Article
Chemistry, Physical
Adrien Pyskir, Manuel Collet, Zoran Dimitrijevic, Claude-Henri Lamarque
Summary: This paper presents a numerical and experimental study on a locally resonant auxetic metamaterial for vibration isolation, combining different mechanisms such as buckling, local resonances, and auxetism to enhance isolation properties. The study found huge bandgaps for the resonant case and confirmed strong isolation properties through experimental validation.
Article
Engineering, Civil
Ting Ting Huang, Xin Ren, Yi Zeng, Yi Zhang, Chen Luo, Xiang Yu Zhang, Yi Min Xie
Summary: Seismic metamaterial (SM) has gained significant attention in vibration isolation and damping due to its wave manipulation and bandgap properties. A novel 2D SM composed of auxetic foam and steel is proposed to attenuate seismic waves at ultra-low frequencies. Numerical simulations show that modifying the parameters of the components can enhance the bandgap and effectively attenuate seismic waves, aiming to cover the seismic peak spectrum at 2 Hz.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Yingli Li, Shiguang Yan, Yong Peng
Summary: The study proposed a single-phase 2D phononic crystal structure with tetragonal topology and cross-like pores, and both numerical simulation and theoretical analysis were performed to investigate the formation and regulation mechanism of bandgap and obtain broadband vibration attenuation capability. The results showed that X-shaped pores led to multiband and broadband characteristics, while cross-shaped pores opened wide bandgaps at low frequencies. The analytical formulations derived from structural mechanics accurately predicted the bandgap edge frequencies and provided effective guidance for bandgap tuning and structural design. Additionally, combining structures with different mass distributions enhanced the vibration mitigation capability. The lighter and easier fabricatable structure proposed in this study provided significant guidance for the design of tunable phononic devices.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Yongtao Bai, Xiaolei Li, Xuhong Zhou, Peng Li, Michael Beer
Summary: The low-frequency wide-bandgap characteristics of seismic metamaterials can effectively suppress vibration propagation and reduce the risk of extreme loadings like earthquakes. However, the high cost of seismic metamaterials made of general engineering materials due to the stringent requirement of lattice size has been a challenge. In this study, we propose a soil-expanded seismic metamaterial that overcomes the scale restriction and achieves desired bandgap characteristics through the transfer matrix method and finite difference method. Our findings demonstrate that the seismic metamaterial with rubber components can significantly suppress acceleration amplitudes by 90% in the wave propagation region, thereby reducing seismic risk in targeted areas, as confirmed by the response spectra.
MECHANICS OF MATERIALS
(2023)
Article
Acoustics
Seongmin Park, Wonju Jeon
Summary: Researchers proposed a tapered phononic beam with a unit cell consisting of two identical uniform parts and a thickness- and width-varying part. By controlling the geometrical parameters, the phononic beam achieved an ultra-broad and ultra-low frequency band gap from 3.6 Hz to 237.9 Hz.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Mechanical
Li -Fang Lin, Ze-Qi Lu, Long Zhao, Yi-Sheng Zheng, Hu Ding, Li-Qun Chen
Summary: Mechatronic metamaterials with tunable bandgaps are studied for vibration isolation. A mechatronic metamaterial beam with inductor-resistor-capacitor (LRC) shunting circuits is discussed, and its bandgaps can be adjusted by changing the circuit parameters. Experimental and analytical results support the effectiveness of the tunable bandgaps in achieving low-frequency vibration isolation. Electric parameters affect the position of the mechatronic resonant bandgap, allowing for customization of the vibration isolation frequency range.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Alya Alhammadi, Jin-You Lu, Mahra Almheiri, Fatima Alzaabi, Zineb Matouk, Mohamed Al Teneiji, Rashid K. Abu Al-Rub, Vincenzo Giannini, Dong-Wook Lee
Summary: The dispersion curves of the epoxy/tungsten carbide composite show that the propagation of elastic waves is prohibited inside the periodic structure, and increasing the number of inclusions and the filling fraction of the unit cell significantly broaden the phononic bandgap. The relationship between bandwidth and filling fraction of the composite structure was found to be nonmonotonic, influenced by spacing among inclusions and inclusion sizes.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Xu Gao, Jiyuan Wei, Jiajing Huo, Zhishuai Wan, Ying Li
Summary: An improved re-entrant negative Poisson's ratio metamaterial combining 3D printing and machining is proposed, which exhibits superior load-carrying and vibration isolation capacity compared to traditional materials. The bandgap of the metamaterial can be easily adjusted through different assemblies, and particle damping enhances the diversity of bandgap design and improves structural damping performance. Experimental and simulation results demonstrate a 300% increase in bearing capacity compared to traditional metamaterials, and increasing the density of metal assemblies achieves a vibration-suppressing bandgap with a lower frequency and wider bandwidth.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Civil
Yi Wang, Fang Yang, Jin-Shui Yang, Li-Li Tong, Shuang Li, Qi Liu, Gang-Ling Hou, Pei-Dong Sun, Mian Xing, Gang Zheng
Summary: Based on numerical simulation and experiments, a petal-shaped seismic metamaterial is proposed to change the internal scatterer into a structure consisting of four sectors. This structure can form an ultra-low frequency bandgap to effectively attenuate seismic waves and has potential applications in seismic isolation and attenuation of buildings.
