Article
Chemistry, Physical
Y. T. Singh, P. K. Patra, Nguyen N. Hieu, D. P. Rai
Summary: In this study, the electronic and mechanical properties of Boron (B) doped (6,1) SWCNT in zigzag and armchair pattern were investigated using Density Functional Theory (DFT) and ab initio Molecular Dynamics (MD) simulations. The DFT calculations revealed the dependence of the SWCNT's electronic properties on the doping pattern and concentration. Additionally, the mechanical response of the SWCNT tube varied significantly with different dopant concentrations and doping patterns.
SURFACES AND INTERFACES
(2022)
Article
Biochemical Research Methods
Y. T. Singh, P. K. Patra, K. O. Obodo, M. Musa Saad H.E, D. P. Rai
Summary: In this paper, the electronic and mechanical properties of Nitrogen-doped carbon nanotubes were studied using first principles calculations. It was found that the doping pattern and concentration have significant effects on the electronic and mechanical properties of the nanotubes.
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
(2022)
Article
Polymer Science
Ferran Serra-Parareda, Fabiola Vilaseca, Roberto Aguado, Francesc X. Espinach, Quim Tarres, Marc Delgado-Aguilar
Summary: The study estimated the Young's modulus of henequen fibers in PP-based composites through micromechanical modeling and single filament tensile testing, confirming the potential of henequen fibers as reinforcement for PP. Adding 4% of maleic anhydride grafted polypropylene improved interfacial adhesion and increased the composite's Young's modulus up to 6.4 GPa at 50 wt.% fiber content. Henequen fibers exhibited a comparable stiffening capacity to glass fibers, and established models predicted intrinsic Young's modulus values of 30.5 and 34.6 GPa, with a corrected modulus of 33.3 GPa from filament testing.
Article
Materials Science, Multidisciplinary
Simon Vitzthum, Joana Rebelo Kornmeier, Michael Hofmann, Maximilian Gruber, Emad Maawad, Antonio C. Batista, Christoph Hartmann, Wolfram Volk
Summary: This paper presents an experimental setup for the microscopic analysis of the thermoelastic effect and conducts in-situ diffraction experiments on low carbon steel. The results validate the relationship between the thermoelastic effect and the onset of yielding, demonstrating the effectiveness of temperature-based determination method in material characterization and showcasing the usefulness of temperature elasticity parameters.
MATERIALS & DESIGN
(2022)
Article
Engineering, Chemical
Md. Imran H. Khan, Nishane Patel, Md Mahiuddin, M. A. Karim
Summary: This research aims to investigate the micro-level mechanical properties of plant-based food materials (PBFM) during drying and establish relationships between the elastic modulus, hardness, and stiffness and the moisture content. The study found that the mechanical properties of PBFM remained steady in early stages of drying, but significantly increased in later stages, establishing essential relationships with moisture content during drying.
JOURNAL OF FOOD ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Michael Schwaighofer, Luis Zelaya-Lainez, Markus Koenigsberger, Markus Lukacevic, Sebastian Serna-Loaiza, Michael Harasek, Olaf Lahayne, Valentin Senk, Josef Fuessl
Summary: Lignin, a by-product of the pulp and papermaking industry, has potential for development as renewable materials. However, its mechanical properties and dependence on extraction process and feedstock are unknown. This study tested five different lignins extracted using different processes and feedstocks. Evaluation and microstructure analysis showed reliable indentation properties of the porous lignins, and micromechanics homogenization theory revealed the similar mechanical properties of solid lignin in all samples, regardless of chemical structure, with a Young's modulus of 7.1 GPa.
MATERIALS & DESIGN
(2023)
Article
Mechanics
Keivan Kiani, Krzysztof Kamil Zur
Summary: In this study, suitable surface energy-nonlocal-integral and differential models were reported for investigating the mechanical behavior of a nanosystem consisting of double parallel nanorods with defects. By evaluating nonlocal-surface energy-based modes and implementing the Galerkin method, the capabilities of capturing the natural frequencies of the defected nanosystem were revealed. The roles of nonlocality, surface energy, nanorod characteristics, defect properties, and elastic interface layer constant on free vibration were explained.
