Article
Engineering, Mechanical
Yiqun Cao, Xiaoliang Geng, Hui Han, Yahui Lu, Jun Wang, Changan Zhao
Summary: This paper investigates the buckling performance of 3D printed lattice sandwich structures through theoretical analysis, numerical simulation, and mechanical tests. It compares two types of lattice structures and discusses the differences in their bearing capacities and toughness, as well as the different buckling modes. The results show that the rhombic dodecahedron lattice structure has higher bearing capacity and toughness compared to the body centered cubic lattice structure.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Mechanics
Tuan M. Hoang
Summary: The critical amount of intrinsic twist for buckling of chiral elastic rings may be greater than that for rings with no chirality, depending on the degree of chirality and twist-to-bend ratio. Increasing the twisting rigidity in relation to bending rigidity can raise the critical amount of twist, regardless of the degree of chirality. Weakly nonlinear analysis shows that postbuckling solutions of chiral elastic rings are stable for sufficiently large degree of chirality, in contrast to rings with intrinsic twist but no chirality where bifurcation is supercritical only for sufficiently large twist-to-bend ratio.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Engineering, Civil
Hamaidia Achref, Mohri Foudil, Damil Noureddine
Summary: The present study investigates the buckling strength of braced thin-walled columns under bending and torsional modes. The torsion buckling modes of braced columns have been overlooked in design and not adequately assessed. Elastic discrete springs in bending and torsion are taken into account to control the buckling behavior. Analytical solutions are derived for bending and torsion buckling modes in the case of simply supported struts with doubly symmetric cross sections. The finite element approach is implemented for more general cases considering 3D elastic springs and arbitrary cross sections. The efficiency of the closed-form solutions and the numerical approach is successfully verified, and the effect of braces in enhancing the buckling capacity is studied.
THIN-WALLED STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Mariachiara Manoccio, Marco Esposito, Elisabetta Primiceri, Angelo Leo, Vittorianna Tasco, Massimo Cuscuna, Dmitry Zuev, Yali Sun, Giuseppe Maruccio, Alessandro Romano, Angelo Quattrini, Giuseppe Gigli, Adriana Passaseo
Summary: This study demonstrates the sensing capabilities of a chip-based metamaterial, combining 3D chiral geometry with a functional core-shell nanoarchitecture. The modified optical response of the chiral metamaterial allows for analysis in complex environments and efficient interaction with biomolecules, leading to high sensitivity detection of biomarkers. Measurements in spiked solution and human serum show the potential for early diagnostics and diseases progression monitoring in a range not accessible with common immunological assays, opening new perspectives for next-generation biomedical systems.
Article
Mechanics
S. E. Alavi, M. Nasimsobhan, J. F. Ganghoffer, A. Sinoimeri, M. Sadighi
Summary: A homogenization methodology is proposed for constructing effective Cosserat substitution media for heterogeneous materials, applicable to various architected materials exhibiting micropolar chiral effects. The method provides size-independent higher-order effective moduli and is validated through computation of effective micropolar moduli for periodic lattice materials.
Article
Physics, Condensed Matter
Tyler DeValk, Jonah Hestetune, Roderic S. Lakes
Summary: In this study, it was observed that the chiral gyroid lattice exhibits temperature-induced twist with the direction of twist corresponding to the sense of chirality. The Poisson's ratio of the gyroid is known to be about 0.3 with minimal dependence on size.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Mathematics, Interdisciplinary Applications
Yongxing Wang, Thomas Ranner, Thomas P. Ilett, Yan Xia, Netta Cohen
Summary: This article discusses the inverse problem of a Cosserat rod, where the position of the rod's centreline is given and the external forces, torques, and the orientation of the cross sections need to be determined. The inverse problem is formulated as an optimal control problem, with the position of the centreline as the objective function and the external force and torque as the control variables. The article proposes a monolithic, implicit numerical scheme and validates the forward formulation using a numerical benchmark. The solvability and stability of the inverse problem are tested using data from forward simulations. The article also applies the proposed method to study the locomotion of the nematode, Caenorhabditis elegans, combining mathematical modelling and laboratory data to gain insights into the worm's anatomical orientation beyond what can be observed through the laboratory data.
