Article
Nanoscience & Nanotechnology
Shengtong He, Weidong Zeng, Runchen Jia, Jianwei Xu, Xing Zhang
Summary: High strain rate compression of Ti-60 titanium alloy with equiaxed structure was studied using split-Hopkinson pressure bar technique. The results showed that increasing temperature led to a decrease in flow stress and yield stress for Ti60 alloy, with the formation of adiabatic shear bands and recrystallization grains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Mechanics
Mengyang Zhai, Lei Xue, Hongran Chen, Chao Xu, Yuan Cui
Summary: The study found that the shear rate significantly affects the failure process and AE characteristics of layered rocks. Increasing shear rate leads to higher average released AE energy, while decreasing total AE number and b-values, indicating faster crack propagation and more high-energy AE events.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Pratyush Srivastava, Katherine Jiang, Yinan Cui, Edgar Olivera, Nasr Ghoniem, Vijay Gupta
Summary: Experimental results show that reducing sample size can decrease the strain rate sensitivity of plastic flow, including flow stress and strain burst statistics. Nano-sized samples exhibit more stable scaling effects, while micron-sized samples show truncated scaling effects.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Multidisciplinary
Shiyuan Zhou, Haoyan Tan, Shifeng Liu, Chao Deng, Yahui Liu, Jialin Zhu, Xiaoli Yuan
Summary: This paper studied the mechanical properties of pure tantalum (Ta) hat-shaped samples during dynamic impact and characterized the microstructures at different reductions. The results showed the formation of ultrafine grains in the adiabatic shear band (ASB). The shear yield strength was about 703.65 MPa when the reduction was 40% and then decreased with increasing strain. The ASB could be divided into transition and central regions, with ellipsoidal dynamically recrystallized (DRX) grains in the central region and split grains in the transition region. The density of geometric necessary dislocations (GNDs) in the transition region was higher than that in the central region. The average hardness in the matrix region was about 88.80 HV, while in the ASB it reached 239.08 HV. The maximum temperature within the ASB was calculated to be approximately 1100 K before ASB formation. According to the mechanically driven subgrains rotation model, subgrains inside the ASB slipped and rotated under shear forces or normal stresses, resulting in the formation of a (110) // shear plane normal (SPN) texture near the top of the ASB and a (110) // shear direction (SD) texture near the bottom.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Biomedical
Cinzia Peruzzi, Rajaprakash Ramachandramoorthy, Alexander Groetsch, Daniele Casari, Philippe Gronquist, Markus Rueggeberg, Johann Michler, Jakob Schwiedrzik
Summary: The study found that the mechanical response of lamellar bone at the micrometer scale is similar to that at the macro scale, indicating that strain rate sensitivity is an intrinsic property of the bone extracellular matrix. Significant shear band thickening was observed at high strain rates, suggesting that the bone material is unable to accommodate the imposed deformation.
