检索结果-南通市图书馆

Dynamic Response of a Coated Half-Plane with Hysteretic Damping Under a Harmonic Hertz Load

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2020年第4期33卷 449-463页

作者： Xiaomin Wang liaoliang ke Yuesheng Wang Institute of Engineering Mechanics Beijing Jiaotong UniversityBeijing 100044China School of Mechanical Engineering Tianjin UniversityTianjin 300350China

This paper investigates the dynamic response of a coated half-plane subjected to a harmonic Hertz load on the coating *** complex modulus is used to describe the hysteretic damping of the elastic homogeneous coating and *** the Helmholtz decomposition and Fourier integral transform technique,we derive the stresses and displacements of the coating and half-plane from Navier5s elasticdynamic equations in the form of complex ***,the global adaptive quadrature algorithm is exploited to solve the complex integrals *** effects of Young’s modulus ratio,density ratio,coating thickness,loss factor and external excitation frequency are *** is found that the dynamic response of displacements and stresses becomes increasingly oscillatory with the increase in excitation frequency.

关键词： Dynamic response Coating Hysteretic damping Harmonic Hertz load

Contact vibration analysis of the functionally graded material coated half-space under a rigid spherical punch

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2022年第8期43卷 1187-1202页

作者： Xin LYU liaoliang ke Jiayong TIAN Jie SU School of Mechanical Engineering Tianjin UniversityTianjin300350China National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing100085China

This paper studies the contact vibration problem of an elastic half-space coated with functionally graded materials(FGMs)subject to a rigid spherical punch.A static force superimposing a dynamic time-harmonic force acts on the rigid spherical ***,we give the static contact problem of FGMs by a least-square fitting ***,the dynamic contact pressure is solved by employing the perturbation ***,the dynamic contact stiffness with different dynamic contact displacement conditions is derived for the FGM coated *** effects of the gradient index,coating thickness,internal friction,and punch radius on the dynamic contact stiffness factor are discussed in detail.

关键词： contact vibration functionally graded material(FGM) spherical punch perturbation method

The size-dependent elastohydrodynamic lubrication contact of a coated half-plane with non-Newtonian fluid

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2021年第7期42卷 915-930页

作者： Jie SU Hongxia SONG liaoliang ke S.M.AIZIKOVICH School of Mechanical Engineering Tianjin UniversityTianjin 300350China School of Mathematical Science Inner Mongolia UniversityHohhot 010021China Laboratory of Functionally Graded and Composite Materials Research and Education Center"Materials"Don State Technical UniversityRostov-on-Don 344000Russia

Based on the couple-stress theory,the elastohydrodynamic lubrication(EHL)contact is analyzed with a consideration of the size *** lubricant between the contact surface of a homogeneous coated half-plane and a rigid punch is supposed to be the non-Newtonian *** density and viscosity of the lubricant are dependent on fluid *** of film thickness,in-plane stress,and fluid pressure are calculated by solving the nonlinear fluid-solid coupled equations with an iterative *** effects of the punch radius,size parameter,coating thickness,slide/roll ratio,entraining velocity,resultant normal load,and stiffness ratio on lubricant film thickness,in-plane stress,and fluid pressure are *** results demonstrate that fluid pressure and film thickness are obviously dependent on the size parameter,stiffness ratio,and coating thickness.

关键词： elastohydrodynamic lubrication(EHL) non-Newtonian fluid size effect couple-stress theory coating

在线全文

学校读者我要写书评

暂无评论

计及磨损的电连接器插拔力分析

固体力学学报 2024年第1期45卷 52-60页

作者：李友华沈飞王志慧刘奕光邢前柯燎亮天津大学机械工程学院天津300350 中国航天标准化与产品保证研究院北京100071

电连接器在工程中使用量大,接触失效情况严重,一旦发生失效则有可能影响设备的正常使用甚至毁坏设备.针对电连接器接触失效占比率较高,且磨损对插拔力的影响规律未知等问题,本文以国产某型号电连接器为研究对象,建立电连接器的等效有限... 详细信息

