Article
Materials Science, Multidisciplinary
Weisi Qin, Qinghua Yang, Yaolong He, Lifa Zhang, Hongjiu Hu
Summary: Polyethene oxide (PEO) is a promising material for solid electrolytes in lithium batteries due to its solubility, stability, flexibility, and low cost. However, the lack of understanding of PEO's mechanical behavior presents challenges in developing all-solid-state lithium batteries. This study investigates the mechanical properties of PEO-LiTFSI electrolytes through tensile tests and proposes a constitutive model that accurately predicts the stress-strain behavior. The results show that the mechanical response of PEO electrolytes can be influenced by factors such as temperature, LiTFSI content, and strain rate.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Xu He, Shaobing Wang, Yuexing Wang, Lu Liu, Yawei Dong, Yao Yao
Summary: The study investigates the viscoplastic behavior of solder material at different scales, focusing on the continuous accumulation of unrecoverable deformation in Sn-3.0Ag-0.5Cu alloy due to thermal stress at elevated temperatures. A novel phenomenological constitutive model is developed to describe the deformation of lead-free solder interconnections in microelectronic packaging, showing excellent numerical stability when compared with experimental data of bulk solder materials. Uniaxial compression experiments of spherical joint-scale granules were conducted to understand the strain-stress relationship, and the developed model accurately characterizes the viscoplastic compression deformation of Sn-3.0Ag-0.5Cu solder on joint-scale.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Solomon Hanson Duntu, Kenneth Hukpati, Iftikhar Ahmad, Mohammad Islam, Solomon Boakye-Yiadom
Summary: This study aims to enhance the fracture toughness of monolithic alumina ceramic by manipulating its microstructure with nanostructured materials. The results demonstrate that the addition of zirconia, graphene, and carbon nanotubes can significantly improve the fracture toughness and bending strength of the composites. Mechanisms such as pull-outs, crack arrest, and crack bridging by graphene and carbon nanotubes contribute to these enhancements.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Computer Science, Interdisciplinary Applications
Guo-qing Cai, Yan-lin Su, An-nan Zhou, Feng-jie Yin, Ye-hui Shi
Summary: This paper presents a novel elastic-viscoplastic constitutive model for reproducing the time-dependent behavior of unsaturated soil. The model combines the theoretical framework of the Unified Hardening model and the Barcelona Basic Model with Perzyna's overstress theory. It considers the effect of loading history and suction, and accurately describes the shear, dilatancy, and compression behaviors of unsaturated soil with different initial void ratios and stresses. Experimental data validates the capability of the proposed model in reproducing the time-dependent behavior of unsaturated soil or soft rock.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Materials Science, Multidisciplinary
Mariam Maisuradze, Min Li, Giuliana Aquilanti, Jasper Plaisier, Marco Giorgetti
Summary: Manganese Hexacyanoferrate (MnHCF) and MnHCF partially substituted with nickel were synthesized using a simple coprecipitation method. The physical and chemical properties were studied using various analysis techniques. The addition of nickel resulted in increased vacancies and water content inside the sample, as well as a change in the crystal structure.
