Article
Instruments & Instrumentation
Julio Gabriel de Falco Manuel, Antonio Jose Faria Bombard, Eric R. Weeks
Summary: Magnetorheological fluids (MRFs) are smart materials with great versatility in mechanical and mechatronic systems. This study analyzed the influence of particle size distribution on the maximum packing fraction, on-state yield stress, and off-state viscosity of concentrated MRF through experiments and simulations.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Yu Tong, Penghui Zhao, Xiaoguang Li, Ning Ma, Xufeng Dong, Chenguang Niu, Zhanjun Wu, Min Qi
Summary: In this study, a new type of magnetorheological fluid (MRF) was prepared by mixing an ionic liquid (IL) with silicone oil (SO). The experimental results showed that the MRF exhibited better sedimentation stability compared to MRFs based on pure SO or pure IL. The shear yield stress of the MRF was determined using three different methods, and it was found that the MRF with the IL/SO mixture achieved a higher shear yield stress. This research provides new insights for improving the performance of MRFs.
INTERNATIONAL JOURNAL OF SMART AND NANO MATERIALS
(2022)
Article
Instruments & Instrumentation
Ramesh Upadhyay, Seung-Bok Choi
Summary: The proposed rheological model successfully predicts static and dynamic yield stress values in magnetorheological fluids, providing valuable insights into the dissipation process in a shear MR fluid.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Instruments & Instrumentation
Cheng Qian, Yebing Tian, Zenghua Fan, Zhiguang Sun, Zhen Ma
Summary: The novel magnetorheological shear thickening polishing fluids (MRSTPFs) were developed by mixing micro cubic boron nitride (CBN) abrasive particles into traditional magnetorheological shear thickening fluids. The rheological characteristics of the MRSTPFs were investigated under different magnetic flux densities. It was found that both the particle size optimization of ferromagnetic phase and the increased magnetic flux density played important roles in enhancing the shear thickening effect. The investigation of rheological characteristics demonstrated that MRSTPFs could enhance polishing performance, contributing to developing a high-efficiency and ultra-precision polishing process.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Instruments & Instrumentation
Irfan Bahiuddin, Fitrian Imaduddin, Saiful Amri Mazlan, Mohd Ibrahim Shapiai, Ubaidillah, Nurhazimah Nazmi, Norzilawati Mohamad
Summary: This paper presents an inverse model of magnetorheological suspensions using feedforward neural network model, showing successful prediction of suspension compositions with good agreement with experimental data through machine learning approaches.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Yongsok Seo
Summary: A magnetorheological (MR) slurry is developed as a completely different concept from the MR suspension, and it exhibits unprecedented ultra-high yield stress and permanent stability. This breakthrough is expected to expand the application of MR fluids to diverse industries. Additionally, a simple fitting equation for the yield stress as a function of the particle volume fraction is proposed.
Article
Chemistry, Physical
Haopeng Li, Fei Chen, Mengmeng Han, Aimin Li, Zuzhi Tian, Xiangfan Wu
Summary: This study investigates the properties of magnetorheological fluids at high temperatures and prepares a novel magnetorheological fluid for high temperatures. The results show that the novel fluid exhibits good sedimentation stability, viscosity, and shear yield stress at high temperatures.
Article
Chemistry, Physical
Izabell Craciunescu, Elena Chitanu, Mirela M. Codescu, N. Iacob, A. Kuncser, V. Kuncser, V. Socoliuc, Daniela Susan-Resiga, Florica Balanean, G. Ispas, Tunde Borbath, I. Borbath, Rodica Turcu, L. Vekas
Summary: High magnetization Fe3O4/OA-FeCo/Al2O3 nanocomposite magnetic clusters were successfully synthesized via a modified oil-in-water miniemulsion method. These clusters, with a combination of magnetite nanoparticles and FeCo/Al2O3 particles, exhibited enhanced magnetic and flow properties in ferrofluid carrier. The unique structure and composition of the Fe3O4/OA-FeCo/Al2O3 clusters contribute to their promising performance as a new type of nanocomposite magnetorheological fluid, as demonstrated by advanced characterization techniques.
