Article
Engineering, Manufacturing
Shuai Zhang, Qiang Gao, Yu Zhang, Xianzhe Sheng, Zhenyun Miao, Jianbin Qin, Guangcheng Zhang, Xuetao Shi
Summary: This paper combines 3D printing with supercritical CO2 foaming technology to develop a novel strategy for manufacturing lightweight hierarchical structures. By adjusting the printing parameters, the thickness of the shell layer and the size of the core layer's cells can be changed, thereby improving the mechanical properties and energy absorption efficiency of the printed foam, and it has a broad range of applications.
ADDITIVE MANUFACTURING
(2023)
Article
Polymer Science
Weidong Chen, Chengjie Guo, Xiubin Zuo, Jian Zhao, Yang Peng, Yixiao Wang
Summary: This investigation focuses on studying the impact of temperature and damage constitutive model on the energy absorption performance of polymeric origami tubes under quasi-static conditions. The study includes experimental characterization of the mechanical properties of 3D-printed polylactic acid (PLA) samples at different temperatures and numerical simulations to analyze the influence of temperature on axial compression behavior.
Article
Chemistry, Multidisciplinary
Xinwei Li, Xiang Yu, Jun Wei Chua, Heow Pueh Lee, Jun Ding, Wei Zhai
Summary: The advancement of 3D printing technology has led to the development of microlattice metamaterials with excellent sound and mechanical energy absorption capabilities. High sound absorption coefficients and specific energy absorption have been measured, with absorption mechanisms and limitations being proposed.
Article
Mechanics
Amin Farrokhabadi, Mohammad Mahdi Ashrafian, Amir Hossein Behravesh, Seyyed Kaveh Hedayati
Summary: This paper presents an evaluation of two techniques to improve the energy absorption capability of an accordion cellular structure with close-to-zero Poisson's ratio. The results show that both fiber reinforcement and foam filling methods significantly enhance the stiffness, collapse stress, and plateau stress of the structure, resulting in structures with higher specific energy absorption and lower density.
COMPOSITE STRUCTURES
(2022)
Article
Instruments & Instrumentation
Luonan Zhou, Xiaoyang Zheng, Kai Du, Xiaofeng Guo, Qiang Yin, Ai Lu, Yong Yi
Summary: Auxetic lattices with negative Poisson's ratio are seen as potential candidates for sensors, actuators, and optics due to their unique mechanical responses. By designing four types of auxetic lattices based on hollow shell cuboctahedron assembly, experiments and finite element simulations were used to investigate their behavior under uniaxial compression. The results showed that these lattices exhibit buckling with negative Poisson's ratio over a range of volume fractions, and demonstrate high reversibility in compressive loadings, providing insight into energy absorption applications such as body protection equipment and smart packaging materials.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Chemistry, Analytical
Jiajing Dong, Songtao Ying, Zhuohao Qiu, Xixi Bao, Chengyi Chu, Hao Chen, Jianjun Guo, Aihua Sun
Summary: Dual-material 3D printing technology can improve the toughness and rebound resilience of Auxetic re-entrant honeycomb structures, and a curved re-entrant honeycomb structure has been introduced to enhance stiffness. The study found that dual-material printed structures showed later densification phase and better overall integrity.
Article
Polymer Science
Xiubin Zuo, Chengjie Guo, Weidong Chen, Yixiao Wang, Jian Zhao, Huanlin Lv
Summary: In this study, fused filament fabrication (FFF) 3D printing was used to fabricate origami-ending tubes (OET) and investigate the influence of loading rate and temperature on their energy absorption capacity. Experimental and numerical simulation results showed that different constitutive models were needed for capturing the true stress-strain behavior of the material at different temperatures. A damage model was established to predict the collapse and damage behavior of the tubes under different loading rates. The study analyzed the impact of loading rate and temperature on the crashworthiness performance of the OET tubes.
Article
Mechanics
Richard J. Nash, Yaning Li
Summary: The shear resistance of bio-inspired suture joints with different waviness is explored using an integrated experimental and numerical approach. Polymeric single lap shear specimens with different waviness are designed and fabricated via multi-material additive manufacturing. Results show that the 3D printed suture joints fail under combined adhesive and cohesive failure mechanisms.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Abdalsalam Fadeel, Hasanain Abdulhadi, Golam Newaz, Raghavan Srinivasan, Ahsan Mian
Summary: Sandwich structures are widely used due to their light weight, high specific strength, and high specific energy absorption. Finite element analysis (FEA) can be used to predict the mechanical behavior of lattice cell structures (LCSs) more economically. However, there are limitations in current FEA models for predicting post-yielding stages of 3D-printed LCSs. This study focuses on developing FEA models to accurately capture the post-yielding compressive behavior of different LCSs and comparing the results with experimental observations.
