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SSRN 2022年

作者： Huang, Shi-Qing Tang, Pan-Jun Hou, Peng-Fei 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 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Department of Engineering Mechanics Hunan University Changsha410082 China

The evaluation of mechanical performance for a coating structure is important in the fields of mechanics and materials. The general theories of the contact mechanics for transversely isotropic elasticity coating structures under conical concave contact are presented in this paper. Based on the Green's function of semi-infinite bodies, the Green's function of coating structures are obtained with mirror image method. The general solution obtained indicates the displacement and stress at any position of the coating, substrate, and interface, which provide the code basis for the analysis of interface failure and determination of material parameters in numerical analysis software. This paper presents accurate solutions in the elastic stage, and there are stress singularities in the contact center and contact boundary, which provide a reference for future research on the relationships between stress singularities and plastic mechanical behavior. © 2022, The Authors. All rights reserved.

关键词： Finite element method

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Performance Enhancement of Recycled Coarse Aggregate Concrete by Incorporating with Macro Fibers Processed from Waste Gfrp

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SSRN 2023年

作者： Fu, Bing Xu, Guang-Ti Peng, Wei-Sen Huang, Jizhi Zou, Qiqi Kuang, You-Di School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China College of Water Conservancy and Civil Engineering South China Agricultural University Guangzhou510642 China Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518000 China School of Civil Engineering and Architecture Wuyi University Jiangmen529020 China

Reprocessing into coarse aggregates of concrete is a sustainable solution for the disposal of construction and demolition (C&D) waste. Use of recycled coarse aggregates however leads to a degradation in the mechanical properties of the resulting concrete, which then limits the use of recycled aggregates concrete (RAC) in structural elements. The incorporation of discrete fibers shows to be effective in eliminating the mechanical degradation problem of RAC, and this paper has therefore proposed to use macro fibers recycled from waste glass fiber reinforced polymer (GFRP) to reinforce RAC, thus improving the robustness of RAC in structural elements. The effect of macro fibers on the mechanical properties of RAC has been first examined through a series of compression and bending tests. Then, the tensile constitutive law of concrete was derived based on the load-deflection response of the beam specimens using an inverse analysis. The results revealed that the mechanical properties (e.g., compressive toughness, flexural strength, flexural toughness) of RAC can be significantly enhanced by the fiber addition. For concrete with 50% recycled aggregate (RA), the increase of macro fibers (from 0% to 0.5%, 1%, and 1.5%) leads to the enhancement of flexural strength from 3.13 MPa to 3.54, 4.69, and 5.97 MPa, and the toughness (T150) from 1.4 J to 35.5, 59.2 and 77.6 J, respectively. Such enhancements in the mechanical properties of RAC demonstrate the feasibility of the proposed method. © 2023, The Authors. All rights reserved.

关键词： Bending strength

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Enhancing the Tribological Properties of Ta1 Titanium Alloy Via Surface Mechanical Composite Strengthening

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SSRN 2022年

作者： Dai, Yan Li, Mao Kun Liu, Gang Ou, Gui Mei Yang, Feng Liu, Jing School of Materials and Architectural Engineering Guizhou Normal University Guiyang550025 China School of Materials and Metallurgy Guizhou University Guiyang550025 China Institute of Advanced Wear & Corrosion Resistance and Functional Materials MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China

The main factor hindering the application of TA1 titanium alloy is its poor wear resistance. In this study, surface mechanical composite strengthening technology was proposed to prepare a gradient structure composite layer on the surface of TA1 titanium alloy to enhance the friction and wear properties. Experimental results show that the gradient structure composite layer can be effectively prepared using the surface mechanical composite strengthening technology on the surface of TA1 titanium alloy. Moreover, the microstructure and properties of the composite-strengthening layer were characterised using scanning electron microscopy, X-ray diffraction, electron backscatter diffraction, metallography microscopy, micro-scratch and friction wear tester . The composite-strengthening layer comprised an ~60-μm-thick mechanical deformation layer and a 20-μm-thick WC ( Tungsten Carbide , WC) particle-reinforced coating that formed a mechanical bond with the matrix. The mechanical deformation layer comprised the surface fine-grain zone and subsurface deformation twinning. The nano-hardness of the coating area is 21.771 GPa, ~8.3 times the TA1 matrix nano -hardness. Under the same conditions, the wear rate of the composite-strengthening layer is 4.03 × 10−4 (mm3·N−1·m−1), which is only 24.8% of the matrix wear rate. The wear mechanisms of the composite-strengthening layer are mainly abrasion wear and oxidation wear. The formation of the composite-strengthening layer improves the friction and wear properties of the TA1 titanium alloy. © 2022, The Authors. All rights reserved.

关键词： Wear resistance

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Strengthening Layer with Nano-Twins in Titanium Alloy Induce by Laser Surface Re-Melting: Mechanism of High Strength and Ductility

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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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Mathematical modelling of axonal microtubule bundles under dynamic torsion

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applied Mathematics and mechanics(English Edition) 2018年第6期39卷 829-844页

作者： J.Y.WU Hong YUAN L.Y.LI MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied MechanicsJinan University School of Engineering University of Plymouth

Owing to its viscoelastic nature, axon exhibits a stress rate-dependent me- chanical behavior. An extended tension-shear chain model with Kelvin-Voigt viscoelas- ticity is developed to illustrate the micromechanical behavior of the axon under dynamic torsional conditions. Theoretical closed-form expressions are derived to predict the de- formation, stress transfer, and failure mechanism between microtubule （MT） and tau protein while the axon is sheared dynamically. The results obtained from the present an- alytical solutions demonstrate how the MT-tau interface length, spacing between the tau proteins, and loading rate affect the mechanical properties of axon. Moreover, it is found that the MTs are more prone to rupture due to the contributions from the viscoelastic effects. Under the torsional force, the MTs are so long that the stress concentrates at the loaded end where axonal MTs will break. This MT-tau protein dynamics model can help to understand the underlying pathology and molecular mechanisms of axonal injury. Additionally, the emphasis of this paper is on the micromechanical behavior of axon, whereas this theoretical model can be equally applicable to other soft or hard tissues, owning the similar fibrous structure.

关键词： torsion biocomposite diffuse axonal injury （DAI） Kelvin-Voigt viscoelas-tic model dynamic response tension-shear chain model

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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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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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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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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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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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