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学者姓名:秦红玲
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This study explores material modification utilizing molybdenum disulfide and glass fiber as lubricating and reinforcing modified materials respectively. The specimens underwent tests for mechanical-physical properties, oil storage capacity and frictional characteristics. The differential analysis identified the optimal mechanical-physical properties of the porous composite PI material at a molding pressure of 192 MPa, molding temperature of 330°C, 9% of AC foaming agent content, 8% of molybdenum disulfide content, and 20% of glass fiber content. The wear coefficient increased with load and decreased with rotational speed, indicating the suitability of this porous composite oil-retaining PI material for medium-high-speed and low-load frictional conditions.
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GB/T 7714 | Jiangxiong Chen , Hongling Qin , Xiang Xu et al. Study on the performance of porous polyimide bearing cage material modified with molybdenum disulfide and glass fiber [J]. | Journal of Physics:Conference Series , 2024 , 2760 (1) . |
MLA | Jiangxiong Chen et al. "Study on the performance of porous polyimide bearing cage material modified with molybdenum disulfide and glass fiber" . | Journal of Physics:Conference Series 2760 . 1 (2024) . |
APA | Jiangxiong Chen , Hongling Qin , Xiang Xu , Yi Zeng , Kangni Chen . Study on the performance of porous polyimide bearing cage material modified with molybdenum disulfide and glass fiber . | Journal of Physics:Conference Series , 2024 , 2760 (1) . |
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Metal rubber is an elastic porous pure metal material with a complex and disordered internal mesh interpenetration structure, which is difficult to describe accurately by general methods, which limits its controllable applications in high temperature environments. To this end, a finite element model of metal rubber is constructed by virtual preparation technology that integrates the material properties, wire dimensions and process parameters of metal rubber. On this basis, the dynamic theoretical formulas for the heat conduction of metal wire microelements inside metal rubber is derived and related finite element analysis is carried out. The results show that when only thermal load is present, the metal rubber is mainly realized by continuous metal wires for heat transfer and heat exchange through interfacial contact, and the temperature field is distributed in a gradient along the forming direction. In addition, due to the expansion of the material, its macroscopic size increases, but its thermal expansion coefficient is smaller than that of the solid material under the action of the external constraint and pore containment mechanism. When thermal-force loading is also present, the metal rubber shows good structural stability and heat resistance. The thermomechanical properties of the material were tested by high-temperature quasi-static compression test, it is verified that the established finite element model can effectively reflect and predict the complex thermomechanical properties of the metal-rubber material, which provides some theoretical guidance for the application of the material in high-temperature environment. © 2024 Chinese Mechanical Engineering Society. All rights reserved.
Keyword :
lattice interpenetrating structure lattice interpenetrating structure metal rubber metal rubber thermomechanical properties thermomechanical properties virtual preparation virtual preparation
