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2020 International Conference on Applied Physics and Computing, ICAPC 2020

作者： Su, Wei Luo, Wenhao Dong, Xianshan Liu, Renhuai MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou 510632 China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability Environmental Testing Research Institute Guangzhou510610 China School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China

In this paper, the locally thinned three-way structure under internal pressure is analyzed based on the theory of plastic strengthening effect and limit analysis. A finite element model is presented through ANSYS commercial software to simulate the mechanical properties of orthogonal and oblique three-way structures. This paper systematically analyses how the shape and size of the thinning effect the plastic limit load of the pipe and what is the typical failure mode of plastic failure. Some valuable conclusions are drawn, which provide a useful reference for the design and production of the tee pipe. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Finite element method

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Ultimate strength analysis of three-way pipe considering plastic reinforcement effect

Ultimate strength analysis of three-way pipe considering pla...

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2020 International Conference on Applied Physics and Computing, ICAPC 2020

Considering the plastic reinforcement effect in materials, the plastic limit load of the three-way structure is analyzed. ANSYS commercial finite element software is used for numerical simulation. According to the results, the paper discusses the influence of the plastic reinforcement effect on the pipe's plastic ultimate load and failure mode. And the structure is further analyzed to verify the theory and design ideas in actual engineering. For improving the design and safety assessment of the three-way structure, the results provide a theoretical basis and a numerical reference, and the finite element method is economical than the experimental method. At last, it satisfies the accuracy requirements of engineering. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Finite element method

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Wave soldering structure optimization simulation of multilayer ceramic capacitors

Wave soldering structure optimization simulation of multilay...

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2020 International Conference on Applied Physics and Computing, ICAPC 2020

作者： Su, Wei Luo, Wenhao Li, Junkui Liu, Renhuai MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou510632 China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou510610 China School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China

In this paper, the thermal analysis and structural analysis of MLCC are carried out by using the commercial finite element software ANSYS. By comparing the thermal-mechanical analysis results of the structural optimization models of different schemes, the optimal optimization scheme is found. The model calculated the time required for MLCC to reach temperature stability considering thermal convection and heat conduction, and obtained the thermal deformation and thermal stress distribution of MLCC element. Based on the analysis results of MLCC original model, the thermal analysis under different wave soldering temperatures was carried out. Based on the simulated transient results, the structure and materials of MLCC key components were optimized. The results provide a basis for the optimal design of MLCC. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Thermoanalysis

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Structural damage detection using relationship between transmissibility functions and stiffness variations 9

Structural damage detection using relationship between trans...

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9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019

作者： Liu, H.L. Chen, Z.P. Yu, L. School of Mechanics and Construction Engineering Jinan University Guangzhou China Moe Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

Structural damage detection (SDD), as one of the most challenging issues in the field of structural health monitoring (SHM), has been extensively studied in recent years. A lot of methodologies have been proposed for effective SDD. However, in most cases, only structural responses, e.g. accelerations, can be easily measured in practical engineering, which limits the application of numerous SDD algorithms. In this study, a novel SDD method is proposed for damage localization and quantification by means of a newly deduced relationship between transmissibility functions (TFs) and stiffness variations. First, a finite element (FE) model is developed for a real structure, and only stiffness variations are esteemed when structural damages occur in the structure. As a ratio between frequency response functions of structural responses, the TFs are used to detect damages by using structural responses only. Moreover, as prior information, the sparsity of structural damages is introduced and the sparse regularization is employed to improve the reasonability of SDD results. Finally, numerical simulations on damages in a simply-supported beam are conducted to assess the performance of the proposed SDD method. The illustrated SDD results show that the proposed method can effectively locate structural damages and quantify damage severities with a good robustness to measurement noises. Copyright © SHMII 2019. All rights reserved.

关键词： Structural health monitoring

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Online structural damage detection based on online dictionary learning 9

Online structural damage detection based on online dictionar...

