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| 1 | Review of prediction for thermal contact resistance显示文摘Theoretical prediction research on thermal contact resistance is reviewed in this paper. In general, modeling or simulating the thermal contact resistance involves several aspects, including the descriptions of surface topography, the analysis of micro mechanical deformation, and the thermal models. Some key problems are proposed for accurately predicting the thermal resistance of two solid contact surfaces. We provide a perspective on further promising research, which would be beneficial to understanding mechanisms and engineering applications of the thermal contact resistance in heat transport phenomena. | WANG AnLiang1 & ZHAO JianFeng2 1 School of Astronautics, Beihang University, Beijing 100191, China China Academy of Space Technology, Beijing 100094, China | 2010 | Science China(Technological Sciences)2010，53，7： | 9 |
| 2 | Crystallization and thermal fatigue of ZrTiCuNiBe bulk amorphous alloys heated by laser pulses显示文摘The crystallization and thermal fatigue behavior of Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloys heated by laser pulses was investigated. The results showed that crystallization occurred even below the crystallization temperature Tx in a low cycle time. Cracks appearred before or after crystallization of the heated area in the sample. The crystallization degree increased with the heating temperature and cycles. An increase in the fatigue cracks number was also observed. The plastic deformation in the heated area of the sample surface occurred, and became more pronounced with cycles and heating temperature. | JING Qin, ZHAO Liang, YUAN Hui, ZHANG Bing, NIU RunBing, ZHANG Jin, LI Gong, MA MingZhen & LIU RiPing State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，3： | 8 |
| 3 | TG6钛合金的热稳定性及其在高温下的部分恢复(英文)显示文摘测试了TG6钛合金盘锻件STA状态+再经600℃,100h试样热暴露在不同温度下的拉伸性能。TG6钛合金随着温度升高,抗拉强度下降,塑性提高。在室温下,与STA状态试样相比,经热暴露后的试样拉伸塑性显著降低,而当测试温度在150℃以上时,试样热暴露后的拉伸塑性显著提高,亦即热稳定性得到很大程度的恢复。引起TG6钛合金热稳定性下降的主要因素是有序α2相的共格析出和表面氧化。在150℃以上的高温条件下,热稳定性的恢复归因于位错滑移模式的变化,随着温度的升高,由位错剪切α2相的集中平面滑移逐渐向位错交滑移转变,促进位错更为均匀的滑移,从而提高塑性,表现在断口上为宏观的平面形向波浪形断裂特征的转变。 | 蔡建明 黄旭 曹春晓 马济民 | 2010 | 稀有金属材料与工程2010，39，11： | 7 |
| 4 | Thermal deformation of aluminum alloy casting materials for tire mold by numerical analysis显示文摘Thermal deformation of aluminum alloy casting materials for manufacturing the tire mold was numerically investigated.The AC7A and AC4C casting material was selected as casting material and the metal casting device was used in order to manufacture the mold product of automobile tire in the actual industrial field.The temperature distribution and the cooling time of casting materials were numerically calculated by finite element analysis (FEA).Also,the thermal deformation such as displacement and stress distribution was calculated from the temperature results.The thermal deformation was closely related to the temperature difference between the surface and inside of the casting.The numerical analysis results reveal that the thermal deformation of AC7A casting material is higher than that of AC4C casting material.Also,the thermal deformation results at the central part are larger than that on the side of casting because of the shrinkage caused by the cooling speed difference. | Hee-Sung YOON Je-Se CHOI Yool-Kwon OH | 2012 | 中国有色金属学会会刊:英文版2012，22，S3： | 6 |
| 5 | Thermal Influence of the Couette Flow in a Hydrostatic Spindle on the Machining Precision显示文摘Hydrostatic spindles are increasingly used in precision machine tools. Thermal error is the key factor affecting the machining accuracy of the spindle, and research has focused on spindle thermal errors through examination of the influence of the temperature distribution, thermal deformation and spindle mode. However, seldom has any research investigated the thermal effects of the associated Couette flow. To study the heat transfer mechanism in spindle systems, the criterion of the heat transfer direction according to the temperature distribution of the Couette flow at different temperatures is deduced. The method is able to deal accurately with the significant phenomena occurring at every place where thermal energy flowed in such a spindle system. The variation of the motion error induced by thermal effects on a machine work-table during machining is predicated by establishing the thermo-mechanical error model of the hydrostatic spindle