Article
Engineering, Mechanical
Balaji Vengatachalam, Rong Huang, Leong Hien Poh, Zishun Liu, Qinghua Qin, Somsak Swaddiwudhipong
Summary: The study investigates the initial yield characteristics of closed-cell aluminium foam in multiaxial stress states through experimental and numerical approaches. The experimental results show a consistently stiffer response of the closed-cell foams in tension-dominated stress states, attributed to the stretching mode of deformation in cell walls. The study proposes an yield criterion for closed-cell aluminium foams that captures the asymmetric nature of the yield surface about the effective stress axis, based solely on the uniaxial compressive yield strength.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Nanoscience & Nanotechnology
Nima Movahedi, Thomas Fiedler, Alper Tasdemirci, Graeme E. Murch, Irina Belova, Mustafa Guden
Summary: This study investigates the performance of functionally graded metal syntactic foams (FG-MSF) under different impact velocities. The results show that increasing the impact velocity can enhance the compressive strength and energy absorption of the foam.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Dilip Muchhala, B. N. Yadav, Ashutosh Pandey, Rajeev Kumar, Amitava Rudra, Venkat Chilla, D. P. Mondal
Summary: The hot deformation behavior of different types of foams was investigated at different test temperatures and strain rates. It was found that the energy absorption capacity of the foams decreased with increasing test temperature and increased with increasing strain rate. The hybrid foam with the addition of cenospheres and SWNTs showed the highest plateau stress and energy absorption. The deformation mechanism of the foams varied with temperature and strain rate, as revealed by the activation energy data.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Coatings & Films
Dao-Zhang Liu, Xu Cheng, Huan Liu, Hao-Tian Shen, Zhong-Sheng Hua, Shi-Wei He
Summary: The present study manufactured hybrid closed-cell foams consisting of two materials with different ductilities to improve energy absorption capacity. The results demonstrated a significant synergistic effect between the foams and coating, leading to increased densification strain and improved energy absorption capacity. Among the specimens investigated, the Al/Zn-Cu(A) foam showed the best performance.
SURFACE ENGINEERING
(2022)
Article
Engineering, Civil
Baolong Gou, Xiuli Wang, Renhong Wang, Chang Wu
Summary: This study investigates the performance and failure mechanisms of the AAG joint under different conditions, including the tensile properties at room temperature and the dynamic response behavior under impact load. The results show that the AAG joint has good impact resistance, and the effectiveness of the optimized finite element model is verified through numerical simulation.
THIN-WALLED STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Mohammad Shahid Raza, Susmita Datta, Partha Saha
Summary: The experiment compared the load-deformation curves of closed-cell aluminum foams with and without face sheets, finding that the foams with face sheets had higher maximum loading capacity and exhibited more stable behavior under loading. Foams with face sheets showed gradual pore deformation and mixed deformation modes in the fractured region, while those without face sheets displayed a ductile-brittle failure mode.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Zhenyu Jiao, Zhiguo Li, Fengchao Wu, Qiannan Wang, Xuhai Li, Liang Xu, Ling Hu, Yang Liu, Yuying Yu, Changming Hu, Jianbo Hu
Summary: Plate-impact experiments were conducted to investigate the dynamic behavior of near-equiatomic NiTi shape memory alloys with different initial phases. The results showed that B2 austenite undergoes a martensitic transformation at -5 GPa, influencing both spall damage and deformation mechanism of the alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
S. S. Dash, Z. Y. Liu, Y. Zou, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: The compressive deformation behavior of a high-pressure die-cast Silafont-36 aluminum alloy was evaluated in relation to the microstructural changes during deformation. The study found that the load-bearing capacity of eutectic Si particles and thermal mismatch enhanced dislocation density strengthening were the predominant strengthening mechanisms in the alloy, along with a certain degree of Orowan strengthening mechanism. Additionally, the work hardening capacity of the cast alloy was mainly attributed to the increase in the dislocation density in the softer α-Al matrix, which was further assisted by the presence of eutectic Si particles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jinqi Pan, Wencong Zhang, Jianlei Yang, Songhui Wang, Xiaoyu Wang, Liqiang Zhan, Wenzhen Chen
Summary: In this study, the microstructural characterization and mechanical behavior of the extruded ZK61 alloy under dynamic and quasi-static loading at 623 K were investigated. It was found that an adiabatic shear band (ASB) composed of ultra-fine grains was formed under dynamic loading, while shear deformation occurred in an area with equiaxed grains under quasi-static loading. The stress-strain curve of dynamic loading showed high yield stress and long working-hardening stage, while the strain-hardening and thermal-softening in quasi-static curves reached a dynamic balance.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Caihong Hou, Wenjun Zhu, Jianbo Hu, Xiaoping Ouyang
