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Rate-, state-, and pressure-dependent friction model based on the elastoplastic theory

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friction 2020年第4期8卷 768-783页

作者： Shingo OZAKI Takeru MATSUURA Satoru MAEGAWA Division of System Research Yokohama National UniversityTokiwadai 79-5Hodogaya-kuYokohama 240-8501Japan Department of Electrical and Mechanical Engineering Nagoya Institute of TechnologyGokiso-choShowa-kuNagoya 466-8555Japan

Adhesion is one of essences with respect to rubber friction because the magnitude of the friction force is closely related to the magnitude of adhesion on a real contact area. However, the real contact area during sliding depends on the state and history of the contact surface. Therefore, the friction force occasionally exhibits rate-, state-, and pressure dependency. In this study, to rationally describe friction and simulate boundary value problems, a rate-, state-, and pressure-dependent friction model based on the elastoplastic theory was formulated. First, the evolution law for the friction coefficient was prescribed. Next, a nonlinear sliding surface (frictional criterion) was adopted, and several other evolution laws for internal state variables were prescribed. Subsequently, the typical response characteristics of the proposed friction model were demonstrated, and its validity was verified by comparing the obtained results with those of experiments conducted considering the contact surface between a rough rubber hemisphere and smooth acrylic plate.

关键词： adhesion friction model elastoplastic theory contact surface stick-slip

A first order friction model for lubricated sheet metal forming

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Theoretical & Applied Mechanics Letters 2018年第1期8卷 57-61页

作者： Hans B.Lofgren School of Business Engineering and ScienceHalmstad UniversityP.O.Box 823SE-301 18 HalmstadSweden

This paper presents the derivation of a first order friction model for lubricated sheet metal *** purely plastic real contacts, Newton's law of viscosity, and a square root behavior of the hydrodynamic coefficient of friction with respect to the hydrodynamic Hersey parameter an analytic model is found. The model predicts the coefficient of friction as a function of the relative pressure, the relative Hersey parameter and the real contact coefficient of friction. Questions about local and global friction are raised in the validation of the model against flat tool sheet experiments. For some flat tool sheet experiments reasonable agreements are obtained assuming a rigid punch pressure distribution. The restricted number of user inputs makes the model useful in early tool design simulations.

关键词： friction model Lubrication Sheet metal forming

Mechanism analysis and improved model for stick-slip friction behavior considering stress distribution variation of interface

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Chinese Physics B 2022年第3期31卷 350-363页

作者： Jingyu Han Jiahao Ding Hongyu Wu Shaoze Yan State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Studying the evolution of interface contact state, revealing the “black box” behavior in interface friction and establishing a more accurate friction model are of great significance to improve the prediction accuracy of mechanical system performance. Based on the principle of total reflection, a visual analysis technology of interface contact behavior is proposed. Considering the dynamic variation of stress distribution in interface contact, we analyze the nonlinear characteristics of contact parameters in different stages of stick-slip process using the above-mentioned experimental technology. Then,we find that the tangential stiffness of the interface is not a fixed value during the stick-slip process and the stress distribution variation is one of the important factors affecting the tangential stiffness of interface. Based on the previous experimental results, we present an improved stick-slip friction model, considering the change of tangential stiffness and friction coefficient caused by the stress distribution variation. This improved model can characterize the variation characteristics of contact parameters in different stages of stick-slip process, whose simulation results are in good agreement with the experimental data. This research may be valuable for improving the prediction accuracy of mechanical system performance.

关键词： stress distribution tangential stiffness friction coefficient stick-slip friction model

Advances in friction of aluminium alloy deep drawing

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friction 2024年第3期12卷 396-427页

作者： Yiren GAO Hongxia LI Danyang ZHAO Minjie WANG Xiaobo FAN School of Mechanical Engineering Dalian University of TechnologyDalian 116023China

Broad use of lightweight aluminium alloy parts in automobile manufacturing,aerospace,electronic communication,and rail transit is mainly formed through deep drawing *** drawing friction is a key boundary condition for controlling the forming quality of aluminium alloy ***,due to the oxidation and adhesion tendency of aluminium alloys,the tribological situations of aluminium alloy deep drawing(AADD)system is more complicated than those of traditional deep drawing of steel ***,the study of AADD friction is essential for manufacturing high-performance aluminium alloy ***,aiming to provide a valuable reference for researchers in related fields,a comprehensive review of AADD friction is provided,including friction mechanism,influencing factors,friction measurement,friction model,friction simulation,and lubrication-free friction ***,a brief conclusion and several current challenges were discussed.

关键词： aluminium alloy deep drawing(AADD) influencing factors friction measurement friction model friction control

RESEARCH ON THE SELECTION OF friction modelS IN THE FINITE ELEMENT SIMULATION OF WARM EXTRUSION

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维普期刊数据库

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Acta Metallurgica Sinica(English Letters) 2003年第2期16卷 90-96页

作者： X.B.Lin H.S.Xiao Z.L.Zhang National Die and Mold CAD Engineering Research Center Shanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030ChinaNational Die and Mold CAD Engineering Research CenterShanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030ChinaNational Die and Mold CAD Engineering Research CenterShanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030China

During the process of finite element simulation of precision warm forging, the selection of friction models has a direct effect on the precision accuracy of finite element simulation results. Among all the factors which influence the selection of friction models, the distribution rule of normal stress at the tool-workpiece interface is a key one. To find out the distribution rule of normal stress at the tool-workpiece interface, this paper has made a systematic research on three typical plastic deformation processes: forward extrusion, backward extrusion, and lateral extrusion by a method of finite element simulation. Then on the base of synthesizing and correcting traditional friction models, a new general friction model which is fit for warm extrusion is developed at last.