电连接器在工程中使用量大,接触失效情况严重,一旦发生失效则有可能影响设备的正常使用甚至毁坏设备.针对电连接器接触失效占比率较高,且磨损对插拔力的影响规律未知等问题,本文以国产某型号电连接器为研究对象,建立电连接器的等效有限元模型,使用自适应网格技术和耗散能磨损模型进行磨损模拟,获得不同插拔次数下接触表面的磨损形貌,讨论不同插拔次数下磨损程度对电连接器插拔力的影响.结果表明,随着插拔次数的增加,电连接器表面的磨损会逐渐严重,插拔力的波动现象也会更加明显,且磨损对电连接器的拔出力影响较插入力更明显.

关键词：电连接器磨损分析插拔力有限元模型自适应网格

Thermoelastic rotating contact of an FGM coating with temperature-dependent and arbitrary varying properties

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第4期66卷 1038-1049页

作者： ZHOU JiaLin SHEN Fei LIU Jing EL-BORGI Sami ke liaoliang Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin 300350China College of Engineering Huazhong Agricultural UniversityWuhan 430070Chin Mechanical Engineering Program Engineering BuildingTexas A&M University at QatarP.O.Box 23874Qatar

This paper investigates the frictional thermoelastic contact of a rigid spherical punch and functionally graded material(FGM)coated half-space with arbitrarily varying material *** material parameters include the elastic modulus,Poisson’s ratio,heat conduction parameter,and thermal expansion *** material parameters of the FGM coating and half-space are assumed to be temperature *** spherical punch is rotated in the FGM-coated half-space at a constant angular *** generated frictional heat is related to the friction coefficient,contact radius,angular velocity,and contact pressure.A theoretical formula for the thermoelastic rotating contact problem is established and solved using the finite element *** main objective of this paper is to investigate the effects of temperature dependence,gradient index,friction coefficient,angular velocity,and gradient form on the surface temperature and stresses.

关键词： rotating punch frictional heat functionally graded materials temperature dependence arbitrary properties

Nonlinear vibration of edged cracked FGM beams using differential quadrature method

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第11期55卷 2114-2121页

作者： ke liaoliang WANG YueSheng YANG Jie KITIPORNCHAI Sritawat ALAM Firoz Institute of Engineering Mechanics Beijing Jiaotong UniversityBeijing 100044China School of Aerospace Mechanical and Manufacturing EngineeringRMIT UniversityPO Box 71BundooraVictoria 3083Australia Department of Building and Construction City University of Hong KongKowloonHong KongChina

This paper investigated the nonlinear vibration of functionally graded beams containing an open edge crack based on Timoshenko beam *** cracked section is modeled by a massless elastic rotational *** is assumed that material properties follow exponential distributions through the beam *** differential quadrature(DQ) method is employed to discretize the nonlinear governing equations which are then solved by a direct iterative method to obtain the nonlinear vibration frequencies of beams with different boundary *** effects of the material gradient,crack depth and boundary conditions on nonlinear free vibration characteristics of the cracked FGM beams are studied in detail.

关键词： functionally graded materials (FGMs) Timoshenko beam edge crack nonlinear vibration DQ method

在线全文

学校读者我要写书评

暂无评论

功能梯度形状记忆合金纳米梁力学性能研究

机械强度 2024年第1期46卷 152-160页

作者：贾晓丽李守宝刘璐黄书童郑磊柯燎亮中国石油大学(北京)机械与储运工程学院北京102249 天津大学机械工程学院天津300072

功能梯度形状记忆合金(Functionally Graded Shape Memory Alloys,FG⁃SMA)兼具功能梯度材料和形状记忆合金的双重特性,故在航空航天、生物医疗、微机电系统(Micro Electro Mechanical System,MEMS)中得到了广泛的应用。当微结构尺度达... 详细信息

