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Acta Mechanica Solida Sinica 2023年第6期36卷 817-836页

作者： Xiang Ou xiaohu yao Run Zhang School of Civil Engineering and Transportation South China University of TechnologyGuangzhouGuangdongChina

This paper presents a weak form quadrature element formulation in the analysis of nonlinear bifurcation and post-buckling of cylindrical composite stiffened laminates subjected to transverse loads.A total Lagrangian updating scheme is used in combination with arc-length method,and the branch-switching method is adopted to identify the whole post-buckling procedure of the *** formulation of the shell model and beam model are based on the basic concept of *** coincidence of discrete nodes and integration points in quadrature element endows it with compactness and conciseness in the nonlinear buckling analysis of the cylindrical stiffened *** numerical examples are firstly presented to verify the effectiveness and accuracy of present *** studies on the effects of the height-to-breadth ratio,lamination schemes,positions,distribution,number of the stiffeners on the bifurcation and post-buckling behavior are performed.

关键词： Cylindrical composite stiffened laminates Weak form quadrature element formulation Nonlinear bifurcation bucking Post-buckling analysis

Two-dimensional densely ordered packings of non-convex bending and assembled rods

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Particuology 2020年第3期18卷 35-42页

作者： Lingyi Meng xiaohu yao Xiaoqing Zhang Department of Mechanics Engineering School of Civil Engineering and TransportationSouth China University of TechnologyGuangzhou 510641China State Key Laboratory for Strength and Vibration of Mechanical Structure Xi'an 710049China

The investigation of the problem of particle packing has provided basic insights into the structure,symmetry,and physical properties of condensed *** packings of non-spherical particles have many applications,both in research and *** report the two-dimensional dense packing patterns of bending and assembled rods,which are non-convexly deformed from simple objects and modeled as entangled *** Carlo simulations and further analytical constructions are carried out to explore possible densely packed *** typical densely packed structures of C-bending rods are found,and their packing densities are identified as being functions of the aspect ratio and central *** shapes of assembled rods,representing the combined deformations of rods,are employed in simulations with the packing structures classified into three *** dense packing density of each packing pattern is derived as a function of different shape *** contrast with the case of disordered packings,both the shape and order are verified to affect the packing density.

关键词： Dense packings Non-convex Two-dimensional Packing density

Numerical Simulation on Ceramic/Metal Armours Impacted by Deformable Projectile

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上海交通大学学报 2004年第Z2期38卷 142-146页

作者： Zhang Xiaoqing yao xiaohu Yang Guitong College of Traffic and Communications South China University of Technology China College of Traffic and Communications South China University of Technology China Institute of Applied Mechanics Taiyuan University of Technology China Institute of Applied Mechanics Taiyuan University of Technology China

Numerical simulation for the dynamic response of ceramic/metal armours impacted by deformable projectile is carried out with *** simulated penetration processes are shown. The mushrooming of the projectile is displayed. A distinct conoid shaped zone of fragmented ceramic is observed. A significant bending of the backing plate is revealed. Simulation results match fairly well with the experimental values and the theoretical analysis results. The accuracy of the numerical simulation is validated.

关键词： deformable projectile ceramic/metal armours numerical simulation

Numerical Simulation for Arc Windshields of Aircrafts Subjected to Bird Impact

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上海交通大学学报 2004年第Z2期38卷 147-151页

作者： yao xiaohu Zhao Longmao Liu Xiaoming Institute of Applied Mechanics Taiyuan University of Technology China College of Traffic and Communications South China University of Technology China Institute of Applied Mechanics Taiyuan University of Technology China Chengdu Aircraft Industry Company China

A finite element model including full-scale circular arc windshield glass and the relative parts of the military plane is established in this paper. The model is analyzed by using an explicit element code LS-DYNA3D for analyzing the nonlinear dynamic response of structures. The data in aspects of displacement, strain, stress and contact force in the process of deformation are obtained. The deformation and failure mechanism of circular arc windshield glass are discussed. The possible location at which failure may take place is given. The valuable data are provided for designing,researching and producing new windshields with high crashworthiness.

