Article
Mechanics
Feng Jiang, Shu Yang, Chang Qi
Summary: In this study, a new type of three-dimensional auxetic metamaterial was proposed and its crushing response under quasi-static compression was investigated through experimental tests and numerical simulations. The results showed that the proposed metamaterial exhibited an X deformation mode and had a higher energy absorption capacity compared to other structures. Additionally, the effects of geometric parameters and friction coefficient on the material's performance were also studied.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Xiaolong Zhang, Ruilan Tian, Ziwen Zhang, Guijing Li, Wenjie Feng
Summary: A new vertical strut combined re-entrant auxetic structure has been designed and studied for its mechanical behaviors. Results showed that lightweight structures can significantly enhance auxetic behavior and achieve a high degree of anisotropy compared with conventional re-entrant honeycomb configurations.
THIN-WALLED STRUCTURES
(2021)
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
Engineering, Mechanical
Kang-Jia Liu, Hai-Tao Liu, Jie Li
Summary: This paper proposes a bi-material triangle re-entrant honeycomb (BTRH) structure with tunable coefficient of thermal expansion (CTE), Poisson's ratio (PR), and bandgap. Analytical analysis and numerical simulations are used to quantify the changes in effective CTE, PR, and Young's modulus. Experiments are conducted to validate the theory of effective PR and Young's modulus. The band structures are calculated through finite element analysis, and the effects of geometric parameters and material combinations on mechanical properties are systematically investigated.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
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
Mechanics
Rahul Singh Dhari, Zia Javanbakht, Wayne Hall
Summary: This study reveals the micro deformation mechanisms of the reentrant honeycomb structure under inclined loading, showing a transition stage that delays reaching peak energy efficiency, and demonstrates that the performance of the RH structure does not deteriorate under inclined cases.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Chang Qi, Feng J. Iang, Shu Yang, Alex Remennikov
Summary: In this study, the mechanical properties of REC honeycombs with different geometric parameters were thoroughly investigated through finite element simulations and theoretical analyses. It was found that adjusting the geometric parameters of the unit cell can tailor the crushing stress, energy absorption characteristics, and NPR value of the honeycomb, triggering specific deformation mechanisms at meso and macro scales. The study provides insights for engineering applications by revealing the effects of geometric parameters on the energy absorption capabilities and NPR values of REC honeycombs.
THIN-WALLED STRUCTURES
(2021)
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
Engineering, Mechanical
Lumin Shen, Zhonggang Wang, Xinxin Wang, Kai Wei
Summary: The mechanical properties of a vertex-based hierarchical re-entrant honeycomb structure were investigated in this study. The overlapping effect of struts on relative density was considered, the theoretical model for evaluating Young's modulus and Poisson's ratio was implemented, and the elastic properties of the structure can be designed by adjusting geometric parameters. Comparisons between different honeycomb structures suggest that embedding a re-entrant honeycomb at the vertex is an effective way to enhance elastic modulus while maintaining a negative Poisson's ratio.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Wei Min Wang, Jun Hu
Summary: This study examines the effects of microstructure on the energy absorption and crashworthiness of a novel honeycomb material. By designing a new type of re-entrant triangular honeycomb and studying its dynamic crushing behavior using nonlinear finite element method, the researchers find that the novel honeycomb exhibits rich deformation modes under different impact velocities and shows higher energy-absorbing capacity and crashworthiness for mid-velocity crushing.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Civil
Yilin Zhu, Yi Luo, Defeng Gao, Chao Yu, Xin Ren, Chuanzeng Zhang
Summary: A novel 2D re-entrant auxetic honeycomb metamaterial is proposed in this study, which enhances stiffness without compromising auxeticity, while still being convenient and low-cost for fabrication by introducing zigzag inclined ligaments.
ENGINEERING STRUCTURES
(2022)
Article
Mechanics
Huiling Wang, Junhua Shao, Wei Zhang, Zhi Yan, Zhengyi Huang, Xuan Liang
Summary: This article experimentally and numerically studied the response and energy absorption of novel sandwich beams with combined re-entrant double-arrow auxetic honeycomb (RDAH) cores subjected to three-point bending. The results show that the RDAH core sandwich beam has better load-carrying and energy absorption capacity when the loading roller is located directly above the re-entrant cell. In addition, factors such as face sheet distribution, cell-wall thickness, impact velocity, and cell configuration also have an influence on the structural response.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Xiaolong Zhang, Huanan Hao, Ruilan Tian, Qiang Xue, Huaitong Guan, Xinwei Yang
Summary: In this work, a novel auxetic metamaterial with enhanced energy-absorption performance is proposed. The study investigates the quasi-static compression and dynamic crushing behaviors of the vertical strut combined auxetic metamaterial through simulation and theoretical analysis. The results show that the material exhibits a hierarchical deformation mode and possesses higher mean plateau stress and specific energy-absorption compared to other structures.