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9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019

作者： Chen, Z.P. Yu, L. School of Mechanics and Construction Engineering Jinan University Guangzhou China Moe Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

In order to detect the variation of stiffness in structures, an online structural damage detection (SDD) method is proposed based on online dictionary learning (ODL) in this paper. The acceleration responses of structures are measured as training data to determine an adaptive dictionary which gives sparse representation for the acceleration responses. In the process of ODL, the dictionary is able to be determined in an iterative manner, which means that the dynamically changing data can be used to update the dictionary sequentially. Then, the mean sparsity (MS) is applied as a damage-sensitive index to indicate the occurrence of damage, which therefore formulates a framework to identify structural damage instantaneously. The accuracy of SDD results is investigated based on the proposed online SDD algorithm under random load. Numerical simulations on structural damages of a simply-supported beam are conducted and the SDD results illustrate the effectiveness of the proposed methods for determining whether and when damage emerges. Moreover, as the proposed method is adaptive and model-free method, it provides a wide application prospect in online SDD of real structures. Copyright © SHMII 2019. All rights reserved.

关键词： Structural health monitoring

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Microstructure, Wear and Friction Behavior of Cocraltay-Xcnts Composite Coatings Deposited by Laser-Induction Hybrid Cladding

SSRN

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SSRN 2022年

作者： Zhou, Shenfeng Tingjin, Xie Rui, Zhang Yanliang, Yi Institute of Advance Wear & Corrosion Resistant and Functional Materials Jinan University Guangdong Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China Laser Technology Institute School of Physical science and Technology Tianjin University of Technology Tianjin300387 China Shaoguan Research Institute of Jinan University 168 Muxi Avenue Shaoguan512027 China

Through this design, partial CNTs occur chemical reactions to create a reinforcement phase, while the other CNTs can be retained as lubrication phase. The MCrAlYTa-xCNTs (x=0,1,2,and 4 wt%) composite coatings were prepared by laser-induction hybrid cladding (LIHC). And the microstructure, hardness, and wear behaviour of coating were systematacially analyzed. Results show that the composite coatings are mainly composed of TaC, γ-(Co,Cr) and β-(Co,Cr)Al. With the increase of CNTs content, the volume fraction of TaC increases from 13.11 vol% to 16.12 vol%. Meanwhile, the nanohardnesses of γ-(Co,Cr) and β-(Co,Cr)Al are improved from 7.49 GPa to 9.36 GPa and 9.72 GPa to 11.19 GPa, respectively. As a result, the microhardness of coating increases from 536.25 HV to 738.16 HV, the wear rate decreases from 32.4×10-3 mg·m-1 to 6.1×10-3 mg·m-1, and the average friction coefficient decreases from 0.55 to 0.44. The good wear performance of the coating is attributed to the increased TaC and the CNTs lubricant film. © 2022, The Authors. All rights reserved.

关键词： Carbon nanotubes

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Matrix regularization-based method for large-scale inverse problem of force identification

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2020年 140卷 106698-000页

作者： Pan, Chudong Ye, Xijun Zhou, Junyong Sun, Zhuo Guangzhou Univ Sch Civil Engn Guangzhou Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China

Identification of force via structural responses has been widely studied due to the force is always difficult or even impossible to be measured directly. Force identification is a typical ill-posed problem. To overcome this drawback, regularization methods have been widely studied. However, existing regularization methods used for force identification belong to the vector-based method, in which unknown force and structural responses are organized in two vectors, respectively. This characteristic decides that the identified process of a long-duration problem will be time-consuming because the size of system matrix is large. In view of this, a novel matrix regularization-based method is proposed for force identification in this paper. Combing with moving time windows, the structural responses are extracted and organized in a form of matrix. A system matrix is formulated by considering both unknown force and unknown initial conditions. Then a governing equation is established, in which structural excitation sources such as force and initial condition are orderly stored in a form of matrix. To obtain a stable solution, matrix regularization is introduced for improving the matrix-based governing equation. Herein, the sparse penalty term is considered as the sum of absolute values of elements in the matrix of excitation sources. Fast iterative shrinkage-thresholding algorithm (FISTA) is applied for solving the matrix regularization model. The regularization parameter is selected according to Bayesian information criterion (BIC). Finally, numerical simulations and experimental studies are carried out for assessing the feasibility and effectiveness of the proposed method. Illustrated results show that the proposed method is effective and time-saving. It can use a system matrix with a relatively small size to dealing with a large-scale problem of force identification. Some related issues are discussed as well. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Force identification Matrix regularization Sparse regularization Inverse problem Moving time window