JOURNAL OF COMPUTATIONAL DESIGN AND ENGINEERING
(2022)
Article
Engineering, Manufacturing
Ross Johnston, Zafer Kazanci
Summary: This study compares the effects of different material combinations on the performance of cellular structures, finding that single-material structures perform best in single loading cycle situations, while multi-material structures are suitable for situations requiring multiple loading cycles. Introducing materials with varying stiffnesses into specific regions within the structure can modify the Poisson's ratio during compression, improving overall performance.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Mechanical
Anbang Qu, Fanchun Li
Summary: This study analyzes the influence of 3D printing on the fatigue crack propagation life of a compressor impeller with a pressure ratio less than 3 under the combined action of 3D printing residual stress and external load. The impeller is printed using selective laser melting (SLM) technology and finite element method (FEM) is used to simulate the 3D printing process and analyze the residual stress and deformation. The results show that the research provides a basis for damage tolerance analysis of 3D printing compressor impeller and can serve as a reference for maintenance work.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Manufacturing
Chiara Zarna, Gary Chinga-Carrasco, Andreas T. Echtermeyer
Summary: The major advantage of cellular structures is the saving of material, energy, cost, and weight. Biocomposites are strong, lightweight materials and offer a high degree of design freedom. This study characterized and compared the bending properties of different cellular structures for use in wood fiber/PLA biocomposite panels.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Green & Sustainable Science & Technology
Gabriel Mansour, Vasileios Papageorgiou, Maria Zoumaki, Konstantinos Tsongas, Michel T. Mansour, Dimitrios Tzetzis
Summary: The objective of this research is to improve the physical properties of artificial sandstone for 3D printing of environmentally friendly architectural structures. Both cylindrical and cellular samples were used to investigate the suitability and mechanical properties of starch-based sandstone material. The 3D-printed artificial starch-sandstone material exhibited satisfactory mechanical properties.
Article
Materials Science, Multidisciplinary
Ryan Nam, Michael Jakubinek, Hamed Niknam, Meysam Rahmat, Behnam Ashrafi, Hani E. Naguib
Summary: Tunable energy absorption achieved through grading of lattice structures has high potential for lightweight cellular cores in energy absorbing structures. This study investigates structurally graded and multi-material lattices consisting of plate-based octet unit cells, showing a near 10% increase in specific energy absorption in the plate thickness graded designs compared to baseline octet lattices. Finite element models were developed and showed good agreement with experimental results. The results demonstrate the capacity to adapt the octet lattice structure design through additive manufacturing to better suit the expected load and application.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Fatemeh Ghorbani, Hussain Gharehbaghi, Amin Farrokhabadi, Amir Bolouri, Amir Hossein Behravesh, Seyyed Kaveh Hedayati
Summary: This article proposes glass-fiber-reinforced bone-inspired cellular structures to enhance energy absorption capability. The elastic modulus of the bone-inspired unit cell is analytically obtained and employed in Particle Swarm Optimization algorithm for optimizing cellular structures. The fabricated structures show improved energy absorption performance compared to the un-reinforced structure.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Anatomy & Morphology
R. Rzeplinski, M. Slugocki, M. Kwiatkowska, S. Tarka, M. Tomaszewski, M. Kucewicz, K. Karczewski, P. Krajewski, J. Malachowski, B. Ciszek
Summary: The aim of this study was to assess the ability of standard CT images to visualize perforating arteries and compare it with microscopic and micro-CT pictures. The results showed that standard CT failed to clearly visualize branching points and vessels smaller than 0.25-0.5 mm in diameter. Therefore, compared to micro-CT, CT has quantitative and qualitative flaws in imaging perforating arteries.
FOLIA MORPHOLOGICA
(2023)
Article
Computer Science, Interdisciplinary Applications
Joanna Szkutnik-Rogoz, Jerzy Malachowski, Jaroslaw Ziolkowski
Summary: The aim of this study was to develop an innovative solution using the Laplace transform and the R programming language to determine the reliability measure of a system. A mathematical model based on the theory of reliability was established, and actual numerical data were used for calculations and analyses. An algorithm utilizing the Laplace transform was proposed to evaluate the system's reliability. Results showed that the proposed algorithm simplified complex calculations and allowed for visualization of results, making it a universal and cost-effective solution for determining reliability characteristics.