COMPUTATIONAL MECHANICS
(2023)
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
Engineering, Mechanical
Hao Zeng, Ruinan Mu, Keyan Huo, Haifeng Zhao, Ke Wang, Anping Wang
Summary: This study proposes a novel metamaterial with periodic lattice-disc unit cells inspired by the tensegrity topological configuration for energy attenuation. The effects of geometrical dimensions on the bandgaps are examined through theoretical and numerical modeling, comparing monoatomic and diatomic chains. The dynamic attenuation effect of the bandgaps becomes prominent with the increase of unit cell numbers. The 3D-printable metamaterial is verified through frequency sweep experiments and low-speed impact tests, and validated with improved spring-mass and finite element models. This study provides a new idea for the design of additively-manufactured metamaterials for energy dissipation.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2023)
Article
Engineering, Mechanical
Chang Quan Lai, Kalaimani Markandan, Zhen Lu
Summary: The study investigates the elastic modulus and Poisson's ratio of a 3D anti-tetrachiral (3ATC) metamaterial design, finding that as the number of unit cells in the lattice decreases, the structure undergoes a symmetrical-to-asymmetrical transition leading to significant variations in Poisson's ratio at different relative densities.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mechanics
Zhenghong Li, Yuheng Liu, Yafei Wang, Haibao Lu, Ming Lei, Yong Qing Fu
Summary: In this study, a tunable Poisson's ratio shape-memory metamaterial with designable buckling responses was designed and experimentally investigated. The influence of viscoelasticity on in-plane moduli and Poisson's ratios of shape-memory auxetic metamaterial was studied, showing that thermomechanical properties govern temperature and strain rate-dependent buckling behaviors. The study provides a simple and efficient way to generate morphing structures using the designable buckling effect.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Hui Chen, Fanchun Li
Summary: A novel circular metamaterial structure with negative Poisson's ratio (NPR) was designed in this study, and its mechanical properties were compared with a cube NPR structure. The results demonstrated that the circular structure exhibited the characteristics of negative Poisson's ratio, and had a lighter weight and higher specific stiffness compared to the cube NPR structure.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Wanyu Lu, Hui Liu, Adnan Waqas, Lianchun Long
Summary: This paper systematically investigates the buckling behavior of multilayer pyramid lattice structures, finding that the critical buckling load is influenced by the unit cell size and total height of the structure. The buckling resistance increases with higher relative density. Varying the geometrical properties of the pyramid unit cell allows for the examination of different buckling modes.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
H. Reda, S. E. Alavi, M. Nasimsobhan, J. F. Ganghoffer
Summary: The proposed method presents a general homogenization approach that can be applied to a wide range of architected materials and composites prone to micropolar effects. It tackles the construction of effective Cosserat substitution media for heterogeneous materials, providing size-independent higher-order effective moduli.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Civil
Jun-zhi Liu, Shuxian Chen, Tak-Ming Chan
Summary: This paper presents a comprehensive study on the material properties and behavior of Q690 high strength steel welded T-sections. Experimental tests and numerical models were used to evaluate the cross-section slenderness limits and local buckling design provisions in different design codes. The results indicate that the current limits are generally accurate and safe, with EN 1993-1-12 and ANSI/AISC 360-16 providing more precise predictions compared to AS 4100, DSM, and CSM.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Weifu Sun, Tingting Zhu, Pengwan Chen, Gaojian Lin
Summary: The dynamic stability of submerged cylindrical shells subjected to underwater explosion was investigated in this work, revealing the effects of initial hydrostatic pressure and fluid-structure interaction. Critical threshold values were obtained through numerical simulations and theoretical modeling, showing that the vibrations are stable below this threshold.
