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A new 3D plastoelastohydrodynamic lubrication model for rough surfaces

Friction 2024年第6期12卷 1176-1193页

作者： Shengyu YOU jinyuan tang Qiang WANG State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China

Plastoelastohydrodynamic lubrication of rough surfaces(R-PEHL)is a cutting-edge area of research in interface fluid-structure coupling *** existing R-PEHL model calculates the elastic-plastic deformation of rough surface by the Love equation in a semi-infinite space smooth surface,which deviates from the actual ***,it is an innovative work to study the exact solution of elastic-plastic deformation of rough surface and its influence on the solution results of R-PEHL *** this paper,a new contact calculation model of plastoelastohydrodynamic lubrication(PEHL)with three-dimensional(3D)rough surface is proposed by integrating numerical method of EHL and finite element *** new model eliminates an original error introduced by the assumption of semi-infinite space in contact calculation,providing wide applicability and high *** the given rough surfaces and working conditions,the study reveals that:(1)the oil film pressure calculated by the new model is lower than that of the smooth surface in semi-infinite space by 200–800 MPa;(2)the Mises stress of the new model is 2.5%–26.6%higher than that of the smooth surface in semi-infinite space;(3)compared with the semi-infinite space assumption,the rough surface plastic deformation of the new model is increased by 71%–173%,and the local plastic deformation singularity may appear under the semi-infinite space assumption;(4)the plastic deformation caused by the first contact cycle on the rough surface of the new model accounts for 66.7%–92.9%of the total plastic deformation,and the plastic deformation of the semi-infinite space accounts for 50%–83.3%.This study resolves the contradiction between the smooth surface assumption and the rough surface in the existing R-PEHL model,establishing a solid logic foundation for the accurate solution of R-PEHL model.

关键词： rough surface plastoelastohydrodynamic lubrication(PEHL) asperity plastic deformation semi-infinite space

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Prediction and Minimization of the Heat Treatment Induced Distortion in 8620H Steel Gear:Simulation and Experimental Verification

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Chinese Journal of Mechanical Engineering 2022年第6期35卷 207-218页

作者： Wen Shao Mohan Yi jinyuan tang Siyuan Sun State Key Laboratory of High Performance Complex Manufacturing College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China

The considerable heat treatment induced runout value in the end face of the automobile main reducer gear is always dimensionally out of *** directly affects the dimensional accuracy,the grade of carburized and hardened gears,and the post-quenching manufacturing *** this study,three dimensional numerical models were developed to simulate the carburizing-quenching process of gear based on the multi-field coupling theory using DEFORM *** results indicated that the ununiform cooling rate of the gear caused by the asymmetry of the web structure would result in the ununiform distribution of martensite,leading to the large runout value at the end face of the ***,a novel method was proposed to minimize the heat treatment induced runout *** was found that the heat treatment induced runout value could be effectively controlled by the addition of a compensation ring and the support of a rod *** experiments showed that the average runout value of the gear end face before and after the proposed heat treatment method were about 0.023 mm and 0.059 mm respectively,which was in good agreement with the simulated *** novel approach proposed in this study led to a reduction of the gear runout value by 70.0%‒76.9%compared to that of the original heat treatment process,which may serve as a practical and economical way to predict and minimize the heat treatment induced distortion in drive gear.

关键词： Distortion Carburizing-quenching Numerical simulation Heat treatment 8620H steel gear

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A Comparative Study on Asperity Peak Modeling Methods

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Chinese Journal of Mechanical Engineering 2021年第4期34卷 137-150页

作者： Wei Zhou Daiyan Zhao jinyuan tang Jun Yi Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material Hunan University of Science and TechnologyXiangtan 411201China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