for a high precision machine tool. The flow state and thermal behavior of a hydrostatic spindle is analyzed with the evaluated heat power and the coefficients of the convective heat transfer over outer surface of the spindle are calculated, and the thermal influence on the oil film stiffness is evaluated. Thermal drift of the spindle nose is measured with an inductance micrometer, the thermal deformation data 1.35 μm after running for 4 h is consistent with the value predicted by the finite element analysis's simulated result 1.28 μm, and this demonstrates that the simulation method is feasible. The thermal effects on the processing accuracy from the flow characteristics of the fluid inside the spindle are analyzed for the first time. | CHEN Dongju FAN Jinwei LI Haiyong WANG Xiaofeng ZHANG Feihu | 2013 | Chinese Journal of Mechanical Engineering2013，26，3： | 5 |
| 6 | Microstructure and homogenization process of as-cast GH4169D alloy for novel turbine disk显示文摘To investigate the microstructure, segregation, and suitable homogenization process of as-cast GH4169D alloy, the microstructure, elements segregation, and precipitates of cast GH4169D ingots prepared by vacuum induction melting (VIM) and vacuum arc remelting (VAR) were observed by optical microscopy (OM), scanning electron microscopy, and energy-dispersive X-ray spectroscopy (EDS). According to the residual segregation model and simulation results of DICTRA thermodynamic software, the homogenization temperature and time range were set as 1120–1170°C and 5–20 h, respectively. The experimental results showed that microscopic dendrite and element segregation occurred in the interior of ingots and the main segregation elements were Nb and Ti. In addition, the precipitates were mainly distributed in interdendritic regions and were composed of NbC, Laves,γ′, and δ phases. The homogenization process suggested that the interdendritic detrimental precipitated Laves phase can be eliminated or redissolved after homogenization at 1150°C for 20 h, suggesting it was the most suitable homogenization treatment. Thermal compression test results showed that the GH4169D alloys after homogenization treatment had no cracks and dynamic recrystallization occurred, with recrystallization volume fraction increasing with temperature, indicating a good working plasticity at temperatures from 1050 to 1200°C. | Kai Chen Shu-yuan Rui Fa Wang Jian-xin Dong Zhi-hao Yao | 2019 | International Journal of Minerals,Metallurgy and Materials2019，26，7： | 4 |
| 7 | Thermal deformation behavior and microstructure of nuclear austenitic stainless steel显示文摘Gleeble-1500D thermal simulation tester was employed in the hot-compression investigation of as-cast nuclear 304 austenitic stainless steel under conditions: deformation temperature 950―1200℃; deformations 30% and 50%; deformation rates 0.01 and 0.1 s?1. The results show that the flow stress decreases with temperature rise under the same strain rate and deformation, that the flow stress increases with deformation under the same temperature and strain rate, and that the flow stress increases with strain rate under the same temperature condition, i.e., work hardening becomes distinct. Materials exhibit better strength-toughness when the strain rate is 0.01 s-1, the deformation is 50%, and the temperature is 1050℃. | LIU Jie FAN GuangWei HAN PeiDe LIU JianSheng GE DongSheng QIAO GuanJun | 2009 | Science China(Technological Sciences)2009，52，8： | 4 |
| 8 | 70 nm: The most unstable grain size in Cu prepared by surface mechanical grinding treatment显示文摘The stability of Cu with different average grain sizes prepared by surface mechanical grinding treatment were investigated under the conditions of isothermal annealing and uniaxial tension.In both conditions,experimental results revealed that the stability of the grains decreased with the decrease of grain size when the grain size was above 70–75 nm,while the stability of the grains increased with the decrease of grain size when the grain size was below 70–75 nm.The grains of about 70–75 nm in size showed the worst stability in both thermal and mechanical conditions due to having the highest level of average atom free energy and their large amount of high energy grain boundary with large curvature.This size was very close to the calculated smallest size achievable by severe plastic deformation based on the grain refinement mechanism of dislocation evolution under present processing condition,at which both the highest density of dislocation and highest energy should be produced and induces poor stability.Below 70 nm,the deformation mechanism of nanograined Cu was transformed into a partial dislocation motion,which activated mechanically induced grain boundary(GB)relaxation accompanied by GB flattening and GB energy decrease and resulted in enhanced stability.This discovery offers the potential for developing nanograined metals with high strength and high stability. | Xin Zhou Xiuyan Li Ke Lu | 2020 | Nano Materials Science2020，2，1： | 2 |