THIN-WALLED STRUCTURES
(2022)
Article
Polymer Science
Yaru Sun, Pingping Yang, Weifu Sun
Summary: In this study, the addition of kaolinite into an intumescent flame retardant was found to enhance the thermal stability, mechanical properties, and flame retardancy of intumescent flame retarded polyurea composites. The results showed that the composite with 1.0 wt% kaolinite exhibited improved flame retardance, reduced time to flame out, and decreased total heat release. The tensile strength and elongation at break were also enhanced compared to the composite without kaolinite.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Chemistry, Physical
Zhipeng Zhou, Nan Zheng, Weifu Sun
Summary: In this work, the interlaminar fracture toughness of carbon fiber reinforced epoxy composites has been enhanced by the self-interlocked network arisen from Ti3C2Tx/polyvinyl alcohol aerogel. The results show that the surface-modified MXene effectively improved the mechanical properties of the aerogels. The enhanced fracture toughness can be attributed to cohesive failure at the interface facilitated by stitching-like effect of the aerogel, deflection and twisting of the main crack, and the generation of numerous microcracks.
Article
Engineering, Mechanical
Hang Zhang, Pengwan Chen, Zhiyuan Zhang, Gaojian Lin, Weifu Sun
Summary: This study investigates the energy absorption performance of corrugated wall metamaterials and its relationship with structure factors, wall thickness, and gradient design using finite element simulations, quasi-static compression tests and dynamic plate-impact tests. The results demonstrate that gradient design can enhance the negative Poisson's ratio and energy absorption efficiency, and that corrugated gradient structures exhibit better energy dissipation performance.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Yunchen Suo, Ning Luo, Yabo Chai, Haohao Zhang, Cheng Zhai, Weifu Sun
Summary: This study investigated the influence of the combined loading of coal seams and strata on coalbed methane (CBM) development in deep resource exploitation. Dynamic performance and energy changes of coal-sandstone combination and sandstone-coal combination were studied using a 50 mm split Hopkinson pressure bar (SHPB) and high-speed photographic equipment. The results showed polynomial relationships between dynamic compressive strength, failure strains, and increasing strain rates for both combinations. The initial damage fractures occurred at different locations for the two combinations. The improved constitutive model based on the ZWT was consistent with the experimental results and can play an effective and practical role in CBM development under complex ground conditions.
Article
Energy & Fuels
Dafang Li, Yangchaoyue Chen, Lihe Liu, Weifu Sun, Cheng Wang
Summary: In-situ methane explosive fracturing technology shows promise in exploiting shale gas as an alternative to hydraulic fracturing. The use of aluminum (Al) and potassium permanganate (KMnO4) powders as combustion improvers can enhance explosion overpressure in CH4-O2-N2 mixtures. The improvement mechanisms of Al and KMnO4 have been discussed, indicating that they can enhance explosion overpressure but not the detonation speed of methane.
Article
Materials Science, Multidisciplinary
Jun Jiang, Weifu Sun, Ning Luo, Pengwan Chen
Summary: The present study investigates the microscopic deformation mechanism and tensile properties of Al0.1CoCrFeNi nano-crystalline high-entropy alloys (HEAs) during uniaxial tension. Molecular dynamics simulation is used to explore the relationship between mechanical properties, grain size, and strain rate. The results show that as the tensile strain increases, the atoms undergo phase transformation and the dislocation density increases. The study also reveals that strain rate influences the Hall-Petch relation and the amorphization of atoms plays a significant role in HEAs' plastic deformation at high strain rates.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Civil
Hang Zhang, Gaojian Lin, Weifu Sun
Summary: A novel corrugated 3D lattice metamaterial with stable mechanical response and deformation behavior was constructed through geometric tailoring. The effects of cell number, scaling factor, and gradient design methods on the energy absorption performance were systematically studied. The results show that the proposed corrugated lattice has stable mechanical response and ideal energy absorption performance due to its stable deformation behavior.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Composites
Mengqing Yang, Weifu Sun, Weiguo Li
Summary: Based on considering the combined influence of stress concentration, residual thermal stress, and thermo-physical properties of the matrix, an analytical model of temperature-dependent transverse strength is proposed. The model is validated through comparison with previous models and experimental results. The study also analyzes the important factors, such as stress concentration and residual thermal stress, on the transverse strength. This research provides a reliable approach to predicting the transverse strength of composites in high-temperature environments and has implications for secure assessment.
