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Selective laser melting of bulk immiscible alloy with enhanced strength:Heterogeneous microstructure and deformation mechanisms

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Journal of Materials Science & Technology 2022年第9期104卷 81-87页

作者： Shengfeng Zhou Min Xie Changyi Wu Yanliang Yi Dongchu Chen Lai-Chang Zhang MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou 510632China School of Materials Science and Engineering Tianjin Polytechnic UniversityTianjin 300387China Department of Educational Science Hunan First Normal UniversityChangsha 410205China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528225China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia

To overcome the dimension limits of immiscible alloys produced by traditional techniques and enhance their mechanical properties,bulk Cu-Fe-based immiscible alloy with abundant nanotwins and stacking faults was successfully produced by selective laser melting(SLM).The SLM-produced bulk immiscible alloy displays a heterogeneous microstructure characterized by micro-scaledγ-Fe particles dispersed in fineε-Cu matrix with a high fraction(~92%)of high-angle grain ***,abundant nanotwins and stacking faults are generated in the interior of nano-scaledγ-Fe particles embedded withinε-Cu *** heterogeneous interface of soft domains(ε-Cu)and hard domains(γ-Fe)not only induces the geometrically necessary dislocations(GNDs)but also affects the dislocation propagation during plastic ***,the bimodal heterogeneous interface,and the resistance of nanotwins and stacking faults to the propagation of partial dislocation make the bulk immiscible alloy exhibit an enhanced strength of~590 MPa and a good ductility of~8.9%.

关键词： Immiscible alloy Selective laser melting Heterogeneous microstructure Nanotwins Stacking faults

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Numerical Simulation of Harmonic Response Analysis for Small Out-Line Package

Numerical Simulation of Harmonic Response Analysis for Small...

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2024 Asia-Pacific Conference on Software engineering, Social Network Analysis and Intelligent Computing, SSAIC 2024

作者： Lin, Hai Dong, Xianshan Su, Wei Huang, Qinwen Tomar, Agam Jinan University School Of Mechanics And Construction Engineering Guangzhou510632 China China Electronic Product Reliability And Environmental Testing Research Institute Sci. And Technol. On Reliability Phys. And Application Technology Of Electronic Component Laboratory Guangzhou510610 China Moe Key Lab Of Disaster Forecast And Control In Engineering Guangzhou510632 China Faculty Of Engineering And Mathematical Sciences University Of Western Australia Australia

ISBN: (纸本)9798350393682

In order to discuss the influence of the number of sheets on acceleration and frequency curve of sample surface, the finite element model of clamp, SOP sample and metal sheet is firstly established with Solidworks. Different number of sheets are laid on the surface of SOP sample. Then changing the number of the paper sheets, harmonic response analysis is converted based on modal analysis. The influence of different number of sheet on acceleration and frequency curve is discussed. The results show the relation between acceleration-frequency curve of different thickness of paper, which provides reference for packaging design. © 2024 IEEE.

关键词： Sheet metal

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Mechanical Analysis of Interface in Coating Structure under Conical Concave Indenter with FEM

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Journal of Applied Mathematics and Physics 2022年第5期10卷 1509-1524页

作者： Shi-Qing Huang Pan-Jun Tang Wen-Hua Zhang MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China School of Mechanics and Construction Engineering Jinan University Guangzhou China

The evaluation of mechanical properties of coating structures has always been a very important topic in the fields of mechanics, materials, and machinery. The traditional evaluation methods are easy to produce deviation, because the ratio of coating thickness to substrate thickness is too small. Therefore, accurate analysis and calculation is particularly important. Indentation technology is an important means of coating structure analysis and measurement, the basis of standardized application and analysis of coating structure, and a classical method for accurate analysis and calculation of coating structure. The finite element method is a very good means to analyze and study this kind of problems because of its applicability. Based on the finite element method, this paper analyzes and studies the interface connection form, substrate, and local delamination effects of the indentation behavior of the coating structure under the conical concave indenter. In this paper, the finite element method, which is more convenient for analysis and calculation, is used to analyze the influence of interface connection form, substrate, and local delamination on the coating structure. The results of force displacement, interface normal stress, and interface shear stress are analyzed in detail, and the effects of the three effects on the coating structure are proved. The significance of this study is reflected in: based on the analysis of the three effects of interface connection form, substrate, and local delamination, the mechanical properties of the coating structure are more in-depth, which provides some reference for mechanical engineers to design and test the coating structure.