The peak identification scheme based method(three-point definition)and the spectral moments based method(spectral moment approach)are both widely used for asperity peak modeling in *** discover the differences between the two methods,a great number of rough surface profile samples with various statistical distributions are first randomly generated using *** the distribution parameters of asperity peaks are calculated for the generated samples with both *** obtained results are compared and verified by *** variation rules of the differences between the two methods with statistical characteristics of rough surfaces are *** explain for the discovered differences,the assumptions by spectral moment approach that the joint distribution of surface height,slope and curvature is normal and that the height distribution of asperities is Gaussian,are *** results show that it is unreasonable to assume a joint normal distribution without inspecting the correlation pattern of[z],[z′]and[z′′],and that the height distribution of asperities is not exactly Gaussian before correlation length of rough surface increases to a certain extent,20 for instance.

关键词： Surface topography Roughness Surface analysis Asperity peak Random process model

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New analytical model of elastic-plastic contact for three-dimensional rough surfaces considering interaction of asperities

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Friction 2022年第2期10卷 217-231页

作者： Yuqin WEN jinyuan tang Wei ZHOU Lin LI Caichao ZHU State Key L aboratory of High Performance Complex Manufacturing Central South University.Changsha 410083.China Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material Hunan University of Science and TechnologyXiangtan 411201China State Key Laboratory of Mechanical Transmission Chongqing UniversityXiangtan 400044China

The contact calculation of three-dimensional real rough surfaces is the frontier field of tribology and surface *** this study,we consider the interaction and elastic-plastic deformation characteristics of asperities and further,propose an analytical contact calculation method for rough surfaces considering the interaction of *** on the watershed algorithm,the rough surface is segmented and the asperities are reconstructed into *** to the height relationship between the asperities,the definition of the deformation reference height of the matrix between each couple of asperities is ***,the calculation formula of the substrate deformation is provided according to the local contact pressure considering the elastic-plastic deformation of the asperity,and the contact state under a specific load is determined using the iterative correction *** results correspond with those of finite element numerical calculation and the study reveals the following:(1)compared with the results obtained without considering the asperity interaction,contact area,distance,and stiffness will be reduced by 6.6%,19.6%,and 49.5%,respectively,when the influence of asperity interaction is considered;(2)the interaction of the asperities has the greatest influence on the surface contact distance and *** the same load,the existence of asperity interaction will reduce the contact distance,area,and stiffness;(3)considering the interaction of the asperities,the higher asperity will bear more load,but it will simultaneously reduce the contact of the surrounding area and increase that of the distant *** calculation method proposed in this study has the advantages of high calculation efficiency and accuracy,thus,providing the calculation basis and method for subsequent studies on service performance of rough surfaces,such as the calculation of contact stiffness and fatigue performance analysis of rough surfaces.

关键词： calculation method contact analysis interaction of asperities rough surface

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Evaluation of contact fatigue risk of a carburized gear considering gradients of mechanical properties

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Friction 2020年第6期8卷 1039-1050页

作者： Wei WANG Huaiju LIU Caichao ZHU jinyuan tang Chenxu JIANG State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400030China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China College of Aerospace Engineering Chongqing UniversityChongqing 400044China

Carburized gears are widely used in geared machines such as wind *** fatigue problems occur in engineering practice,reducing reliabilities of *** fatigue failures are related to many factors,such as gradients of mechanical properties of the hardening *** this work,an elastic-plastic contact model of a carburized gear is developed based on the finite element method to evaluate contact fatigue failure risk,considering variations in hardness and *** Dang Van multiaxial equivalent stress is calculated via Python coding within the Abaqus *** gradient of yield strength along the depth from case to core is *** concept of local material fatigue failure risk is defined to evaluate the probability of pitting *** effects of design factors,such as the case hardening depth(CHD),surface hardness,and contact pressure on fatigue failure risk,are *** the CHD increases or the surface hardness decreases,the risk of deep spalling failure *** increase in surface hardness leads to a decreased risk of pitting failure,while the variation in CHD hardly affects the pitting failure risk.

