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A highly stretchable and sensitive carboxymethyl chitosan-based hydrogel for flexible strain sensors

JOURNAL OF MATERIALS CHEMISTRY C 2023年第44期11卷 15720-15730页

作者： Liu, Haote Cao, Lin Wang, Xiao Xu, Congjie Huo, Haoling Jiang, Bixia Yuan, Hong Lin, Zhidan Zhang, Peng Jinan Univ Inst Adv Wear & Corros Resistant & Funct Mat Guangzhou 510632 Peoples R China Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Guangzhou Inst Sci & Technol Sch Architectural Engn Guangzhou 510540 Peoples R China

It is essential to diagnose Parkinsonism at an early stage to prevent functional impairments in patients and improve their level of healthcare. However, low electrical signal transmission and poor stretchability limit the application of flexible hydrogel sensors in the early diagnosis of Parkinsonism. CGTX-IX composite hydrogels were prepared using carboxymethyl chitosan (CMCS), glyoxal, tannic acid (TA), and ionic liquid ([BMIM][Cl]). The CGTX-I3 composite hydrogel has reversible dynamic chemical bonds, such as imine and hydrogen bonds, and physical interactions. It exhibits good mechanical properties (elongation at break of 112.5% and tensile strength of 284.4 kPa) and excellent electrical conductivity (1.16 x 10-3 S cm-1). Moreover, CGTX-I3 composite hydrogels have excellent adhesion to commonly used substrate materials, especially human skin (130.9 kPa). The CGTX-I3 hydrogel can also detect the deformation caused by an external force and human movements, such as finger bending, elbow movement, wrist movement, ankle movement, and other subtle human actions (such as swallowing and smiling). After 1000 cycles, the sensor can still maintain a stable sensitivity factor (GF = 2.14). It is essential to diagnose Parkinsonism at an early stage to prevent functional impairments in patients and improve their level of healthcare.

关键词： Hydrogels

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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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Effect of trigger system on experimental dispersion characteristics of active surface wave testing

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Earthquake engineering and engineering Vibration 2024年第2期23卷 311-318页

作者： Lin Shibin Jeramy C.Ashlock Zhu Liming Qin Zexiang Li Bo Zhu Xingji Zhai Changhai State Key Laboratory of Precision Blasting Jianghan UniversityWuhan 430056China Hubei Key Laboratory of Blasting Engineering Jianghan UniversityWuhan 430056China Department of Civil Construction&Environmental EngineeringIowa State UniversityAmesIA 50010USA Wuhan Airport Road Development Co. Ltd.Wuhan 430065China School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disaster of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

A trigger system is typically employed in active seismic testing to trigger and synchronize multichannel surface wave data *** effect of the trigger system on the dispersion image of surface waves is empirically known to be negligible,however,theoretical explanation regarding the effect of the trigger system is *** study systematically examines the theory for surface wave dispersion analysis and proves that the effect of the trigger system on a dispersion image is negligible via a solid theoretical ***,based on the new theoretical explanation,an alternative method that uses only the relative phase difference between sensors to extract dispersion characteristics with better conceptual clarity is *** active surface wave testing cases are considered to validate the theory and *** results indicate that(1)an accurate trigger system is not necessary for surface wave data acquisition,and(2)it is unnecessary to assume that the impact point is the generation point of the surface waves for the experimental dispersion analysis.

关键词： site investigation surface waves data acquisition dispersion

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Parameter-free strain-energy function which automatically and accurately matches benchmark test data for soft elastic solids

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MULTIDISCIPLINE MODELING IN MATERIALS AND STRUCTURES 2022年第1期18卷 129-141页

作者： Xiao, Heng Yan, Wei-Hao Zhan, Lin Wang, Si-Yu Jinan Univ Sch Mech & Construct Engn Guangzhou Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China Zhejiang Univ Sch Mech & Areonaut & Aerosp Engn Hangzhou Peoples R China

Purpose A new and explicit form of the elastic strain-energy function for modeling large strain elastic responses of soft solids is constructed based on Hencky's logarithmic strain tensor. Design/methodology/approach Well-designed invariants of the Hencky strain are introduced for characterizing deformation modes and, furthermore, a new interpolating technique is proposed for combining piecewise splines into a single smooth function. Findings With this new form and this new technique, objectives in three respects may be achieved for the first time. Originality/value First, no adjustable parameters need to be treated. Second, large strain responses for three benchmark modes are derivable in a decoupled sense without involving strongly nonlinear coupling effects. Finally, large strain data may be automatically and accurately matched for three benchmark modes, including uniaxial, equi-biaxial and plane-strain extension. Numerical examples are presented and compared with usual approaches.

