Article
Materials Science, Multidisciplinary
Jianxun Zhang, Yinggang Miao, Qinghua Qin, Tongqing Lu, Yang Ye, He He, Jikun Wang, Hua Li
Summary: This study investigates the mechanical behaviors of hydrogels under the influence of different fluid compositions through static and dynamic experiments. It is found that immersion in FeCl3 solution can increase the strength of hydrogels.
MECHANICS OF MATERIALS
(2021)
Article
Chemistry, Physical
Lei Li, Guolai Yang, Liqun Wang, Qingle Wu
Summary: The dynamic mechanical behavior of sintered neodymium iron boron (NdFeB) under high-speed impact conditions has been studied experimentally and theoretically, providing a theoretical basis and experimental support for its application in the field of impact.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Construction & Building Technology
Lei Xie, Xinjian Sun, Zhenpeng Yu, Zhixuan Guan, Anxiong Long, Huiheng Lian, Yaojie Lian
Summary: An experimental study was conducted to investigate the dynamic mechanical properties of basalt fiber reinforced concrete (BFRC) under different strain rates, fiber contents, and fiber lengths. The results showed that increasing strain rates significantly enhanced the compressive failure extent, compressive strength, and dynamic increase factor of BFRC. Under constant strain rates, the compressive strength, dynamic increase factor, and deformability of BFRC initially increased and then decreased with increasing fiber content or fiber length. The study provided valuable insights into the impact performance of BFRC and offered a basis for the design and analysis of BFRC structures under dynamic loads.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Aerospace
Zhiyi Wang, Chuanzhi Chen, Jinbao Chen, Guang Zheng
Summary: This paper presents a novel 3D soft-landing dynamic model for a legged lander and its numerical solution process. The model takes into account the 6-DOF motion of the lander's base model with mass center offset settings, as well as the 3-DOF spatial motion of each landing gear. The model also considers factors such as buffering force, footpad-ground contact, and inter-structure friction. Comparative studies with a simulated model validate the proposed model's effectiveness, and further investigation into different contact force and friction models provide insights into the soft-landing performance of the lander.
Article
Mechanics
Xiang Zhou, Youjun Xie, Guangcheng Long, Xiaohui Zeng, Jiangteng Li, Ning Li, Fan Wang, Hussaini Abdullahi Umar
Summary: This paper presents a quantitative evaluation of the effect of end friction on the dynamic mechanical response and damage evolution of concrete based on the coupled Discrete Element Method (DEM) - Finite Difference Method (FDM) method. The results indicate that the end friction has a significant effect on the stress-strain response, dynamic increase factor (DIF), damage distribution and failure mode of concrete. The increase of the interfacial friction coefficient significantly enhances the dynamic compressive strength of concrete, but the enhancement effect weakens when the coefficient exceeds 0.1. With the increase of strain rate, the friction contribution coefficient tends to decrease. The end friction confinement changes the local stress state and damage distribution of concrete, which is beneficial to improve the compressive strength of concrete.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Wei Yao, Xing Li, Kaiwen Xia, Mikko Hokka
Summary: The study investigated the dynamic flexural tensile strengths of Laurentian granite under different hydrostatic pressures, revealing that both loading rate and hydrostatic pressure affect the dynamic flexural tensile strength. An empirical formula was proposed to predict this behavior. Additionally, a two-parameter tensile strength model was improved to quantify the relationship between hydrostatic pressure and characteristic material length for rocks. Moreover, the fractal dimension was used to describe surface roughness, showing a decrease with increasing loading rate for LG.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Construction & Building Technology
Yanfei Zhao, Bo Wu, Shuai Peng, Zhenpeng Yu, Xiaoqing Du
Summary: This paper investigates the influence of steel fiber on the dynamic compressive behavior of steel fiber reinforced concrete (SFRC) at different strain rates and proposes a suitable dynamic constitutive model for SFRC. The effects of steel fiber content and strain rate on the dynamic mechanical properties of concretes are analyzed. The reinforcement mechanism of steel fibers is analyzed via CT scanning technology. The proposed SFRC dynamic constitutive model is verified through numerical simulation and shows good applicability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Jingwei Gao, Lifeng Fan, Zhang Wan