关键词： carburized gear multiaxial stress hardness gradient pitting spalling

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Tribological behavior of coated spur gear pairs with tooth surface roughness

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Friction 2019年第2期7卷 117-128页

作者： Huaiju LIU Heli LIU Caichao ZHU Peitang WEI jinyuan tang State Key Laboratory of Mechanical Transmissions Chongqing University State Key Laboratory of High Performance Complex Manufacturing Central South University

Coating is an effective way to reduce friction and wear and to improve the contact-fatigue lives of gear components, which further guarantees a longer service life and better reliability of industrial machinery. The fact that the influence coefficient linking the tractions and stress components could not be expressed explicitly increases the difficulty of coated solids contact analysis. The complicated tribological behavior between tooth surfaces influenced by lubrication and surface roughness further adds difficulty to the coated gear pair contact problems. A numerical elastohydrodynamic lubricated(EHL) contact model of a coated gear pair is proposed by considering the coupled effects of gear kinematics, coating properties, lubrication, and surface roughness. The frequency response function and the discrete convolute, fast Fourier transformation(DC-FFT) method are combined to calculate the surface deformation and the subsurface stress fields at each meshing position along the line of action(LOA). The Ree-Eyring fluid is assumed to incorporate the non-Newtonian effect, which is represented in the generalized Reynolds equation. Influences of the ratio between the Young's modulus of the coating and the substrate on the contact performance, such as pressure, film thickness, tooth friction coefficient, and subsurface stress field, are studied. The effect of the root mean square(RMS) value of the tooth surface roughness is studied by introducing the roughness data, deterministically measured by an optical profiler.

关键词： coating gear elastohydrodynamic lubrication (EHL) surface roughness

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High-precision simulation and experimental verification of residual stress and surface topography of cylindrical surface shot peening

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Chinese Journal of Aeronautics 2024年第9期37卷 535-559页

作者： Jiuyue ZHAO jinyuan tang Huaming LIU Huiyun ZHANG Xin LI Han DING State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China

Shot peening is commonly employed for surface deformation strengthening of cylindrical surface ***,it is critical to understand the effects of shot peening on residual stress and surface *** to flat surface,cylindrical surface shot peening has two significant features:(i)the curvature of the cylindrical surface and the scattering of the shot stream cause dis-tributed impact velocities;(i)the rotation of the part results in a periodic variation of the impact velocity ***,it is a challenge to quickly and accurately predict the shot peening residual stress and surface topography of cylindrical *** paper developed a high-precision model which considers the more realistic shot peening ***,a kinematic analysis model was developed to simulate the relative movement of numerous shots and cylindrical ***,the spatial distribution and time-varying impact information was ***,the impact information was used for finite element modeling to predict residual stress and surface *** proposed kinematic analysis method was validated by comparison with the dis-crete element ***,9310 high strength steel rollers shot peening test verified the effectiveness of the model in predicting the residual stress and surface *** addition,the effects of air pressure and attack angle on the residual stress and surface topography were *** work could provide a functional package for efficient prediction of the surface integrity and guide industrial application in cylindrical surface shot peening.

关键词： Shot peening Cylindrical surface 9310 high strength steel High-precision modeling Residual stress Surface topography

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20CrMnTi材料成分波动对齿轮渗碳淬火性能的影响

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中南大学学报（自然科学版） 2017年第8期48卷 1979-1987页

作者：张星唐进元中南大学机电工程学院湖南长沙410083 中南大学高性能复杂制造国家重点实验室湖南长沙410083

通过有限元方法,探讨材料成分波动对齿轮渗碳淬火工艺性能的影响。以20CrMnTi半轴齿轮作为研究对象,利用JMATPRO软件,根据材料的化学元素波动的最大值与最小值分别建立2组材料性能数据库;基于DEFORM-HT软件,建立适用于渗碳淬火工艺的仿... 详细信息

