Article
Construction & Building Technology
Zhijie Huang, Wensu Chen, Hong Hao, Roland Aurelio, Zhixing Li, Thong M. Pham
Summary: This study investigates the dynamic compressive and splitting tensile properties of ambient-cured geopolymer concrete (GPC) using split Hopkinson pressure bar (SHPB). The results show that ambient-cured GPC exhibits strain rate sensitivity, with the dynamic increase factor (DIF) increasing with strain rate. The specific energy absorption of ambient-cured GPC under dynamic compression increases linearly with strain rate.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Kavita Ganorkar, M. D. Goel, Tanusree Chakraborty
Summary: Basalt fiber-reinforced concrete (BFRC) was dynamically characterized using a split Hopkinson pressure bar (SHPB), showing an increase in concrete strength with increasing strain rates. The dynamic increase factor (DIF) was found to range from 0.91 to 3.58 at different strain rates.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Qinglong Qin, Qingshan Meng, Qinghai Mei, Kai Wu, Chi Wang, Jiwang Zhang
Summary: In this study, the dynamic response characteristics of coral reef sand concrete (CRSC), CRSC with polypropylene fibers (PFs), and CRSC with basalt fibers (BFs) under impact loading were compared using macroscopic and microscopic testing techniques. The results showed that the dynamic compressive strength and dynamic increase factor (DIF) of CRSC increased with increasing strain rate. PFs and BFs improved the dynamic compressive strength at medium and low strain rates. The damage modes of the different types of concrete were fragmentation damage for CRSC and CRSC with BFs, and core retention damage for CRSC with PFs.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Mechanical
A. Francisco G. Tenreiro, Carlos M. Silva, Antonio M. Lopes, Paulo D. P. Nunes, Ricardo J. C. Carbas, Lucas F. M. da Silva
Summary: This paper presents a novel pneumatic actuation system for a Split Hopkinson Pressure Bar (SHPB) test machine, capable of testing adhesive bulk and various adhesive joint specimina. The actuator dynamics is assessed through a functional numerical simulation, and the mechanical design of the non-conventional actuator is discussed, highlighting construction details.
MECHANISM AND MACHINE THEORY
(2021)
Article
Construction & Building Technology
Xing Chen, Changzhong Wang, Suwen Chen, Siyi Yi, Yong Lu
Summary: Low-iron ultra-clear float glass (LIFG) has become popular in landmark and large-scale buildings for its aesthetic characteristics. This paper investigates the dynamic mechanical properties of LIFG for blast resistance design by conducting quasi-static and dynamic tests. The results show that the dynamic compressive and tensile strengths of LIFG are strain-rate dependent, with the tensile strength being more sensitive to strain rate. The strain rate effect does not significantly affect the Young's modulus of LIFG.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sanshan Chen, Feng Chen, Chengjie Zheng, Zhengyu Wu
Summary: The addition of ferronickel slag powder can enhance the impact resistance of soil-cement, and the dynamic stress gradually increases with curing age.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Construction & Building Technology
Shu-Hua Xiao, Sheng-Jin Liao, Gen-Quan Zhong, Yong-Chang Guo, Jia-Xiang Lin, Zhi-Hong Xie, Ying Song
Summary: This study investigates the dynamic behavior of PFRGC under SHPB test. The effects of different contents of low-calcium fly ash and PVA fibers on the dynamic mechanical properties of PFRGC are studied. Experimental results show that the energy absorption of PFRGC decreases significantly with a PVA fiber volume content of 1.2% at the same strain rate.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Chemistry, Physical
Selim Kim, Dong Geun Kim, Minu Kim, Ki Jong Kim, Jae Min Lee, Joon Hyuk Lee, Hae-Won Cheong, Hyoung Seop Kim, Sunghak Lee
Summary: Various Al foams have been developed to meet the increasing demands for impact reduction in military, automotive, civil-engineering, and aerospace applications. Evaluating their energy-absorbing performance is challenging due to the rapid closure of interior pores. This study modified a split Hopkinson pressure bar (SHPB) to reliably evaluate the energy-absorbing performance of open- and closed-cell Al foams using the incident wave alone.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Selim Kim, Hyungu Kang, Minu Kim, Ki Jong Kim, Jae Min Lee, Hae-Won Cheong, Hyoung Seop Kim, Sunghak Lee
