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| 1 | SUPER-ELASTIC CONSTITUTIVE MODEL CONSIDERING PLASTICITY AND ITS FINITE ELEMENT IMPLEMENTATION显示文摘Based on the experimental results of super-elastic NiTi alloy,a three-dimensional super-elastic constitutive model including both of stress-induced martensite transformation and plasticity is constructed in a framework of general inelasticity.In the proposed model,transformation hardening,reverse transformation of stress-induced martensite,elastic mismatch between the austenite and martensite phases,and temperature-dependence of transformation stress and elastic modulus of each phase are considered.The plastic yielding of martensite occurred under high stress is addressed by a bilinear isotropic hardening rule.Drucker-Prager-typed transformation surfaces are employed to describe the asymmetric behavior of NiTi alloy in tension and compression.The prediction capability of the proposed model is verified by comparing the simulated results with the correspondent experimental ones.Based on backward Euler's integration,a new expression of consistent tangent modulus is derived.The proposed model is then implemented into a finite element package ABAQUS by user-subroutine UMAT.Finally,the validity of such implementation was verified by some numerical samples. | Qianhua Kan Guozheng Kang 1 Linmao Qian(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China) | 2010 | Acta Mechanica Solida Sinica2010，23，2： | 7 |
| 2 | Running-in process of Si-SiO_(x)/SiO_(2)pair at nanoscale-Sharp drops in friction and wear rate during initial cycles显示文摘Using an atomic force microscope,the running-in process of a single crystalline silicon wafer coated with native oxide layer(Si-SiO_(x))against a SiO_(2)microsphere was investigated under various normal loads and displacement amplitudes in ambient air.As the number of sliding cycles increased,both the friction force Ft of the Si-SiO_(x)/SiO_(2)pair and the wear rate of the silicon surface showed sharp drops during the initial 50 cycles and then leveled off in the remaining cycles.The sharp drop in Ft appeared to be induced mainly by the reduction of adhesion-related interfacial force between the Si-SiO_(x)/SiO_(2)pair.During the running-in process,the contact area of the Si-SiO_(x)/SiO_(2)pair might become hydrophobic due to removal of the hydrophilic oxide layer on the silicon surface and the surface change of the SiO_(2)tip,which caused the reduction of friction force and the wear rate of the Si-SiO_(x)/SiO_(2)pair.A phenomenological model is proposed to explain the running-in process of the Si-SiO_(x)/SiO_(2)pair in ambient air.The results may help us understand the mechanism of the running-in process of the Si-SiO_(x)/SiO_(2)pair at nanoscale and reduce wear failure in dynamic microelectromechanical systems(MEMS). | Lei CHEN Seong HKIM Xiaodong WANG Linmao QIAN | 2013 | Friction2013，1，1： | 5 |
| 3 | Detecting van der Waals forces between a single polymer repeating unit and a solid surface in high vacuum显示文摘Ubiquitous van der Waals(vdW)forces are very importa nt for nano structures.Although the vdW forces between two surfaces(or two layers)have been measured for several decades,a direct detection at the single-molecule level is still difficult.Herein,we report a novel method to solve this problem in high vacuum by means of AFM-based sin gle-molecule force spectroscopy(SMFS).Solve nt molecules and surface adsorbed water are removed thoroughly under high vacuum so that the situation is greatly simplified.A constant force plateau can be observed when a polymer chain is peeled off from a substrate in high vacuum.Accordingly,the vdW forces between one polymer repeating unit and the substrates can be obtained.The experimental results show that the vdW forces(typical range:21-54 pN)are dependent on the species of substrates and the size of polymer repeating unit,which is in good accordance with the theoretical results.It is expected that this novel method can be applied to detect other non-covalent interactions(such as hydrogen bond andπ-πstacking)at the single-molecule level in the future. | Wanhao Cai Chen Xiao Linmao Qian Shuxun Cui | 2019 | Nano Research2019，12，1： | 4 |
| 4 | The experimental rules of mica as a reference sample of AFM/FFM measurement显示文摘For the friction measurements with AFM/FFM, usually the relative values of friction signal can be obtained. In order to compare the micro-tribological properties of different samples, mica is often used as an reference sample for friction measurement. However, due to the friction force of new cleaved mica surface is unstable, it is urged to systematically investigate the tribological properties of mica to design the experimental rules of the reference sample mica for friction measurements. Experimental results show that the friction of mica varies with the cleaving time, humidity and surface state of tip. The friction measured with different tips on mica varies in the range of ±15%. For a new tip, the friction increases with the tip’s wear and then becomes stable. For new cleaved mica, the friction increases within thefirst two hours and then keeps unchanged. The friction of mica also decreases with the relative humidity because of its hydrophilicity. | QIAN Linmao LUO Jianbin WEN Shiwu XIAO Xudong | 2001 | Chinese Science Bulletin2001，46，4： | 3 |