COMPOSITE STRUCTURES
(2022)
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
Materials Science, Multidisciplinary
Zijian Zhang, Li'ao Zhang, Yangyang Dong, Heng Chen, Yipan Guo
Summary: A cosine-shaped re-entrant structure negative Poisson's ratio metamaterial is proposed to address the issues of stress concentration and negative Poisson's ratio. Different configurations of improved re-entrant structural elements are designed by optimizing the inclined beams. Experimental results show that the improved structure can significantly reduce stress and increase the negative Poisson's ratio.
Article
Engineering, Civil
Jian Xue, Weiwei Zhang, Jing Wu, Chao Wang, Hongwei Ma
Summary: This study integrates a plate-type local resonator with varying free boundaries within a plate to convert the initial low-order global vibration modes into localized vibration modes. A novel semi-analytical method is proposed to analyze the free vibration of the plate with thickness and displacement discontinuities. The results show that by applying free boundary conditions, the low-order localized vibration frequencies can be significantly reduced without affecting the low-order global frequencies.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Merve Tunay
Summary: In recent years, there has been an increasing number of studies on the mechanical properties of sandwich structures manufactured with the Fused Deposition Modeling (FDM) method. However, there is still a lack of experimental data on the mechanical characteristics of FDM-manufactured sandwich structures under different thermal aging durations. In this experiment, the energy absorption capabilities of sandwich structures with different core geometries were investigated under various thermal aging durations. The results showed that the core topology significantly influenced the energy absorption abilities of the sandwich structures.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Zi-qin Jiang, Zi-yao Niu, Ai-Lin Zhang, Xue-chun Liu
Summary: This paper proposes a crosssection corrugated plate steel special-shaped column (CCSC) that improves the bearing capacity and overall stability of structural columns by using smaller material input. Through theoretical analysis and numerical simulation, the overall stability of the CCSC under axial compression is analyzed. The design method and suggestions for the stability of CCSC are put forward. Compared with conventional square steel tube columns, the CCSC has obvious advantages in overall stability and steel consumption.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yong Zhang, Yangang Chen, Jixiang Li, Jiacheng Wu, Liang Qian, Yuanqiang Tan, Kunyuan Li, Guoyao Zeng
Summary: A hybrid TPMS method was proposed to develop a new TPMS structure, and the mechanical properties of different TPMS structures were studied experimentally and numerically. Results showed that the hybrid TPMS structure had higher energy absorption and lower load-carrying capacity fluctuation. Further investigations revealed that the topological shape and material distribution had significant influence on mechanical properties, and the hybrid additive TPMS structure exhibited significant crashworthiness advantage in in-plane crushing condition.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Tongfei Sun, Ye Liu, Kaoshan Dai, Alfredo Camara, Yujie Lu, Lijie Wang
Summary: This paper presents a series of experimental and numerical studies on the performance of a novel double-stage coupling damper (DSCD). The effects of damper configuration, friction-yield ratio (Rfy), and loading protocol on the hysteresis performance of the DSCD are investigated. The test results demonstrate that the arrangement of ribs in the DSCD increases its energy dissipation capacity. Numerical analysis reveals that the length of the friction mechanism and the clearance between the yield segment and the restraining system affect the energy dissipation and stability of the damper.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Jeonghwa Lee, Young Jong Kang
Summary: This study investigates the local buckling behavior and strength of I-shape structural sections by considering flange-web interactions through three-dimensional finite element analysis. The study provides a more reasonable estimation of local buckling strength by considering the ratio of flange-web slenderness and height-to-width ratio, and presents design equations for flange local and web-bend buckling coefficients.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yizhe Chen, Wenfeng Xiang, Qingsong Zhang, Hui Wang, Lin Hua
Summary: This study investigates the surface modification of a nickel plate to improve the bonding strength with carbon fiber-reinforced plastics (CFRP). The results show that different surface modification methods, including sandblasting, coupling agent treatment, and compound coupling agent treatment, significantly enhance the bonding strength of CFRP/Ni joints. The research provides insights into improving the connection between nickel and CFRP, as well as other heterogeneous materials.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Agha Intizar Mehdi, Fengping Zhang, Moon-Young Kim