Summary: In this paper, the anisotropic response mechanism and microscopic deformation mechanism of nanotwinned Cu with [111] texture under shock loading are investigated using molecular dynamics simulations. The results show that the textured nanotwinned Cu exhibits obvious anisotropy at lower impact velocities and the loading direction significantly influences the deformation behavior.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
M. A. Kader, P. J. Hazell, M. A. Islam, S. Ahmed, M. M. Hossain, J. P. Escobedo, M. Saadatfar
Summary: This study investigated the strain rate sensitivity and deformation mechanisms of closed-cell aluminium foams under low-velocity impact loadings through instrumented drop-weight impact experiments and Finite Element (FE) modelling. Both the experiments and FE modelling showed significant rate sensitivity of the foam within the examined range of strain rates. The results collectively indicate that the rate sensitivity of the base material is primarily responsible for enhancing strength during impacts.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Construction & Building Technology
Shunze Cao, Yang Lu, Nan Ma, Yang Tao, Yuwu Zhang
Summary: This study investigates the mechanical behaviors and dynamic stress enhancement mechanisms of thermoplastic polyethylene foams reinforced by glass beads (GBs). The results show that increasing loading rates lead to more pronounced strain and stress localizations, contributing to enhancements of elastic properties and plastic stress of GBs reinforced foams. Additionally, the volume fraction of glass beads and polymer have negative and positive influence on the energy absorption efficiency of the foams, respectively.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Y. J. Duan, J. C. Qiao, T. Wada, H. Kato, Y. J. Wang, E. Pineda, D. Crespo
Summary: Dynamic mechanical analysis was performed on two metallic glasses with distinct beta relaxation features. The presence of free-volume zones and inelastic deformation behavior led to significant mechanical hysteresis loops in dynamic cyclic loadings, which can be described using a viscoelastic model. Annealing below the glass transition temperature reduced the concentration of free-volume zones, providing insights into improving the mechanical properties of high entropy metallic glasses.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Multidisciplinary
Piyush Wanchoo, Shyamal Kishore, Arun Shukla
Summary: This study investigates the hydrostatic elastic response and yield behavior of PVC foams under high strain rate hydrostatic loading conditions. A novel underwater high strain rate loading facility is used, and 3-D Digital Image Correlation (DIC) technique and ultra-high-speed photography are employed to obtain full-field volumetric deformation data. The foam materials show an increase in bulk modulus and yield strength under high strain rate loading, with the increment being highly sensitive to the material bulk mass density.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Junyu Zhu, Fabien Briffod, Takayuki Shiraiwa, Manabu Enoki, Satoshi Emura
Summary: The plastic deformation behavior of an alpha/beta two-phase Ti-10Cr alloy with fine lamella microstructure was investigated. The crystallographic and kinematical relationships among the formed deformation bands were clarified through the analysis of the crystallographic relationship between the matrix, the twin, and the precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Engineering, Mechanical
R. Dubey, R. Jayaganthan, D. Ruan, N. K. Gupta, N. Jones, R. Velmurugan
Summary: This document reviews recent research on the mechanical properties of 6xxx series aluminium alloys and the crashworthiness of tubes made of these alloys. The review focuses on the material response at high strain rates and the structural response under quasi-static and dynamic loadings. It also discusses the effects of processing routes and heat treatments on the dynamic behavior of the alloys, as well as the correlation between material response and microstructural features.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Review
Engineering, Mechanical
R. Dubey, R. Jayaganthan, D. Ruan, N. K. Gupta, N. Jones, R. Velmurugan
Summary: This study evaluates the mechanical response of 6xxx series aluminium alloys under dynamic loads, focusing on the ballistic behavior and failure mechanisms at different temperatures. It also reviews analytical and numerical models, as well as empirical equations proposed in previous works. Further investigation is needed to validate the applicability of these equations.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Engineering, Mechanical
Zhipeng Gao, Hai Zhang, Jian Zhao, Dong Ruan