| 9 | Deformation prediction of porcelain-enameled steels with strain history by press forming and high-temperature behavior of coating layer显示文摘Porcelain enamel coatings were widely applied for the protection of steel products because they offered high corrosion protection,resistance to heat and abrasion,high hardness,hygiene and ease of cleaning.The typical process to produce enameled steels is roughly divided into two stages:the first stage consists of a forming process to give the desired shape to a steel substrate,and the second stage consists of a firing process to bond enamel frits on the substrate.This firing process requires a high temperature above 800 °C,which may lead to austenitic transformation and severe thermal deformation of the steel substrate.The aim of this study is to develop a finite element analysis (FE analysis) technique to predict the mechanical and thermal deformations of the enameled steels during forming and any further enameling process,including firing.The FE analysis involves analyzing the strain history of the steel substrate,which comprises the stress and thickness distributions of the substrate and its deformed shape,and the high-temperature behavior of the enamel coating layer.The validity of the FE analysis is verified through the U-bending test and firing test with various numbers and positions of enamel coating layers on the substrate.The results reveal that the FE analysis results agree well with the experimental results with 8% error. | Young-Ki SON Chan-Joo LEE Jung-Min LEE Byung-Min KIM | 2012 | 中国有色金属学会会刊:英文版2012，22，S3： | 2 |
| 10 | Two-Way-Coupling Method for Rapid Aerothermoelastic Analyses of Hypersonic Wings显示文摘Several types of coupling methods for resolving aerothermoelastic problems associated with hypersonic wings are summarized,and the appropriate coupling methods for engineering calculations are selected.Then,the calculation and analysis methods for the subdisciplines in this field are introduced,and the time step issue is discussed.A two-way-coupling rapid static aerothermoelastic method for analyzing hypersonic wings is proposed.This method considers thermal effects and is used to conduct an aerothermoelastic response analysis for a hypersonic wing.In addition,the aerodynamic force,heat flux,structural deformation and temperature field are obtained.The following three conclusions are drawn.First,the heating effect has a significant impact on the static aeroelastic response of hypersonic wings;therefore,thermal protection shields are essential.Second,the application of thermal protection shields reduces the differences in the calculation results between the one-and two-way-coupling methods.Third,hypersonic wings exhibit large thermal deformation under high-temperature environments,and in certain cases,the thermal deformation is even larger than the deformation caused by aerodynamic force. | Wan Zhiqiang Yi Nan Li Guoshu Yang Chao | 2018 | Transactions of Nanjing University of Aeronautics and Astronautics2018，35，1： | 1 |
| 11 | THERMAL ACTIVATION ANALYSIS ON TENSILE DEFORMATION IN Ti47Al2Mn2Nb ALLOY显示文摘Activation volume V , activation enthalpy Δ H , activation free enthalpy Δ G and activation entropy Δ S of tensile deformation of Ti 47Al 2Mn 2Nb alloy with near lamellar microstructure were measured at yield point using strain rate jumping method in a temperature range from 77 K to 1 373 K. Based on the measured values of activation parameters and temperature dependence of tensile properties, different thermally activated dislocation motion mechanisms were speculated to control tensile deformation of the alloy in three temperature regions: in low temperature region (77~398 K), the mechanism is mainly characterized by the overcoming of Peierls Nabarro friction; in intermediate temperature region (398~1 073 K), the mechanism is an abnormally weak thermal activated motion; in high temperature region (1 073~1 373 K), dislocation climbing is the controlling mechanism. | Yu Wang 1) , Dongliang Lin (T. L. Lin) 1) and Chi C.Law 2) 1) School of Materials Science and Engineering, Shanghai Jiao Tong University, Open Laboratory of Education Ministry of China for High Temperature Materials and Tests, Shanghai | 1999 | 中国有色金属学会会刊:英文版1999，9，S1： | 1 |
