Article
Materials Science, Multidisciplinary
Konstantina D. Karantza, Dimitrios E. Manolakos
Summary: This study investigates the crashworthiness behavior of square aluminum thin-walled tubes subjected to axial and oblique impact loading. It examines the effects of crushing angle and initial contact between impactor and tube on plastic collapse initiation and energy absorption capacity. The results show that a 5 degrees oblique cornered crushing yields the highest energy absorption, while an initial contact-in-corner case exhibits higher energy absorption compared to axial and edged oblique loading.
Article
Materials Science, Multidisciplinary
DucHieu Le, ThanhSon Doan, KimHoang Do, VanThanh Dang, Hoang Tu Pham, TrongNhan Tran
Summary: This research investigated multicellular structures made of acrylonitrile butadiene styrene and Polylactic Acid with various geometries. Experimental samples with a thickness of 1 mm were made using 3D printers and subjected to quasi-static loading. The LS-DYNA finite element software was used to simulate the structures and compare with experimental results. The study found that increasing the number of cells led to higher specific energy absorption and that the number of force peaks in samples with square cores corresponded to the number of cores.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2023)
Article
Engineering, Mechanical
Rusul M. AL-Khafaji, Sabah Auda AbdulAmeer, Ahmed Husain, Zuhair I. Al Mashhadani, Bashar M. Ali, Adnan Hashim Abdulkadhim, Zeid Fadel Albahash
Summary: In this research, the effect of thickness on the collapse characteristics of energy absorbers with compound cross sections was investigated and optimized. Numerical simulations were conducted using LS-DYNA software, with a total of 36 different modes simulated using ABS and PLA filaments. Quadratic polynomial functions were extracted for specific energy, maximum force, and crush force efficiency using the response surface method. The optimal conditions were found to be a rectangular thickness of 1 mm and an elliptical thickness of 3 mm for PLA absorbers, and ABS1-31 and ABS2-13 samples for ABS structures according to the optimization results.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Vivek Patel, Gaurav Tiwari, Ravikumar Dumpala
Summary: An experimental and numerical investigation was conducted to study the crashworthiness performance of layered frusta tube structures under axial impact loading. The study compared the failure modes and crashworthiness parameters of different multiwall frusta structures, and found that the three-layered frusta tube performed the best.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Engineering, Civil
Protesilaos K. Kostazos, Stavros S. A. Lykakos, Panagiotis-Aristotelis E. Kyritsis, Dimitrios E. Manolakos
Summary: This study investigated the crashworthiness performance of multi-walled (spiral) tubes fabricated by roll bending aluminum alloy sheets using experimental tests and numerical simulations. The results showed that the deformation patterns of spiral tubes were similar to closed-section tubes, with spirals collapsing progressively when exceeding two, and specific energy absorption improving with an increasing number of spirals, reaching peak values for around three to four spirals.
THIN-WALLED STRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Alessandro Polla, Giacomo Frulla, Enrico Cestino, Raj Das, Pier Marzocca
Summary: This article presents a numerical methodology for simulating advanced composite joints. The methodology is able to accurately predict the progressive damage and failure analysis of the joints under different loads. It offers a rational approach to designing damage-tolerance composite structures.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Electrical & Electronic
Konstantina D. Karantza, Ioannis G. Papantoniou, Stavros S. A. Lykakos, Dimitrios E. Manolakos
Summary: The study investigates the crashworthiness behavior of thin-walled circular steel tubes under axial and oblique crushing. Parametric analysis shows that increasing crushing angle leads to decreased energy absorption and peak force. Low-angled oblique loading is found to be the most efficient impact condition, achieving sufficient energy absorption and facilitating plastic collapse initiation. Additionally, higher wall thickness results in greater peak force and increased critical angle, preventing unstable deformation mode and providing smoother decrease of energy absorption with respect to loading angle.
Article
Materials Science, Composites
Rebecca A. Cutting, Anthony J. Favaloro, Johnathan E. Goodsell
Summary: This passage discusses the issues of element deletion in finite element analysis of brittle materials under axial compression and proposes a method of post-processing by connecting peak amplitudes of oscillations. The results indicate that an appropriately discretized model can adequately represent a continuum system.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Engineering, Manufacturing
Halil Ibrahim Yumrutas, Sedat Ozcanan, Mustafa Yurdabal Apak, Mohammed Jalil Anwer
Summary: This study investigates the crashworthiness performance of a newly developed F-shape type renewable hybrid barrier system consisting of wood, steel, and sand components. Through full-size crash testing and calibration, the performance of this system is compared to commonly used steel and concrete barriers. The results show that this barrier provides the comfort of a concrete barrier while performing similarly to a steel barrier in terms of safety.
INTERNATIONAL JOURNAL OF CRASHWORTHINESS
(2023)
Article
Materials Science, Composites
Suresh Paramasivam, Anish Jafrin Thilak Johnson
Summary: This work presents experimental and finite element simulations to investigate the behavior of unstiffened and anisogrid composite cylindrical shells under low-velocity axial impact. The study shows that the anisogrid model has a greater load-carrying capacity and lower weight compared to the unstiffened shell. The numerical simulation results are in good agreement with the experimental data.
POLYMER COMPOSITES
(2022)
Article
Engineering, Mechanical
Halil Ibrahim Yumrutas, Mustafa Yurdabal Apak
Summary: In recent decades, engineers and local authorities have placed significant emphasis on shielding risky/vulnerable roadside zones in urban areas from vehicular impacts. Bollard systems have been identified as an effective countermeasure, particularly in areas shared by vehicles and pedestrians. This paper investigates the performance of a steel bollard system through experimentally validated virtual crash tests, adhering to various standards. The results demonstrate that the bollard system has the capability to protect critical assets from vehicle impacts within certain speed limits.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Civil
Hasan Selim Sengel, Hakan Erol, Tolga Yilmaz, Ozgur Anil, Hasan Can Gurdal, Ahmet Muhammed Uludogan
Summary: This study investigates the behavior of RC slabs reinforced with Textile Reinforced Mortar (TRM) strips under sudden dynamic impact loading. The results show that double directional TRM strips significantly enhance the impact performance of RC slabs.
Article
Engineering, Manufacturing
Stavros Lykakos, P. K. Kostazos, D. E. Manolakos
Summary: This study investigates the crashworthiness performance of thin-walled tapered tubes with hybrid geometry (HG-tubes) through experimental and numerical analysis. The results show that HG-tubes outperform square tubes but not circular tubes in terms of energy absorption.
INTERNATIONAL JOURNAL OF CRASHWORTHINESS
(2022)
Article
Mechanics
R. Panciroli, O. Giannini
Summary: This paper aims to compare the impact resistance of natural fiber composites against a similar glass-fiber counterpart. Experimental study and numerical simulations provide insights on the major damage mechanism and the difference in impact resistance, mainly attributed to the lower fiber strength in natural fiber composites. Research suggests that modeling parameters could be utilized to improve the reliability of the numerical solution in terms of energy absorption during the impact.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Ibrahem Waleed, Ali Abdul Kadhim Ruhaima, Zainab A. Farhan, Nadia Salim Ismael, Muataz S. Alhassan, Makram Skikara, Zeid Fadel Albahash, Ahmed Najat Ahmed
Summary: This research focuses on thin-walled steel energy absorbers, which absorb energy through inversion, folding, and expansion processes. The absorbers consist of two end-capped frusta and a cylindrical shell. Experimental tests and simulations were conducted, and good agreement was observed between the results. The study examined the effects of lower frustum thickness, middle shell height, and frustum angle on energy absorption.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(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)