关键词： Coating Structure Finite Element Method Contact Mechanics Interfacial

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The Effects of RF Power and Cavity Structure on the Plasma Discharge Characteristics of RPS

The Effects of RF Power and Cavity Structure on the Plasma D...

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2023 International Conference on Electronics and Devices, Computational Science, ICEDCS 2023

作者： Lin, Hai Su, Wei Chen, Ming Liu, Renhuai Jinan University School of Mechanics and Construction Engineering Guangzhou510632 China China Electronic Product Reliability and Environmental Testing Research Institute Sci. and Technol. on Reliability Phys. and Application Technology of Electronic Component Laboratory Guangzhou510610 China Moe Key Lab of Disaster Forecast and Control in Engineering Guangzhou510632 China

ISBN: (纸本)9798350343038

In this paper, a two-dimensional model of plasma diffusion in remote plasma source discharge chamber is established by COMSOL plasma module. The electron density and electron temperature distributions inside the discharge cavity were obtained by adjusting the thickness of alumina coating and the magnitude of RF power parameters. Based on the results, the authors discuss the effects of different alumina coating thickness and RF power on the electron density and electron temperature inside the discharge cavity, which provide theoretical guidance for the subsequent optimization of the internal structure of the discharge cavity and the discharge parameters. © 2023 IEEE.

关键词： Carrier concentration

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Study on Parameter Measurement of Thin Films with Substrate Effect Based on Contact Mechanics

SSRN

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SSRN 2023年

作者： Zhang, Wen-Hua MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China

The development of contact theories for film are valuable for high-precision machining and measurement. Herein, based on the constitutive equations and potential theory method, accurate contact mechanics theories of films under common indenter loading are established, where the film structures are "film with two free boundaries" and "film/rigid substrate". The displacement and stress at arbitrary position can be obtained with the exact solutions, which are represented by elementary functions. It is convenient for engineers applicating the theories when addressing contact problem of films. The influence of substrate effects and film parameters on contact radius and indentation depth was analyzed. It is found that Poisson’s ratio has little influence on indentation curves, which is mainly affected by the elastic modulus. An effective method for measurement of film material parameters is presented. With numerical software platforms, the analytic algorithm could be transformed into numerical codes and be integrated in special software. © 2023, The Authors. All rights reserved.

关键词： Constitutive equations

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Analyzing the Form-Finding of a Large-Span Transversely Stiffened Suspended Cable System: A Method Considering Construction Processes

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World Journal of engineering and Technology 2024年第2期12卷 229-244页

作者： Junyu Chen Yanfei Wang Ke Chen Shiqing Huang Xiaowen Xu MOE Key Lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou China China Construction Second Engineering Bureau Second Company Shenzhen China Department of Civil Engineering Dazhou Technician College Dazhou China Key Laboratory of Product Packaging and Logistics Packaging Engineering Institute College of Packaging Engineering Jinan University Zhuhai China

The precise control of the shape of transversely stiffened suspended cable systems is crucial. However, existing form-finding methods primarily rely on iterative calculations that treat loads as fixed known conditions. These methods are inefficient and fail to accurately control shape results. In this study, we propose a form-finding method that analyzes the load response of models under different sag and stress levels, taking into account the construction process. To analyze the system, a structural finite element model was established in ANSYS, and geometric nonlinear analysis was conducted using the Newton-Raphson method. The form-finding analysis results demonstrate that the proposed method achieves precise control of shape, with a maximum shape error ranging from 0.33% to 0.98%. Furthermore, the relationships between loads and tension forces are influenced by the deformed shape of the structures, exhibiting significant geometric nonlinear characteristics. Meanwhile, the load response analysis reveals that the stress level of the self-equilibrium state in the transversely stiffened suspended cable system is primarily governed by strength criteria, while shape is predominantly controlled by stiffness criteria. Importantly, by simulating the initial tensioning process as an initial condition, this method solves for a counterweight that satisfies the requirements and achieves a self-equilibrium state with the desired shape. The shape of the self-equilibrium state is precisely controlled by simulating the construction process. Overall, this work presents a new method for analyzing the form-finding process of large-span transversely stiffened suspended cable system, considering the construction process which was often overlooked in previous studies.

