Article
Construction & Building Technology
Chong Lian, Yubo Wang, Shan Liu, Hong Hao, Yifei Hao
Summary: This paper presents an experimental study on the dynamic mechanical properties of alkali-activated concrete (AAC) with different strengths. The results show that the compressive and tensile properties of AAC are significantly affected by strain rate, and the strength grade also affects its strain rate sensitivity. The existing empirical relations for strain rate effect in ordinary Portland cement concrete (OPC) are not applicable to AAC.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Z. H. Wang, H. M. Wen, H. Zheng, J. S. Cheng
Summary: This study investigates the dynamic increase factors of concrete-like materials at ultra high strain rates through a combination of theoretical and experimental methods. It is found that the dynamic increase factor for concrete-like materials in compression due to strain rate effect only can be regarded as a constant at very high strain rates. In addition, the previously proposed semi-empirical equations accurately describe the strain rate sensitive behavior of concrete-like materials in both tension and compression.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Bo Hu, Teng-Fei Meng, Yuan Li, Dao-Zhong Li, Long Chen
Summary: The study found that strain rate has a significant influence on the failure modes, compressive load-deformation curves, absorption energy, and splitting tensile bond strength of concrete interfaces, while surface roughness and interface age have minimal effects on the splitting tensile bond strength. Existing formulas for the dynamic increase factor of tensile strength of concrete-like materials cannot be applied to concrete interfaces, leading to the proposal of a new formula for the dynamic increase factor of the splitting tensile bond strength of concrete interfaces.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Construction & Building Technology
Haotian Fan, Hongfa Yu, Haiyan Ma
Summary: This study provides a comprehensive review and analysis of 116 publications on the dynamic increase factor (DIF) in concrete. The study examines over 1500 DIF data points from 49 models to assess the impact of various factors on DIF. The results indicate that static strength has the most significant effect on DIF, followed by specimen diameter, silica fume content, fiber content, GGBS content, and fly ash content. The study also establishes mathematical models to demonstrate the relationship between specimen size or static strength and dynamic strength of concrete, and investigates the influence of fibers and cement type on DIF.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Physical
Zhangchen Qin, Dan Zheng, Xinxin Li, Haicui Wang
Summary: This paper investigates the strain and dynamic strength characteristics of concrete material through experiments and modeling analysis, and demonstrates the significant influence of inertia on the dynamic response of concrete.
Article
Construction & Building Technology
Yanchao Shi, Ning Wang, Zhong-Xian Li, Yang Ding
Summary: The mechanical properties of clay bricks under high strain rates are studied, with limited research available. Experimental investigations are conducted to explore the dynamic mechanical properties of clay bricks at different strain rates, and empirical relations between dynamic increase factors and strain rates are proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Composites
Qiang Fu, Wenrui Xu, Jiaqi He, Li Su, Hao Song, Ditao Niu
Summary: Under dynamic conditions, the strength of BFRCAC increases with the strain rate and confining pressure, with the dynamic H-B strength criterion showing higher calculation accuracy.
COMPOSITES COMMUNICATIONS
(2021)
Article
Construction & Building Technology
Yu Liu, Hong Hao, Yifei Hao, Jian Cui
Summary: Corrosion damage of steel reinforcement has a significant impact on the load-carrying capacity of reinforced concrete structures by reducing the strength of reinforcement bars and weakening the bond between reinforcement and concrete. This study investigated the effect of corrosion on the bond behavior between steel reinforcement and concrete under high rate dynamic load through laboratory tests.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Mechanical
Jian Li, Liu Jin, Xiuli Du
Summary: A universal static-dynamic biaxial strength criterion for concrete material was established in this study, considering the effects of strain rate and lateral stress ratio on dynamic biaxial strength. The proposed criterion overcomes the limitations of traditional test conditions, providing a wider range of applicability and a more concise expression.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Mechanics
Wenxuan Yu, Liu Jin, Xiuli Du, Xiaofang Deng
Summary: This paper presents a systematic experimental investigation to evaluate the effect of the initial damage degree on static and dynamic compressive/splitting-tensile failure behaviors of concrete cubes with various structural sizes. Test results indicate that as the initial damage degree increases, both static and dynamic nominal strength are reduced. The influence of initial damage degree on dynamic failure strength is more significant than that on static strength.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Vu Truong Vu, Tuan Kiet Tran, Dong Joo Kim, Duy-Liem Nguyen, Ngoc Thanh Tran
Summary: This study investigates the effects of matrix strength on the high-rate tensile resistance and strain rate sensitivity of strain-hardening fiber-reinforced concretes (SHFRCs) under direct tensile loading. The results show that high-performance concrete (HPC) has relatively lower post cracking strength but higher strain capacity at a high strain rate compared to ultra-high-performance concrete (UHPC). Furthermore, the proposed artificial neural network (ANN) model is an efficient tool for predicting the strain rate sensitivity of SHFRCs.
STRUCTURAL CONCRETE
(2023)
Article
Construction & Building Technology
Chong Chen, Xihong Zhang, Hong Hao
Summary: Geopolymer concrete (GPC) has attracted attention due to its utilization of industry waste and outstanding mechanical properties. This paper presents an experimental study on the dynamic tensile properties of GPC and fibre reinforced GPC (FR-GRC) with steel and PP fibres. The addition of fibres effectively improves the ductility of GPC. Fibre stretching process contributes to crack reduction and energy dissipation. The split-tensile properties of GPC and FR-GPC are strain rate sensitive.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Mechanical
Wenxuan Yu, Liu Jin, Renbo Zhang, Xiuli Du
Summary: Studies have shown that heat conduction is relatively fast in small-sized concrete, reaching an equilibrium state quickly, and high temperatures can weaken the strain rate hardening-effect of concrete.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Review
Construction & Building Technology
Zhe Xiong, Zhen Fang, Wanhui Feng, Feng Liu, Fei Yang, Lijuan Li
Summary: The reuse of waste tyres for making rubberised concrete meets sustainable development requirements. While research on the dynamic behavior of rubberised concrete is limited, adding rubber particles can enhance various properties of concrete.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Shady Salem, Elamir Eissa, Eman Zarif, Sarah Sherif, Mostafa Shazly
Summary: This research experimentally assesses the compressive strain rate effects of concrete at different saturation levels and introduces calibration factors to account for the degree of saturation. The proposed calibrated equation shows more reliable predictions than the current equation used in the literature.
AIN SHAMS ENGINEERING JOURNAL
(2023)
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)