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SSRN 2022年

作者： Yuan, Hong Fu, Xiao-Hui Fan, Ya-Chen Fu, Bing Zou, Qi-Qi School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518055 China

Fiber-reinforced polymer (FRP) composites have been increasingly used in various sectors, which inevitably results in an increasing amount of FRP waste to be dealt with. A recent study conducted by the author’s group explored a novel mechanical recycling method to process GFRP waste into small slender elements (referred to as "macro fibers") for reinforcing concrete, leading to so called "macro fibre reinforced concrete" (i.e., MFRC). The macro fibres recycled from waste FRP composites bridge the cracks in concrete and mitigate their development, thus enhancing the flexural strength and toughness of MFRC flexural members. However, the macro fibres have a negligible effect on the compressive properties of MFRC, which implies that the macro fibres in the compressive zone cannot be efficiently utilized. As motivated by the concept of the layered structure, this paper presents an experimental investigation on the flexural performance of the layered beams with the MFRC bottom layer and PC (plain concrete) top layer, expecting to improve the utilization of the incorporated macro fibres. The investigated test parameters include the height of the bottom layer as well as the macro fiber content in the bottom layer. The test results show that the application of layer structure effectively enhances the utilization of macro fibers and hence promotes the future technological application of the proposed mechanical recycling method. © 2022, The Authors. All rights reserved.

关键词： Fibers

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Actuated bending of a long cantilevered glassy nematic bilayer strip: Failure of the beam model

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engineering Research Express 2021年第2期3卷

作者： Lin, Y.L. He, L.H. MOE Key Lab of Disaster and Control in Engineering Jinan University Guangzhou510632 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei230026 China

Cantilevered long glassy nematic bilayer strips bend in response to light, and thus are attractive for actuation applications. The objective of this work is to examine whether the deformation can be predicted by the one-dimensional beam model as in usual practice. To do so, we consider a bilayer with orthogonal director orientations in the upper and lower layers and analyze its bending in the framework of the classical plate *** that the deflection is much larger than that given by the beam model, because the spontaneous bending in the width direction increases the curvature along the long axis. Therefore, the one-dimensional beam model fails to describe the bending behavior of the cantilevered bilayer strips. © 2021 IOP Publishing Ltd. © International Journal of Extreme Manufacturing.

关键词： Glass

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Computer transient simulation for dual in-line package through finite element analysis and ANASYS software 3

Computer transient simulation for dual in-line package throu...

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3rd International Conference on Electrical, Communication and Computer engineering, ICECCE 2021

作者： Su, Wei Luo, Wenhao Dong, Xianshan Chen, Si Tomar, Agam 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 Guangzhou China School of Mechanics and Construction Engineering Jinan University Guangzhou China Faculty of Engineering and Mathematical Sciences University of Western Australia Australia

The reliability of the DIP package is studied by numerical simulation. Firstly, the DIP package, fixture and metal steel are modeled. Based on this, variable thickness papers are laid on the sample. According to the experiment, corresponding excitation and boundary condition are set. Then, the transient analysis result of DIP package is obtained through numerical simulation. The results show the relation of different thickness papers and acceleration-time curve, which provides a beneficial reference for the optimization of DIP packing. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Transient analysis

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Harmonic response analysis for ball grid array package using computer finite element simulation 3

Harmonic response analysis for ball grid array package using...

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3rd International Conference on Electrical, Communication and Computer engineering, ICECCE 2021

BGA package is selected as the research object in this paper. Workbench (finite elemental analysis tool in ANSYS) is used for harmonic response analysis. The author lays several paper sheets on the sample and builds the finite element model of clamp, ceramic and metal plate. Then, the model analysis is carried out. Based on this, it is converted to harmonic response analysis. According to the results, the author has found that there is no relation between the number of paper sheets and acceleration-frequency result. It promotes the development of electronic packaging reliability. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Finite element method

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Finite element analysis of subsurface damage of optical glass after grinding 7

Finite element analysis of subsurface damage of optical glas...

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2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020

作者： Su, Wei Luo, Wenhao Dong, Xianshan Liu, Renhuai MOE Key Lab of Disaster Forecast and Control in Engineering Guangzhou510632 China Sci. and Technol. on Reliability Phys. 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

The interaction between abrasive particles and optical element surface can result in various forms of subsurface damage while removing the material. In order to obtain the stress distribution during optical glass grinding, the finite element analysis of optical glass grinding is carried out by using ANSYS software. The stress distribution of optical glass was obtained by establishing the grinding model of consolidated abrasive and free abrasive. The simulation results show that different abrasives have different damage degrees to the glass surface, which provides a useful reference for improving the quality of optical material processing technology. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Grinding (machining)

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Residual stress analysis of laser welding between output needle and helix 7

Residual stress analysis of laser welding between output nee...

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2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020

In order to obtain the welding stress of the output needle and helix, a finite element model is established and the mesh at the weld is refined to evaluate the welding residual stress. ANSYS parameter design language is used to simulate the motion load of welding heat source. Based on the exact calculation of the temperature field, the corresponding thermal units are converted into structural units to calculate the welding residual stress. Finally, the thermal stress distribution curve and residual stress distribution trend are obtained after post-treatment. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Residual stresses

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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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Method of Analyzing Coating Structure Under Conical Concave Contact

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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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Experimental analysis and prediction of mechanical properties of soft palate using machine learning 10

Experimental analysis and prediction of mechanical propertie...

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10th Australasian Congress on Applied Mechanics, ACAM 2021

作者： Chen, Liujie He, Chaobo Yao, Haodong Ng, Ching Tai Xiao, Tan Zhang, Xiangming School of Civil Engineering Guangzhou University Guangdong Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Guangdong Guangzhou China School of Civil Environmental & Mining Engineering The University of Adelaide SA Australia Center for Mechanical Teaching and Testing Guangdong University of Petrochemical Technology Guangdong Maoming China The sixth Affiliated Hospital of Sun Yat-sen University Guangdong Guangzhou China

ISBN: (纸本)9781925627596

The mechanical properties of the soft palate are nonlinear and anisotropic, which are important for explaining the occurrence of Obstructive Sleep Apnea Hypopnea Syndrome (OSAHS). The thick and hypertrophic soft palate in the upper airway cavity can easily lead to OSAHS. Therefore, understanding the mechanical properties of the soft palate is essential for further analysis of the mechanical mechanism of OSAHS. Previous studies on the mechanical properties of soft tissue established the constitutive relation between material deformation and internal force by constructing explicit function to fit experimental data for obtaining the related mechanical parameters. However, this process inevitably introduces errors and uncertainties, and some of the information in the data is lost. In this study, we used a pig soft palate as an example and carried out uniaxial tension and stress relaxation experiments for understanding the nonlinear and viscoelastic mechanical characteristics of the soft palate. Furthermore, the experimental data was used to construct the Multi-Layer Perceptron (MLP) model for studying the stress-strain relationship. To verify the proposed method, the predicted elastic modulus of the fitted data using the MLP model were compared with that calculated by the experimental data. The results show that the elastic modulus of soft palate predicted by MLP model is very close to that obtained by the experimental results. Therefore, the machine learning model based on MLP can provide a better prediction on the elastic modulus of the soft palate. In particular, there are three key findings: (i) the stress-strain curves of the soft palate with different sections have small variation and different sections have similar tensile properties;(ii) the soft palate has obvious stress relaxation phenomenon, and smaller magnitude of the initial stress has faster rate of decrease and larger reduction in stress over time;(iii) the initial stress of the soft palate is linearly c

关键词： Stress-strain curves

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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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