Article
Engineering, Mechanical
Chris Fischer, Falk Haehnel, Klaus Wolf, Johannes Markmiller
Summary: Honeycomb cores made of phenol resin impregnated paper are commonly used in aircraft sandwich structures. The impact behavior of preloaded honeycomb sandwich structures is not well investigated. Experimental study shows that even low preloads lead to larger structural damage areas and lower residual strength.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2023)
Article
Mechanics
Mathilde Jean-St-Laurent, Marie-Laure Dano, Marie-Josee Potvin
Summary: The study found that the temperature during impact had almost no effect on the residual compressive strength of damaged sandwich panels, but did affect the damage induced by impact loading. The reduction in strength between pristine panels and those with the least amount of damage tested in the study was more significant than the effect of impact temperature on residual compressive strength.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Xia Zhou, Weihao Xu, Haili Zhou, Yan Zhang, Ping Wang, Zhiqi Gu, Yuanyuan Li
Summary: This study aims to improve the impact resistance of composite materials through hybrid structures. The effects of parameters such as hybrid fiber ratios and plying modes on the material were investigated. The results showed that the specimen with a fiber content of 15 g/m2 had the highest peak load and absorption energy. Specimens with different plying modes had the most significant effect on the maximum load.
POLYMER COMPOSITES
(2023)
Article
Construction & Building Technology
Ying Zhao, Zhaohan Yang, Tianlai Yu, Dabo Xin
Summary: This study investigates the dynamic behaviors, deformation and damage mechanisms, and energy absorption of aluminium foam sandwich structures subjected to low-velocity impact. Experimental and numerical analyses were conducted to evaluate the influences of face sheet thickness, core height, and density on the performance of energy absorption. The results show that the combination of impact energy and energy absorption indicators play a crucial role in the optimal design of sandwich structures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Mechanics
Jin Tian, Ting Xu, Lizhou An, Shuo Wang, Yefa Tan, Guanxiu Chen
Summary: The paper investigates the effects of hybrid effect and stacking configuration of carbon fiber and aramid fiber fabric on the properties of composite laminates. The ACACA laminated structure shows the best impact resistance and residual flexural property. Micro-CT analysis reveals the damage modes of the laminates under impact and post-impact flexural. The distribution of aramid fibers effectively reduces material damage caused by stress concentration.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Hangyu Lv, Shanshan Shi, Bingzhi Chen, Ziping Liu
Summary: This paper investigates the low-velocity impact performance of an orthogonal grid reinforced CFRP-foam sandwich structure at different positions. The intersection and rib positions showed fiber fracture, delamination, foam crushing, and cracking, while the center position exhibited face perforation and foam crushing. Numerical simulations were in good agreement with test results and discussed the damage processes at different stages. The lightweight, high impact resistant sandwich structure proposed provides a reference for structural design.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Mechanical
Hangyu Lv, Shanshan Shi, Bingzhi Chen, Jiaxin Ma, Zhi Sun
Summary: Grid structures have been added innovatively to honeycomb structures to form grid-honeycomb hybrid cores with great potential for engineering application. The impact response of composite sandwich structures with grid-honeycomb hybrid cores was investigated using experimental and numerical simulation. The results showed that the intersection had the highest impact resistance, with higher peak load, damage threshold load, and initial stiffness, and lower maximum displacement and residual displacement compared to the rib and center. Additionally, the grid thickness had a significant effect on impact resistance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Xuebei Teng, Yingjie Xu, Xinyu Hui, Weihong Zhang, Haicong Dai, Weiwei Liu, Chengyan Ma, Yujun Li
Summary: This paper presents an experimental investigation into the effect of Z-pin on the low-velocity impact response and flexural properties after impact of curved CFRP laminates. The experimental results demonstrate that Z-pin can provide an efficient crack arrest mechanism, reduce delamination damage projection area, and improve residual flexural strength.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Composites
Guangguang Zhang, Hangyan Wang, Qinghua Liu, Zhenfei Liu
Summary: In this study, a finite element model of composite corrugated sandwich structures was established using HyperMesh and LS-DYNA software and a progressive damage model was introduced. The impact resistance of the structures was studied by analyzing the projectile's residual velocity, the impact force on the target plate, and the failure mode. The results showed that the composite front panel/metal aluminium core/metal aluminium back panel sandwich structure exhibited better impact resistance than the all-metal aluminium corrugated sandwich structures, providing valuable reference for the design of novel lightweight multifunctional structures.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Yuechen Duan, Zhiren Zhan, Ting Zou, Ying Tie, Zhen Cui, Tingting Wang
Summary: The low-velocity impact resistance of the double-layer V-shaped aluminium folded sandwich structure was studied using the finite element method. The results showed that the double-layer structure had better impact stiffness and energy-absorbing capacity compared to the single-layer structure at low-velocity impact. Two methods were proposed to improve the impact stiffness of the double-layer structure, both of which were effective in increasing the stiffness and reducing the impact distance of the structure.
Article
Mechanics
Yuezhao Pang, Xiaojun Yan, Jia Qu, Linzhi Wu
Summary: This study prepared two types of foam/fiber sandwich structures using the Vacuum Assisted Resin Transfer Molding (VARTM) process and conducted low-velocity impact tests to investigate their force response, specific energy absorption, and failure modes under different impact energies, hammer shapes, and impact positions. The results showed that the corrugated sandwich structure exhibited superior low-velocity impact resistance compared to the flat sandwich structure, and performed best when impacted at the corrugated trough position.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Yun Wan, Bin Yang, Pengcheng Jin, Zhiqiu Zheng, Yonghu Huang
Summary: In this paper, a novel sandwich panel was manufactured using vacuum-assisted resin infusion process. The inclusion of wire nets in the facesheets significantly enhanced the energy absorb ability and compression-after-impact strength. The main damage modes during impact were fiber/wire nets breaking.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Polymer Science
Andrzej Komorek, Pawel Przybylek, Robert Szczepaniak, Jan Godzimirski, Marek Roskowicz, Szymon Imilowski
Summary: Composite materials, especially sandwich composites, are widely used in the construction of means of transport due to their low density and high stiffness. This study conducted static and dynamic tests to investigate the effect of density and core thickness on the mechanical properties of sandwich composites. The results showed that the core material significantly influenced the strength parameters of the composites, and different polymer foam cores had different adhesive properties. Thicker cores with higher density were found to improve the impact strength and puncture resistance of the sandwich composites.
Article
Engineering, Mechanical
Junzhen Chen, Long Cheng, Hongtai Sun, Xuming Yao, Chenchen Fu, Jianjun Jiang
Summary: This study investigates the influence of relative position and dimensional parameters of pin and impactor on foam core sandwich structure under low-velocity impact using experimental and computational approaches. It was found that the enhancement impact was substantial when the position parameters were below one and negligible when above three. The deformation and damage patterns of the pins transitioned from crushing to bending and micro-buckling with increasing position parameters. In addition, the position parameters had higher significance on maximum contact force, damage resistance, and perforation threshold energy, while the dimensional parameters had higher significance on dent depth.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
P. Mohammadkhani, S. S. Jalali, M. Safarabadi
Summary: This research investigated the effects of using steel wires on energy absorption of polyurethane foam core glass/epoxy skin sandwich panels through experimental and numerical methods, showing that the Star layout specimen is more effective in enhancing low-velocity impact behavior.
COMPOSITE STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)