检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Li, Kunmao Liu, Xiaochun Liu, Yujing Wu, Xiang Zhang, Wencai Yang, Junjie Li, Wei Zhou, Shengfeng Institute of Advanced Wear & Corrosion Resistance and Functional Materials MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China Hunan Changsha410004 China Department of Orthopedics First Affiliated Hospital Jinan University Guangzhou510632 China The state Key Laboratory of Mechanical Transmissions Chongqing University Chongqing400044 China

To increase the strength of titanium (Ti) alloys, severe plastic deformation techniques are usually adopted to refine their grain structure, but these methods have long processing cycle, high cost, and easily result in the oxidized of Ti alloys. This work proposes a strategy of laser surface re-melting (LSR) as-cast TC4-1Cu alloy, which can refine its grain into ~63 nm at relatively lower costs and short manufacturing cycle. By forming a thin strengthening layer with a thickness of ~60 μm, the yield strength and tensile strength of the as-cast TC4-1Cu alloy are increased by 28% and 35%, respectively. More importantly, the {10-11} nano-twinned system is activated due to the tensile stress, thereby accommodating plastic strain and producing excellent strain hardening. These improvements in properties are attributed to the surface strengthening layer with nano-twins and the homogenized elemental distribution, which can provide important implications for studying how to address the strength-ductility trade-off in as-cast Ti alloys. © 2022, The Authors. All rights reserved.

关键词： Titanium alloys

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The mechanical mechanism and plastic hinge behavior of novel precast prestressed steel reinforced concrete composite frames with PVA fiber-reinforced ECC cast-in-place joints subjected to monotonic load

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Structures 2025年 79卷

作者： Jing Ji Xuan Chu Liangqin Jiang Zhanbin Zhang Xiaomeng Hou Pengguang Qi Heilongjiang Key Lab of Disaster Prevention Mitigation and Protection Engineering Northeast Petroleum University Daqing 163319 China Heilongjiang Provincial Key Laboratory of Thermal Utilization and Disaster Reduction of New Energy in Cold Regions Northeast Petroleum University Daqing 163319 China Key Laboratory of Structural Disaster and Control of the Ministry of Education Harbin Institute of Technology Harbin 150040 China

In this paper, a novel type of precast prestressed steel reinforced concrete composite frames with PVA fiber-reinforced engineering cementitious composites (PVA-ECC) cast-in-place joints (PSCEFs) is systematically proposed. It consists of precast prestressed steel reinforced concrete beams (PSRCBs), precast small-diameter concrete-filled steel tube gradient strength composite columns (SGCCs), and PVA-ECC cast-in-place joints. To investigate the stress mechanism of the PSCEFs under monotonic loading, refined three-dimensional finite element models of 15 PSCEFs and 2 precast prestressed steel reinforced concrete composite frames with ordinary concrete cast-in-place joints (PSCCFs) are established based on the nonlinear constitutive models of several materials and the geometric nonlinearity of structures. The rationality of the modeling method is well verified by referring to existing tests. The effects of different parameters on the ultimate bearing capacity, ductility, and initial stiffness for PSCEFs are studied, and the results indicate that the stirrup characteristic value ( λ v ) and axial compression ratio ( n ) of SGCCs have a remarkable impact on the ultimate bearing capacity of PSCEFs. The displacement ductility coefficients of PSCEFs are mainly above 4.0, and the initial stiffness is about 15 % higher than that of PSCCFs, so PSCEFs have better ductility and suitable deformation resistance. By comparing the collapse resistance and failure modes for typical specimens of PSCEFs and PSCCFs, it is discovered that the joints poured with PVA-ECC can effectively control the range of plastic strain distribution in the frames. The yield lengths of shaped steel, steel reinforcement, and concrete in PSCEFs are reduced by approximately 5–20 % compared to those of PSCCFs. The failure characteristics and plastic hinges law of PSCEFs are systematically summarized, and the plastic hinge length prediction models with an error of less than 10 % are proposed by introducing seve

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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

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

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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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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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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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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Ultimate strength analysis of local thinning tee pipe considering plastic strengthening effect

Ultimate strength analysis of local thinning tee pipe consid...

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2020 International Conference on Applied Physics and Computing, ICAPC 2020

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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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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Three-body problem – from Newton to supercomputer plus machine learning

arXiv

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arXiv 2021年

作者： Liao, Shijun Li, Xiaoming Yang, Yu State Key Lab of Ocean Engineering Shanghai200240 China Center of Marine Numerical Experiment School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai200240 China School of Physics and Astronomy Shanghai Jiaotong University Shanghai200240 China School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China MOE Key Laboratory of Disaster Forecast and Control in Engineering Guangzhou510632 China

The famous three-body problem can be traced back to Newton in 1687, but quite few families of periodic orbits were found in 300 years thereafter. In this paper, we propose an effective approach and roadmap to numerically gain planar periodic orbits of three-body systems with arbitrary masses by means of machine learning based on an artificial neural network (ANN) model. Given any a known periodic orbit as a starting point, this approach can provide more and more periodic orbits (of the same family name) with variable masses, while the mass domain having periodic orbits becomes larger and larger, and the ANN model becomes wiser and wiser. Finally we have an ANN model trained by means of all obtained periodic orbits of the same family, which provides a convenient way to give accurate enough predictions of periodic orbits with arbitrary masses for physicists and astronomers. It suggests that the high-performance computer and artificial intelligence (including machine learning) should be the key to gain periodic orbits of the famous three-body problem. © 2021, CC BY.

关键词： Supercomputers

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Transient Analysis Based on Finite Element Method for Ball Grid Array Package

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IOP Conference Series: Earth and Environmental Science 2021年第4期769卷

作者： Wenhao Luo Wei Su Xianshan Dong Zhenhua Nie Agam Tomar MOE Key lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou China Faculty of Engineering and Mathematical Sciences University of Western Australia MOE Key lab of Disaster Forecast and Control in Engineering Perth Australia

In this paper, finite element simulation is carried out for BGA sample. The authors establishes the model of fixture, ceramic panel and metal sheet. Based on this model, several layers papers are laid on the metal sheet for simulation test. Then, ANASYS Workbench is used to conduct transient analysis of the samples to study the influence of different thickness papers on acceleration and time. The results provide useful reference for the adjustment of dynamic response parameters.

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