Article
Computer Science, Interdisciplinary Applications
Yanlin Su, Guoqing Cai, Fengjie Yin, Yepeng Shan, Annan Zhou
Summary: This paper presents a novel elastic-viscoplastic constitutive model that takes into account particle breakage to reproduce the time-dependent behavior of coarse-grained soil. The model integrates the Unified Hardening (UH) model, the elastic-viscoplastic (EVP) model, and the overstress theory. The relationship between particle breakage and loading rate is established, and state variables associated with the critical state of coarse-grained soil are derived to consider both time and particle breakage. A three-dimensional elastic-viscoplastic constitutive model is constructed by combining a one-dimensional viscoplastic hardening parameter with a secondary consolidation coefficient considering particle breakage. The proposed model requires 19 parameters and effectively describes the influence of time-dependency and particle breakage on the shear, dilatancy, and compression behaviors of coarse-grained soil with different confining pressures or initial void ratios. Experimental data comparisons validate the model's ability to replicate the time-dependent behavior of coarse-grained soil.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Chemistry, Multidisciplinary
Shuo Feng, Rajesh Kumar Singh, Yucheng Fu, Zhuo Li, Yulong Wang, Jie Bao, Zhijie Xu, Guosheng Li, Cassidy Anderson, Lili Shi, Yuehe Lin, Peter G. Khalifah, Wei Wang, Jun Liu, Jie Xiao, Dongping Lu
Summary: In this study, a simple strategy was demonstrated for constructing low-tortuosity through-pores in both vertical and planar directions of electrodes by casting large particles into single-particle-layer electrodes. Through multi-scale characterizations and simulations, correlations between material/electrode structures, electrolyte permeability, polysulfide migration, and sulfur reactions were elucidated. The high-loading and dense sulfur cathode fabricated by this method delivers a high specific capacity at a very low electrolyte/sulfur ratio.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Benjamin T. Diroll, Alexandra Brumberg, Ariel A. Leonard, Shobhana Panuganti, Nicolas E. Watkins, Shelby A. Cuthriell, Samantha M. Harvey, Eli D. Kinigstein, Jin Yu, Xiaoyi Zhang, Mercouri G. Kanatzidis, Michael R. Wasielewski, Lin X. Chen, Richard D. Schaller
Summary: In this study, the photothermal response of titanium nitride nanoparticles was investigated using transient X-ray diffraction, revealing dynamic changes in lattice temperature under different excitation intensities. It was found that increasing excitation intensity leads to slower increases in lattice temperature, indicating higher heat capacity at higher powers. Additionally, higher excitation intensity was also found to result in unexpectedly slower cooling of the nanoparticles, attributed to heating of the solvent near the nanoparticle surface.
Article
Optics
Amitesh Chakraborty, Jeetendra Kumar Singh, D. Sen, Sisa Pityana, I Manna, Shree Krishna, J. Dutta Majumdar
Summary: This study successfully developed a composite surface on stainless steel through laser surface alloying, which improved the hardness and wear resistance of the material, reduced fretting wear kinetics and coefficient of friction. The formation of different carbides in the treated zone and the established mechanism of wear provide valuable insights for further research in material science.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Ehsan Shafiei, Mahdi Saed Kiasat, Ever J. Barbero
Summary: A micro-meso-scale (MMS) model is proposed to predict the rate-dependent behavior of woven fabric (WF) composite considering material nonlinearity and 3D geometrical nonuniformity. Experimental rate-dependent tests on the epoxy matrix and unidirectional composite are conducted to measure model constants, and the mechanical properties and nonlinearity of stress-strain curves of the WF composite are successfully predicted and compared to additional experimental tests.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Electrochemistry
Mitsuharu Tabuchi, Mitsunori Kitta, Koji Yazawa, Kei Kubota
Summary: The study demonstrated that Li1+x(Ni0.3Mn0.7)(1-x)O-2 samples calcined in an N-2 atmosphere had a more homogeneous transition metal distribution and reduced electrochemically inactive domains after electrochemical activation. Additionally, samples calcined in an N-2 atmosphere did not form spinel during charging and did not undergo oxide ion insertion reactions during discharging.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
David W. Gardner, Jiaqi Li, Martin Kunz, Wei-Chih Liao, Chenhui Zhu, Carlo Carraro, Paulo J. M. Monteiro, Roya Maboudian
Summary: This article investigates the intergrain and intragrain interactions of calciumsilicate-hydrates (C-S-H), nanocrystalline forms of tobermorites, which control the long-term stress response of concrete. Through experiments, it is found that layer stacking disorder significantly increases in 11 angstrom tobermorite powder. Similar results are observed in nanocrystalline C-S-H powders, where layer stacking disorder (in the form of intragrain deformation) increases with low water content and large basal spacing.
Article
Materials Science, Ceramics
Zheng Sun, Wenxu Liu, Qiuyang Li, Zhi Tao, Yemei Han
Summary: Introducing Bi(Zn2/3Nb1/3)O-3 successfully improved the dielectric performance of (1-x) BZT20-xBZN composite ceramics, with sample 0.94BZT20-0.06BZN exhibiting enhanced dielectric constants and a higher degree of relaxor behavior (γ=1.91).