COMPUTERS & INDUSTRIAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Mateusz Oszczypala, Jaroslaw Ziolkowski, Jerzy Malachowski
Summary: This research paper discusses the implementation of a 3-state semi-Markov model for reliability analyses in military vehicles. The model was validated using empirical data and provided insights into the conditional probabilities of state transitions and time distribution functions. The Laplace transform was employed to determine various reliability parameters, including the failure probability density function and the expected time to failure. The readiness index values were also calculated based on ergodic probabilities.
EKSPLOATACJA I NIEZAWODNOSC-MAINTENANCE AND RELIABILITY
(2023)
Article
Energy & Fuels
Mateusz Oszczypala, Jaroslaw Ziolkowski, Jerzy Malachowski
Summary: This research paper discusses the operation process of the Honker 2000 light utility vehicles in the Polish Armed Forces transport system. The study identifies four states of the vehicle's operation process and develops a simulation model using Monte Carlo methods to analyze changes in operational states. The results show that the proposed simulation system is a useful tool in analyzing the current operation process and making forecasts.
Article
Engineering, Mechanical
Michal Kucewicz, Pawel Baranowski, Lukasz Mazurkiewicz, Jerzy Malachowski
Summary: This paper provides a detailed comparison study of three selected material models in hydrocodes for understanding the behavior of rock under blast-and shock-induced loadings. The JH-2 model is selected based on the comparison study to simulate a representative blast in a mining face, demonstrating its efficiency in the simulation of drilling and blasting.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Chemistry, Analytical
Natalia Daniel, Kamil Sybilski, Wojciech Kaczmarek, Dariusz Siemiaszko, Jerzy Malachowski
Summary: This study found a positive correlation between sEMG and fNIRS signals during dynamic movements, which is influenced by the type of exercise and lifestyle. The correlation between EMG and NIRS signals was higher in participants with a more active lifestyle.
Article
Chemistry, Physical
Piotr Sawczuk, Janusz Kluczynski, Bartlomiej Sarzynski, Ireneusz Szachogluchowicz, Katarzyna Jasik, Jakub Luszczek, Krzysztof Grzelak, Pawel Platek, Janusz Torzewski, Marcin Malek
Summary: The paper presents the analysis results of regeneration possibilities for a damaged slider repaired by additive manufacturing technology. The study demonstrates the high quality of the connection zone between the original part and the regenerated zone. Hardness measurements reveal a significant increase, 35%, in the interface between the two materials when using M300 maraging steel for regeneration. Furthermore, digital image correlation technology is utilized to identify the area with the largest deformation during the tensile test, which is outside the connection zone between the two materials.
Article
Chemistry, Multidisciplinary
Marcin Konarzewski, Robert Panowicz, Adam Jeschke
Summary: The recent military missions highlight the significance of protecting vehicles and their occupants from mines and IEDs. Various active and passive solutions can be employed for this purpose. Energy deflectors, particularly the double-bend and semi-spherical types, are popular solutions that effectively dissipate the energy from explosive charges and reduce blast wave loading. Experimental and numerical analyses demonstrated the improved effectiveness of these deflectors compared to the traditional V-shaped deflectors.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Mateusz Oszczypala, Jaroslaw Ziolkowski, Jerzy Malachowski, Aleksandra Legas
Summary: The article discusses the issue of modelling traffic flows and the transport network. The authors developed a model of the road network in the north-eastern part of the Warsaw agglomeration based on the proposed algorithm. Two methods, the Nash equilibrium and the Stackelberg approach, were used to optimize the distribution of traffic flows. The study concluded that an increase in traffic volumes could result in a decrease in traffic volumes on some links of the road network, highlighting the complexity of the transport system.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Industrial
Mateusz Oszczypala, Jakub Konwerski, Jaroslaw Ziolkowski, Jerzy Malachowski
Summary: This article discusses the issues related to the redundancy of k-out-of-n structures and proposes a probabilistic and simulation-based optimization method. The method was applied to real transport systems, demonstrating its effectiveness in reducing costs and improving system availability and performance.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2024)
Article
Chemistry, Physical
Janusz Kluczynski, Katarzyna Jasik, Jakub Luszczek, Bartlomiej Sarzynski, Krzysztof Grzelak, Tomas Drazan, Zdenek Joska, Ireneusz Szachogluchowicz, Pawel Platek, Marcin Malek
Summary: In this study, the research compared 316L steel manufactured using two commercially available additive manufacturing (AM) techniques: Material Extrusion (MEX) and Laser Powder Bed Fusion of Metals (PBF-LB/M). The investigation involved determining the density, surface roughness, microstructures, and hardness of the printed samples. The research revealed that PBF-LB/M samples had lower porosity and higher hardness compared to MEX samples.
