Article
Materials Science, Composites
Manuel George, Mattipally Prasad, Rajeshkumar Selvaraj, N. Sakthieswaran, J. Sivakumar, Amal M. Al-Mohaimeed, Tse-Wei Chen, Mohammed Al-Bahrani, Rey Y. Capangpangan, Arnold C. Alguno
Summary: In this study, the dynamic behavior of rotating CFRP composite tapered plates reinforced with graphene nanoparticles was investigated using finite element analysis. The mechanical properties of CFRP laminates containing different wt% of graphene were evaluated using ASTM standard tests. A first-order shear deformation theory (FSDT) based finite element model was developed to analyze the natural frequencies of the graphene reinforced CFRP plates. Experimental dynamic analysis was also conducted on the composites. Parametric analysis was performed to study the influence of various factors on the dynamic responses of the CFRP plates.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Physical
Serkan Erdem, Fatih Bulut, Mehmet Erbil Ozcan, Hasan Ogul, Yunus Onur Yildiz
Summary: In this study, the linear attenuation coefficients of doped carbon fiber-reinforced epoxy composites (Boron Oxide (B2O3), Lead Monoxide (PbO), and Zinc Borate (2ZnO 3B2O3 3H2O)) for gamma radiation were investigated using the HPGe detector. The composites with different proportions of additive materials (10, 20, and 30 wt%) were prepared to analyze the impact of additive amount on radiation shielding. The specimens were tested at 7 different energy levels, and the effect of additive materials on mechanical properties was also examined. The findings showed that all additives improved gamma attenuation ability, with the best shielding characteristic observed in the case of 30 wt% Lead Monoxide sample. Additionally, 10 wt% additive materials provided increased stiffness compared to undoped samples.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Pabitra Maji, Mrutyunjay Rout, Amit Karmakar
Summary: In this study, an eight-nodded isoparametric finite element method was used to model the geometry of the stiffened plate based on first-order shear deformation theory. The distribution of carbon nanotubes, as well as various factors such as stiffeners addition, dimensions, aspect ratio, thickness ratio, boundary conditions, fiber volume fraction, and temperature, were analyzed for their effects on the natural frequency.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Peng Guo, Qi-zheng Zhou, Zi-yin Luo
Summary: This study investigates the low-frequency vibro-acoustic characteristics of a finite locally resonant (LR) plate and explores the influence of parameters and number of additional resonators on its performance. The experimental results validate the theoretical analysis, showing that finite LR plates can potentially attenuate low-frequency vibration and noise.
Article
Engineering, Manufacturing
Zhihe Yang, Zeshi Yang, Hui Chen, Wentao Yan
Summary: Material extrusion is a promising method for manufacturing short fiber reinforced composites. This paper investigates the fiber breakage and orientation change during the process and develops a simplified CFD model to understand the experimental phenomena. The results show that nozzle diameter and layer height have significant effects on fiber breakage and mechanical properties.
ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Physical
Qi Wu, Wenjun Li, Chang Liu, Yawei Xu, Guoguang Li, Hongxing Zhang, Jinyin Huang, Jianyin Miao
Summary: This study presents a method to enhance the thermal conductivity of elastomeric thermal interface materials (TIMs) for spacecraft by incorporating mesophase pitch-based carbon fibers (CFs) and utilizing a strong magnetic field for fiber alignment. The resultant composite shows significantly improved through-plane thermal conductivity compared to traditional alumina/silicone rubber composites and meets the vacuum outgassing performance standard for spacecraft. Ground and on-orbit tests confirm its excellent heat transfer capability in both environments.