Article
Nanoscience & Nanotechnology
Samuli Heiskanen, Tuomas A. Puurtinen, Ilari J. Maasilta
Summary: Controlling thermal transport at the nanoscale is crucial for various applications. This study demonstrates that thermal conductance can be controlled using three-dimensional phononic crystals, without the need for suspension. Experimental results show that at sub-Kelvin temperatures, these structures can enhance thermal conductivity.
Article
Engineering, Electrical & Electronic
Ahmed Mehaney, Ashour M. Ahmed, Hussein A. Elsayed, Arafa H. Aly, Walied Sabra
Summary: We have demonstrated and explored the effects of hydrostatic pressure on a one-dimensional phononic crystal. The proposed structure consists of a stack of polycrystalline silicon and polymethyl methacrylate (PMMA) for four unit cells. By using the transfer matrix method, we investigated the transmittance spectrum of the phononic crystal under different hydrostatic pressure. The results show that the phononic band gap (PnBG) can be controlled and tuned by adjusting the applied hydrostatic pressure.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Sung Hun Park, Haedong Park, Jwa-Min Nam, Yonggang Ke, Tim Liedl, Ye Tian, Seungwoo Lee
Summary: Moulding the flow of phononic waves in 3D space is critical for controlling sound and thermal properties. DNA origami-designed 3D crystals can serve as hypersonic 3D phononic crystals (PnCs) with the widest complete phononic bandgap (PnBG). This provides a blueprint for the design and fabrication of mesoscale 3D PnCs with optimal lattice geometry.
Article
Engineering, Mechanical
Qian Geng, Lingyi Kong, Xiongwei Yang, Zhushan Shao, Yueming Li
Summary: This study proposes an easy-to-implement design of a phononic crystal pipe that utilizes attached sleeves to suppress flexural vibration. By utilizing the mechanism of Bragg scattering, a flexural wave bandgap can be obtained through periodic changes in the cross section of the sleeved pipe. The installation of the sleeves simultaneously adds mass and stiffness, resulting in parabolic variations in the bandgap edge frequencies against sleeve dimensions. The asynchronous recovery of the two frequency loci causes the bandgap to close when the sleeve covers approximately half the length of the unit cell. This feature is not observed in analyses of binary phononic crystal pipes. Equivalent models are proposed to discuss the predicted variations, and the singular dependence of bandgap closure on sleeve length is theoretically explained. Experiments validate the feasibility of attaching sleeves for flexural vibration suppression of pipes. The proposed design effectively attenuates vibration energy within the intended bandgap.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Civil
Emad Panahi, Ali Hosseinkhani, Mohammad Farid Khansanami, Davood Younesian, Mostafa Ranjbar
Summary: This study investigates the elastic wave dispersion characteristics of two novel unit-cells through numerical and experimental methods, showing that they have a wide phononic bandgap coverage factor and the location of bandgaps can be tuned by modifying the topology of unit-cells. The results of the numerical and experimental models match perfectly, demonstrating the practical application of these new phononic crystals as a frequency tool to stop the propagation of elastic waves.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Mechanical
Pengcheng Zhao, Kai Zhang, Liyuan Qi, Zichen Deng
Summary: This paper investigates the dynamic properties of a 3D chiral mechanical metamaterial, showing that the isotactic configuration converts longitudinal waves into transverse waves due to chirality, leading to vibration attenuation independent of band gaps. Band gaps appear in the syndiotactic configuration's band structures, and the vibration mode of ligaments can be used to predict band gaps. The study also demonstrates the potential for practical applications of vibration suppression using gradient and programmable design.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xi Hai Ni, Xue Gang Zhang, Dong Han, Yi Zhang, Wei Jiang, Xing Chi Teng, Jian Hao, Xin Ren
Summary: In this study, a double tubular structure composed of auxetic tubular structures and aluminum foam was proposed. The mechanical properties of aluminum foam-filled auxetic tubular structures and conventional tubes were compared under uniaxial compression, both numerically and experimentally. The results showed that the aluminum foam-filled auxetic double tubular structures exhibited stable compression deformation and superior energy absorption, due to the stronger interaction between the aluminum foam and the auxetic tube. Although the bearing capacity of the double tubular structures was lower, it overcame the drawbacks of larger peak force and load fluctuation in conventional tubes.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Yang Pan, Xue Gang Zhang, Dong Han, Wei Li, Lin Fang Xu, Yi Zhang, Wei Jiang, Sai Bao, Xing Chi Teng, Tao Lai, Xin Ren