Summary: This study suggests that stacks of thin aluminum sheets with fine rectangular or triangular grooves are effective materials for energy absorption. The energy-absorbing performance of these materials was evaluated using a modified split Hopkinson pressure bar (SHPB). The study found that the grooves shape, groove cavity fraction, and specimen thickness affect the energy-absorbing parameters, including impact momentum and maximum impact acceleration. Both impact momentum and maximum impact acceleration showed a continuous decrease as the specimen thickness increased or as the groove cavity fraction increased. The triangular grooved specimens exhibited greater reduction in impact momentum compared to the rectangular grooved specimens. The overall energy-absorbing performance of the triangular grooved specimens was better than that of the rectangular grooved specimens. Notably, in the triangular grooved specimens with a high cavity fraction, the triangular embossing intruded into the groove cavities, resembling a 'zipper' mechanism, further enhancing the effectiveness of energy absorption. This study presents a promising approach for developing grooved aluminum sheet stacks with reduced impact momentum and maximum impact acceleration by exploring suitable groove shapes, cavity fractions, and stack thicknesses, especially in dynamically compressed artillery environments.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Energy & Fuels
Geli Zhao, Xing Li, Ying Xu, Kaiwen Xia
Summary: This study developed a novel experimental system to determine the dynamic compressive response of deep rocks, and validated the system using green sandstone. The experimental results showed that the dynamic compressive strength of the rocks is influenced by loading rate, confining pressure, and pore pressure. The most common dynamic failure modes were single shear failure and X-type conjugate shear failure. The friction angle remained constant while the cohesion depended on the loading rate. Water had a bidirectional effect on dynamic strength, facilitating crack propagation but also impeding pore structure damage.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Mathematics, Interdisciplinary Applications
S. F. Maassen, R. Niekamp, J. A. Bergmann, F. Poehl, J. Schroeder, P. Wiederkehr
Summary: The material point method (MPM) is an alternative discretization method for numerical simulations which combines the advantages of Lagrangian representation and Eulerian numerical solution approach. It is particularly useful for modeling high deformations, such as in granular materials in geo-mechanics. By introducing frictional contact in the Split-Hopkinson-Pressure-Bar (SHPB) experiment, the MPM method shows good convergence with finer discretizations and has demonstrated its importance as an alternative simulation technique for problems with high deformation.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Construction & Building Technology
Lei Xie, Xinjian Sun, Zhenpeng Yu, Zhixuan Guan, Anxiong Long, Huiheng Lian, Yaojie Lian
Summary: An experimental study was conducted to investigate the dynamic mechanical properties of basalt fiber reinforced concrete (BFRC) under different strain rates, fiber contents, and fiber lengths. The results showed that increasing strain rates significantly enhanced the compressive failure extent, compressive strength, and dynamic increase factor of BFRC. Under constant strain rates, the compressive strength, dynamic increase factor, and deformability of BFRC initially increased and then decreased with increasing fiber content or fiber length. The study provided valuable insights into the impact performance of BFRC and offered a basis for the design and analysis of BFRC structures under dynamic loads.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Hongshu Pan, Zhihong Xie, Gai Chen, Jiaying Su, Kexian Zhuo, Zhanbiao Chen, Jiaxiang Lin, Chang Feng, Yongchang Guo
Summary: This study investigates the effect of various fiber lengths on the dynamic compressive response of Engineered Geopolymer Composite (EGC). The results show that increasing the fiber length decreases the workability and compressive strength of EGC, but improves its tensile strength. EGC with 12 mm fibers exhibits the highest dynamic compressive strength and dynamic increase factor (DIF), along with superior energy absorption capability. A modified CEB-FIP model provides valuable guidance for optimizing EGC design and application.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Wanhui Feng, Yunchao Tang, Weiming He, Wenbo Wei, Yongmin Yang
Summary: The utilization of recycled rubber particles in concrete is a sustainable method that can improve strength and toughness. The study found that there is an enhanced strain-rate sensitivity of fracture toughness as the rubber content in the concrete increases.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Selim Kim, Min Cheol Jo, Dong Woo Suh, Hong Kyu Kim, Seok Su Sohn, Sunghak Lee
Summary: This study investigated the dynamic compressive properties of a high-strength bainitic steel with different austempering times, finding that the specimen austempered for 90 min exhibited the highest volume fraction of retained austenite (RA) and compressive properties. It showed high resistance to the formation of transformation-ASB (tASB) due to the active deformation-induced martensitic transformation of RA. The critical strain concept, correlated with dynamic compressive properties, was identified as an important factor in suppressing ASB formation and improving ballistic performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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)