Article
Engineering, Mechanical
X. W. Zhang, Q. M. Zhang, X. J. Ren
Summary: In this study, the dynamic compression and energy absorption behaviors of porous materials filled with MR fluid were theoretically investigated. The results showed that the two-layer model can predict the dynamic stress before circumferential failure of the specimen very well. The research also found that the energy dissipation due to the MR effect is insensitive to the strain rate, while the energy dissipation caused by viscous flowing and inertial effect increases linearly and quadratically with the increase of impact velocity, respectively.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Philip A. E. Murgatroyd, Kieran Routledge, Samantha Durdy, Michael W. Gaultois, T. Wesley Surta, Matthew S. Dyer, John B. Claridge, Stanislav N. Savvin, Denis Pelloquin, Sylvie Hebert, Jonathan Alaria
Summary: Magneto-caloric materials have the potential for environmentally friendly thermal management devices, but developing solid-state technology faces challenges in material selection and performance control. The study of compounds derived from the PbFCl structure reveals that the c/a parameter can be used as an accurate proxy to control magnetic transition, and chemical substitution allows tuning of Curie temperature over a broad temperature span.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Meysam Alinejad, Saeed Jafari Mehrabadi, Mohammad Mehdi Najafizadeh
Summary: This study analyzed the effects of magnetic field, porosity, and geometry on the natural frequency and loss factor of a conical shell made of smart porous materials. The study found that increasing the length, radius, and thickness ratios led to a decline in the natural frequency, while the loss factor and porosity coefficients increased.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Instruments & Instrumentation
Lei Pei, Zongqiang Ma, Dongjun Ma, Xiaofeng Shi, Hao Pan, Pei Wang, Xinglong Gong
Summary: This study investigated the rheological properties and magnetorheological mechanism of dry magnetorheological fluid (MRF) under different working modes. A novel simulation method was developed to systematically simulate the microstructures and mechanical properties of dry MRF in the redispersion process, shear mode, and valve mode. The results showed that dry MRF exhibited superior redispersion property and response time compared to liquid-based MRFs, and the mechanical behaviors in shear mode and valve mode were dominated by different interaction forces.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Construction & Building Technology
Hongfei Yue, Zhuxian Zhang, Sudong Hua, Yanan Gao, Sheng Cui, Yuntao Wang, Zheng Zhang, Huajun Zhu
Summary: This research developed a cement-based magneto-rheological (MR) fluid material to improve the buildability of 3D printed concrete (3DPC) through interventions at the print head, such as magnetic fields. The study found that the storage modulus and dynamic yield stress of the MR fluid dramatically increased with the magnetic field strength and EAFSP concentration. Additionally, after a time-limited magnetic sweep, the buildability of 3DPC was improved, possibly due to the presence of residual chain-like structures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jianqiang Yu, Xiaomin Dong, Tao Wang, Zhengmu Zhou, Yaqin Zhou
Summary: This paper introduces the damping characteristics of a linear magneto-rheological (MR) damper with dual controllable ducts, showcasing its capabilities through numerical and experimental analysis. The design of dual independent controllable ducts helps reduce the influence of viscous damping force and improve dynamic range. By controlling the current of two independent coils, the pressure drop of the MR valve can be adjusted to control the working states and damping force of the MR damper.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2022)
Article
Instruments & Instrumentation
Quoc-Duy Bui, Quoc Hung Nguyen, Long-Vuong Hoang, Duc-Dai Mai
Summary: This paper introduces a novel self-adaptive shear-mode magneto-rheological (MR) damper for controlling vibrations of washing machines more effectively than commercial passive dampers. The damper can adjust damping levels based on external vibratory excitations without any control equipment or power unit, and has a simple and compact structure as well as displacement-dependent damping characteristic.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Construction & Building Technology
Chao Zhao, Qujian Li, Xingu Zhong, Tianyu Zhang
Summary: A composite cementitious material named as porous metal concrete (PMC) is proposed in this study, which has excellent characteristics such as large plastic deformation and superior energy absorption properties. The presence of porous metal may be one of the possible reasons for the excellent mechanical properties of PMC.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Quyang Liu, Wei Zhai
Summary: In this study, hierarchical porous ceramic lattices were fabricated using direct ink writing (DIW) technique and emulsion processing methods, and it was discovered that different gelling additives led to distinctive microstructures. The 3D printed hierarchical porous ceramics exhibited high porosity and compressive strength, making them suitable for various applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Multidisciplinary
Zhangtao Shen, Yapei Zu, Song Ma, Yuqiu Chen, Zhidong Zhang, Jun Gong, Chao Sun