Article
Materials Science, Multidisciplinary
Miao Xu, Kaili Zhang, Yanli Yang, Tiexin Cheng, Guangdong Zhou
Summary: This study reports composite additives that enhance the yield stress, sedimentation stability, and long-term reversibility of bidisperse magnetorheological fluids. By introducing magnetic Fe3O4/halloysite-nanotube (HNT) composite additives, the magnetic dipole-dipole interactions between particles are enhanced, strengthening the rigidity of the magnetic chains and increasing the yield stress of the fluid. The additives also prevent particle aggregation, improve sedimentation stability, and enhance the fluid's response speed and long-term reversibility.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Vinay Vaibhav, Juergen Horbach, Pinaki Chaudhuri
Summary: Using numerical simulations, this study examines the flow behavior of a model glass-forming binary mixture with large particle size ratio. The research focuses on the rheological response to applied shear in the regime where the larger species dominate spatially. The study shows that as density increases, macroscopic rigidity emerges in the regime where the larger species undergo glass transition while the smaller species remain highly diffusive. The analysis reveals the interplay between shear timescale and quiescent relaxation dynamics of the two species, offering microscopic insights into the observed rheological response. Additionally, by adjusting the composition of the mixture, the study demonstrates that the systematic insertion of smaller particles affects the rheology by reducing system viscosity.
Article
Physics, Multidisciplinary
Farshad Nazari, Kourosh Shoele, Hadi Mohammadigoushki
Summary: We present a study on the locomotion of a helical swimmer in yield stress fluids, which involves three stages. In the first stage, the swimmer needs to overcome the yield strain of the material to achieve rotational motion. However, surpassing the first threshold alone does not lead to locomotion. Only when the viscous forces are strong enough to cause plastic deformation of the material, resulting in movement away from the swimmer, can net locomotion occur. In the third stage of locomotion, the yield stress affects swimming differently at small and large pitch angles, retarding or enhancing the swimming speed respectively. Flow visualizations demonstrate highly localized flow near the swimmer in yield stress fluids.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Tianxiang Du, Penghui Zhao, Yitong Liu, Ning Ma, Xufeng Dong, Hao Huang
Summary: This study demonstrates the use of high saturation magnetization nanoparticles as a second component in MR fluids to balance the constraints relationship among various key performances. By incorporating nanoparticles into micron particles, the performance of the MR fluids is effectively enhanced. The optimal content of nanoparticles is determined, resulting in improved dynamic yield strength, sedimentation stability, and zero-field viscosity. The simple preparation method adds significant engineering application value to these MR fluids.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Chemical
H. Khajehsaeid, N. Alaghehband, P. K. Bavil
Summary: Magnetorheological fluids (MRFs) are functional materials that exhibit magneto-mechanical coupling, transitioning from free-flowing to semi-solid state under a magnetic field. The yield stress, dependent on magnetic field intensity and particle volume fraction, is crucial for MR device design. Experimental and theoretical investigations have shown that an empirical model can accurately describe the yield stress of MRFs, considering different particle concentrations. A modified magnetic dipole model with an exponential distribution function shows promising results for capturing particle chain arrangements in MRFs under a magnetic field.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Yu Tong, Xiaoguang Li, Penghui Zhao, Xufeng Dong, Zhanjun Wu, Min Qi
Summary: This study investigated the influence of interface between particles and carrier fluids on the performance of MRF by preparing two different CIP magnetorheological fluids using ionic liquids and silicone oils. Results showed that MRF based on ionic liquids exhibited higher shear yield strength and more significant MR effect in higher magnetic field strength, with a possible explanation proposed and supported by experimental data analysis.
FRONTIERS IN MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ashok Kumar Kariganaur, Hemantha Kumar, M. Arun
Summary: This study investigates the feasibility and performance of synthesizing magnetorheological fluids using carbonyl iron particles, and examines the effects of different oils and additives on the fluid's characteristics. The sedimentation stability and yield behavior of various samples are characterized, and MRF-1 and MRF-7 are selected for further study on their dynamic performance in magnetorheological dampers. The results show significant changes in damping force and dynamic range under certain conditions.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
N. Golinelli, A. Spaggiari, D. Castagnetti, L. Fornari, E. Dragoni, G. Gualdi, A. Brunazzi
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2019)
Article
Engineering, Mechanical
A. Spaggiari, F. Denti
Summary: The combination of fused deposition molding with polymeric materials and structural adhesive aims to enhance adhesive performance and overcome the limitations of 3D printing. Experimental results show that adhesive bonding does not weaken the load carrying capacity and stiffness of joints, and surface morphology has minimal impact on system performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Mechanical
Luke Mizzi, Enrico Salvati, Andrea Spaggiari, Jin-Chong Tan, Alexander M. Korsunsky
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Article
Instruments & Instrumentation
Luke Mizzi, Andrea Spaggiari, Eugenio Dragoni
SMART MATERIALS AND STRUCTURES
(2020)
Article
Instruments & Instrumentation
Luke Mizzi, Andrea Spaggiari
SMART MATERIALS AND STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
Andrea Spaggiari, Alberto Bellelli
Summary: This study analyzed the shear behavior of magnetorheological elastomers (MRE) and found a strong correlation between the weight fraction of ferromagnetic material and mechanical behavior. The dissipated energy of MRE decreases when the magnetic field stiffens the behavior or the shear rate increases. Furthermore, the external magnetic field significantly increases the ultimate failure shear stress of MRE.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Luke Mizzi, Enrico Salvati, Andrea Spaggiari, Jin-Chong Tan, Alexander M. Korsunsky
APPLIED MATERIALS TODAY
(2020)
Article
Instruments & Instrumentation
A. Sorrentino, D. Castagnetti, L. Mizzi, A. Spaggiari
Summary: Rotating squares auxetic metamaterials with a negative Poisson's ratio can be improved by using an innovative variable arcs fillet solution. Through FE modeling, it was determined that a combined elliptical and circular arc fillet configuration can achieve an overall 3% elastic strain with a PR of approximately -1. Experimental results from a tensile test on a 3D printed prototype of the optimal solution demonstrated excellent agreement with FE predictions, showing a PR of ca. -1 up to a 3% overall strain.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Luke Mizzi, Andrea Spaggiari
Summary: This study introduces a new class of chiral metamaterials based on uniform Euclidean tessellations, with most of them possessing negative Poisson's ratio. The relationship between geometric parameters and mechanical properties was investigated, showing the transformative ability of chirality in complex geometries.