关键词： Soft solids Large deformation Benchmark tests Strain-energy function Explicit approach

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Advanced modeling of the absorption enhancement of black carbon particles in chamber experiments by considering the morphology and coating thickness

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Frontiers of Environmental Science & engineering 2024年第9期18卷 129-142页

作者： Xiaodong Wei Jianlin Hu Chao Liu Xiaodong Xie Junjie Yin Song Guo Min Hu Jianfei Peng Huijun Wang Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Key Laboratory of Meteorological Disaster(Ministry of Education)Nanjing University of Information Science and TechnologyNanjing 210044China Nansen−Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China East China Air Traffic Management Bureau CAAC Shanghai 200335China State Key Joint Laboratory of Environmental Simulation and Pollution Control International Joint Laboratory for Regional Pollution Control(IJRC)(Ministry of Education)College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Tianjin Key Laboratory of Urban Transport Emission Research&State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and EngineeringNankai UniversityTianjin 300071China

Measurements studies have shown that the absorption of radiation by black carbon(BC)increases as the particles ***,there are significant discrepancies between the measured and modeled absorption enhancement(E_(abs)),largely due to the simplifications used in modeling the mixing states and shape *** took advantage of chamber experiments on BC aging and developed an efficient method to resolve the particle shape based on the relationship between the coating fraction(ΔD_(ve)/D_(ve),0)and fractal dimension(D_(f)),which can also reflect the variations of D_(f)during the whole BC aging *** with externally and partly mixed states(0≤ΔD_(ve)/D_(ve),0≤0.5)can be considered to be uniformly distributed with the D_(f)values of 1.8–2.1,whereas the Df values are constrained in the range 2.2–2.8 for fully mixed states(ΔD_(ve)/D_(ve),0>0.5).The morphological parameters(i.e.,the effective density and the dynamic shape factor)were compared with the measured values to verify the simulated *** simulated mean deviations of morphological parameters were smaller than 8%for the method resolving the particle *** applying a realistic shape and refractive index,the mass absorption cross for fully mixed states can be improved by 11%compared with a simplified core–shell *** on our understanding of the influence of D_(f)andΔD_(ve)/D_(ve),0 on E_(abs),we propose a two-stage calibration equation to correct the E_(abs)values estimated by the core–shell model,which reduces the simulation error in the Mie calculation by 6%–14%.

关键词： Black carbon Mixing states Fractal dimension Dynamic shape factor Absorption enhancement

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A new approach for non-Gaussian vibration analysis of hyperbolic tangent package with a critical component

A new approach for non-Gaussian vibration analysis of hyperb...

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作者： Yang, Song-Ping Su, Ri-Qing Wang, Zhi-Wei Chen, Yu Packaging Engineering Institute College of Packaging Engineering Jinan University Zhuhai China MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou China Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes Jinan University Zhuhai China International Energy College/Energy and Electricity Research Center Jinan University Zhuhai China

A new approach is proposed to analyze the non-Gaussian random vibration of hyperbolic tangent package. Firstly, the non-Gaussian vibration noise of specified mean, variance, skewness, and kurtosis is developed by Hermite polynomial and verified by Gaussian mixture model theory. Secondly, next to analyzing an analytical and numerical response of the two degrees of freedom linear package, the acceleration response of the two degrees of freedom hyperbolic tangent package system under non-Gaussian vibration excitation is obtained though the Hermite polynomial and Runge–Kutta method, and the effects of the external excitation and system parameters are investigated. Finally, on the basis of the first-passage probability of the acceleration response, the reliability analysis method is introduced. The analysis provides a guidance to the vibration reliability analysis and packaging optimization design. © 2022 John Wiley & Sons Ltd.

关键词： Reliability analysis

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Research on the Application of Small Caliber Pilot Jacking Method Under Silt Geology 1

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9th International Conference on Civil engineering, ICCE 2022

作者： Wu, Qixing Huang, Jieming Li, Qijun Liu, Haoran School of Mechanics and Construction Engineering Jinan University Guangdong Guangzhou510632 China MOE Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangdong Guangzhou510632 China Foshan Sanxin Municipal Engineering Co. Ltd. Guangdong Foshan528000 China

ISBN: (数字)9789819925322

ISBN: (纸本)9789819925315

With the rapid development of urban scale in China, the number of drainage pipes and new construction has also increased rapidly, and pipeline maintenance and new not suitable for excavation construction and silt formation construction due to limited space, and introduce the working principle, construction design, construct construction are facing problems such as environmental protection and narrow construction sites. The use of small-diameter pilot top pulling method can effectively overcome the difficulties of drainage pipeline projects in bustling urban areas that areion process and process of the construction method. Combined with the construction example of a small-caliber pilot top pull method of a drainage pipeline project in Zhongshan City, it shows that the construction technology has the advantages of high precision, space saving, small environmental impact and can be constructed on narrow roads, which can provide reference for similar projects and has greater promotion and application significance. © 2023, The Author(s).