| 5 | Friction-Induced Nanofabrication: A Review显示文摘As the bridge between basic principles and applications of nanotechnology,nanofabrication methods play significant role in supporting the development of nanoscale science and engineering,which is changing and improving the production and lifestyle of the human.Photo lithography and other alternative technologies,such as nanoimprinting,electron beam lithography,focused ion beam cutting,and scanning probe lithography,have brought great progress of semiconductor industry,IC manufacturing and micro/nanoelectromechanical system(MEMS/NEMS)devices.However,there remains a lot of challenges,relating to the resolution,cost,speed,and so on,in realizing high-quality products with further development of nanotechnology.None of the existing techniques can satisfy all the needs in nanoscience and nanotechnology at the same time,and it is essential to explore new nanofabrication methods.As a newly developed scanning probe microscope(SPM)-based lithography,friction-induced nanofabrication provides opportunities for maskless,flexible,low-damage,low-cost and environment-friendly processing on a wide variety of materials,including silicon,quartz,glass surfaces,and so on.It has been proved that this fabrication route provides with a broad application prospect in the fabrication of nanoimprint templates,microfluidic devices,and micro/nano optical structures.This paper hereby involved the principals and operations of friction-induced nanofabrication,including friction-induced selective etching,and the applications were reviewed as well for looking ahead at opportunities and challenges with nanotechnology development.The present review will not only enrich the knowledge in nanotribology,but also plays a positive role in promoting SPM-based nanofabrication. | Bingjun Yu Linmao Qian | 2021 | Chinese Journal of Mechanical Engineering2021，34，2： | 3 |
| 6 | Effect of oxide film on nanoscale mechanical removal of pure iron显示文摘In this paper, the properties of an oxide film formed on a pure iron surface after being polished with an H_2O_2-based acidic slurry were investigated using an atomic force microscope(AFM), Auger electron spectroscopy(AES), and angle-resolved X-ray photoelectron spectroscopy(AR-XPS) to partly reveal the material removal mechanism of pure iron during chemical mechanical polishing(CMP). The AFM results show that, when rubbed against a cone-shaped diamond tip in vacuum, the material removal depth of the polished pure iron first slowly increases to 0.45 nm with a relatively small slope of 0.11 nm/μN as the applied load increases from 0 to 4 μN, and then rapidly increases with a large slope of 1.98 nm/μN when the applied load further increases to 10 μN. In combination with the AES and AR-XPS results, a layered oxide film with approximately 2 nm thickness(roughly estimated from the sputtering rate) is formed on the pure iron surface. Moreover, the film can be simply divided into two layers, namely, an outer layer and an inner layer. The outer layer primarily consists of FeO OH(most likely α-FeOOH) and possibly Fe_2O_3 with a film thickness ranging from 0.36 to 0.48 nm(close to the 0.45 nm material removal depth at the 4 μN turning point), while the inner layer primarily consists of Fe_3O_4. The mechanical strength of the outer layer is much higher than that of the inner layer. Moreover, the mechanical strength of the inner layer is quite close to that of the pure iron substrate. However, when a real CMP process is applied to pure iron, pure mechanical wear by silica particles generates almost no material removal due to the extremely high mechanical strength of the oxide film. This indicates that other mechanisms, such as in-situ chemical corrosion-enhanced mechanical wear, dominate the CMP process. | Jinwei LIU Liang JIANG Changbang DENG Wenhao DU Linmao QIAN | 2018 | Friction2018，6，3： | 3 |
| 7 | Role of interfacial water in adhesion,friction,and wear--A critical review显示文摘Surficial water adsorption and interfacial water condensation as natural phenomena that can alter the contact status of the solid interface and tribological performances are crucial in all length scales,i.e.,from earthquakes to skating at the macroscale level and even to micro/nano-electromechanical systems(M/NEMS)at the microscale/nanoscale level.Interfacial water exhibits diverse structure and properties from bulk water because of its further interaction with solid surfaces.In this paper,the evolutions of the molecular configuration of the adsorbed water layer depending on solid surface chemistry(wettability)and structure,environmental conditions(i.e.,relative humidity and temperature),and experimental parameters(i.e.,sliding speed and normal load)and their impacts on tribological performances,such as adhesion,friction,and wear,are systematically reviewed.Based on these factors,interfacial water can increase or reduce adhesion and friction as well as facilitate or suppress the tribochemical wear depending on the water condensation kinetics at the interface as well as the thickness and structure of the involved interfacial water. | Lei CHEN Linmao QIAN | 2021 | Friction2021，9，1： | 3 |