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GB/T 7714 | Ren, Z. , Huang, Z. , Fang, R. et al. Study on Thermomechanical Properties of Metal-rubber Disordered Lattice Interpenetrating Structures; [金属橡胶无序式网格互穿结构的热力学性能研究] [J]. | Journal of Mechanical Engineering , 2024 , 60 (8) : 165-175 . |
MLA | Ren, Z. et al. "Study on Thermomechanical Properties of Metal-rubber Disordered Lattice Interpenetrating Structures; [金属橡胶无序式网格互穿结构的热力学性能研究]" . | Journal of Mechanical Engineering 60 . 8 (2024) : 165-175 . |
APA | Ren, Z. , Huang, Z. , Fang, R. , Wang, Q. , Mo, J. , Qin, H. . Study on Thermomechanical Properties of Metal-rubber Disordered Lattice Interpenetrating Structures; [金属橡胶无序式网格互穿结构的热力学性能研究] . | Journal of Mechanical Engineering , 2024 , 60 (8) , 165-175 . |
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With the introduction of concepts, such as clean power plants and smart power plants, higher demands are placed on the operating environment of power plants, the reliability and longevity of hydro generator set operation. The carbon brush/slip ring assembly is an important part of the excitation system of a hydro generator set, and the excitation current is transmitted through sliding contact between the two. In actual operation, the carbon brush/slip ring assembly often has problems, such as carbon brush overheating, ignition and arc erosion due to the change of interface contact state. In this way, it not only causes temporary elimination of the hydro generator set, but also seriously affects the safety and reliability of hydro generator set operation. Since most online monitoring systems can only monitor the temperature and overcurrent of carbon brushes and wear parameters, they cannot directly monitor the contact state between carbon brush/slip ring assembly, so indirect monitoring becomes the key to solve the problem. The contact state between carbon brush/sip ring assembly can be characterized by friction coefficient, contact resistance, contact voltage drop, etc. For current-carrying friction systems, the most commonly used parameter is the contact resistance between the interfaces. The contact resistance can not only reflect the rough contact state between the interfaces and the generation of surface film, but also to some extent the distance between the friction interfaces. Generally speaking, the rougher the surface, the greater the distance between the two friction surfaces, the smaller the effective conductive area between the friction sub, the greater the contact resistance. When the contact resistance between the friction subsets increases, the temperature of the carbon brush/slip ring assembly will further increase. If the relationship between temperature and contact resistance can be established, the contact state can be indirectly reflected by temperature. Therefore, this paper established a mathematical model of contact resistance based on the theories related to electrical contact and heat transfer. The model aimed to estimate the contact resistance value based on the carbon brush temperature. The relevant parameters in the model were determined by the carbon brush/slip ring current-carrying friction test, and the dynamic changes of contact resistance and the key influencing factors were calculated and analyzed under different rated current, rotational speed and spring pressure conditions. The results of the calculation were substituted into COMSOL Multiphysics finite element analysis software, and the temperature rise of the carbon brush was simulated and compared with the temperature rise of the carbon brush obtained from the test based on its built-in physical field control equations to verify the validity of the model. The calculation results showed that the contact resistance peaked at the beginning of the system operation, and