Summary: A spatial stability theory of mono-symmetric thin-walled steel beams pre-stressed by spatially inclined cables is derived and its validity is demonstrated through numerical examples. The effects of initial tension, deviator numbers, inclined cable profiles, and bonded/un-bonded conditions on lateral-torsional buckling of the pre-stressed beams are investigated, with a specific emphasis on the effects of increasing initial tension.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Teng Ma, Jinxiang Wang, Liangtao Liu, Heng Li, Kui Tang, Yangchen Gu, Yifan Zhang
Summary: The structural response of water-back plate under the combined action of shock wave and bubble loads at water depths of 1-300 m was numerically investigated using an arbitrary Lagrange-Euler method. The accuracy of the numerical model was validated by comparing with experimental and theoretical results. The influences of water depth and length-to-diameter ratio of the charge on the combined damage effect were analyzed. The results show that as water depth increases, the plastic deformation energy of the water-back plate decreases, and the permanent deformation mode changes from convex to concave. When the charge has a large length-to-diameter ratio, the plastic deformation energy of the radial plate is higher than that of the axial plate, and the difference decreases with increasing water depth. Increasing the length-to-diameter ratio enhances the combined damage effect in the radial direction in deep-water environments.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiu-Yun Li, Ben Young
Summary: This paper investigates the flexural performance of CFS zed section members bent about the neutral axis parallel to the flanges through experimental and numerical analysis. The results show that the current direct strength method generally provides conservative predictions for the flexural strength of unstiffened zed section members, but slightly unconservative design for edge-stiffened zed section beams. The nominal flexural strengths of zed section members with edge stiffeners were found to be underestimated by 17% to 21% on average. Modified DSM formulae are recommended for the design of CFS zed section beams.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Weinan Gao, Bo Song, Xueyan Chen, Guochang Lin, Huifeng Tan
Summary: This paper presents a precise method for predicting deformation in large-scale inflatable structures, utilizing finite element modeling and laser scanning technique. The study shows a good agreement between the predictive model and non-contact measurement results.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Fei Gao, Zongyi Wang, Rui Zhu, Zhenming Chen, Quanxi Ye, Yaqi Duan, Yunlong Jia, Qin Zhang
Summary: This research investigates the mechanical properties of high-strength ring groove rivet assemblies and the load resistances of riveted T-stubs. Experimental tests reveal that Grade 10.9 rivets have higher yield strength and strain, and lower ultimate strain, making them suitable for high-strength ring groove rivet connections. Increasing the rivet diameter benefits the T-stubs, while increasing the flange thickness is not always advantageous. The Eurocode 3 method is not suitable for T-stubs connected through ring groove rivets, while the Demonceau method is conservative.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Shangchun Jiang, Liangfeng Sun, Haifei Zhan, Zhuoqun Zheng, Xijian Peng, Chaofeng Lue
Summary: This study investigates the bending behavior of two-dimensional nanomaterials, diamane and its analogous structure TBGIB, through atomistic simulations. It reveals that diamane experiences structural failure under bending, while TBGIB bends elastically before undergoing structural failure. The study provides valuable insights for the application of these materials in flexible electronics.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiang Zhang, Jianian Wen, Qiang Han, Hanqing Zhuge, Yulong Zhou
Summary: In this study, the mechanical properties of Q690 steel H-section columns under bi-directional cyclic loads are investigated, considering the time-varying characteristics of corrosion. A refined finite element (FE) model is built to analyze the degradation of mechanical property and failure mechanisms of steel columns with different design parameters during the whole life-cycle. The study proposes a quantitative calculation method for the ultimate resistance and damage index of steel columns, taking into account the ageing effects. The findings emphasize the importance of considering the ageing effects of steel columns in seismic design.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yuda Hu, Qi Zhou, Tao Yang
Summary: The magneto-thermo-elastic coupled free vibration of functionally graded materials cylindrical shell is investigated in this study. The vibration equation in multi-physical field is established and solved using the Hamilton principle and the multi-scale method. The numerical results show that the natural frequency is influenced by various factors such as volume fraction index, initial amplitude, temperature, and magnetic induction intensity.
THIN-WALLED STRUCTURES
(2024)