COMPOSITES COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Jun Jiang, Weifu Sun, Ning Luo
Summary: Molecular dynamic simulations were used to study the contact behavior, microstructure evolution, and sintering mechanism of Al-Ni dissimilar nanoparticles under high-velocity impact. It was found that the simulated results deviated from the predicted results of the Hertz model as the impact velocity increased. Under high-velocity impact, the sintering process was dominated by the dislocation slip of Ni nanospheres and the atomic diffusion of Al nanospheres.
Article
Materials Science, Composites
Gaojian Lin, Tian Zhou, Zhipeng Zhou, Weifu Sun
Summary: In this study, multi-functional basalt fiber composites were fabricated by embedding LIG film obtained from double-sided etching PI paper into basalt fiber laminates. The effects of LIG film insertion on fracture toughness and impact resistance of the laminates were investigated. The results showed that the laminates with LIG inserted maintained their original mechanical properties, while exhibiting improved conductivity and electromagnetic shielding performance.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Weifu Sun, Tingting Zhu, Yinan Qiu, Gaojian Lin
Summary: This paper investigates the prediction of the buckling strength of stiffened cylindrical shells based on the non-destructive probing technique. Finite element simulations are used to determine the proper probing location with respect to the stiffener. Lateral probing experiments are conducted to validate the simulation results. It is found that the height of the stiffener and the probing location are two important factors affecting the accuracy of the buckling load prediction.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Chemistry, Physical
Wen-Yu Hu, Ke-Xin Yu, Qi-Na Zheng, Qi-Liang Hu, Cheng-Fei Cao, Kun Cao, Weifu Sun, Jie-Feng Gao, Yongqian Shi, Pingan Song, Long-Cheng Tang
Summary: An intelligent fire warning material based on montmorillonite has been developed, which shows excellent cyclic warning performance and reliable flame retardancy.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Construction & Building Technology
Yabo Chai, Ning Luo, Haohao Zhang, Yujie Duan, Gongyu Mou, Weifu Sun, Jiwei Dong
Summary: Accelerating the dismantling of high-carbon and high-pollution thin-walled cylinder structures, such as chimneys, is crucial in achieving carbon neutrality. The successful demolition of a 183 m ultra-high coaxial thin-walled steel-inner-cylinder reinforced concrete chimney (UCTS-RCC) was accomplished through controlled blasting demolition technology. The stability of the steel inner cylinder (SIC) and the cutting effect were verified through theoretical analysis, FEM statics analysis, cutting experiments, and LS-DYNA simulations. The synchronous collapse of SIC and RCC was achieved with a reasonable ignition delay time setting. The blasting scheme and rationality verification methods used in this project provide valuable reference for similar ultra-high thin-walled cylinder complex structural chimneys.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Gaojian Lin, Wenpeng Gao, Pengwan Chen, Weifu Sun, Sergei A. Chizhik, Alexander A. Makhaniok, Galina B. Melnikova, Tatiana A. Kuznetsova
Summary: In this work, molecular dynamics simulations were conducted to investigate the nanoindentation behavior of bilayer composite nanofilms composed of metal Ag and polymer PMMA. The effects of Ag and PMMA thickness on the elastic moduli of the films were analyzed, revealing that the Hertz model is applicable up to a maximum penetration depth of approximately 6 Å. Increasing Ag thickness led to a transition in the deformation mode from bending to indentation, resulting in improved composite film elastic modulus. The introduction of a PMMA layer hindered the development of dislocations in the Ag layer and enhanced the elastic limit of the composite films. This study serves as an important foundation for experimentally determining the overall elastic modulus of metal/polymer composite films using nanoindentation or extracting the elastic modulus of the metal film from the indentation response of the composite film.
NANOSCALE ADVANCES
(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)