then levelled off gradually. When the interface contact pressure was certain, the contact resistance value decreased with the increase of rated current; under the condition of certain rated current, the contact resistance value of carbon brush with high interface contact pressure was small. When the rotational speed of collector ring increased, the influence of spring pressure on the contact resistance between friction pairs further increased. When the rated current reached above 1 000 A, the contact resistance between the friction interface further increased with the increase of slip ring rotational speed. © 2024 Science Press. All rights reserved.
Keyword :
Carbon Carbon Contact resistance Contact resistance Finite element method Finite element method Friction Friction Heat transfer Heat transfer Hydroelectric generators Hydroelectric generators Hydroelectric power plants Hydroelectric power plants Interface states Interface states Online systems Online systems Wear of materials Wear of materials
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GB/T 7714 | Qin, Hongling , Li, Hongbo , Zhao, Xinze et al. Calculation and Simulation Verification of Contact Resistance of Carbon Brush/Slip Ring Friction Pair of Hydro Generator Set [J]. | Tribology , 2024 , 44 (1) : 60-69 . |
MLA | Qin, Hongling et al. "Calculation and Simulation Verification of Contact Resistance of Carbon Brush/Slip Ring Friction Pair of Hydro Generator Set" . | Tribology 44 . 1 (2024) : 60-69 . |
APA | Qin, Hongling , Li, Hongbo , Zhao, Xinze , Yi, Jingwen , Zhao, Yijun . Calculation and Simulation Verification of Contact Resistance of Carbon Brush/Slip Ring Friction Pair of Hydro Generator Set . | Tribology , 2024 , 44 (1) , 60-69 . |
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水轮发电机组中的碳刷在运行的过程中产生的碳粉在接触面会导致振动、高温、打火等问题,从而引发与之配对的集电环表面出现损伤,这种损伤的累计会进一步恶化电机的运行环境。针对此问题,从影响碳刷服役性能的主要因素、检测方法及碳刷选型标准等三方面进行分析研究,介绍了制造工艺、材料配方、运行工况等三种因素影响下碳刷物理性能和载流摩擦磨损性能的变化,重点分析了其对碳刷的载流摩擦磨损性能影响,以及碳刷性能的检测方法和碳刷的选型标准。为水轮发电机组碳刷的选型与检测、性能升级等提供思路。
Keyword :
影响因素 影响因素 检测 检测 水轮发电机组 水轮发电机组 碳刷 碳刷 质量 质量 选型 选型
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GB/T 7714 | 秦红玲 , 卢杰 , 唐伟 et al. 影响水轮发电机组碳刷性能的主要因素及检测方法与标准 [J]. | 水力发电 , 2024 , 50 (04) : 60-65 . |
MLA | 秦红玲 et al. "影响水轮发电机组碳刷性能的主要因素及检测方法与标准" . | 水力发电 50 . 04 (2024) : 60-65 . |
APA | 秦红玲 , 卢杰 , 唐伟 , 徐翔 , 赵新泽 , 杨大贵 . 影响水轮发电机组碳刷性能的主要因素及检测方法与标准 . | 水力发电 , 2024 , 50 (04) , 60-65 . |
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金属橡胶是一种弹性多孔纯金属材料,其内部的网格互穿结构复杂而无序,难以通过一般方法准确描述,这限制了其在高温环境下的可控应用。为此,通过虚拟制备技术构建了综合考虑金属橡胶材料属性、线匝几何尺寸及工艺参数等因素的金属橡胶有限元模型。在此基础上,推导出金属橡胶内部金属丝微元热传导的动态理论公式并进行相关的有限元分析。结果表明:当仅有热载荷时,金属橡胶主要由连续金属丝实现传热并通过界面接触进行换热,温度场沿成形方向呈梯度分布。此外,由于材料的膨胀其宏观尺寸会增大,但在外部约束与孔隙收容机制的作用下其热膨胀系数小于实心材料的热膨胀系数。而当同时存在热-力载荷时,金属橡胶展现出了良好的结构稳定性与耐热性。通过材料高温准静态压缩试验对材料的热力学性能进行了测试,验证所建立的有限元模型能够有效地反映与预测金属橡胶材料复杂的热力学性能,为材料在高温环境下的应用提供了一定的理论指导。
Keyword :
热力学性能 热力学性能 网格互穿结构 网格互穿结构 虚拟制备 虚拟制备 金属橡胶 金属橡胶
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GB/T 7714 | 任志英 , 黄子豪 , 方荣政 et al. 金属橡胶无序式网格互穿结构的热力学性能研究 [J]. | 机械工程学报 , 2024 , 60 (08) : 165-175 . |
MLA | 任志英 et al. "金属橡胶无序式网格互穿结构的热力学性能研究" . | 机械工程学报 60 . 08 (2024) : 165-175 . |
APA | 任志英 , 黄子豪 , 方荣政 , 王秦伟 , 莫继良 , 秦红玲 . 金属橡胶无序式网格互穿结构的热力学性能研究 . | 机械工程学报 , 2024 , 60 (08) , 165-175 . |
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碳刷/集电环组件作为水轮发电机组励磁系统的重要组成部分,常因界面接触状态变化而出现碳刷过热、打火、电弧侵蚀等问题.其界面间的接触状态目前无法直接监测,间接监测则成为解决该问题的关键.载流摩擦副间的接触状态常用接触电阻进行表征,因此,本文中基于电接触和传热学的相关理论,建立了接触电阻的数学模型,该模型旨在根据碳刷温度估算接触电阻值.通过碳刷/集电环载流摩擦试验确定模型中的相关参数,计算并分析不同额定电流、转速、弹簧压力条件下,接触电阻的动态变化及关键影响因素.将计算结果代入COMSOL Multiphysics有限元分析软件中,基于其内置的物理场控制方程,仿真模拟碳刷的温度并与试验得到的碳刷的温度作比较,以验证该模型的有效性.计算结果表明:当界面接触压力一定时,接触电阻值随着额定电流的增大而减小;当额定电流一定时,界面接触压力大的碳刷接触电阻值小;当集电环转速增大时,弹簧压力对接触电阻的影响进一步增大.