Summary: By adjusting the pyrolysis temperature and Fe20Ni80 doping amount, the structure and composition of the composites can be controlled, enhancing the microwave absorption performance. The composite pyrolyzed at 800 degrees C with an optimal Fe20Ni80 doping amount of 2 mmol shows the highest performance. With a filler loading of 15 wt% and a thickness of 3 mm, the composite achieves the minimum reflection loss value of -39.5 dB at 6.7 GHz. Additionally, under the optimal matching thickness of 2.2 mm, the composite exhibits a maximum effective absorption bandwidth of 5.4 GHz (8.0-13.4 GHz), covering the entire X-band.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Mechanical
Pavan Kumar Archakam, Sreekumar Muthuswamy
Summary: The world is increasingly using intelligent technologies in automobiles, particularly in the development of autonomous vehicles. These vehicles are equipped with devices that can predict and avoid dangerous situations, and have a smart crash energy absorption system that adjusts its capability based on the severity of the crash.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2023)
Article
Mechanics
Suryarao Nagiredla, Sharnappa Joladarashi, Hemantha Kumar
Summary: The study found that the length and location of MR fluid pockets have a significant impact on the dynamic response of composite sandwich beams, with the effect varying depending on the type of boundary condition used.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Chemistry, Physical
Guangjun Gou, Yu Liu, Qi Wan, Wanlu Hua, Xiaoli Xie, Bin Zhu, Zhen Tao
Summary: In this study, nitrogen-doped porous Fe3C@C nanocomposites were fabricated by the preblowing and in situ carbonization method using Fe(NO3)3·9H2O and polyvinyl pyrrolidone (PVP). The material treated at 600 degrees C, with a nitrogen content of 4.07%, exhibited excellent microwave absorption properties with a minimal reflection loss of - 63.1 dB at 5.0 GHz and a matching thickness of 4.6 mm. The microwave absorption performance was attributed to the synergy of magnetic-dielectric loss and improved interfacial polarization. This research provides a method for the preparation of high-performance microwave absorbing materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Yuan-Cheng Zhu, Guo-Feng Yao, Min Wang, Hang Yu, Kui-Yang Gao, Pei-Lei Zhou
Summary: This paper presents a design of a semiactive hydraulic engine mount (HEM) based on the tuned mass damper (TMD) model. The newly designed HEM utilizes a helical moving plate to control damping and offers a wider range of dynamic stiffness control compared to MR fluid mounts. The experimental results validate the effectiveness of the proposed design.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Xiangyu Cheng, Zhonghao Bai, Feng Zhu, Clifford C. C. Chou, Binhui Jiang, Shiwei Xu
Summary: This study proposes a magnetorheological bionic energy-absorbing element (MBEE) inspired by the horsetail structure, which is applied to the design of thin-walled tubes to achieve variable and controllable crashworthiness. Theoretical analysis, numerical analysis, and optimization are conducted to study the crashworthiness and controllability of MBEE in depth. The results show that the MBEE has high controllability and total energy absorption, and when filled into traditional thin-walled tubes, it significantly improves the total energy absorption and specific energy absorption.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
A. P. Simonov, I. V. Sergeichev
Summary: The direct impact method provides a higher sample deformation rate and reliable results for materials with low yield strength and hardening rate. This study proposes an alternative procedure for calculating the strain rate in order to improve accuracy of the direct impact method for a wide range of metals and alloys. The proposed method has been validated through finite element analysis and direct impact tests, and it qualitatively changes the shape of the stress-strain curve by adding an unloading area.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Qiang Wei, Zifeng Li
Summary: This study investigates the dynamic bifurcation of a column when it impacts a rigid plane vertically, which is different from the classical Eulerian static buckling. The findings show that either the dimensionless critical buckling time or the dimensionless critical buckling velocity can be used to determine whether buckling has occurred. Different dimensionless initial defects in the column result in different dimensionless displacement responses, and the nonlinear effect influences the analysis results.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
M. C. Price, M. J. Cole, K. H. Harriss, L. S. Alesbrook, M. J. Burchell, P. J. Wozniakiewicz
Summary: This article introduces a new gas gun developed at the Centre for Astrophysics and Planetary Science, University of Kent, which can produce vertical impacts at speeds up to 2 km/s. The gun design, assembly, operation, and ancillary components are described in detail. The experimental results demonstrate that the gun performs as expected.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Fanny Gant, Gabriel Seisson, Patrice Longere, Skander El Mai, Jean-Luc Zinszner
Summary: The article investigates the high strain rate response of metals and alloys under radial expansion and compares different materials. The results show that different materials exhibit different responses in terms of deformation and fracture.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
M. D. Fitzgerald, J. D. Pecover, N. Petrinic, D. E. Eakins