Summary: The study found that the dynamic properties of granite, such as P-wave velocity, P-wave modulus, and dynamic compressive strength, decrease exponentially with an increase in the number of thermal cycles. This decrease mainly occurs during the first thermal cycle, with the P-wave modulus and dynamic strength decreasing significantly. Impact failure generates smaller fragments and more fine powder, with these observations becoming more pronounced as the number of thermal cycles increases. The tests reveal a close relationship between the dynamic properties of thermally damaged granite and microcracks induced by thermal cycling.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Mechanical
Yuanyuan Liu, Xiaodong Sun, Kian K. Sepahvand, Steffen Marburg
Summary: This paper introduces an analytical model of a three-pad squeeze film bearing and analyzes its static and dynamic performance through numerical methods, showing good agreement with experimental results. The study suggests that eccentricity can be controlled by adjusting vibration amplitude or nominal clearance of the bearing, while decreasing rotation speed or increasing vibration amplitude will increase direct stiffness and damping coefficients.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Mechanical
Junwei Chen, Siyuan Gu, Xiaoping Zhou
Summary: This paper investigates the dynamic properties and failure behaviors of specimens with and without a weak interlayer through a combined numerical and experimental analysis. It is found that the existence of a weak interlayer can cause stress concentrations and alter the failure behaviors under dynamic stress waves.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Materials Science, Ceramics
Y. J. Deng, H. Chen, X. W. Chen, Y. Yao
Summary: This study investigated the failure behavior of TiB2-B4C ceramics under impact loading using SHPB testing and high-speed photography, identifying two different failure modes and proposing a new energy utilization ratio as an evaluation index. Additionally, a calculation method based on fractal theory was introduced to quantify the ceramic crushing process.
CERAMICS INTERNATIONAL
(2021)
Article
Mechanics
Liang Ren, Xianming Yu, Mingxin Zheng, Zhihui Xue, Bitao Wu, Yu He
Summary: This paper evaluates the feasibility of typical dynamic damage models used for UHPC based on SHPB technology and verifies the accuracy of the models through a comparison with measured waveforms.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Energy & Fuels
Jinhui Xu, Yong Kang, Yi Hu, Feng Liu, Zuan Wang, Xiaochuan Wang
Summary: The research shows that the dynamic compressive strength and elastic modulus of granite are negatively correlated with water temperature, while strain rate can enhance the mechanical strength. The number and size of pores and microcracks in granite increase with rising temperature, and higher water temperatures exacerbate hydrothermal damage.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Geochemistry & Geophysics
Ziheng Sha, Hai Pu, Junce Xu, Hongyang Ni, Shiru Guo
Summary: Dynamic compression tests were conducted on sandstone specimens to investigate the effects of accumulated damage and high strain rate on mechanical behavior and damage evolution. The results showed that accumulated damage significantly influenced the stress-strain curves, compressive strength, and deformation modulus of the specimens. A statistical damage constitutive model based on Weibull distribution was proposed to describe the effects of accumulated damage and strain rate on sandstone's mechanical behavior.
Article
Engineering, Civil
Tianrui Li, Jiagui Liu, Yuqing Ding, Tiequan Kong, Guokai Zhang, Ning Zhang, Gan Li
Summary: The interaction of moisture content, strain rate, and dry density affects the dynamic mechanical properties of sandy soils with certain cohesion at high strain rates. The compaction degree can be used as a substitute for dry density, and increasing compaction degree enhances the uniaxial compressive strength of sandy soil while reducing moisture content weakens it. The compressive response of sandy soil is also sensitive to strain rate.
TRANSPORTATION GEOTECHNICS
(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)