Summary: This paper investigates the enhanced crushing performance of bio-inspired hierarchical multi-cell hexagonal tubes (BHMH) through numerical analysis and theoretical prediction, showing improved peak crushing force and energy absorption compared to traditional hexagonal tubes.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Mahadi Hasan, Md Ashraful Islam, Zhenyi Huang, Jingwei Zhao, Zhengyi Jiang
Summary: Successful bonding between cemented tungsten carbide and steel was achieved using the spark plasma sintering (SPS) technique. The results show that increasing the holding time at 1000 degrees C improves the bonding strength.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Zhipeng Gao, Dong Ruan, Hai Zhang, Jian Zhao, Zhanyuan Gao, Zhixin Huang
Summary: This paper conducts a systematic finite element analysis study to evaluate the effects of two main simulation techniques on the deformation modes and force-displacement curves of thin-walled tubes. By carrying out axial compressive tests on three types of thin-walled circular tubes with different geometrical parameters, and developing finite element models, the influences of indentation triggers and buckling modes are explored. The study finds that a suitable simulation technique can accurately mimic the deformation mode and corresponding force-displacement curve for thin-walled circular tubes.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2023)
Article
Green & Sustainable Science & Technology
A. L. Herring, C. Sun, R. T. Armstrong, M. Saadatfar
Summary: Residual trapping is essential for the security and sustainability of geologic sequestration operations. Recent experiments indicate that cycles of scCO2 and brine injections can cause surface chemistry reactions, enhancing residual trapping. This study uses X-ray microcomputed tomography to investigate the alteration mechanism and provides new insights into the conditions under which wettability alteration affects scCO2 flow and trapping.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Article
Engineering, Civil
Chamini Rodrigo, Shanqing Xu, Yvonne Durandet, Darren Fraser, Dong Ruan
Summary: This paper experimentally investigated the quasi-static and dynamic compressive behaviors of functionally graded (FG) lattices made of stainless steel (SS 316L) by electron beam melting (EBM). The results showed that the bi-directional density graded lattices witnessed the highest plateau stress and energy absorption capacity. Finite element modelling further studied the deformation pattern and stress distribution, showing that the enhanced strength and energy absorption were related to the periodic collapse of graded structures corresponding to the density gradient strategy. Parametric studies were conducted to examine the influence of density gradient on the dynamic response of FG lattices using the experimentally validated FEM models.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Zhipeng Gao, Hai Zhang, Jian Zhao, Ying Zhang, Dong Ruan
Summary: In this study, thin-walled aluminum square tubes with different wall thickness configurations were experimentally compressed at various loading angles. Numerical analysis was also conducted to investigate the effects of wall thickness, thickness configuration, and loading angle on the deformation mode and energy absorption of the tubes. The results showed that tubes with opposite walls of different thicknesses exhibited better energy absorption performance under oblique loading, while tubes with opposite walls of the same thickness absorbed the most energy at larger angles.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Krishna Prasath Logakannan, Dong Ruan, Jayaganthan Rengaswamy, S. Kumar, Velmurugan Ramachandran
Summary: Fracture occurs in cellular structures due to localized complex stress and/or strain state, making it difficult to accurately predict failure using traditional testing methods and finite element analysis. The build orientation of different ligaments also significantly affects the macroscopic performance of cellular structures. In order to improve numerical predictions, the failure strain should be considered in relation to stress triaxiality and build orientation. Experimental determination of fracture loci in AlSi10Mg alloy fabricated using Laser Powder Bed Fusion (LPBF) for different build orientations helps in developing predictive capabilities. Numerical models considering triaxial fracture loci provide more accurate predictions of deformation mode and fracture location in re-entrant structures compared to models that assume simple uniaxial tensile failure.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Shakib Hyder Siddique, Paul J. Hazell, Gerald G. Pereira, Hongxu Wang, Juan P. Escobedo, Ali A. H. Ameri
Summary: This paper investigates the stiffness and energy absorption capabilities of biomimetic structures based on the internal architecture of a cornstalk. The specimens were manufactured using 3D printing and a tough thermoplastic material. Compression tests were performed to extract various parameters, and a numerical model was developed to analyze the behavior of the structures. The results showed that the cornstalk-inspired biomimetic structure had a significantly higher specific energy absorption capability compared to other designs.