关键词： Drainage

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Baseline-free structural damage detection using PCA- Hilbert transform with limited sensors

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JOURNAL OF SOUND AND VIBRATION 2024年 568卷

作者： Nie, Zhenhua Li, Fuquan Li, Jun Hao, Hong Lin, Yizhou Ma, Hongwei Jinan Univ Coll Sci & Engn Guangzhou Guangdong Peoples R China Key Lab Disaster Forecast & Control Engn Guangzhou Guangdong Peoples R China Curtin Univ Ctr Infrastruct Monitoring & Protect Sch Civil & Mech Engn Kent St Bentley WA 6102 Australia Guangzhou Univ Earthquake Engn Res & Test Ctr Guangzhou Peoples R China Dongguan Univ Technol Dongguan Peoples R China

Conventional vibration-based damage identification methods need a large number of sensors on the bridge to identify the structural modal information and rely on the response data of bridges under a non-damage state for comparison, which restricts their implementations in the health monitoring of bridge structures in service. This paper proposes a baseline-free structural damage detection method based on limited sensor information. The proposed method uses the Hilbert transform combined with principal component analysis (PCA) to locate the damage. Firstly, PCA is performed on the displacement response data matrix of the bridge under a moving load to obtain the principal component matrix. According to the physical interpretation of PCA of the responses of a beam-like bridge under a moving load, each column of the principal component matrix, namely the principal component, composes of a mode shape and the dynamic information at this modal frequency of the bridge. The dynamic information of the modal frequency is indirectly obtained by filtering out the mode shape by low pass filter. Then the Hilbert transform is used to process the dynamic component information to receive the instantaneous frequency which is regarded as the damage index. When the structure is damaged, the first instantaneous frequency at the damaged location changes abruptly. To demonstrate the effectiveness and performance of the proposed method, numerical simulations and experimental validations on beam bridge models are conducted. The results show that the method is free from the requirement of the information of bridges under the undamaged state, and only limited sensors are needed to locate the damage.

关键词： Structural damage identification Baseline-free Limited sensors Principal component analysis Hilbert transform Instantaneous frequency

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Transient Thermoelastic Analysis of Rectangular Plates with Time-Dependent Convection and Radiation Boundaries

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BUILDINGS 2023年第9期13卷 2174页

作者： Zhang, Zhong Sun, Ying Xiang, Ziru Qian, Wangping Shao, Xuejun Nantong Univ Sch Transportat & Civil Engn Nantong 226019 Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China Southwest Jiaotong Univ Sch Civil Engn Chengdu 610031 Peoples R China Nantong Municipal Facil Management Dept Nantong 226001 Peoples R China

Approximate analytical solutions are presented for the transient thermoelastic problem of rectangular plates with time-dependent convection and radiation boundaries. To include the nonlinear radiation boundary, the whole heating process is divided into several time steps, and a linearized approximation is used to simplify the radiation term for each step. The one-dimensional transient temperature along the thickness direction is solved using the technique of the separation of variables. The displacement and stress solutions are obtained by applying the state-space method to the three-dimensional thermoelasticity equations. The accuracy of the present solutions is demonstrated by comparison with the reported results in the open literature and the finite element solutions. In the numerical examples, two kinds of thermal boundaries, namely, time-independent convection boundaries and time-dependent convection and radiation boundaries, are considered to show the availability of the present solutions.

关键词： rectangular plate radiation boundary separation of variables thermoelasticity analytical solution

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Realistic hardening-to-softening transition effects of metals over the finite strain range up to failure

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MULTIDISCIPLINE MODELING IN MATERIALS AND STRUCTURES 2021年第3期17卷 525-536页

作者： Xu, Zi-Han Zhan, Lin Wang, Si-Yu Xi, Hui-Feng Xiao, Heng Jinan Univ Coll Mech & Construct Engn Guangzhou Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China

Purpose A new approach is proposed toward accurately matching any given realistic hardening and softening data from uniaxial tensile test up to failure and moreover, toward bypassing usual tedious implicit trial-and-error iterative procedures in identifying numerous unknown parameters. Design/methodology/approach Finite strain response features of metals with realistic hardening-to-softening transition effects up to eventual failure are studied for the first time based on the self-consistent elastoplastic J(2)-flow model with the logarithmic stress rate. As contrasted with usual approximate and incomplete treatments merely considering certain particular types of hardening effects such as power type hardening, here a novel and explicit approach is proposed to obtain a complete form of the plastic-work-dependent yield strength over the whole hardening and softening range. Findings A new multi-axial evolution equation for both hardening and softening effects is established in an explicit form. Complete results for the purpose of model validation and prediction are presented for the finite strain responses of monotonic uniaxial stretching up to failure. Originality/value New finite strain elastoplastic equations are established with a new history-dependent variable equivalently in place of the usual plastic work. With these equations, a unified and accurate simulation of both gardening and softening effects up to failure is achieved for the first time in an explicit sense without involving usual tedious implicit trial-and-error iterative procedures.

关键词： Metals Finite strain Elastoplasticity Hardening Softening Unified simulation

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