COMPOSITE STRUCTURES
(2021)
Article
Critical Care Medicine
Qiancheng Xu, Banghong Qiang, Youjun Pan, Juan Li, Lei Zha, Weihua Lu, Junli Wang, Jianguo Li
Summary: This study aimed to diagnose acute kidney injury (AKI) by evaluating renal stiffness using shear wave elastography. In study A, sepsis-associated AKI was found to significantly increase kidney Young's modulus (YM). In study B, the renal stiffness was higher in AKI patients and increased with the severity of injury. However, shear wave elastography did not show advantages over NGAL and KIM-1 in diagnosing AKI.
Article
Materials Science, Multidisciplinary
Jeong-Gyun Kim, Dongseok Suh, Haeyong Kang
Summary: Twist-spun carbon nanotube (CNT) yarns consist of numerous CNTs and their bundles which have entangled and twisted structures. While individual CNTs have high mechanical strength, CNT yarns are flexible and can change shape, making them suitable for wearable device design. By adjusting the geometrical structure, a wide range of Young's modulus can be achieved, allowing for various applications requiring different stresses.
CURRENT APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Valentin A. Gorodtsov, Valentin G. Tkachenko, Dmitry S. Lisovenko
Summary: This study conducted theoretical and numerical analyses on the extreme values of Young's modulus for six and seven-constant tetragonal crystals based on experimental data, revealing their relationship with anisotropy coefficients and characteristics in different crystal structures.
MECHANICS OF MATERIALS
(2021)
Article
Crystallography
Valentin A. Gorodtsov, Dmitry S. Lisovenko
Summary: This study explores the extreme values of Young's modulus for rhombic crystals and reveals the differences in mechanical properties between different crystal types. Rhombic crystals exhibit significant variations in Young's modulus values, while cubic, tetragonal, and hexagonal crystals display greater rigidity. Furthermore, a classification scheme based on dimensionless parameters is presented for the Young's modulus of rhombic crystals.
Article
Engineering, Multidisciplinary
Zhu XiaoWu, Li Li
Summary: This study demonstrates how both cross-sectional nonlocal interactions and axial nonlocality affect the tensile behaviors of nanobars. When the length-to-height ratio is small, nonlocal interactions become significant, while in slender bars, the main nonlocal effect stems from the nonlocal cross-sectional effect. Overcoming the ill-posed problem of pure nonlocal integral elasticity can be achieved by employing both pure nonlocal integral elasticity and surface elasticity.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Environmental Sciences
Z. Wu, A. K. Leung, D. Boldrin, S. P. Ganesan
Summary: The variability in biomechanical properties of vetiver roots was mainly influenced by root water content, especially in fine roots. Testing hydrated roots may underestimate strength but overestimate root ductility and underestimate the time of slope failure when considering slope stability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Chemical
Joelle Nader, Jean Claude Assaf, Esperance Debs, Nicolas Louka
Summary: This study introduces a novel method to measure the elasticity in non-uniform products such as peanuts. The results showed that the elasticity of peanuts was mainly influenced by the water content. The proposed method is valuable for quality assessment in the food industry.
Article
Construction & Building Technology
Philippe Poullain, Mircea Barnaure, Stephanie Bonnet
Summary: Mechanical property data for earthen materials are limited, and usually only average values are available. This study investigates the mechanical properties of cob, including tensile and compressive strength and Young's modulus. The results show significant variation in the properties, and the calculation method used greatly affects the modulus values.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Mechanics
A. D. Lai, J. F. Jia, J. L. Qu, J. Y. Wang, J. B. Sun, Z. H. Zhou, X. S. Xu, C. W. Lim
Summary: This study investigates the influence of local thinning thickness defects on the buckling of cylindrical shells. A static buckling model is established based on the Hamiltonian system, and the complete symplectic eigensolutions are superimposed to derive the buckling modes of the cylindrical shell with defects. The influence of different defect shapes on the shell's buckling is analyzed by constraining the defect volume, and it is concluded that defects of exponential function are more harmful.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Aerospace
Baisheng Wu, Yixin Zhou, C. W. Lim, Huixiang Zhong
Summary: This paper proposes a new analytical approach for constructing approximate solutions to the elliptic Kepler equation. A high-accuracy initial approximation is established using the piecewise Pade ' approximation, and the Schroder method is applied to further improve its accuracy. In general, one Schroder iteration is sufficient to obtain a highly accurate approximate solution. The proposed approach is a direct method that requires only solving a cubic equation and evaluating two trigonometric functions. The accuracy and effectiveness of the approximate, analytical solutions are proved by comparing them with solutions obtained by other numerical procedures.