Summary: This study investigates the mechanism for the destruction of thick flyers accelerated using electric guns and proposes strategies for mitigating their break-up based on experimental results and mathematical models. The findings suggest that limiting the maximum pressure within the flyer and extending the current rise time can prevent flyer failure, increasing the efficiency and shock duration of the electric gun.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Guowen Gao, Enling Tang, Guolai Yang, Yafei Han, Mengzhou Chang, Kai Guo, Liping He
Summary: In this study, the dynamic constitutive model of Al/Ep/W material was investigated and verified through experiments and numerical simulations. The proposed model accurately described the mechanical behavior of the material under high strain rates, providing an important reference for evaluating the response characteristics of the new energetic material projectile to lightweight aluminum armor.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Minzu Liang, Meng Zhou, Xiangyu Li, Yuliang Lin, Fangyun Lu
Summary: UHMWPE fiber mesh reinforced polyurea composites improve structural strength and blast resistance performance, and can alter the failure mode. Loose filler is generated as polyurea melts and fragments penetrate. Joint loads are classified into three categories based on their connection and duration.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Ashutosh Jha, Guglielmo Cimolai, Iman Dayyani
Summary: The present article introduces the Zero Poisson's Ratio Fish Cells metamaterial and investigates the effects of Poisson's ratio on the crashworthiness of different lattice structures. Numerical results demonstrate that the Zero Poisson's Ratio model possesses greater stability and structural integrity with minimal edge deformations.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Hongbo Zhang, Dayong Hu, Xubin Ye, Xin Chen, Yuhuai He
Summary: This study investigated the impact of spherical foreign objects on simulated blade edges through experimental and theoretical analysis. The experimental results showed that increasing impact energy resulted in larger damage sizes, and three distinct types of deformations were observed in FOD. Accurate FOD prediction models were developed using linear and power formulas. The theoretical analysis using a spring-mass system based on Winkler's elastic-plastic foundation theory yielded results in good agreement with experimental measurements, providing a reference for fatigue life assessment of aeroengine blades.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
L. M. Reitter, Y. A. Malik, A. B. Jahn, I. V. Roisman, J. Hussong
Summary: This study characterizes the dynamic strength of wet granular ice layers through impact tests. The results reveal strong connections between ice particles in ice layers generated by ice crystal accretion. Comparable strength values can be obtained by reinforcing ice particle connections in ice layers prepared in the laboratory.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Kyle Mao, Genevieve Toussaint, Alexandra Komrakova, James D. Hogan
Summary: In this study, the Generalized Incremental Stress State dependent damage MOdel (GISSMO) is used to simulate the high-velocity impact failure of Armox 500T steel. The GISSMO is calibrated and validated using experimental data from the literature, and is then applied to investigate the impact failure behaviors of bi-layered steel systems. The results provide new capabilities and insights for the design of armor structures and evaluation of impact failure behaviors in Armox 500T/RHA bi-layered systems.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Asim Onder
Summary: This paper investigates the performance of bumper plates with wavy surfaces under hypervelocity impact and finds that they are more effective in decreasing the impact energy compared to flat plates. The study also reveals the distinctive debris cloud generation that has never been reported before.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Zhi-Yong Yin, Xiao-wei Chen
Summary: This study numerically reveals three typical fracture modes of explosively-driven metal shells and investigates the influencing factors of different fracture modes through experimental data and dimensional analysis.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Jiri Pachman, David J. Chapman, Marek Foglar, Martin Kunzel, William G. Proud
Summary: Through the study of different types of concrete, it was found that despite their compositional complexity, range of compressive strengths, and reinforcement methods, the average Hugoniot data were remarkably similar between different concrete types.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Konstantin Kappe, Klaus Hoschke, Werner Riedel, Stefan Hiermaier
Summary: This paper presents a multi-objective optimization procedure for effectively designing gradient lattice structures under dynamic loading. The aim is to maximize energy absorption characteristics and achieve a lightweight design. Through considering design variables such as the relative density and density gradient, the peak crushing force reduction and maximized specific energy absorption are simultaneously optimized. A simplified beam-based finite element model is used to efficiently model and simulate the lattice structures. An artificial neural network is trained to predict energy absorbing characteristics and find optimal lattice structure configurations. The network is trained using a multi response adaptive sampling algorithm, allowing parallel simulation with automatically generated finite element models. A multi-objective genetic algorithm is then used to find optimal combinations of design parameters for lattice structures under different impact velocities and cell topologies.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)