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Yaqiong Guo, Wenbin Guo, Libin Lei, Jungu Xu
Summary: This study reports a new oxide ion conductor, Sr2Nb2O7, in which oxide ion conduction is originated from the slight reduction of Nb5+ ions during the high-temperature synthesis process. The bond-valence-based method was used to investigate the oxide ion migration mechanism and revealed a two-dimensional pathway within the perovskite slabs.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Shanmukha Kiran Aramanda, Kamanio Chattopadhyay, Abhik Choudhury
Summary: The paper investigates the evolution of complex patterns in the ternary Ag-Cu-Sb eutectic system, revealing the formation mechanisms of various microstructures, including three-phase eutectic and two-phase growth instabilities. Different microstructures emerge as a result of distinct crystal orientations and growth mechanisms in the presence of temperature gradients.
Article
Mechanics
Siwook Park, Woojin Cho, Byeong-Seok Jeong, Jinwook Jung, Simoon Sung, Hyuntaek Na, Sung-Il Kim, Myoung-Gyu Lee, Heung Nam Han
Summary: The effect of the hole-edge condition on the hole-expansion ratio of ferrite-bainite dual-phase steel was analyzed using a dual-scale finite element approach. It was found that the damage caused by punching is critical to the hole expansion formability of the dual-phase FB steel.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Industrial
Seong-Yong Yoon, Frederic Barlat, Shin-Yeong Lee, Jin-Hwan Kim, Min-Su Wi, Dong-Jin Kim
Summary: In this study, the hydrostatic pressure-dependency of the distortional plasticity model HAH(20) was implemented using a finite element code to account for the strength-differential effect observed in high-strength steel sheets. The implementation was validated by comparing the results with a stand-alone code and experimental data, and the influence of the strength-differential effect on springback simulation was analyzed.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jinheung Park, Matruprasad Rout, Kyung-Mun Min, Shuai-Feng Chen, Myoung-Gyu Lee
Summary: A microstructure-based multiscale framework was developed to study the relationship between microstructure evolution and mechanical behavior of AISI 304LN stainless steel. The model effectively combines crystal plasticity finite element method and probabilistic cellular automata approach to accurately simulate heterogeneous deformation and dynamic recrystallization. The model was validated by comparing it with experimental data, demonstrating its ability to predict flow stresses, grain sizes, DRX volume fraction, and deformed texture. The developed model also allows for examination of recrystallized grains and pole figures during the DRX process, as well as characterization of mechanical responses at the grain level.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Manufacturing
Shuowen Zhang, Shengdun Zhao, Fei Jiang, Yujian Ren, Dawei Zhang, Myoung-Gyu Lee
Summary: This study proposes a new analytical model for the thread rolling process simplified as a single tooth rolling. The protrusion height of the workpiece is calculated using the slip line field theory, and the force and torque of the thread rolling are analytically calculated. Experimental validation demonstrates that the model can accurately predict the force and torque of the thread rolling process, and analyze the effects of lubrication and plastic deformation on the performance of formed parts.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Manufacturing
Sahil Bharti, Aishwary Gupta, Hariharan Krishnaswamy, S. K. Panigrahi, Myoung-Gyu Lee
Summary: In this study, the failure mechanism and fracture forming limits in incremental sheet forming (ISF) were investigated. Three different shapes of parts were developed to cover a range of possible strain paths. Damage models were calibrated and implemented to simulate the failure using experimental tests and numerical simulations. The Hosford Coulomb (HC) damage model showed better overall predictive capability, but all models underestimated the experimental fracture strain measured in ISF.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jinhwa Park, Youngung Jeong
Summary: The Delta EVPSC numerical code was used to simulate the AA6061-T6 aluminum alloy, validating its predictive capability in stress triaxiality and fracture evolution. By calibrating the model parameters and obtaining the initial crystallographic orientation distribution through X-ray diffraction and electron backscattered diffraction, the study found that the EBSD scan of the entire cross-section represents the texture more accurately. Comparison with experimental results confirmed the good agreement between the simulation and other experimental results.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Chemistry, Physical
Junho Bang, Minki Kim, Gihyun Bae, Hong-Gee Kim, Myoung-Gyu Lee, Junghan Song
Summary: This study aimed to develop an efficient wear simulation method to predict quantitative wear reasonably in reduced computational time without updating the geometry for succeeding iterations. By utilizing the scale factor representing the changes in wear properties with respect to wear depth as input, the simulation can capture the wear behavior and quickly predict the increase of wear depth without performing geometry updates.
