Article
Engineering, Civil
Arabinda Meher, Manas Mohan Mahapatra
Summary: Understanding the microstructural and mechanical behavior of friction stir welded magnesium matrix composites is important for their applications in automobile and aerospace components. In this study, friction stir welding of magnesium RZ5/8 wt% TiB2 metal matrix composites was carried out under different joining conditions. It was found that better grain refinement and uniform distribution can be achieved at specific tool rotational speed and traverse speed. The highest temperature, hardness, and tensile strength were observed in the nugget zone. Additionally, high residual stresses were observed near the weld zone.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Simone Barcellona, Luigi Piegari
Summary: A proposed integrated electro-thermal model can predict the thermal behavior of a battery cell based on its current and ambient conditions. The model was tuned and validated with experimental results, showing sufficient precision to predict battery temperature with acceptable accuracy considering its low complexity.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2021)
Article
Chemistry, Physical
Dawei Yuan, Xiangpeng Xiao, Jinshui Chen, Baojun Han, Hao Huang, Bin Yang
Summary: The addition of silver improved the mechanical properties and electrical conductivity of Cu-6.5Fe-0.2Cr alloy, leading to higher peak strength and conductivity in CFCA alloy. Silver refinement and promotion of nano-scale Fe phase precipitation were observed, enhancing the overall performance of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Applied
Qingshan Fu, Wei Zhang, Ismail Pir Muhammad, Xuedan Chen, Yue Zeng, Botao Wang, Shangyun Zhang
Summary: In order to improve the mechanical and thermal performance of electrospun separators for batteries, a core@shell composite membrane was developed using a combination of organic & inorganic doping, hot-pressing, and coaxial electrospinning technique. The membrane showed high tensile strength, maintained integrity at high temperatures, and exhibited good affinity to electrolyte for excellent electrochemical performance in lithium ion batteries.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Computer Science, Information Systems
Simone Barcellona, Silvia Colnago, Paolo Montrasio, Luigi Piegari
Summary: Lithium-ion batteries are attractive for electric vehicles but sensitive to temperature. Thermal management systems are needed to mitigate temperature issues. This paper proposes an integrated electro-thermal model to estimate the thermal behavior of each battery cell in a battery pack.
Article
Engineering, Mechanical
Seyyed Amirhossein Alavi, Mahmoud Afshari, Maryam Nikbakht, Mohammad Reza Samadi
Summary: The objective of this study is to improve the mechanical properties of dissimilar joint between 316 stainless steel and GTD-111 superalloy obtained by laser welding. The pulse frequency, welding speed, and laser power were optimized to achieve desired weld penetration, hardness, and tensile strength. The microstructure changes were observed using optical and scanning electron microscopes. The results showed that increasing the laser power enhanced weld penetration but worsened hardness and tensile strength due to solidification cracks and formation of Laves phase. Faster welding speed resulted in decreased penetration depth and increased hardness and tensile strength due to dendritic structure formation and reduced Laves phase. Liquation cracks and voids were observed when pulse frequency and laser power increased simultaneously. The optimal mechanical properties were obtained at certain pulse frequency, welding speed, and laser power.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Mechanics
Joo-Seung Choi, Hyun-Wook Park, Jung -Eon Noh, Jihun Cha, Woo-Hyeok Jang, Chun-Gon Kim
Summary: This study introduces a structure-battery-integrated energy storage system based on carbon and glass fabrics, providing stable and high electrochemical performance under mechanical loading. The system utilizes a thermoplastic tape to separate the battery and structural parts and prevent penetration and leakage. Evaluation shows initial capacity of approximately 125 mAh/gLFP and steady cycling characteristics of 110 mAh/gLFP for 50 cycles. The structure-integrated battery exhibits an energy density of over 25 Wh/kgstr and remains stable even under tensile strain beyond 1%.
COMPOSITE STRUCTURES
(2023)
Article
Metallurgy & Metallurgical Engineering
R. Palanivel
Summary: Nd: YAG laser beam welding was used to join grade 2 titanium tubes. The effect of laser power was studied through metallurgical characterization and mechanical tests. It was found that as power increased, the bead geometry changed from wedge to parallel. The weld zone exhibited a rough, uneven, and serrated coarse granular texture. Laser power had a significant impact on the misorientation angle patterns, with higher power resulting in larger pores. The weld zone showed high density dislocation patterns and more sub grain boundaries. Laser welding strengthened the weld zone, with less strengthening observed at higher laser power in microhardness analysis. Lower laser power achieved higher tensile strength. Ductile failure was observed due to fine voids in the fracture surface analysis.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Chemistry, Physical
Ziwei Hong, Houcai Dong, Shaojie Han, Weihong Li, Qingyu Dong, Yingqian Cao, Xiuling Gao, Yixiao Zhang, Wei Lu, Liwei Chen
Summary: The safety performance of Ni-rich layered oxide materials used in electrical vehicle batteries can be improved by introducing nanometer-sized LMFP particles, which delay the phase transformation of NCM622 during thermal runaway and reduce heat generation between charged cathode and liquid electrolyte.