Summary: This study investigated the out-of-plane mechanical properties and deformation patterns of a recently proposed auxetic structure, the chiral lattice with circular nodes (NCL), under quasi-static uniaxial compression. The results showed that the NCL structure had superior energy absorption capacity in the out-of-plane direction compared to two benchmarks, the truss lattice and traditional chiral lattice (TCL). Parametric studies were also conducted to investigate the effects of geometric parameters and volume fraction on the structural deformation patterns and mechanical properties.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Dong Han, Yi Zhang, Xiang Yu Zhang, Yi Min Xie, Xin Ren
Summary: Novel auxetic tubes (NAT) were designed, fabricated and examined, showing improved specific energy absorption (SEA) without sacrificing the auxetic characteristic. The effect of unit cell parameters on the mechanical properties of NAT tubes was explored, suggesting that rib reduction can enhance SEA without sacrificing the auxetic effect. Three novel ribbed auxetic tubes (NRAT) were proposed, with the addition of a straight rib to the inner long axis of the ellipse found to improve SEA. The larger the straight rib width, the higher the energy absorption. The stability of 3D auxetic tubular metamaterial was found to be greater than that of 2D auxetic thin-plate metamaterial.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Xin Ren, Dong Han, Long Sun, Xue Gang Zhang, Wei Jiang, Zhi Tao, Yi Min Xie, Fan Yang, Guo Xing Lu
Summary: Aluminum foam-filled circular auxetic metamaterials were designed and investigated in this study. The mechanical properties and deformation modes of the proposed aluminum foam-filled auxetic tubes were analyzed using experimental and numerical methods. The energy contribution ratio of the interaction between the aluminum foam and auxetic tube improves with the aluminum foam's density. The AFFAT with a higher ratio of the elliptical major axis to the minor axis has increased compression load efficiency. Among the investigated composite structures, the AFFAT has the highest compression load efficiency.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Ru Yuan Huo, Dong Han, Yi Zhang, Wei Jiang, Le Yang Fan, Xin Wei Peng, Ge Chen Jie Shi, Ming Hao Chu, Xiang Yu Zhang, Yi Min Xie, Xin Ren
Summary: The incorporation of aluminum foam in auxetic tubes enhances stability, stiffness and energy absorption. This study compared the mechanical properties of auxetic circular and square tubes. The foam-filled auxetic square tube (FFAST) showed the best specific energy absorption (SEA) of 1.45 and exhibited a pronounced auxetic effect. The finite element method was used to analyze FFAST, finding that thinner wall thickness leads to greater SEA and decreasing ellipticity increases yield load and SEA.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Hang Hang Xu, Hui Chen Luo, Xue Gang Zhang, Wei Jiang, Xing Chi Teng, Wei Qiu Chen, Jie Yang, Yi Min Xie, Xin Ren
Summary: Auxetic materials have been extensively studied due to their unique mechanical properties and deformation modes. However, their practical engineering applications are limited by their low stiffness. This study combines re-entrant aluminum honeycomb with aluminum foam to enhance the stiffness of auxetic materials. Experimental and numerical investigations on the mechanical properties and deformation modes are conducted, along with the analysis of the effects of geometrical parameters. The proposed auxetic composite structures show promising applications in vehicle engineering, protective engineering, and aerospace engineering due to their superior performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Civil
Wei Jiang, Xue Gang Zhang, Dong Han, Lu Wang, Wei Qiu Chen, Yi Min Xie, Xin Ren
Summary: This article presents a novel fabrication methodology for auxetics by assembling plates and tubes, instead of using costly and inefficient manufacturing processes like 3D printing and laser cutting. The proposed structures show favorable mechanical performance and low-cost, large-scale fabrication potential, making them promising for applications in protective equipment and smart energy absorbers.