Article
Engineering, Mechanical
Mooyeong Joo, Min-Su Wi, Seong-Yong Yoon, Shin-Yeong Lee, Frederic Barlat, Carlos N. Tome, Bohye Jeon, Youngung Jeong
Summary: An incremental elasto-visco-plastic self-consistent polycrystal model was directly interfaced with a finite element code to simulate the 3-point-bending process of a mild steel sample. This study predicts the springback response after various amounts of prestrains for the first time. The crystallographic orientation distribution obtained from an EBSD scan was used to assign the initial polycrystalline aggregate for each finite element integration point. The model successfully predicts the effect of prestrain on springback and can be directly applied to industrial forming and springback predictions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Lalit Kaushik, Ki-Seong Park, Jeong-Gyun Kim, Jae-Seong Lee, Youngung Jeong, Shi-Hoon Choi
Summary: A novel method is developed in this study to reconstruct crystallographic orientation data from published articles, and the effectiveness of this method is demonstrated through comparison with real data.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Review
Chemistry, Physical
Yong Hou, Dongjoon Myung, Jong Kyu Park, Junying Min, Hyung-Rim Lee, Ali Abd El-Aty, Myoung-Gyu Lee
Summary: Lightweight sheet metals are attractive for aerospace and automotive applications due to their exceptional properties. Sheet metal forming (SMF) plays a key role in manufacturing lightweight thin-walled complex-shaped components. This article provides a comprehensive review of historical development in SMF and discusses advanced characterization and modelling approaches for lightweight metallic materials.
Article
Metallurgy & Metallurgical Engineering
Bohye Jeon, Min-Seong Kim, Shi-Hoon Choi, Youngung Jeong
Summary: The mechanical behavior of a magnesium alloy E-form under bending was investigated using a polycrystal model and its finite element implementation. The model successfully captured the inhomogeneous stress response and was validated by comparing with experimental results. Additionally, the study found that the bendability of the magnesium alloy could be improved by weakening the initial texture.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Engineering, Mechanical
Seongyong Yoon, Frederic Barlat
Summary: A non-iterative stress update method is proposed to accelerate finite element simulations in plasticity. This method directly integrates the stress tensor based on elastoplastic constitutive law without needing a recursive root-finding process. The method ensures the positivity of the effective plastic strain increment and resolves the uncertainty of yield condition fulfillment through a stress projection technique. It significantly reduces computation time by approximately 50% while maintaining high accuracy in a variety of finite element simulation examples.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Shin-Yeong Lee, Seong-Yong Yoon, Jin-Hwan Kim, Kyung-Seok Oh
Summary: This study assesses the performance of conventional and advanced constitutive models in predicting springback for ultra-high strength steel. The elasto-plastic behavior of a martensitic steel sheet sample is characterized to evaluate the conventional stress-strain behavior. Various tests, including uniaxial compression and tension-compression experiments, are conducted to assess the strength-differential effect and hardening fluctuations during non-linear loading paths. Three constitutive plasticity models are calibrated and employed for finite element predictions of springback. The HAH20 model, which considers both SD and NLLP effects, performs the best in predicting forming and springback for martensitic steel.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Bohye Jeon, Min -Su Lee, Tea -Sung Jun, Youngung Jeong
Summary: This study investigated a commercially pure titanium sample using an elasto-visco-plastic self-consistent polycrystal model. The temperature-dependent plastic deformation behavior was described using a dislocation density-based hardening model. The model successfully reproduced various experimental behaviors and provided an in-depth interpretation of the mechanical behavior of alpha-titanium under different temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)