关键词： bird impact arc windshield dynamic response liquid-solid coupling

Numerical studies of penetration problems by an improved particle method

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Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2273-2283页

作者： REN HuiLan MA TianBao yao xiaohu State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Department of Engineering Mechanics School of Civil Engineering and TransportationSouth China University of TechnologyGuangzhou 510640China

A particle mapping transportation algorithm was proposed on the basis of the particle-in-cell *** particles with rectangular influence domains were employed in the transportation algorithm to reduce the numerical *** on the error analysis in the process of particle motion computation,a prediction-correction algorithm was introduced to improve the computational ***,the performance of the particle mapping transportation method was evaluated by using the rotation,the slotted disk and the shear advection tests,and the results were compared with other interface reconstruction ***,the hemispherical projectile penetration into a steel target was numerically *** results showed that the proposed method produced less numerical fluctuations and exhibited clear material interfaces,which indicated that it is accurate and effective.

关键词： numerical simulation particle-in-cell particle mapping transportation method interface tracking penetration

Combined torsional buckling of double-walled carbon nanotubes with axial load in the multi-field coupled condition

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Science China(Physics,Mechanics & Astronomy) 2011年第9期54卷 1659-1665页

作者： SUN YuGang yao xiaohu HAN Qiang Department of Engineering Mechanics School of Civil Engineering and Transportation South China University of Technology Guangzhou 510640 China

The present study has theoretically investigated the combined torsional buckling of double-walled carbon nanotubes (DWCNTs) with axial load in the multi-field coupled condition. The effects of torsion, axial load, thermal-electrical change, surrounding elastic medium and the Van der Waals forces are all taken into consideration. The governing equation of buckling for CNTs subjected to thermo-electro-mechanical loadings has been established based on an elastic shell model of continuum mechanics. Reasonable simplifications are made to get the explicit expression of the critical buckling shear stress of DWCNTs, and numerical experiments are conducted for further research. It is shown that under certain electric and temperature field the critical buckling shear stress of DWCNTs only depends on the wave number of buckling modes. On the other hand, all the related impact factors have enormous influence on the critical buckling shear stress under a certain buckling mode. The critical buckling shear stress changes linearly with the axial-to-shear stress ratio, as well as the thermal and electric change. Axial compression tends to make DWCNTs unstable, while axial tension benefits the buckling stability. The critical buckling shear stress is directly proportional to the applied voltage. At room or lower temperature, the critical shear stress for infinitesimal buckling increases as the temperature change increases, while it decreases at a higher temperature. The conclusions are useful for the design of nano-structures related to the buckling stability of DWCNTs.

关键词： Carbon nanotubes buckling multi-field coupling

Technology Dependency of TID Response for a Custom Bandgap Voltage Reference in 65 nm to 28 nm Bulk CMOS Technologies

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Chinese Journal of Electronics 2023年第6期32卷 1286-1292页

作者： LIANG Bin WEN Yi CHEN Jianjun CHI Yaqing yao xiaohu College of Computer Science National University of Defense Technology

Total ionizing dose(TID) radiation response of the custom bandgap voltage reference(BGR)fabricated with 65 nm, 40 nm and 28 nm commercial bulk CMOS technologies is investigated. TID response is assessed employing Co-60 gamma ray source. The measurements indicate that the voltage reference is reduced by5.67% in 28 nm, 0.56% in 40 nm and increased by 1.28% in65 nm devices under irradiation up to 1.2 Mrad(Si) *** 48 hours of annealing, the voltage reference changes are just-1.84% in 28 nm, 0.14% in 40 nm and 1.14% in 65nm. The obtained results demonstrate that the custom BGR has naturally superior TID response due to the circuit design margins.

关键词： Voltage measurement Annealing Photonic band gap Gamma-rays Aerospace electronics CMOS technology Circuit synthesis

Reynosin protects neuronal cells from microglial neuroinflammation by suppressing NLRP3 inflammasome activation mediated by NADPH oxidase

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Chinese Journal of Natural Medicines 2024年第6期22卷 486-500页