Article
Engineering, Mechanical
Yiwen Ni, Shengbo Zhu, Zhenzhen Tong, Xinsheng Xu, Zhenhuan Zhou, C. W. Lim, M. Ahmer Wadee, Stylianos Yiatros
Summary: An accurate nonlinear HTEE buckling analysis of piezoelectric fiber-reinforced composite cylindrical shells subjected to the coupled loading effects of axial compression and hydrostatic pressure was established, considering the nonuniform prebuckling effect. Nonlinear governing equations were derived based on higher-order shear deformation theory and Novozhilov's nonlinear shell theory. Accurate critical buckling stresses, pressures, and explicit buckling modes for both axisymmetric and nonaxisymmetric buckling were obtained through the Galerkin method. A comprehensive parametric study of geometric parameters, end conditions, distribution patterns, and hygrothermal-electric multiphysical fields on the buckling behavior of HTEE composite cylindrical shells was also conducted and discussed.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Jiabin Sun, Zhenhuan Zhou, Xueqing Cao, Qifeng Zhang, Qilin Zhang, Ziguang Jia, Wei Sun, Zhenzhen Tong, Xinsheng Xu, C. W. Lim
Summary: Pattern transformation in a periodic porous structure has led to the development of multifunctional mechanical metamaterials with negative Poisson's ratio. Inspired by this, a novel porous cylindrical shell is constructed with staggered openings, which can undergo controlled waist deformation under axial compression. This design shows potential for applications in biomedical engineering, underwater detection, and fluid machinery.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Acoustics
Guifeng Wang, Yuanting Wei, Zhenyu Chen, C. W. Lim
Summary: Due to their great application potential in programmable wave transportation, topological metamaterials have received significant research attention in recent decades. This article presents an acoustic metamaterial composed of a perforated nylon substrate and a ceiled air-flowing channel. The resonance frequency and topological phases of the metamaterial are tuned by filling the holes arranged in a honeycomb lattice with water. By adjusting the height of water columns, two subwavelength bandgaps are opened, leading to controllable bandgap and topological phase transitions. The study explores the dependence of topological protected interface mode frequency and quality factor on water height and proposes a design strategy to obtain high-quality topological protected interface mode at the desired frequency. Additionally, the article demonstrates topological rainbow trapping to terminate waves at different frequencies and locations. The controllable bandgap and topological protected interface mode enable the design of topological structures with simpler structures and lower cost.
Article
Thermodynamics
Guifeng Wang, Fan Shi, Zhenyu Chen, Yue Yu, C. W. Lim
Summary: The interest in phononic crystals and acoustic metamaterials has been a hot topic in recent years. This study proposes a prestressed metamaterial beam with actively tunable piezoelectric springs attached to multiple local resonators. The theoretical analysis of the system is conducted using the Euler-Bernoulli beam theory and Timoshenko beam theory. The dispersion relation and transmission ratio are analytically computed using the spectral element method, and excellent agreement with the benchmark is reported. The paper also investigates the influence of external axial force, resonator number, and mass on the bandgap range and attenuation behavior, and demonstrates the active control of bandgap range and frequency.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Civil
Chen Liang, Zhenyu Chen, Guifeng Wang, C. W. Lim
Summary: This study investigates the thermal vibration characteristics of sandwich cylindrical shells made of functionally graded materials (FGMs). The shells are modeled using the Kirchhoff-Love shell theory, accounting for porosity effects that vary with the mixing degree of constituent materials. The material properties are temperature-dependent and show graded variation along the thickness direction. Analytical solutions for the natural frequencies are determined and compared with numerical simulations and data from the open literature. The study comprehensively examines the effects of various parameters on the thermal vibration characteristics of the composite shell structures.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Construction & Building Technology
Wisal Ahmed, C. W. Lim
Summary: The employment of recycled aggregate concrete (RAC) for sustainable infrastructure development has gained special interest due to the emphasis on resource conservation and environmental protection. This experimental study investigates the effect of elevated temperatures on the residual properties of RAC strengthened with chopped basalt fiber (BF) and pozzolana slurry treated recycled concrete aggregate (TRCA). The findings show significant enhancement in residual properties and improved matrix quality of the modified recycled concrete prepared by combined utilization of BF and TRCA.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Physics, Applied
Guifeng Wang, Yanhong Guan, Zhenyu Chen, Xinsheng Xu, Zhenhuan Zhou, C. W. Lim