THIN-WALLED STRUCTURES
(2023)
Article
Instruments & Instrumentation
Zeyao Chen, Junhao Li, Baisheng Wu, Xin Chen, Xin Ren, Yi Min Xie
Summary: This study proposes a hedgehog biomimetic helmet with auxetic lattice liners that provides superior protection in mitigating traumatic brain injury (TBI). The simulation model evaluates the helmet's performance in reducing TBI risks and shows significant reduction in head injury criterion value. Parametric studies and optimization design result in a lightweight auxetic lattice liner with superior protective performance.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Xing Chi Teng, Xi Hai Ni, Xue Gang Zhang, Wei Jiang, Yi Zhang, Hang Hang Xu, Jian Hao, Yi Min Xie, Xin Ren
Summary: This paper proposes a new stretchable sandwich structure and investigates its influence on the mechanical properties of traditional sandwich structures through experiments and finite element methods. The results show that the stretchable sandwich structures have good stress and energy absorption capacity, as well as the ability of in-plane deformation and active bending. Furthermore, by combining the functional characteristics of sandwich structures and rotating polygons, the stretchable sandwich structures can adjust their surface area, porosity, and in-plane negative Poisson's ratio effect while maintaining bearing capacity.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Xue Gang Zhang, Wei Jiang, Yi Zhang, Dong Han, Chen Luo, Xiang Yu Zhang, Jian Hao, Yi Min Xie, Xin Ren
Summary: This study proposes two 3D honeycomb structures, namely 3D re-entrant honeycomb and 3D hexagonal honeycomb, and investigates their mechanical properties, deformation modes, and deformation mechanisms under three-point bending through experimental and numerical analysis. Compared to the non-auxetic hexagonal honeycomb, the 3D auxetic re-entrant honeycomb exhibits higher ductility and fracture resistance. Additionally, the mid-span section of the 3D auxetic honeycomb shows a trapezoidal deformation mode under bending, which differs from the conventional honeycomb structure. The influence of the number of unit cells and geometric parameters on the mechanical properties of the 3D honeycomb structure is also systematically studied. The excellent bending performance of the auxetic honeycomb provides a basis for its application in biomedicine, soft robots, and buffer devices.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Jian Ping Lang, Dong Han, Xue Gang Zhang, Wei Jiang, Yi Zhang, Xi hai Ni, Jian Hao, Xing Chi Teng, Xin Ren
Summary: This paper proposes a novel star-shaped tubular lattice structure (STL) with exceptional auxetic effect. Numerical and experimental studies demonstrate its low peak stresses under lateral loading, superior bearing capacity and stability under axial compression, providing new perspectives and reference for the mechanical design of star-shaped tubular structures.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Renbing An, Jiacong Yuan, Yi Pan, Duhang Yi
Summary: Traditional timber structures built on sloped land are more susceptible to seismic damage compared to structures built on flat land. The upper portion of the structure is found to be the weak point on sloped land, with potential issues such as tenon failure and column foot sliding.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Elyas Bayat, Federica Tubino
Summary: The current design guidelines for assessing floor vibration performance do not consider the influence of variability in the walking path on the dynamic response of floors. This study investigates the dynamic response of floors under a single pedestrian walking load, taking into account the randomness of the walking path and load. The effectiveness of the current guidelines in predicting floor response is critically assessed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Gao Ma, Chunxu Hou, Hyeon-Jong Hwang, Linghui Chen, Zhenhao Zhang
Summary: Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. This study proposed a repairable column with UHPC segments and replaceable energy dissipaters. The test results showed that the columns with UHPC segments and replaceable dissipaters exhibited high strength, deformation capacity, and energy dissipation.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Kartheek S. M. Sonti, Pavan Kumar Penumakala, Suresh Kumar Reddy Narala, S. Vincent
Summary: In this study, the compressive behavior of alumina hollow particles reinforced aluminum matrix syntactic foams (AMSF) was investigated using analytical, numerical, and experimental methods. The results showed that the FE solver ABAQUS could accurately predict the elastic and elastio-plastic behavior of AMSFs. The study also suggested that FE models have great potential in developing new materials and composites under compression loading.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Zheqi Peng, Xin Wang, Zhishen Wu
Summary: In this study, the statistical modeling of fiber-reinforced polymer (FRP) cables using the classic fiber bundle model is explored. The study considers important features of large-scale multi-tendon FRP cables, such as initial random slack and uneven tensile deformation among tendons. A parametric study and reliability analysis are conducted to predict the load-displacement relation and design thousand-meter-scale FRP cables. The study emphasizes the relation between the reliability index beta of the cable and the safety factor gamma of the FRP material.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Yanchao Shi, Shaozeng Liu, Ye Hu, Zhong-Xian Li, Yang Ding