作者： YANG Yanqiu CHE Yue FANG Mingxia yao xiaohu ZHOU Di WANG Feng CHEN Gang LIANG Dong LI Ning HOU Yue Key Laboratory of Bioresource Research and Development of Liaoning Province College of Life and Health SciencesNorth-eastern UniversityShenyang 110000China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Key Laboratory of Data Analytics and Optimization for Smart IndustryMinistry of EducationNortheastern UniversityShenyang 110000China School of Traditional Chinese Materia Medica Key Laboratory of Innovative Traditional Chinese Medicine for Major Chronic Diseases of Liaoning provinceKey Laboratory for TCM Material Basis Study and Innovative Drug Development of Shenyang CityShenyang Pharmaceutical UniversityShenyang 110000China State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541000China

Neuroinflammation,mediated by the nucleotide-binding oligomerization domain-like receptor family pyrin domain-containing-3(NLRP3)inflammasome,is a significant contributor to the pathogenesis of neurodegenerative diseases(NDDs).Reynos-in,a natural sesquiterpene lactone(SL),exhibits a broad spectrum of pharmacological effects,suggesting its potential therapeutic ***,the effects and mechanism of reynosin on neuroinflammation remain *** current study explores the effects and mechanisms of reynosin on neuroinflammation using mice and BV-2 microglial cells treated with lipopolysaccharide(LPS).Our findings reveal that reynosin effectively reduces microglial inflammation in vitro,as demonstrated by decreased CD11b expression and lowered interleukin-1 beta(IL-1β)and interleukin-18(IL-18)mRNA and protein ***,in vivo,results showed a re-duction in the number of Iba-1 positive cells and alleviation of morphological alterations,alongside decreased expressions of IL-1βand *** analysis indicates that reynosin inhibits NLRP3 inflammasome activation,evidenced by reduced transcription of NLRP3 and caspase-1,diminished NLRP3 protein expression,inhibited apoptosis-associated speck-like protein containing a CARD(ASC)oli-gomerization,and decreased caspase-1 ***,reynosin curtailed the activation of nicotinamide adenine dinuc-leotide phosphate(NADPH)oxidase,demonstrated by reduced NADP^(+)and NADPH levels,downregulation of gp91^(phox) mRNA,pro-tein expression,suppression of p47^(phox) expression and translocation to the ***,reynosin exhibited a neuroprotective effect against microglial inflammation in vivo and in *** collective findings underscore reynosin’s capacity to mitigate mi-croglial inflammation by inhibiting the NLRP3 inflammasome,thus highlighting its potential as a therapeutic agent for managing neuroinflammation.

关键词： Microglia NLRP3 inflammasome Reactive oxygen species NADPH oxidase Neuron Reynosin

Wetting phenomenon in cavitations of electronic packaging materials

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Wetting phenomenon in cavitations of electronic packaging ma...

汽车夹层风窗玻璃抗冲击破坏机理与吸能特性的研究

23rd International Congress of Theoretical and Applied Mechanics

作者： Yue Mei xiaohu yao School of civil engineering and transportation South China University of Technology

＜正＞Material,especially polymers,in electronic packaging may become failure when they subject the combined effect of liquid and vapor after moisture *** this paper,we firstly discuss "wetting" mechanism of porous ma...

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汽车工程 2016年第1期38卷 102-108页

作者：钟渝楷姚小虎臧曙光华南理工大学土木与交通学院广州510640 中国建筑材料科学研究院北京100024

本文建立了汽车风窗玻璃有限元模型,利用非线性动力学有限元软件LS-DYNA求解得到了风窗玻璃典型位置的加速度时程曲线和裂纹扩展模式,并与文献中的实验结果进行了对比,验证了模型的正确性;然后,基于该模型,研究风窗玻璃厚度对最大接触... 详细信息

本文建立了汽车风窗玻璃有限元模型,利用非线性动力学有限元软件LS-DYNA求解得到了风窗玻璃典型位置的加速度时程曲线和裂纹扩展模式,并与文献中的实验结果进行了对比,验证了模型的正确性;然后,基于该模型,研究风窗玻璃厚度对最大接触力、冲击块最大位移、头部损伤指标和吸能比率等吸能指标的影响规律。结果表明,汽车风窗玻璃遭受低速冲击时,在风窗玻璃总厚度不变的情况下,适当增加玻璃厚度、减小PVB厚度能起到更好保护乘员安全的效果。

关键词：汽车风窗玻璃抗冲击破坏机理吸能特性数值模拟