Summary: We design a new topological rainbow trapping device by introducing a topological protected interface mode (TPIM) into the prevailing gradient rainbow device. The dependence of bandgap region and group velocity on the reference foundation stiffness is investigated. We successfully predict and demonstrate TPIM using topological phase transition and Zak phase analysis. Furthermore, we quantitatively evaluate the advancement of topological rainbow devices in vibration amplification and broadband wave attenuation compared to the prevailing gradient device.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zoe Yaw, Weijian Zhou, C. W. Lim
Summary: In this paper, a piezoelectric-based elastic metasurface with hybrid shunting circuits is proposed for adaptive control of flexural waves. By tuning negative capacitance and inductance simultaneously, the metasurface achieves a phase shift ranging from 0-2 pi with high transmission. Compared to existing single shunting circuit designs, the proposed metasurface performs better. Analytical modeling and finite element analysis are conducted to study the transmission and phase shift of the metasurface. Numerical simulations demonstrate switchable functionalities of wave refraction and focusing at different working frequencies.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Astronomy & Astrophysics
Yixin Zhou, Baisheng Wu, C. W. Lim, Huixiang Zhong
Summary: This article introduces a homologous collapse process of a sphere with uniform density, which is used to model the formation of astronomical objects. By combining the Pade approximation and the Schroder formula, the authors construct an approximate analytical solution for the radius as a function of time. This method is a direct approach that only requires solving a cubic equation and evaluating three trigonometric functions, demonstrating higher accuracy and effectiveness compared to existing methods.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Engineering, Civil
Wisal Ahmed, C. W. Lim
Summary: Recycling of construction and demolition waste is an effective way for sustainable development, recycled concrete, and environmental protection. This study investigated a new strength enhancing approach by adding basalt fiber (BF) to improve the strength and fracture properties of recycled concrete. The experimental results showed that the addition of BF significantly increased the fracture energy, fracture toughness, flexural strength, and elastic modulus of recycled concrete. The digital image correlation analysis revealed a continuous spread of strain contours in the BF modified concrete, indicating higher strain values compared to the reference sample. Microstructure observation confirmed better concrete matrix quality and BF-cement matrix interaction, demonstrating the feasibility of the applied strength enhancing technique for high strength fiber reinforced recycled concrete.
Article
Engineering, Multidisciplinary
Guanghui Xia, Xiaofang Kang, C. W. Lim, Yunlin Liu, Dong Chen, Liping Tang, Tingting Han
Summary: Based on parametric excitation and real-life low-frequency vibration, this study investigates the steady-state response of a piezoelectric energy harvesting system composed of a cantilever beam with a tip mass and horizontal excitation at the fixed end. By utilizing Hamilton's principle, the nonlinear partial differential equation of the cantilever piezoelectric energy harvesting system with an additional tip mass is derived and analyzed. The Galerkin method is used to reduce the nonlinear partial differential equation to an electromechanical coupling system that governs the cantilever piezoelectric energy harvesting system with a tip mass under parametric excitation. The first-order resonance response of the harvesting system is studied using the method of multiple scales, and the influence of different impedance and tip mass on the system performance is summarized and concluded.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Construction & Building Technology
Wisal Ahmed, C. W. Lim
Summary: Fiber hybridization is an effective method to enhance the mechanical properties and durability of recycled concrete. However, previous research mainly focuses on the basic mechanical properties and neglects the multicriteria-based performance assessment. In this study, eleven mix formulations with different fiber combinations and mineral admixtures were evaluated and compared. The results showed that mix formulations with hybrid fibers had significant improvements in compressive strength, splitting tensile strength, and flexural strength. The freeze-thaw assessment indicated that using hybrid fibers together with mineral admixtures resulted in superior durability performance. Cost analysis revealed that certain mix formulations had a higher net cost increase. The multicriteria analysis demonstrated that the hybrid fiber-based mix formulations had the best performance score and ranking.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Anchen Ni, Zhifei Shi, Qingjuan Meng, C. W. Lim
Summary: This study proposes a novel shallow buried periodic in-filled pipe barrier for mitigating surface waves. Through complex dispersion analysis, numerical simulations, and lab-scale experiments, the effectiveness and robustness of the barrier in attenuating surface waves are verified. The energy dissipation induced by material damping and local resonance of in-filled pipes contribute to wave attenuation. The feasibility of these novel wave barriers for mitigating train-induced vibrations is also preliminarily verified.
ENGINEERING STRUCTURES
(2023)