Summary: This paper introduces a damage assessment method for reinforced concrete (RC) columns under blast loading, using modal parameter measurement as the evaluation index. The validity of the proposed method is validated through numerical and experimental analysis. The results show that this modal-based damage assessment method is applicable for non-destructive evaluation of blast-induced damage of RC columns.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Xiaolin Zou, Maosheng Gong, Zhanxuan Zuo, Qifang Liu
Summary: This paper proposes an efficient framework for assessing the collapse capacity of structures in earthquake engineering. The framework is based on an accurate equivalent single-degree-of-freedom (ESDOF) system, calibrated by a meta-heuristic optimization method. The proposed framework has been validated through case studies, confirming its accuracy and efficiency.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jie Hu, Weiping Wen, Chenyu Zhang, Changhai Zhai, Shunshun Pei, Zhenghui Wang
Summary: A deep learning-based rapid peak seismic response prediction model is proposed for the most common two-story and three-span subway stations. The model predicts the peak seismic responses of subway stations using a data-driven approach and limited information, achieving good predictive performance and generalization ability, and demonstrating significantly higher computational efficiency compared to numerical simulation methods.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jin Ho Lee, Jeong-Rae Cho
Summary: A simplified model is proposed to estimate the earthquake responses of a rectangular liquid storage tank considering the fluid-structure interactions. The complex three-dimensional structural behavior of the tank is represented by a combination of fundamental modes of a rectangular-ring-shaped frame structure and a cantilever beam. The system's governing equation is derived, and earthquake responses such as deflection, hydrodynamic pressure, base shear, and overturning moment are obtained from the solution.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
W. J. Lewis, J. M. Russell, T. Q. Li
Summary: The work discusses the key features and advantages of optimal 2-pin arches shaped by statistically prevalent load and constant axial stress. It extends the design space of symmetric arches to cover asymmetric forms and provides minimum values of constant stress for form-finding of such arches made of different materials. The analysis shows that constant stress arches exhibit minimal stress response and have potential implications for sustainability and durability of future infrastructure.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Wen-ming Zhang, Han-xu Zou, Jia-qi Chang, Tian-cheng Liu
Summary: Saddle position is crucial in the construction and control of suspension bridges. This study proposes an analytical approach to estimate the saddle positions in the completed bridge state and discusses the calculation under different definitions. The relationship between the saddle position and the tower's centerline is analyzed, along with the eccentric compression of the tower. The feasibility of the proposed method is verified through a real-life suspension bridge.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Shaise K. John, Alessio Cascardi, Yashida Nadir
Summary: This study experimentally investigated the use of TRM material for reinforcing concrete columns. The results showed that increasing the number of textile layers effectively increased the axial strength. Additionally, the choice of fiber type and hybrid textile configuration also had a significant impact on strength improvement. A new design model that considers the effects of both the confining matrix and textile was proposed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chandrashekhar Lakavath, S. Suriya Prakash
Summary: This study experimentally investigated the shear behavior of post-tensioned UHPFRC girders, considering factors such as prestress level, fiber volume fraction, and types of steel fibers. The results showed that increasing prestress and fiber dosage could enhance the ultimate load-carrying capacity of the girders, reduce crack angle, and increase shear cracking load.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Vahid Goodarzimehr, Siamak Talatahari, Saeed Shojaee, Amir H. Gandomi
Summary: In this paper, an Improved Marine Predators Algorithm (IMPA) is proposed for size and shape optimization of truss structures subject to natural frequency constraints. The results indicate that IMPA performs better in solving these nonlinear structural optimization problems compared to other state-of-the-art algorithms.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chun-Xu Qu, Jin-Zhao Jiang, Ting-Hua Yi, Hong-Nan Li
Summary: In this paper, a computer vision-based method is proposed to monitor the deformation and displacement of building structures by obtaining 3D coordinates of surface feature points. The method can acquire a large number of 3D coordinates in a noncontact form, improve the flexibility and density of measurement point layout, and is simple and cost-effective to operate.
ENGINEERING STRUCTURES
(2024)