关键词： Cable Structure Long-Span Structure Form-Finding Analysis Finite Element Simulation Transverse Cable Stiffening System

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Effect of grain refinement induced by wire and arc additive manufacture (WAAM) on the corrosion behaviors of AZ31 magnesium alloy in NaCl solution

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Journal of Magnesium and Alloys 2023年第1期11卷 217-229页

作者： Jianwei LI Youmin QIU Junjie YANG Yinying SHENG Yanliang YI Xun ZENG Lianxi CHEN Fengliang YIN Jiangzhou SU Tiejun ZHANG Xin TONG Bin GUO School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001PR China Beijing Hangxing Machinery Manufacture Limited Corporation Beijing 100013PR China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632PR China The Third Academy of CASIC Beijing 100074PR China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou510632P.R.China Institute of Materials and Process Design Helmholtz-Zentrum HereonMax-Planck-Str.121502 GeesthachtGermany School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000PR China

Additive manufacturing(AM)of Mg alloys has become a promising strategy for producing complex structures,but the corrosion performance of AM Mg components remains *** this study,wire and arc additive manufacturing(WAAM)was employed to produce single AZ31 *** results revealed that the WAAM AZ31 was characterized by significant grain refinement with non-textured crystallographic orientation,similar phase composition and stabilized corrosion performance comparing to the cast *** varied corrosion behaviors were principally ascribed to the size of grain,where cast AZ31 and WAAM AZ31 were featured by micro galvanic corrosion and intergranular corrosion,respectively.

关键词： AZ31 magnesium alloy Wire and arc additive manufacturing(WAAM) Grain refinement Microstructure Intergranular corrosion

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Comparative studies on Structural Damage Detection using different kinds of Objective Functions based on Modal Data

Comparative studies on Structural Damage Detection using dif...

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International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS)

作者： Zepeng Chen Di Zhao School of Transportation and Civil Engineering & Architecture Foshan University Foshan China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

In order to investigate the ability of different objective functions based on modal data for SDD problems, six objective functions are defined and a comparison study is presented in this paper. To make a fair comparison, a quantified index name damage vector consistency is defined to describe the consistency between the identified damage vector factor and the assume one. Simply-supported beam with 10 finite elements is simulated which provides modal data generation and damage cases simulation. The percentage of DVC equaling to 100% in the all 100 times is also calculated which shows the objective function based on MTMAC is the best one for SDD.

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Full Characterization of the Work-Hardening Behavior of Metals:An Accurate and Explicit Approach

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Acta Mechanica Solida Sinica 2020年第4期33卷 479-486页

作者： Zan Zhou Siyu Wang Lin Zhan Huifeng Xi Heng Xiao School of Mechanics and Construction Engineering and MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou 510632China Shanghai Institute of Applied Mathematics and Mechanics&School of Mechanics and Engineering Science Shanghai UniversityShanghai 200072China

A new approach is proposed to characterize the work-hardening behavior of metals based on the stress-strain data from uniaxial extension *** this new approach,the yield strength as a function of the plastic work can be determined by directly fitting a wellchosen single-variable shape function to any given uniaxial data from the initial yielding up to the strength limit,in an explicit sense with no need to carry out the usual tedious trial-and-error procedures in treating nonlinear elastoplastic rate equations toward identifying numerous unknown *** examples show that the simulation results with the new approach are in accurate agreement with the test data.

关键词： Metals Elastoplasticity Finite strain Work-hardening Yield strength Strength limit Explicit characterization

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New finite strain elastoplastic equations for accurately and explicitly simulating pseudoelastic-to-plastic transition effects of shape memory alloys

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Applied Mathematics and Mechanics(English Edition) 2020年第10期41卷 1583-1596页

作者： Siyu WANG Lin ZHAN Huifeng XI Heng XIAO School of Mechanics and Construction Engineering MOE Key Lab of Disaster Forecast and Control in EngineeringJinan University601 West Huangpu AvenueGuangzhou 510632China Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China

A new finite strain elatoplastic J2-flow model with coupling effects of both isotropic and anisotropic hardening is proposed with the co-rotational logarithmic *** terms of certain single-variable shape functions representing uniaxial loading and unloading curves,explicit multi-axial expressions for the three hardening quantities incorporated in the new model proposed are derived in unified forms for the purpose of automatically and accurately simulating complex pseudoelastic-to-plastic transition effects of shape memory alloys(SMAs)under multiple loading-unloading *** examples show that with only a single parameter of direct physical meaning for each cycle,accurate and explicit simulations may be achieved for extensive data from multiple cycle tests.

关键词： shape memory alloy(SMA) finite deformation pseudo-elasticity plasticity cyclic loading transition effect elastoplastic equation explicit and accurate approach

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