Keyword :
在线监测 在线监测 接触电阻 接触电阻 数学模型 数学模型 有限元 有限元 碳刷/集电环 碳刷/集电环
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GB/T 7714 | 秦红玲 , 李洪波 , 赵新泽 et al. 水轮发电机组碳刷/集电环摩擦副接触电阻计算及仿真验证 [J]. | 摩擦学学报(中英文) , 2024 , 44 (01) : 60-69 . |
MLA | 秦红玲 et al. "水轮发电机组碳刷/集电环摩擦副接触电阻计算及仿真验证" . | 摩擦学学报(中英文) 44 . 01 (2024) : 60-69 . |
APA | 秦红玲 , 李洪波 , 赵新泽 , 易静雯 , 赵益俊 . 水轮发电机组碳刷/集电环摩擦副接触电阻计算及仿真验证 . | 摩擦学学报(中英文) , 2024 , 44 (01) , 60-69 . |
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This study explores material modification utilizing molybdenum disulfide and glass fiber as lubricating and reinforcing modified materials respectively. The specimens underwent tests for mechanical-physical properties, oil storage capacity and frictional characteristics. The differential analysis identified the optimal mechanical-physical properties of the porous composite PI material at a molding pressure of 192 MPa, molding temperature of 330°C, 9% of AC foaming agent content, 8% of molybdenum disulfide content, and 20% of glass fiber content. The wear coefficient increased with load and decreased with rotational speed, indicating the suitability of this porous composite oil-retaining PI material for medium-high-speed and low-load frictional conditions. © Published under licence by IOP Publishing Ltd.
Keyword :
Composite materials Composite materials Friction Friction Glass fibers Glass fibers Layered semiconductors Layered semiconductors Molding Molding Molybdenum disulfide Molybdenum disulfide Physical properties Physical properties
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GB/T 7714 | Chen, Jiangxiong , Qin, Hongling , Xu, Xiang et al. Study on the performance of porous polyimide bearing cage material modified with molybdenum disulfide and glass fiber [C] . 2024 . |
MLA | Chen, Jiangxiong et al. "Study on the performance of porous polyimide bearing cage material modified with molybdenum disulfide and glass fiber" . (2024) . |
APA | Chen, Jiangxiong , Qin, Hongling , Xu, Xiang , Zeng, Yi , Chen, Kangni . Study on the performance of porous polyimide bearing cage material modified with molybdenum disulfide and glass fiber . (2024) . |
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碳刷/集电环组件作为水轮发电机组励磁系统的重要组成部分,常因界面接触状态变化而出现碳刷过热、打火、电弧侵蚀等问题.其界面间的接触状态目前无法直接监测,间接监测则成为解决该问题的关键.载流摩擦副间的接触状态常用接触电阻进行表征,因此,本文中基于电接触和传热学的相关理论,建立了接触电阻的数学模型,该模型旨在根据碳刷温度估算接触电阻值.通过碳刷/集电环载流摩擦试验确定模型中的相关参数,计算并分析不同额定电流、转速、弹簧压力条件下,接触电阻的动态变化及关键影响因素.将计算结果代入COMSOL Multiphysics有限元分析软件中,基于其内置的物理场控制方程,仿真模拟碳刷的温度并与试验得到的碳刷的温度作比较,以验证该模型的有效性.计算结果表明:当界面接触压力一定时,接触电阻值随着额定电流的增大而减小;当额定电流一定时,界面接触压力大的碳刷接触电阻值小;当集电环转速增大时,弹簧压力对接触电阻的影响进一步增大.