功能梯度形状记忆合金(Functionally Graded Shape Memory Alloys,FG⁃SMA)兼具功能梯度材料和形状记忆合金的双重特性,故在航空航天、生物医疗、微机电系统(Micro Electro Mechanical System,MEMS)中得到了广泛的应用。当微结构尺度达到纳米尺度,表面效应对微结构力学性能的影响是十分显著的。为了探究表面效应对功能梯度形状记忆合金纳米梁力学性能的影响规律,基于梁弯曲理论及Gurtin⁃Murdoch表面弹性理论,考虑拉压不对称、温度对FG⁃SMA纳米梁的影响,建立了考虑表面效应的FG⁃SMA纳米梁相变力学模型。分析了梯度指数、载荷、温度及拉压不对称系数对FG⁃SMA纳米梁力学性能的影响规律。研究表明,弯矩、梯度指数对截面响应影响显著,而温度和拉压不对称系数对其影响较小;忽略表面效应的影响会低估FG⁃SMA纳米梁的抗弯性;在弯矩达到一定程度后,表面效应对FG⁃SMA纳米梁中性轴偏移趋势影响不大。研究结果对FG⁃SMA纳米梁在微机电领域的设计及应用提供了一定的基础与依据。

关键词：功能梯度形状记忆合金微机电系统表面效应 Gurtin⁃Murdoch 表面弹性理论相变

维普期刊数据库博看期刊

功能梯度材料接触力学若干基本问题的研究进展

在线全文

学校读者我要写书评

暂无评论

科学通报 2015年第17期60卷 1565-1573页

作者：柯燎亮汪越胜北京交通大学力学系北京100044

由于功能梯度材料在改善表面接触损伤方面的潜在应用,其接触力学问题受到越来越广泛关注,许多学者开展了大量的研究工作.本文结合作者近些年来在功能梯度材料接触力学方面开展的研究工作,综述了功能梯度材料接触力学若干基本问题的最新... 详细信息

由于功能梯度材料在改善表面接触损伤方面的潜在应用,其接触力学问题受到越来越广泛关注,许多学者开展了大量的研究工作.本文结合作者近些年来在功能梯度材料接触力学方面开展的研究工作,综述了功能梯度材料接触力学若干基本问题的最新理论研究进展,包括功能梯度材料的无摩擦和滑动摩擦接触、微动接触、热弹性接触及失稳、力电磁多场耦合接触和黏附接触.最后对未来功能梯度材料接触力学研究进行了展望.

关键词：功能梯度材料接触力学接触损伤微动接触热弹性接触失稳黏附接触

基于偶应力理论涂层半平面的二维滑动摩擦接触分析

在线全文

学校读者我要写书评

暂无评论

中国科学：技术科学 2019年第10期49卷 1197-1207页

作者：宋红霞柯燎亮汪越胜北京交通大学土木建筑工程学院力学系北京100044 天津大学机械工程学院力学系天津300350

本文基于偶应力理论,研究了平面应变状态下刚性压头与均匀涂层半平面之间的二维滑动摩擦接触问题.该理论通过引入材料特征长度来描述微结构材料的尺寸效应.采用傅里叶积分变换方法将此尺寸依赖的接触问题转化为第二类Cauchy奇异积分方程... 详细信息

本文基于偶应力理论,研究了平面应变状态下刚性压头与均匀涂层半平面之间的二维滑动摩擦接触问题.该理论通过引入材料特征长度来描述微结构材料的尺寸效应.采用傅里叶积分变换方法将此尺寸依赖的接触问题转化为第二类Cauchy奇异积分方程.然后,通过数值求解该类方程来确定涂层表面法向应力和面内应力的分布.详细讨论了尺度参数、剪切模量比和摩擦系数对表面法向接触应力和面内应力的影响.结果表明基于偶应力理论得到的接触应力明显偏离基于经典弹性理论预测的结果,而且表现出对材料特征长度的强烈依赖性.

关键词：接触力学偶应力理论摩擦尺寸效应涂层