关键词： friction model warm extrusion finite element simulation

An improved LuGre model for calculating static steering torque of rubber tracked chassis

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Defence Technology（防务技术） 2022年第5期18卷 797-810页

作者： Kang Liang Qun-zhang Tu Xin-min Shen Zhong-hang Fang Xuan Yang Yong Zhang Hui-yu Xiang College of Field Engineering Army Engineering University of PLANanjing210007China State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery Xuzhou Construction Machinery GroupXuzhou221004China

Tire and rubber track interchangeable chassis combines the advantages of tire and rubber track,which can greatly improve the maneuverability of military construction ***,there is almost no effective calculation model for the real-time static steering *** the relative sliding speed is greater than 0.01 m/s,the influence of friction heating can not be *** improved LuGre model is established to calculate the static real-time steering torque of tire and rubber track interchangeable ***,the friction heating model between rubber and ground is *** with the influence of temperature on the dynamic performance of rubber material,the influence of friction heating on the stiffness and friction coefficient of rubber track is analyzed,and the improved LuGre friction model is *** steering torque of tire and rubber track interchangeable chassis is affected by rubber material properties,steering speed,pavement type,and ambient *** with the original Lu Gre model,the improved LuGre model captures the change in friction torque during multiple in-situ turns due to frictional *** error with the experimental data is small,which verifies the effectiveness of the improved LuGre model.

关键词： Rubber track Static steering torque friction model Chassis Maneuverability Vehicle

Evaluation of tool wear and cutting performance based on FEM simulation

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Chinese Journal of Aeronautics 2021年第4期34卷 140-152页

作者： Zhenyu SHI Xin LI Ningmin DUAN Qibiao YANG Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of EducationShandong UniversityJinan 250061China School of Mechanical Engineering Shandong UniversityJinan 250061China School of Mechanical Engineering Hubei University of TechnologyWuhan 430000China

An accurate estimation of tool wear morphology can provide the opportunity to investigate the influence of tool wear on cutting performance as well as reduce the overall production ***,tool wear prediction is still a very challenging research *** this paper,a novel method for simulating the actual chip formation and wear evolution thorough the 3 D finite element model has been carried *** order to improve the accuracy of simulation results,the influence of worn tool,stress and temperature distribution on wear rate are *** cutting experiment has been conducted by turning AISI1045 with uncoated carbide tools to validate the accuracy of the proposed *** comparison between experimental and simulation results show good agreement which proves the ability of the proposed model in forecasting the tool *** validated finite element model has been further utilized studying how the worn tool affects the cutting performance including actual cutting rake,stress distribution,cutting force and *** results of this paper not only provide a clear understanding of wear evolution between tool rake face and chip,but also are meaningful to optimize tool design and cutting parameters.

关键词： Finite element method friction model Machining Stress distribution Wear

DYNAMIC RESPONSES OF PIEZOELECTRIC INERTIA DRIVE MOTORS WITH DIFFERENT friction modelS

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DYNAMIC RESPONSES OF PIEZOELECTRIC INERTIA DRIVE MOTORS WITH...

Advance and trend of friction study in plastic forming

2016年全国压电和声波理论及器件应用研讨会

作者： Ya-hui ZHAO Li-ling HAN Rui ZHANG Cheng-liang PAN Lian-dong YU School of Instrument Science and Opto-electronics Engineering Hefei University of Technology

Background, Motivation and Objective With the rapid development of micro/nano technologies, precision positioning is becoming increasingly important in many scientific devices. The generic requirement with these devices is the realization of an accurate long-range motion for the mechanical systems. Piezoelectric actuators are widely used in miniature devices to realize an extremely accurate motion because of their small size, high resolution, large force, and rapid response. However, piezoelectric elements themselves have an inherent defect of limited motion stroke, typically below millimeters. Piezoelectric motors effectively alleviate the contradiction between large stroke and high precision, which keep the nanometer level displacement resolution and extend the stroke to be theoretically infinite. Among them, piezoelectric inertia drive motors(PIDMs) are preferred to be used for cross-scale micro precision positioning system, which has outstanding advantages of simple structure, easy control, and high resolution. Although PIDMs have been investigated for many years, their real dynamic responses are still not totally clear. The objective of this paper is to investigate the typical kinematics models of PIDMs and the influence of friction models on dynamic responses of PIDMs. Statement of Contribution/Methods In this paper, dynamic responses of the PIDMs are studied theoretically and numerically. Working principles and kinematics models of two typical kinds of PIDMs are introduced. Motion characteristics of the PIDMs are analyzed numerically by simulation software MATLAB/Simulink. Dynamic responses of the PIDMs with different friction models are compared and discussed. Results In the numerical simulation, two different simplified friction models for the kinematics models of PIDMs are selected. Motion curves of the stator and slider under different stick-slip and slip-slip working conditions are obtained. In addition to the expected inertia-friction motion, two typica

关键词： Piezoelectric motors Inertia drive Kinematics model friction model Dynamic response

来源： cnki会议评论

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Transactions of Nonferrous Metals Society of China 2014年第5期24卷 1263-1272页

作者：王丹杨合李恒西北工业大学材料学院凝固技术国家重点实验室西安710072

friction is a critical issue in plastic forming which influences forming force, metal flow, forming quality and service life of die. Since friction is a highly nonlinear physical phenomenon which is interactively affected by so many factors, great efforts have been made to study the friction mechanism and controlling. The research progress of friction issues in plastic forming was summarized and discussed from four aspects： testing, characterizing, modeling and optimization/controlling. Considering urgent demands for green, efficient and precise forming of high-performance, lightweight and complex components in high-tech industries such as aerospace and automotive, the trends and challenges of friction study in plastic forming were proposed.

关键词： plastic forming friction model lubricant friction coefficient