JOURNAL OF POWER SOURCES
(2021)
Article
Nanoscience & Nanotechnology
Shenghui Wang, Zhichao Ma, Wenyang Zhao, Wei Zhang, Chaofan Li, Siguo Yang, Jiong Liu, Zixin Guo, Hongwei Zhao, Luquan Ren
Summary: The evolution of mechanical properties of separators affected by temperature shifts was experimentally verified in this study. The temperature-dependent weakening of elastic modulus and hardness of separators was observed. The variation trends of elastic modulus, hardness, and hysteresis response of the separators were investigated through nanoindentation tests. X-ray diffraction and energy-dispersive X-ray spectroscopy were used to analyze the temperature-induced residual stress and elemental distribution. The obtained evolution law of temperature shift-induced mechanical properties of separators could facilitate the optimal design of separators and enhance the safety performance of lithium-ion batteries.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Mechanics
Jia-Ming Chang, Kam-Hong Kam, Yu-Jun Liu, Nitika Devi, Tsung-Ying Tsai, Kun-Tso Chen, Pai-Chen Lin
Summary: This study examined the fatigue behavior of laser-welded lap-shear samples in copper sheets of different thicknesses using experimental and numerical methods. Experimental results showed interfacial failure under high-load and low-load conditions, as well as top sheet separation under medium-load conditions. Finite element analyses were conducted to calculate stress intensity factors for interfacial and kinked cracks. Two fatigue models were derived based on these factors and the Paris law to analyze the crack evolution and estimate fatigue lives. The predicted fatigue lives were in line with the experimental trends.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Ting Dong, Zhen Yu, Jungwook Choi, Kisoo Yoo, Jaesool Shim, Tae Jo Ko
Summary: By utilizing the double-matrix encapsulation and penetration (DMEP) technique, a new lithium-ion battery separator was developed with improved properties, such as higher electrolyte uptake, porosity, tensile strength, ionic conductivity, thermal stability, and electrochemical performance.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Green & Sustainable Science & Technology
Jake Entwistle, Ruihuan Ge, Kunal Pardikar, Rachel Smith, Denis Cumming
Summary: This study aims to enhance the energy density and charge/discharge speeds of Li-ion batteries by exploring the relationship between electronic conductivity and ion diffusion. Through literature review, the study investigates the existing techniques and methods, as well as the optimal arrangement of CBD and the formation of electrode structures, providing guidance and suggestions for future research.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Multidisciplinary Sciences
T. M. M. Heenan, I. Mombrini, A. Llewellyn, S. Checchia, C. Tan, M. J. Johnson, A. Jnawali, G. Garbarino, R. Jervis, D. J. L. Brett, M. Di Michiel, P. R. Shearing
Summary: This study characterizes the temperature and mechanical strain of high-rate lithium-ion batteries using advanced synchrotron XRD methods. The results show that the discharge time and optimization strategy significantly affect the internal temperature of the battery under the same current. The temperature rise is caused by heat accumulation, which is influenced by the charging protocol and battery degradation.
Article
Energy & Fuels
Simone Barcellona, Silvia Colnago, Lorenzo Codecasa, Luigi Piegari
Summary: Nowadays, energy storage systems are crucial in sectors such as renewable energy production and sustainable mobility. Electrochemical devices, particularly EDLCs, LiCs, and LiBs, are the most common due to their high efficiency and flexibility. This study presents a unified model for predicting the electrical behavior of LiBs in the time or frequency domain and validates it through experimental tests.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Dongkyoung Lee, Youngjin Seo, Sukhoon Pyo
Article
Chemistry, Physical
Dongkyoung Lee
Article
Chemistry, Multidisciplinary
Dongkyoung Lee, Byungmoon Oh, Jungdon Suk
APPLIED SCIENCES-BASEL
(2019)
Article
Chemistry, Physical
Youngjin Seo, Dongkyoung Lee, Sukhoon Pyo
Article
Chemistry, Physical
Seungik Son, Dongkyoung Lee
Article
Chemistry, Physical
Lanh Ngoc Trinh, Dongkyoung Lee
Article
Chemistry, Physical
Dongkyu Park, Dongkyoung Lee
Summary: This study analyzed the morphological variation of grooves and process efficiency during laser structuring of LiFePO4 cathodes using nanosecond laser, and found that applying low fluence and multi-pass is advantageous for enhancing the laser structuring of electrodes.
Article
Chemistry, Physical
Mang-Muan Lian, Youngjin Seo, Dongkyoung Lee
Summary: This study examines the cutting quality of intrusive igneous rocks using a high-power multimode fiber laser, focusing on kerf width, penetration depth, and silicon content. Results show that the kerf widths decrease gradually and penetration depths sharply decrease as scanning speeds increase. The cutting quality of each rock specimen largely depends on the scanning speed and silica content.
Article
Chemistry, Physical
Youngjin Seo, Jungsoo Nam, Huitaek Yun, Martin Byung Guk Jun, Dongkyoung Lee
Summary: This study investigates the applicability of laser spot cutting to Au-coated SCPs through experiments with different pulse durations and total energies. The impact of Au coating on SCPs was evaluated, revealing hole penetration at low energy levels due to the higher thermal conductivity of gold.
Article
Materials Science, Multidisciplinary
Tam-Van Huynh, Youngjin Seo, Dongkyoung Lee
Summary: This study investigated the scabbing characteristics for cement mortar with different silica sand proportions in laser scabbling process. Five types of cement mortar with varying silica sand proportions were fabricated and scabbled using a high-density power laser beam. The effects of silica sand proportion on color changing, penetration depth, generation of micro-cracks and pores, as well as chemical composition changes were studied in this research. The results are expected to contribute valuable knowledge to understanding the laser scabbling process for cement-based materials.
Article
Engineering, Mechanical
Suman Chatterjee, Lanh N. Trinh, Dongkyoung Lee
Summary: Laser beam welding (LBW) has wide applications, and joining of different materials is challenging. However, the quality of the welded joints can be improved by varying the laser powers.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Youngjin Seo, Lanh Ngoc Trinh, Dongkyoung Lee
Summary: Previous research has clarified the impact of silica sand as an aggregate on the properties of concrete material. This study investigates the cutting characteristics of cement mortar with different content of silica sand using a laser beam. The results show that the effect of laser scanning speed and silica sand contents on melting and kerf widths was indistinctly observed, but the difference in the penetration depth was certainly revealed.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