Article
Engineering, Biomedical
Pawel Platek, Natalia Daniel, Kamil Cieplak, Marcin Sarzynski, Przemyslaw Sieminski, Bartosz Sadownik, Pawel Andruszkiewicz, Lukasz Wroblewski
Summary: The paper discusses the design and findings of a helmet for non-invasive oxygen therapy called hCPAP, using positive pressure. PET-G filament and FFF 3D printing were used for production, and a parameter identification method for 3D printing was proposed to reduce time and costs. The rapid development of the hCPAP device through 3D printing enabled successful preclinical testing and treatment of Covid-19 patients. This approach significantly reduced time and costs while providing customized solutions in the fight against the pandemic.
MEDICAL DEVICES-EVIDENCE AND RESEARCH
(2023)
Article
Engineering, Multidisciplinary
Joanna Szkutnik-Rogoz, Jerzy Malachowski
Summary: This paper presents a solution to a transport problem using classical computation methods and develops algorithms that can optimize transport costs in three different computing environments. The paper involves determining decision variables, indicating limiting conditions, and interpreting and visualizing the obtained results.
BULLETIN OF THE POLISH ACADEMY OF SCIENCES-TECHNICAL SCIENCES
(2023)
Article
Engineering, Civil
Jian Xue, Weiwei Zhang, Jing Wu, Chao Wang, Hongwei Ma
Summary: This study integrates a plate-type local resonator with varying free boundaries within a plate to convert the initial low-order global vibration modes into localized vibration modes. A novel semi-analytical method is proposed to analyze the free vibration of the plate with thickness and displacement discontinuities. The results show that by applying free boundary conditions, the low-order localized vibration frequencies can be significantly reduced without affecting the low-order global frequencies.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Merve Tunay
Summary: In recent years, there has been an increasing number of studies on the mechanical properties of sandwich structures manufactured with the Fused Deposition Modeling (FDM) method. However, there is still a lack of experimental data on the mechanical characteristics of FDM-manufactured sandwich structures under different thermal aging durations. In this experiment, the energy absorption capabilities of sandwich structures with different core geometries were investigated under various thermal aging durations. The results showed that the core topology significantly influenced the energy absorption abilities of the sandwich structures.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Zi-qin Jiang, Zi-yao Niu, Ai-Lin Zhang, Xue-chun Liu
Summary: This paper proposes a crosssection corrugated plate steel special-shaped column (CCSC) that improves the bearing capacity and overall stability of structural columns by using smaller material input. Through theoretical analysis and numerical simulation, the overall stability of the CCSC under axial compression is analyzed. The design method and suggestions for the stability of CCSC are put forward. Compared with conventional square steel tube columns, the CCSC has obvious advantages in overall stability and steel consumption.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yong Zhang, Yangang Chen, Jixiang Li, Jiacheng Wu, Liang Qian, Yuanqiang Tan, Kunyuan Li, Guoyao Zeng
Summary: A hybrid TPMS method was proposed to develop a new TPMS structure, and the mechanical properties of different TPMS structures were studied experimentally and numerically. Results showed that the hybrid TPMS structure had higher energy absorption and lower load-carrying capacity fluctuation. Further investigations revealed that the topological shape and material distribution had significant influence on mechanical properties, and the hybrid additive TPMS structure exhibited significant crashworthiness advantage in in-plane crushing condition.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Tongfei Sun, Ye Liu, Kaoshan Dai, Alfredo Camara, Yujie Lu, Lijie Wang
Summary: This paper presents a series of experimental and numerical studies on the performance of a novel double-stage coupling damper (DSCD). The effects of damper configuration, friction-yield ratio (Rfy), and loading protocol on the hysteresis performance of the DSCD are investigated. The test results demonstrate that the arrangement of ribs in the DSCD increases its energy dissipation capacity. Numerical analysis reveals that the length of the friction mechanism and the clearance between the yield segment and the restraining system affect the energy dissipation and stability of the damper.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Jeonghwa Lee, Young Jong Kang
Summary: This study investigates the local buckling behavior and strength of I-shape structural sections by considering flange-web interactions through three-dimensional finite element analysis. The study provides a more reasonable estimation of local buckling strength by considering the ratio of flange-web slenderness and height-to-width ratio, and presents design equations for flange local and web-bend buckling coefficients.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yizhe Chen, Wenfeng Xiang, Qingsong Zhang, Hui Wang, Lin Hua