| 8 | How linear molecules resist to shear:the origin of nanoscale friction显示文摘Friction force measurements between smooth surfaces across two layers of linear alkanes over five decades of speeds are presented. A maximum friction dissipation is observed at a characteristic speed. The behaviour is described by a new approach: the formation and destruction of molecular bridges between confined alkane layers. The bridges interdigitated between the layers exhibit a thermally activated resistance to shear.An analytical model involving activation barriers accounts for the overall behaviour of the forces over four decades of speed. This first simple semi-quantitative description sheds new light on the subtle mechanisms of friction at the nanoscale level and shows how the molecular length influences the tribological properties of the liquid. | Linmao QIAN G.Luengo E.Perez | 2004 | Science China(Physics,Mechanics & Astronomy)2004，47，z1： | 1 |
| 9 | Design of Self-adaptive Micro-tribology Multiple-measuring Test Rig and Experimental Studies on Nano-lubrication显示文摘 | Qian Linmao Luo Jianbin Zhang Wei | 1998 | Journal of Tsinghua University:Sci & Tech1998，38，4： | 1 |
| 10 | Erosion behavior of human tooth enamel in citric acid solution显示文摘 | Zheng Jing Xiao Feng Qian Linmao | 2009 | Tribology International2009，42，11： | 1 |
| 11 | Linear Stability Analysis of Thermocapillary Flow in Rotating Shallow PoolsHeated from Inner Wall显示文摘Thermocapillary flow of silicon melt(Pr=0.011)in shallow annular pool heated from inner wall was simulated at the dimensionless rotation ratewranging from 0 to 7000.The effect of pool rotation on the stability of the thermocapillary flow was investigated.The steady axisymmetric basic state was solved by using the spectral element method;the critical stability parameters were determined by linear stability analysis;the mechanism of the flow instability was explored by the analysis of energy balance.A stability diagram,exhibiting the variation of the critical Marangoni number versus the dimensionless rotation ratewwas presented.The results reveal that only one Hopf bifurcation point appeared in the intervals ofω<3020 andω>3965,and the corresponding instability was caused by the shear energy,which was provided by the thermocapillary force and pool rotation,respectively.In addition,the competition between thermocapillary force and pool rotation leads to three Hopf bifurcation points in the range of 3020<ω<3965 with the increase of Marangoni number. | TIAN Zu-an ZENG Zhong LIU Hao YIN Linmao ZHANG Liangqi QIAO Long | 2020 | Journal of Thermal Science2020，29，1： | 1 |
| 12 | Anisotropic Wear Resistance of Human Mandible Cortical Bone显示文摘 | Shanshan Gao Linmao Qian Haiyang Yu | 2009 | Tribology Letters2009，，1： | 1 |
| 13 | Tribological properties of self-assembled monolayers and their substrates under various humid environments显示文摘 | Qian Linmao Tian Fang Xiao Xudong | 2003 | Tribology Letters2003，15，3： | 1 |
| 14 | Tribological properties of self-assembled monolayers and their substrates under various humid environments显示文摘 | QIAN Linmao TIAN Fang XIAO Xudong | 2003 | TribologyLetters2003，15，3： | 1 |
| 15 | Nanofretting behaviors of NiTi shape memory alloy显示文摘 | QIAN Linmao ZHOU Zhongrong SUN Qingping | 2007 | Wear2007，263，： | 1 |
| 16 | Nanofretting behaviors of monocrystalline silicon(100) against spherical diamond tips in atmosphere and vacuum显示文摘 | YU Jiaxin QIAN Linmao YU Bingiun | 2009 | Wear2009，267，： | 1 |
| 17 | Nanofretring behavior of monocrystalline silicon(100) against SiO2 microsphere in vacuum显示文摘 | YU Jiaxin QIAN Linmao YU Bingjun | 2009 | Tribology Letters2009，34，： | 1 |
| 18 | Detection of element content in coal by pulsed neutron method based on an optimized back-propagation neural network 显示文摘 | Sang Haifeng Wang Fuli Liu Linmao | 2005 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms2005，239，3： | 1 |
| 19 | Mechanochemical reactions of GaN-Al_(2)O_(3) interface at the nanoasperity contact:Roles of crystallographic polarity and ambient humidity显示文摘Mechanochemical reactions of the GaN-Al_(2)O_(3) interface offer a novel principle for scientific and technological merits in the micro-/nano-scale ultra-precision surface machining.In this work,the mechanochemical reactions on Ga-and N-faced GaN surfaces rubbed by the Al_(2)O_(3) nanoasperity as a function of the environmental humidity were investigated.Experimental results indicate that the N-face exhibits much stronger mechanochemical removal over the relative humidity range of 20%-80%than the Ga-face.Increasing water molecules in environmental conditions significantly promotes the interfacial mechanochemical reactions and hence accelerates the atomic attrition on N-face.The hypothesized mechanism of the selective water-involved mechanochemical removal is associated with the dangling bond configuration,which affects the mechanically-stimulated chemical reactions via altering the activation energy barrier to form the bonding bridge across the sliding interface.These findings can enrich the understanding of the underlying mechanism of mechanochemical reactions at GaN-Al_(2)O_(3) interface and a broad cognition for regulating the mechanochemical reactions widely existing in scientific and engineering applications. | Jian GUO Jian GAO Chen XIAO Lei CHEN Linmao QIAN | 2022 | Friction2022，10，7： | 1 |
| 20 | Detection of element content in coal by pulsed neutron method based on an optimized back - propa- gation neural network 显示文摘 | Sang Haifeng Wang Full Liu Linmao | 2005 | Nuclear Instruments and Methods in Physics Research B2005，239，： | 1 |
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