Article
Mechanics
Bhupesh Kumar Chandrakar, N. K. Jain, Ankur Gupta
Summary: Non-linear vibrations in a cracked orthotropic plate with non-uniform thickness are studied analytically, considering the effect of fiber orientation. The governing equation for the tapered orthotropic plate is derived, incorporating the modified couple stress theory and the effect of partial crack. The results show that the vibration characteristics of the cracked orthotropic plate are influenced by the taper parameters and fiber direction.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Materials Science, Composites
Vinyas Mahesh
Summary: This study presents the experimental results of modal analysis of additive manufactured PETG-based composites reinforced with short carbon fibers and OMMT nanoclay. The effects of reinforcing materials on natural frequencies and damping factors were investigated by varying their weight percentages, showing that boundary conditions and weight percentage play vital roles in determining the frequency and damping parameters of the composite beam.
POLYMER COMPOSITES
(2021)
Article
Multidisciplinary Sciences
Ivana Kovacic, Zeljko Kanovic
Summary: This study utilizes a harmonic excitation on a metal plate to visualize vibration modes using scattered grains and a camera, and measures the responses using an accelerometer and a microphone. The symmetry between vibration and acoustic responses is shown to be an identifier for pattern recognition.
Article
Mechanics
Yegao Qu, Fangtao Xie, Heng Su, Guang Meng
Summary: This paper develops a numerical model for predicting the nonlinear structural and acoustic responses of a composite laminated plate induced by stick-slip motions. The model incorporates a higher-order shear deformation theory and a macro-slip friction model. It finds that periodic distortions in sound pressure waves are mainly due to stick-to-slip transitions. The effects of preload, friction coefficient, and boundary stiffness on the responses are examined.
COMPOSITE STRUCTURES
(2021)
Article
Polymer Science
Mostafa Katouzian, Sorin Vlase
Summary: The homogenization theory is utilized to analyze the creep behavior of composite materials reinforced with fibers, predict time response under load using mechanical constants. Experimental results show good agreement with theoretical predictions.
Article
Construction & Building Technology
Qiang Fu, Zhiming Zhou, Zhenhua Wang, Jie Huang, Ditao Niu
Summary: The addition of carbon nanotubes (CNTs) and carbon fibers (CFs) can enhance the dynamic compressive strength of concrete. The combination of CNTs and CFs has a better effect on improving the strain-rate effect of the concrete. The addition of CNTs improves the porosity and enhances the dynamic compressive strength, while the addition of CFs increases the porosity but still enhances the strength.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Clinical Neurology
Christopher Alvarez-Breckenridge, Romulo de Almeida, Ali Haider, Matthew Muir, Justin Bird, Robert North, Laurence Rhines, Claudio Tatsui
Summary: This retrospective study evaluated the advantages of carbon-fiber reinforced polyetheretherketone (CFRP) pedicle screws in the management of spinal tumors. The results showed that CFRP pedicle screws provided effective spinal stabilization and improved postoperative imaging, facilitating radiation planning and detection of local recurrence.
Article
Acoustics
Hossein Amirabadi, Hassan Afshari, Arashk Darakhsh, Mirsalman Sarafraz
Summary: This study investigates the dynamics of cantilever trapezoidal plates with non-uniform thickness and enriched with carbon nanotubes (CNTs) or graphene nanoplatelets (GNPs). Mathematical modeling and calculations are performed to examine the behavior of the plates. The results show that distributing the nanofillers closer to the clamped edge and reducing their volume fraction from the clamped edge to the outer free edge is more effective in achieving higher natural frequencies in the low vibrational modes.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Zhonglong Wang, Yinghou Jiao, Zhaobo Chen, Xiuquan Qu, Tao Fu
Summary: The study focuses on the average sound radiation efficiency of a rotating annular plate under transverse load in a rotating coordinate system. The governing equation is solved using Galerkin's Method, and the sound radiation efficiency is derived based on Rayleigh integral. Experimental verification and boundary element method simulation are conducted to validate the results. The study shows that rotating speed, geometry parameters, material parameter, and boundary conditions all affect the sound radiation efficiency of the plate. Results indicate an increase in efficiency with higher rotating speeds and a decrease in efficiency with lower thickness in different frequency ranges.
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)