Keyword :
在线监测 在线监测 接触电阻 接触电阻 数学模型 数学模型 有限元 有限元 碳刷/集电环 碳刷/集电环
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GB/T 7714 | 秦红玲 , 李洪波 , 赵新泽 et al. 水轮发电机组碳刷/集电环摩擦副接触电阻计算及仿真验证 [J]. | 摩擦学学报 , 2024 , 44 (1) : 60-69 . |
MLA | 秦红玲 et al. "水轮发电机组碳刷/集电环摩擦副接触电阻计算及仿真验证" . | 摩擦学学报 44 . 1 (2024) : 60-69 . |
APA | 秦红玲 , 李洪波 , 赵新泽 , 易静雯 , 赵益俊 . 水轮发电机组碳刷/集电环摩擦副接触电阻计算及仿真验证 . | 摩擦学学报 , 2024 , 44 (1) , 60-69 . |
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Al3Ni nanowires were fabricated via the selective etching of directionally solidified Al-Ni eutectic alloys. The effects of different growth rates from 2 to 1000 mu m/s on the microstructure and morphology of eutectic alloys under a temperature gradient of 10 K/cm were investigated. The mechanism of the cross-sectional morphology transformation of Al3Ni nanofibers was investigated using the dynamic undercooling degree Delta Tk\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\Delta {T}_{\text{k}}$$\end{document}. Then, the morphologies of the Al3Ni nanowires at different growth rates and corrosion time were studied using the constant potential corrosion method. Increasing the growth rate increased the roundness of the section and decreased the fiber phase spacing and diameter. At a growth rate of 2 mu m/s, both Al and Al3Ni exhibited kinetic undercooling (Delta Tk,Al3Ni\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},{\text{Al}}_{3}\text{Ni}}$$\end{document} and Delta Tk,Al\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},\text{Al}}$$\end{document}), with values below the critical kinetic undercooling (Delta Tk,Al3Nic\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},{\text{Al}}_{3}\text{Ni}}<^>{\text{c}}$$\end{document} and Delta Tk,Alc\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},\text{Al}}<^>{\text{c}}$$\end{document}). The Al3Ni fibers underwent faceted growth and developed a thin ribbon structure. At 5 mu m/s, the kinetic undercooling of Al3Ni and Al exceeded Delta Tk,Al3Nic\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},{\text{Al}}_{3}\text{Ni}}<^>{\text{c}}$$\end{document} and Delta Tk,Alc\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta T}_{\text{k},\text{Al}}<^>{\text{c}}$$\end{document}, respectively, leading to nonfaceted growth and elliptically shaped Al3Ni fibers. With prolonged corrosion time, the length of the Al3Ni nanowires increased.
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GB/T 7714 | Gao, Jianjun , Zhang, Xiaheng , Liu, Yamin et al. Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution [J]. | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE , 2024 . |
MLA | Gao, Jianjun et al. "Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution" . | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE (2024) . |
APA | Gao, Jianjun , Zhang, Xiaheng , Liu, Yamin , Huang, Chaoyang , Qin, Hongling , Yao, Ligang . Morphologies and Structures of Al3Ni Nanowires Controlled by Directional Solidification and Selective Dissolution . | METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE , 2024 . |
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In this study, a porous structure for a porous liquid storage medium is generated, and the homogenization theory based on displacement boundary conditions is used to predict the effective mechanical properties. The relationship between the porous material's macroscopic mechanical properties and microstructure is next analyzed. In order to establish the relationship between the microstructure of porous materials and their macroscopic mechanical properties, assuming that the pores grow along the z direction, a method is proposed to generate 3D open-cell porous materials based on six design parameters (i.e., the number of pores, porosity, irregularity of pore distribution, the randomness of pore growth in the x and y directions, and randomness of pore size). Since the porosity of oil-bearing materials ranges from 20 to 30%, the porosity of the RVE (Representative Volume Element) was kept under control at about 25%, and the effect of the six design factors on the mechanical properties of the RVE was investigated. Utilizing SLA 3D printing technology, specimens were produced, and compression tests were used to show how useful the results of the numerical analysis were. The results demonstrated that after the number of RVE pores reaches 9, the numerical results have good repeatability. The irregularity of the initial pore distribution has little effect on the effective mechanical properties of the RVE. At the same time, the increase in the randomness of pore growth and the randomness of pore size increases the degree of weakening of the mechanical properties in the z-direction, while reducing the degree of weakening in the x and y directions, but the latter has a smaller impact. Furthermore, there is a superimposition effect of design parameters on the RVE.
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GB/T 7714 | Chen, Kangni , Qin, Hongling , Ren, Zhiying . Establishment of the microstructure of porous materials and its relationship with effective mechanical properties [J]. | SCIENTIFIC REPORTS , 2023 , 13 (1) . |
MLA | Chen, Kangni et al. "Establishment of the microstructure of porous materials and its relationship with effective mechanical properties" . | SCIENTIFIC REPORTS 13 . 1 (2023) . |
APA | Chen, Kangni , Qin, Hongling , Ren, Zhiying . Establishment of the microstructure of porous materials and its relationship with effective mechanical properties . | SCIENTIFIC REPORTS , 2023 , 13 (1) . |
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