Article
Mechanics
Qida Lin, Jiaxi Zhou, Kai Wang, Daolin Xu, Guilin Wen, Qiang Wang
Summary: This paper introduces a new class of three-dimensional locally resonant (LR) metamaterials with quasi-zero stiffness (QZS) property. The monolithic QZS property is achieved by optimizing the three-dimensional resonator. The characteristics of wave propagation in the proposed 3D QZS metamaterial are investigated and a lumped-mass-spring model is developed to derive the dispersion relation. The study reveals the formation mechanism of low-frequency complete band gap and suggests a feasible approach for opening a low-frequency and wide complete band gap.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Zeyi Li, Kai Wang, Tingting Chen, Li Cheng, Daolin Xu, Jiaxi Zhou
Summary: This study proposes the use of shape memory alloys (SMAs) to achieve temperature-controlled quasi-zero-stiffness (TC-QZS) metamaterial beam. The TC-QZS resonator can effectively neutralize the positive stiffness mechanism and adjust the neutralization based on temperature changes, resulting in a broad-range tunability of the resonant frequency.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Changqi Cai, Jiaxi Zhou, Kai Wang, Hongbin Pan, Dongguo Tan, Daolin Xu, Guilin Wen, John E. Mottershead
Summary: This paper proposes a novel metamaterial beam with an embedded quasi-zero-stiffness resonator to achieve wave attenuation in very low-frequency band gaps. The configuration of the quasi-zero-stiffness resonator is developed using compliant mechanism with design optimization, and the characteristic of quasi zero stiffness is achieved by proper pre-compression. The dispersion relations of the metamaterial beam are derived using the transfer matrix method, and the dynamic responses of the beam are obtained using the spectral element method to evaluate the transmittance of the flexural wave. Experimental investigation verifies the formation mechanism of the band gaps, demonstrating very low-frequency band gaps. Therefore, the QZS metamaterial beam holds promise for low wave attenuation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Qida Lin, Jiaxi Zhou, Kai Wang, Daolin Xu, Guilin Wen, Qiang Wang, Changqi Cai
Summary: This paper develops a novel type of 2D locally resonant metamaterials with quasi-zero stiffness in both horizontal and vertical directions. The QZS property is achieved through design optimization of the elastic elements of the resonator. Theoretical models and analysis reveal the formation mechanism of the band gap attributed to local resonance and the effects of pre-compression and added mass on the starting frequency of the complete band gap. This study provides insights for achieving low-frequency complete band gap regardless of the incident direction of in-plane wave.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Jiaxi Zhou, Hongbin Pan, Changqi Cai, Daolin Xu
Summary: This study designed a one-dimensional metamaterial for attenuating ultra-low frequency waves, achieving quasi-zero stiffness through optimized configuration with adjustable band gap structure. Results show that band gap can be tuned by changing pre-compression, enabling attenuation of ultra-low frequency waves.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2021)
Article
Acoustics
Changqi Cai, Jiaxi Zhou, Kai Wang, Daolin Xu, Guilin Wen
Summary: In this study, a novel metamaterial plate with attached compliant quasi-zero-stiffness resonators is proposed to achieve wave attenuation at ultra-low frequencies. The theoretical investigations and experimental results demonstrate that the QZS metamaterial plate exhibits excellent attenuation in the ultra-low-frequency band gaps.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Physics, Multidisciplinary
Xu Qiang-Rong, Shen Cheng, Han Feng, Lu Tian-Jian
Summary: A novel local resonant acoustic metamaterial plate with quasi-zero stiffness is proposed for effective broadband insulation of sound at low frequencies. Numerical simulations and experimental measurements demonstrate that the metastructure exhibits great insulation performance around the local resonance frequency, achieving a transmission loss of 30 dB around 10 Hz. The physical mechanism behind its superior insulation performance is explored through analysis of equivalent mass density, reflection coefficient, and acoustic impedance ratio.
ACTA PHYSICA SINICA
(2021)
Article
Engineering, Civil
Changqi Cai, Jiaxi Zhou, Kai Wang, Qida Lin, Daolin Xu, Guilin Wen
Summary: A novel metamaterial pipe with attached compliant quasi-zerostiffness (QZS) resonators is proposed to attenuate low-frequency wave in pipes. The compliant resonator with twelve compliant multi-segment curved beams is designed to achieve quasi-zero stiffness. Theoretical investigations using the transfer matrix method (TMM) show the dispersion relation and reveal the band gap of the QZS metamaterial pipe. Numerical analysis using the finite element model confirms the wave attenuation performance of the metamaterial pipe in the low-frequency band gap.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Guangdong Sui, Xiaofan Zhang, Shuai Hou, Xiaobiao Shan, Weijie Hou, Jianming Li
Summary: This paper proposes a quasi-zero stiffness (QZS) isolator based on an inclined trapezoidal beam to explore its advantages in low-frequency passive vibration isolation. Finite element simulation and experiments are conducted to investigate the nonlinearity and dynamic response of the QZS isolator. The results show that the proposed QZS isolator has a lower initial isolation frequency and higher isolation efficiency compared to equivalent linear isolators.
Article
Engineering, Mechanical
Chen Zhang, Junsen He, Guiqian Zhou, Kai Wang, Daolin Xu, Jiaxi Zhou
Summary: The study proposes a compliant quasi-zero-stiffness (CQZS) isolator to isolate low-frequency torsional vibrations in the shaft system. The configuration of the CQZS isolator is devised using a compliant mechanism, and its stiffness characteristics are deduced and verified analytically and numerically. A dynamic model of the shaft system integrated with the CQZS isolator is established, and theoretical analysis is conducted using the harmonic balance method. Experimental results confirm the effectiveness of the CQZS isolator in achieving ideal torsional quasi-zero-stiffness characteristics and low-frequency torsional vibration isolation. The proposed CQZS isolator is more compact, lightweight, and easier to manufacture than conventional isolators.