通过有限元方法,探讨材料成分波动对齿轮渗碳淬火工艺性能的影响。以20CrMnTi半轴齿轮作为研究对象,利用JMATPRO软件,根据材料的化学元素波动的最大值与最小值分别建立2组材料性能数据库;基于DEFORM-HT软件,建立适用于渗碳淬火工艺的仿真数学模型,并对这2组材料性能数据库下的半轴齿轮分别进行渗碳淬火工艺仿真,对比分析齿轮渗碳淬火仿真后的各项参数。研究结果表明:材料成分波动对齿轮渗碳层影响较小,对淬火后相组织分布和齿轮变形量有较大影响。

关键词： 20CrMnTi 半轴齿轮渗碳淬火仿真 DEFORM-HT软件 JMATPRO软件

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Variability and reduction of atmospheric pollutants in Beijing and its surrounding area during the Beijing 2008 Olympic Games

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Chinese Science Bulletin 2010年第18期55卷 1937-1944页

作者： XIN jinyuan WANG YueSi tang GuiQian WANG LiLi SUN Yang WANG YingHong HU Bo SONG Tao JI DongSheng WANG WeiFeng LI Liang LIU GuangRen State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy ofSciences Beijing 100029 China

The Beijing-Tianjin-Hebei Atmospheric Environment Monitoring Network was established by the Institute of Atmospheric Physics,Chinese Academy of *** goals of the network were to monitor and provide warnings of the atmospheric quality in Beijing and its surrounding area during the Beijing 2008 Olympic *** results showed that the atmospheric complex pollution exhibited high concentrations of ozone and fine particles and oxidation in summer,with a ubiquitous regional *** regional mean concentrations of SO2,PM2.5,NO2,and O3_8h max(the maximum daily 8 h mean) and Ox were 22±11,90±40,25±5,136±35 and 112±21 μg/m3 in summer,*** the Olympic Games,the mean concentration of SO2,PM2.5,NO2,O3_8h max,and Ox were 12.5±4,56±28,23±4,114±29,95±17 μg/m3 in the region,respectively,and fell by 51.0%,43.7%,13%,20.2%,and 18.9%,respectively,compared to the prophase mean before the Olympic *** concentration of atmospheric pollutants declined significantly and achieved the "Green Olympics" control goal of air *** the Olympic Games,SO2,PM2.5 and NOx increased significantly as the temporary atmospheric pollution control measures were terminated.

关键词：北京2008年奥运会大气污染物周边地区 2008年北京奥运会环境监测网络 PM2.5 平均浓度二氧化硫

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蜗杆砂轮曲面与面齿轮齿面的对应关系

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中南大学学报（自然科学版） 2017年第1期48卷 99-105页

作者：唐进元周恒中南大学机电工程学院高性能复杂制造国家重点实验室湖南长沙410083

研究蜗杆砂轮磨削面齿轮的原理与方法。利用产形插齿刀作为中间曲面,通过计算面齿轮和插齿刀、插齿刀与蜗杆砂轮的接触线,得到蜗杆砂轮和面齿轮处于不同加工位置的接触点计算方法,给出蜗杆砂轮磨削面与面齿轮齿面对应关系模型,在VERICU... 详细信息

研究蜗杆砂轮磨削面齿轮的原理与方法。利用产形插齿刀作为中间曲面,通过计算面齿轮和插齿刀、插齿刀与蜗杆砂轮的接触线,得到蜗杆砂轮和面齿轮处于不同加工位置的接触点计算方法,给出蜗杆砂轮磨削面与面齿轮齿面对应关系模型,在VERICUT仿真软件中对蜗杆砂轮磨削面齿轮的方法进行仿真验证。研究结果表明:利用蜗杆砂轮磨削面齿轮齿面的关系模型可分析加工过程中面齿轮齿面对应的蜗杆砂轮工作曲面位置,为通过修整蜗杆砂轮对面齿轮齿面制造误差进行补偿修正提供技术基础。

关键词：面齿轮蜗杆砂轮接触特性磨齿加工关系模型

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