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On the periodic solutions of the three-body problem

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National Science Review 2019年第6期6卷 1070-1071页

作者： Shijun Liao Xiaoming Li Advanced Center of Computing School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong University School of Physics and Astronomy Shanghai Jiao Tong University MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University

The motion of three bodies that attract each other by universal gravitation was first investigated by Newton [1] and was reconsidered by many great mathematicians and scientists, including Euler, Lagrange, Poincaré [2] and Hilbert. The famous three-body problem has had a great influence on physics, mathematics and non-linear dynamics. It has led to a new

关键词： On the periodic solutions of the three-body problem

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Seismic behavior of large-scale FRP–recycled aggregate concrete–steel columns with shear connectors

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Earthquake engineering and engineering Vibration 2019年第4期18卷 823-844页

作者： Zeng Lan Li Lijuan Yang Xianqian Liu Feng School of Civil and Transportation Engineering Guangdong University of Technology Guangzhou 510006 China MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou 510632 China Architectural Design and Research Institute of Guangdong Province Guangzhou 510000 China

The application of fi ber-reinforced polymer (FRP) composites for the development of high-performance composite structural systems has received signifi cant recent research attention. A composite of FRP–recycled aggregate concrete (RAC)–steel column (FRSC), consisting of an outer FRP tube, an inner steel tube and annular RAC fi lled between two tubes, is proposed herein to facilitate green disposal of demolished concrete and to improve the ductility of concrete columns for earthquake resistance. To better understand the seismic behavior of FRSCs, quasi-static tests of large-scale basalt FRSCs with shear connectors were conducted. The infl uence of the recycled coarse aggregate (RCA) replacement percentage, shear connectors and axial loading method on the lateral load and deformation capacity, energy dissipation and cumulative damage were analyzed to evaluate the seismic behavior of FRSCs. The test results show that FRSCs have good seismic behavior, which was evidenced by high lateral loads, excellent ductility and energy dissipation capacity, indicating RAC is applicable in FRSCs. Shear connectors can signifi cantly postpone the steel buckling and increase the lateral loads of FRSCs, but weaken the deformation capacity and energy dissipation performance.

关键词： recycled aggregate concrete (RAC) fi ber-reinforced polymer (FRP) FRP–RAC–steel column (FRSC) shear connector seismic behavior

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In-plane mechanical properties of a novel hybrid auxetic structure

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SMART MATERIALS AND STRUCTURES 2022年第7期31卷 075003-075003页

作者： Fan, Peng Chen, Yu Xiong, Jian Hu, Hong Hong Kong Polytech Univ Inst Text & Clothing Hong Kong Peoples R China Harbin Inst Technol Ctr Composite Mat & Struct Harbin Peoples R China Xi An Jiao Tong Univ Dept Engn Mech State Key Lab Strength & Vibrat Mech Struct Soft Machines Lab Xian Peoples R China Jinan Univ Coll Packaging Engn Packaging Engn Inst Zhuhai Peoples R China Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China

This paper presents a novel hybrid auxetic structure with enhanced mechanical properties, combining the re-entrant and double-arrowhead structures, based on the structural stretching-dominated deformation mechanism. The unit cell of the developed hybrid structure comprises an external quadrilateral frame and an internal arrowhead part. The theoretical analysis model for predicting its in-plane mechanical properties in the two principal directions is presented and verified by both numerical simulations and experimental measurements. On this basis, a parametric study on the in-plane mechanical properties of the hybrid structure is performed to optimize geometrical parameters. The results show that both the negative Poisson's ratio behavior and the elastic properties of the hybrid structure can be enhanced by increasing the length of the vertical wall or reducing the angle of the inclined wall in the internal arrowhead part. The hybrid structure, with the obvious difference in elastic properties between the two principle directions, can be obtained by individually adjusting the width of the hybrid unit cell, while the elastic properties in bothdirections can be improved by simultaneously reducing the length of the vertical wall and the width of the hybrid unit cell. In addition, compared with the re-entrant and double-arrowhead structures, the hybrid structure demonstrates higher elastic moduli and a wider range of Poisson's ratios from negative to positive. The study provides guidance for the optimized design of hybrid auxetic structures in practical applications.

关键词： auxetic structure negative Poisson's ratio mechanical properties

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