ACTA BIOMATERIALIA
(2021)
Article
Materials Science, Composites
Fei Weng, Yingying Fang, Mingfa Ren, Jing Sun, Lina Feng
Summary: This paper studied the shear mechanical properties of CFRP composites under dynamic loading through experimental methods. Results showed that the strain rate sensitivity of in-plane shear properties is greater than interlaminar shear properties. Empirical formulas for high strain rate effects were derived, providing guidance for strength and modulus prediction. Additionally, the failure modes of specimens were analyzed.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Geological
Jun Zhao, Liang Hu, Xiating Feng, Yaxun Xiao, Yue Guo
Summary: The shear mechanical properties are important factors in rock mass failure. However, there is a lack of research on the shear mechanical behavior of rocks under three-dimensional stress, especially considering the influence of lateral stress on shear failure mechanism. This study conducted direct shear, true triaxial stress shear, and confining shear tests to investigate the deformation, failure modes, strength, and surface roughness of sandstone. The study also focused on studying the influence of lateral stress on the shear failure mechanism of sandstone under true triaxial stress by analyzing the acoustic emission characteristics during failure.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
T. R. Stacey, J. Wesseloo
Summary: Design methods in rock engineering are established but may be inappropriate for deeper and more competent rock mass conditions, requiring prediction of rock mass behaviors. This paper focuses on extensile fracturing as the initiating mechanism of failure and presents examples of fracture development in hard rock to illustrate the challenges in predicting rock engineering behaviors.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Xing Wei, Yuanyuan Liu, Yan Yu, Xianglin Zhang, Peter Hodgson
Summary: The plastic deformation and ductile fracture behavior of TRIP800 steel were investigated under different stress states and strain rates. The results showed that both the stress state and strain rate have a significant effect on the mechanical properties and fracture mechanism of this alloy. The loading strain rate can change the fracture mode.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Characterization & Testing
Yang Bai, Haitao Wei, Jiahui Gu, Zhenqiang Zhao, Chao Zhang
Summary: The dynamic characterization of textile composites is challenging due to limitations in specimen size. This study investigated the dynamic compression behavior of a 3D angle interlock woven composite using the split Hopkinson pressure bar. The results showed that an increase in strain rate led to higher strength and more severe damage. Different-sized specimens exhibited similar failure processes. Comparatively, the weft-direction specimens had higher strength and distinct failure modes compared to the warp-direction specimens.
Article
Polymer Science
Shiyu Wang, Lihua Wen, Jinyou Xiao, Ming Lei, Xiao Hou, Jun Liang
Summary: This paper investigates the evolution of the dynamic properties of woven thermoplastic composites with strain rate and damage process at elevated temperatures. Results showed that thermoplastic composites possess strain-rate strengthening effects and high-temperature weakening dependence. Some empirical formulations are proposed for more accurately predicting the out-of-plane dynamic-compression behavior of thermoplastic composites.
Article
Chemistry, Physical
Yunxiang Bai, Mingquan Zhu, Shijun Wang, Luqi Liu, Zhong Zhang
Summary: This study investigates the dynamic electrical failure behavior and mechanism of carbon nanotube ribbons through experiments and theoretical calculations, and demonstrates the significant impact of electrical stress rates on failure resistance. It suggests the establishment of a uniform standard for ampacity testing method.
Article
Crystallography
Kanghe Jiang, Wei Li, Jingwei Chen, Li Ma, Wu Zeng, Junjie Yang
Summary: This study investigates the cyclic mechanical behavior and failure mechanism of the Ti-45Al-4Nb-1Mo-0.15B alloy under strain-controlled low cycle fatigue at temperatures of 400°C and 750°C. The alloy exhibits stable cyclic characteristics and the cyclic stress-strain relationship is well described by the Ramberg-Osgood equation. The fatigue lifetime at different temperatures shows a log-linear relationship with the total strain ranges. The fracture morphology suggests that the main fracture mode at 400°C is brittle, while at 750°C it is ductile. The trans-lamellar fracture dominates in the lamellar microstructure and the inter-lamellar fracture decreases with increasing strain amplitude.
Article
Engineering, Mechanical
Zhenhua Song, Rui Chen, Dongling Guo, Canwen Yu
Summary: The dynamic shear mechanical properties of ice were investigated using reinforced hat-shaped specimens and SHPB experiments, and it was found that these properties were sensitive to shear strain rate. The relationship between dynamic shear strengths and shear strain rates was linear. The failure of ice at complex stress states was determined using the Mohr-Coulomb criterion, where the internal friction angle was insensitive to shear strain rate while the cohesion was sensitive.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Mechanics
Zhen Shen, Hongjun Yu, Licheng Guo, Liulei Hao, Kai Huang
Summary: The study modifies the traditional G criterion by introducing the critical volumetric to distortional energy release rate ratio, demonstrating its superior predictability for crack propagation behavior. The crack kinking angle decreases with an increasing critical ratio, but enlarges with higher T-stress or fracture process zone size. Furthermore, fracture resistances decrease with increasing critical ratio, T-stress, or fracture process zone size.
INTERNATIONAL JOURNAL OF SOLIDS 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)