MECHANISM AND MACHINE THEORY
(2023)
Article
Acoustics
Buliang Xie, Meiping Sheng, Minqing Wang, Zhiwei Guo, Shuai Wang, Qiaojiao Li
Summary: In this study, ultralow-frequency band gaps are achieved to suppress the propagation of ultralow-frequency flexural waves by designing beams with periodically attached quasi-zero-stiffness (QZS) resonators. The study investigates the effect of stiffness ratio on the bandgap characteristic and demonstrates that the band gaps can be easily transferred to lower or even ultralow frequencies without weakening the static stiffness of the resonators. Furthermore, the study explores the flexural wave propagation in locally resonant beams consisting of multiple periodic arrays of QZS resonators and shows that differential design of bandgap frequencies can be easily realized to obtain broadband flexural wave suppression performance.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Mechanical
Kai Wang, Jiaxi Zhou, Huajiang Ouyang, Yaopeng Chang, Daolin Xu
Summary: This paper introduces a novel QZS-TENG by combining a quasi-zero-stiffness mechanism and a triboelectric nanogenerator. The QZS system with a negative stiffness mechanism achieves ultra-low stiffness in a larger displacement region, leading to excellent energy harvesting performance in the ultra-low frequency region. The study provides a new application of a QZS mechanism for harvesting ultralow-frequency vibration energy by integrating with a TENG.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Mohammad Abuabiah, Yazan Dabbas, Luqman Herzallah, Ihab H. Alsurakji, Mahmoud Assad, Peter Plapper
Summary: A vibration isolation system for vehicle seats has been designed in this study, which utilizes oblique springs, a vertical spring, and a sleeve air spring to achieve quasi-zero stiffness and support additional load. The system improves the vibration isolation performance of the seats for small vehicles.
APPLIED SCIENCES-BASEL
(2022)
Article
Acoustics
Hongye Ma, Ke Wang, Haifeng Zhao, Chong Zhao, Jing Xue, Chao Liang, Bo Yan
Summary: This paper proposes a tunable local resonance metamaterial with chiral buckling structures for low-frequency vibration isolation. The unit cell consists of the inner and outer buckling stiffness structure, basic structure, and local resonator. The bistability of the unit cells with different initial shapes of beams is investigated and compared. The dynamic responses of the metamaterial with simple unit cells and hybrid supercells are derived and analyzed. The results show that the unit cell with initially convex downward beams has strong bistability and determinate deformation modes. The metamaterial with simple unit cells has tunable and wide band gap and low-frequency vibration isolation. The metamaterial with hybrid supercells can further broaden the band gap width and lower the band gap frequency, which has up to 16 different band gap characteristics.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
Peng Ling, Lunlun Miao, Bingliang Ye, Jin You, Wenming Zhang, Bo Yan
Summary: Inspired by the three postures of a click beetle, a novel passive click-beetle-inspired structure (CBIS) with variable asymmetric stiffness characteristics is proposed and systematically investigated for stiffness tunning and low-frequency vibration isolation. The stiffness of CBIS can be easily tuned among negative, quasi-zero, zero, small positive by the initial assembly angle, length ratio and linear stiffness ratio. The zero stiffness (ZS) or quasi-zero stiffness (QZS) region of CBIS can be extremely huge under some special parameters, which can broaden the working range of CBIS and benefit to large-deflection vibration isolation. The proposed CBIS opens a new route towards tunning asymmetric stiffness for low frequency vibration isolation.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Physics, Applied
Kai Wang, Jiaxi Zhou, Daolin Xu, Huajiang Ouyang
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Engineering, Mechanical
Jiaxi Zhou, Lingling Dou, Kai Wang, Daolin Xu, Huajiang Ouyang
NONLINEAR DYNAMICS
(2019)
Article
Physics, Applied
Kai Wang, Jiaxi Zhou, Qiang Wang, Huajiang Ouyang, Daolin Xu
APPLIED PHYSICS LETTERS
(2019)
Article
Engineering, Mechanical
Kai Wang, Jiaxi Zhou, Daolin Xu, Huajiang Ouyang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Engineering, Multidisciplinary
Kai Wang, Jiaxi Zhou, Changqi Cai, Daolin Xu, Huajiang Ouyang
APPLIED MATHEMATICAL MODELLING
(2019)
Article
Engineering, Civil
Jie Liu, Haifeng Ou, Rong Zeng, Jiaxi Zhou, Kai Long, Guilin Wen, Yi Min Xie
THIN-WALLED STRUCTURES
(2019)
Article
Engineering, Mechanical
Qiang Wang, Jiaxi Zhou, Daolin Xu, Huajiang Ouyang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Engineering, Mechanical
Kai Wang, Jiaxi Zhou, Huajiang Ouyang, Li Cheng, Daolin Xu
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Article
Engineering, Mechanical
Kai Wang, Jiaxi Zhou, Yaopeng Chang, Huajiang Ouyang, Daolin Xu, Yang Yang
NONLINEAR DYNAMICS
(2020)
Article
Engineering, Mechanical
Yang Yang, Huajiang Ouyang, Yiren Yang, Dengqing Cao, Kai Wang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Acoustics
Yaopeng Chang, Jiaxi Zhou, Kai Wang, Daolin Xu
Summary: This paper proposes a quasi-zero-stiffness (QZS) DVA for ultra-low frequency vibration absorption, which is designed using a simple oblique-spring model and verified for its dynamic behavior through the harmonic balance method (HBM) and numerical analyses. Experimental results demonstrate the excellent performance of QZS DVA in absorbing ultra-low frequency vibrations.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)