-doped porous graphene metamaterials on the nanoscale are designed using a topological kirigami assembly, with a thermal-switching ratio of 27.79, which is more than double the value of previous work. The excellent performance is attributed to the chiral folding-unfolding deformation, resulting in a metal-insulator transition. This research provides a nanomaterial design paradigm that bridges the gap between kinematics and functional metamaterials, motivating the development of high-performance thermal regulators.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Civil
Dian Zhang, A. K. Qin, Yan Chen, Guoxing Lu
Summary: Origami-inspired metamaterials have unlimited possibilities and broad applications in science and engineering. Machine learning approaches can accurately predict the mechanical behaviors of non-rigid origami structures, providing strong support for their applications.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Yuehao Zhang, Ming Li, Yan Chen, Rui Peng, Xiao Zhang
Summary: This paper proposes a novel parabolic cylindrical antenna with great folding efficiency by utilizing origami patterns and selective removal of material. Design rules for transforming the parabolic equation to the origami patterns are defined. Specific connectors are designed between the origami patterns to ensure a one degree of freedom deployable structure. Joint-removing techniques are introduced to achieve a continuous and smooth parabolic cylindrical surface.
MECHANISM AND MACHINE THEORY
(2023)
Article
Engineering, Mechanical
Yuanqing Gu, Yan Chen
Summary: This paper presents a synthesis method for constructing a group of origami polyhedrons with synchronized radial motion and deployable transformability. By integrating a spatial 9R linkage and three pairs of spherical 4R linkages, an origami-synchronized mechanism with a threefold-symmetric motion feature is proposed. Three one-DOF transformable polyhedral mechanisms with distinct symmetries are constructed by embedding the proposed mechanism cells into the surface of Archimedean polyhedrons, and their kinematic properties are verified through fabricated prototypes. The dimensional shortening operations are applied to demonstrate structural variations and achieve various polyhedral transformations with different volumetric deployable ratios.
MECHANISM AND MACHINE THEORY
(2023)
Article
Multidisciplinary Sciences
Zhou Hu, Zhibo Wei, Kun Wang, Yan Chen, Rui Zhu, Guoliang Huang, Gengkai Hu
Summary: In the field of flexible metamaterial design, harnessing zero modes is crucial for reconfigurable elastic properties. However, lacking systematic designs on the corresponding zero modes leads to quantitative enhancement rather than qualitative transformation of the metamaterials. Here, the authors propose a 3D metamaterial with engineered zero modes and demonstrate its transformable static and dynamic properties, covering seven extremal metamaterial types.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Zhibo Wei, Zhou Hu, Rui Zhu, Yan Chen, Gengkai Hu
Summary: This paper proposes a novel design for a three-dimensional pentamode metamaterial, which can exhibit both anisotropic and isotropic properties by changing its geometry. Experimental results demonstrate that this pentamode metamaterial can manipulate the amplitude and wavefront of acoustic waves, providing a wider platform for tunable control of acoustic waves in fluids.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Yunfang Yang, Xiao Zhang, Perla Maiolino, Yan Chen, Zhong You
Summary: This study proposes a novel approach to constructing metamaterials based on the kinematics of linkages, where a modular mechanism is tessellated to create a material with constant negative Poisson's ratios and a clearly defined deformation path.
MATERIALS & DESIGN
(2023)
Article
Engineering, Mechanical
Rosaria Del Toro, Maria Laura De Bellis, Marcello Vasta, Andrea Bacigalupo
Summary: This article presents a multifield asymptotic homogenization scheme for analyzing Bloch wave propagation in non-standard thermoelastic periodic materials. The proposed method derives microscale field equations, solves recursive differential problems within the unit cell, establishes a down-scaling relation, and obtains average field equations. The effectiveness of this approach is validated by comparing dispersion curves with those from the Floquet-Bloch theory.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Matthias Ryser, Jason Steffen, Bekim Berisha, Markus Bambach
Summary: This study investigates the feasibility of replacing complex experiments with multiple simpler ones to determine the anisotropic yielding behavior of sheet metal. The results show that parameter identifiability and accuracy can be achieved by combining multiple specimen geometries and orientations, enhancing the understanding of the yield behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Wenjun Li, Pengfei Zhang, Siyong Yang, Shenling Cai, Kai Feng
Summary: This study presents a novel two-dimensional non-contact platform based on Near-field Acoustic Levitation (NFAL), which can realize both one-dimensional and two-dimensional transportation. Numerical and experimental results prove the feasibility and ease of this method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Shuo Liu, Lu Che, Guodong Fang, Jun Liang
Summary: This study presents a novel lamina conjugated bond-based peridynamic (BB-PD) model that overcomes the limitations of material properties and is applicable to composite laminates with different stacking sequences. The accuracy and applicability of the model are validated through simulations of elastic deformation and progressive damage behavior, providing an explanation of the damage modes and failure mechanisms of laminated composite materials subjected to uniaxial loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Omar El-Khatib, S. Kumar, Wesley J. Cantwell, Andreas Schiffer
Summary: Sandwich-structured honeycombs (SSHCs) are hierarchical structures with enhanced mass-specific properties. A model capable of predicting the elastic properties of hexagonal SSHCs is presented, showing superior in-plane elastic and shear moduli compared to traditional honeycombs, while the out-of-plane shear moduli are reduced.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Zhi-Jian Li, Hong-Liang Dai, Yuan Yao, Jing-Ling Liu
Summary: This paper proposes a process-performance prediction model for estimating the yield strength and ultimate tensile strength of metallic parts fabricated by powder bed fusion additive manufacturing. The effect of main process variables on the mechanical performance of printed metallic parts is analyzed and the results can serve as a guideline for improvement. The accuracy of the proposed model is validated by comparison with literature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Saman A. Bapir, Kawa M. A. Manmi, Rostam K. Saeed, Abdolrahman Dadvand
Summary: This study numerically investigates the behavior of an ultrasonically driven gas bubble between two parallel rigid circular walls with a cylindrical micro-indentation in one wall. The primary objective is to determine the conditions that facilitate the removal of particulate contamination from the indentation using the bubble jet. The study found that the bubble jet can effectively remove contamination from the indentation for certain ranges of indentation diameter, but becomes less effective for larger indentation diameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)