Article
Materials Science, Multidisciplinary
Chamini Rodrigo, Shanqing Xu, Yvonne Durandet, Darren Fraser, Dong Ruan
Summary: This study investigates the flexural behavior of different types of lattice beams and finds that bidirectional lattice beams have higher flexural stiffness and strength compared to uniform and unidirectional lattice beams. The lower strength of unidirectional lattice beams is attributed to the easier collapse of thinner lattice layers on the impact side. Furthermore, the parametric study reveals that the flexural stress and specific energy absorption capacity of bidirectional lattice beams can be enhanced by manipulating the layer density gradient.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Bing Leng, Dong Ruan, Shanqing Xu, Kwong Ming Tse
Summary: This study explores the feasibility of using a structure inspired by horsetail and human spine features as a potential helmet liner to mitigate acceleration-induced injuries. Experimental and numerical evaluations were conducted to assess the compressive and shear performance of the new horsetail liner structure, as well as the material characteristics of expanded polystyrene foam and thermoplastic polyurethane. A parametric study was also conducted to determine the optimal design configuration of the horsetail liner structure. The results demonstrate that the bioinspired horsetail structure is effective in reducing both linear and rotational accelerations.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Manufacturing
Hari Bahadur Dura, Paul J. Hazell, Hongxu Wang, J. P. Escobedo-Diaz
Summary: A biomimetic protective beam inspired by curved elasmoid fish scales was studied using numerical and experimental approaches to investigate its bending stiffness properties. The results show that the bioinspired design has improved flexural stiffness compared to the baseline design, and scales with smaller radii exhibit greater structural resilience, which is suitable for the design of protective structures for low-velocity impact applications.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Review
Engineering, Manufacturing
Arcade Serubibi, Paul J. Hazell, Juan Pablo Escobedo, Hongxu Wang, Ebrahim Oromiehie, Gangadhara B. Prusty, Andrew W. Phillips, Nigel A. St John
Summary: Recent advances in automated manufacturing of composite structures have sparked renewed interest in fibre metal laminates (FMLs) across various engineering sectors. FML structures, which combine metal plates and composite laminates, are increasingly being utilized for their excellent mechanical properties and cost-effectiveness in withstanding impact and blast loading. This review paper consolidates recent publications to provide an overview of the behavior of FML structures under impact and blast loading, compares existing techniques for assessing failure mechanisms, discusses numerical modeling approaches applicable to heterogeneous structures, and presents innovative designs to enhance the energy absorption capability and damage tolerance of FML structures.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Instruments & Instrumentation
Amer Alomarah, Zahraa A. Al-Ibraheemi, Dong Ruan
Summary: This study proposes an auxetic stent called RCA, which has controllable auxetic features by adjusting geometric parameters and the number of unit cells. The experimental and numerical results show that the RCA stents have remarkable radial expansion capabilities and exhibit different deformation patterns.
SMART MATERIALS AND STRUCTURES
(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)