MECHANICS OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jorge de-J. Lozoya-Santos, Juan C. Tudon-Martinez, Ruben Morales-Menendez, Olivier Sename, Andrea Spaggiari, Ricardo Ramirez-Mendoza
Summary: A methodology for designing mathematical models for shock absorbers is proposed, guided by characteristic diagrams. These diagrams can be easily constructed from experimental data and classified into seven patterns for model design. The identification of the mathematical model using conventional algorithms has led to highly accurate nonlinear models for magneto-rheological dampers.
FRONTIERS IN MATERIALS
(2021)
Article
Engineering, Chemical
M. Ragni, D. Castagnetti, A. Spaggiari, E. Dragoni, M. Milelli, S. Girlando, P. Borghi
Summary: This research focuses on the shear strength of metal-elastomer bonded joints, which is influenced by manufacturing parameters and working temperature. Through experimental tests, the study identifies the parameters that most affect the shear strength of the joint, helping designers maximize the load-carrying capacity of the joint.
JOURNAL OF ADHESION
(2022)
Article
Engineering, Mechanical
Luke Mizzi, Andrea Sorrentino, Andrea Spaggiari, Davide Castagnetti
Summary: This study used Finite Element Analysis to investigate the impact of ligaments on rotating unit systems, finding that ligaments have a profound influence on most mechanical properties and off-axis loading behavior, leading to increased anisotropy and reduced stiffness levels in systems with ligaments.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Mechanical
Giovanni Meneghetti, Alberto Campagnolo, Alberto Visentin, Massimiliano Avalle, Matteo Benedetti, Andrea Bighelli, Davide Castagnetti, Andrea Chiocca, Luca Collini, Massimiliano De Agostinis, Alessandro De Luca, Eugenio Dragoni, Stefano Fini, Vigilio Fontanari, Francesco Frendo, Alessandro Greco, Giuseppe Marannano, Fabrizio Moroni, Antonio Pantano, Alessandro Pirondi, Alessandro Rebora, Alessandro Scattina, Raffaele Sepe, Andrea Spaggiari, Bernardo Zuccarello
Summary: This paper presents a Round Robin study among eleven Italian Universities to calibrate the peak stress method (PSM) using seven different commercial FE software packages. The study found that most of the FE software packages had similar PSM parameter values, with the main source of discrepancy being the stress extrapolation method at FE nodes.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Luke Mizzi, Andrea Spaggiari
Summary: This study provides a numerical analysis of stress concentration factor in an elastic solid with nonaligned and non-concurrent circular holes under internal pressure. The research indicates that geometric configurations and loading conditions have an impact on stress concentration, and empirical models are established to predict the factor for system designers.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Mechanics
Luke Mizzi, Andrea Spaggiari
Summary: This study investigates the impact of introducing geometric chiral characteristics on the mechanical properties of Euclidean polygonal tessellations with octahedral or dodecahedral elements. The research discovers three novel auxetic metamaterials with potentially large negative Poisson's ratios and high in-plane isotropy. It further demonstrates the control of auxeticity through tuning the geometric parameters. This work highlights the potential of Euclidean polygonal tessellations in designing innovative auxetic metamaterials and provides insights into the deformation mechanisms and geometric conditions that lead to this anomalous property.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