Summary: This study investigates the surface modification of a nickel plate to improve the bonding strength with carbon fiber-reinforced plastics (CFRP). The results show that different surface modification methods, including sandblasting, coupling agent treatment, and compound coupling agent treatment, significantly enhance the bonding strength of CFRP/Ni joints. The research provides insights into improving the connection between nickel and CFRP, as well as other heterogeneous materials.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Agha Intizar Mehdi, Fengping Zhang, Moon-Young Kim
Summary: A spatial stability theory of mono-symmetric thin-walled steel beams pre-stressed by spatially inclined cables is derived and its validity is demonstrated through numerical examples. The effects of initial tension, deviator numbers, inclined cable profiles, and bonded/un-bonded conditions on lateral-torsional buckling of the pre-stressed beams are investigated, with a specific emphasis on the effects of increasing initial tension.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Teng Ma, Jinxiang Wang, Liangtao Liu, Heng Li, Kui Tang, Yangchen Gu, Yifan Zhang
Summary: The structural response of water-back plate under the combined action of shock wave and bubble loads at water depths of 1-300 m was numerically investigated using an arbitrary Lagrange-Euler method. The accuracy of the numerical model was validated by comparing with experimental and theoretical results. The influences of water depth and length-to-diameter ratio of the charge on the combined damage effect were analyzed. The results show that as water depth increases, the plastic deformation energy of the water-back plate decreases, and the permanent deformation mode changes from convex to concave. When the charge has a large length-to-diameter ratio, the plastic deformation energy of the radial plate is higher than that of the axial plate, and the difference decreases with increasing water depth. Increasing the length-to-diameter ratio enhances the combined damage effect in the radial direction in deep-water environments.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiu-Yun Li, Ben Young
Summary: This paper investigates the flexural performance of CFS zed section members bent about the neutral axis parallel to the flanges through experimental and numerical analysis. The results show that the current direct strength method generally provides conservative predictions for the flexural strength of unstiffened zed section members, but slightly unconservative design for edge-stiffened zed section beams. The nominal flexural strengths of zed section members with edge stiffeners were found to be underestimated by 17% to 21% on average. Modified DSM formulae are recommended for the design of CFS zed section beams.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Weinan Gao, Bo Song, Xueyan Chen, Guochang Lin, Huifeng Tan
Summary: This paper presents a precise method for predicting deformation in large-scale inflatable structures, utilizing finite element modeling and laser scanning technique. The study shows a good agreement between the predictive model and non-contact measurement results.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Fei Gao, Zongyi Wang, Rui Zhu, Zhenming Chen, Quanxi Ye, Yaqi Duan, Yunlong Jia, Qin Zhang
Summary: This research investigates the mechanical properties of high-strength ring groove rivet assemblies and the load resistances of riveted T-stubs. Experimental tests reveal that Grade 10.9 rivets have higher yield strength and strain, and lower ultimate strain, making them suitable for high-strength ring groove rivet connections. Increasing the rivet diameter benefits the T-stubs, while increasing the flange thickness is not always advantageous. The Eurocode 3 method is not suitable for T-stubs connected through ring groove rivets, while the Demonceau method is conservative.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Shangchun Jiang, Liangfeng Sun, Haifei Zhan, Zhuoqun Zheng, Xijian Peng, Chaofeng Lue
Summary: This study investigates the bending behavior of two-dimensional nanomaterials, diamane and its analogous structure TBGIB, through atomistic simulations. It reveals that diamane experiences structural failure under bending, while TBGIB bends elastically before undergoing structural failure. The study provides valuable insights for the application of these materials in flexible electronics.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiang Zhang, Jianian Wen, Qiang Han, Hanqing Zhuge, Yulong Zhou
Summary: In this study, the mechanical properties of Q690 steel H-section columns under bi-directional cyclic loads are investigated, considering the time-varying characteristics of corrosion. A refined finite element (FE) model is built to analyze the degradation of mechanical property and failure mechanisms of steel columns with different design parameters during the whole life-cycle. The study proposes a quantitative calculation method for the ultimate resistance and damage index of steel columns, taking into account the ageing effects. The findings emphasize the importance of considering the ageing effects of steel columns in seismic design.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yuda Hu, Qi Zhou, Tao Yang
Summary: The magneto-thermo-elastic coupled free vibration of functionally graded materials cylindrical shell is investigated in this study. The vibration equation in multi-physical field is established and solved using the Hamilton principle and the multi-scale method. The numerical results show that the natural frequency is influenced by various factors such as volume fraction index, initial amplitude, temperature, and magnetic induction intensity.
THIN-WALLED STRUCTURES
(2024)