| 12 | Study on Thermal Deformation Measurement of Optical RemoteSensing Satellite Platform Based on Machine Vision显示文摘To solve the special requirements of the high orbit optical remote sensing satellite for the thermal deformation of the platform the thermal deformation test and measurement scheme of the satellite platform is designed. Through the comparative analysis of test results the rationality of the thermal deformation design of the platform structure is verified. The results of thermal deformation measurement show that the maximum deformation of A camera mounting surface is 57.5〃 and the maximum deformation of B camera mounting surface points to 79.3〃 which can be used as the basis for thermal deformation prediction of satellite during the orbit operation. | Jie Huang Chaolan You Peng Hou Da Luo Xiangsen Kong Xin Fu | 2019 | Journal of Harbin Institute of Technology(New Series)2019，26，5： | 1 |
| 13 | STUDY OF THERMAL DEFORMATION OF MICROELECTRONICS PACKAGING PRODUCT BY INTERFEROMETRIC TECHNIQUE显示文摘In this paper,the out-of-plane deformation of silicon surface ofDirect Chip Attachment(DCA)assembly,under thermal loading,was measured inreal-time by Twyman/Green interferometry.The contour maps of the out-of-planedisplacement fields of silicon surface under thermal loading and cycling of varioustemperature were obtained.Experimental results show that the relation betweenthe out-of-plane displacement and temperature is nonlinear and varies with tempera-ture cycling,due to nonlinear mechanical behavior of the materials used in electronicpackaging.A comparison of the out-of-plane displacement fields of silicon surfacemeasured by T/G interferometry in real-time and replicating technique of high tem-perature specimen grating of moire interferometry was made. | 卿新林 王国韬 戴福隆 | 1997 | Acta Mechanica Sinica1997，13，2： | 1 |
| 14 | Research on valve core’s clamping stagnation of double flapper-nozzle servo valve显示文摘Due to great changing of instantaneous temperature of hydraulic oil of double flapper-nozzle servo valve, thermal deformation between valve core and valve sleeve may result in catching phenomenon of valve core, and then the reliability of servo valve could be affected seriously. The work focuses on a particular model of double flapper-nozzle servo valve and establishes three dimension couple models of liquid-solid-thermal under extreme operating condition. The transmission route and dissipative mechanism of heat is revealed and thermal deformation behavior of valve core and valve sleeve is researched. A change law of the key fit clearance under the effect of thermal expansion and warp deformation is explored, the source of catching phenomenon of valve core is identified, and then preventive measure and improvement can be proposed. In order to verify the correctness of theoretical analysis, the moving smoothness of deformed valve core and reground valve core under the circumstance of high-temperature hydraulic oil on electrohydraulic servo valve static characteristics test table is compared and tested. The results show that as oil temperature rises, relative deformations between valve core and valve sleeve in different direction at a same cross-section are not equal, and then the key fit clearance is less than the initial value. Relative deformations in the same direction at different axial position are not equal, the deformations of middle and two ends are maximum and minimum values respectively, and then warp deformation of valve core occurs. When oil temperature is higher, the relative deformations between valve core and valve sleeve is larger, the moving smoothness of valve core gets worse, and the catching phenomenon of valve core occurs. Axial deformation of valve sleeve and valve core at different axial position is different, and the opening coefficient and stability of servo valve could be affected, especially the operation circumstance of small opening. The study can provide some guidance for designing double nozzle flapper servo valves. | 赵建华 Zhang Bin Chen Tao Wang Qiang Zhou Songlin Gao Dianrong | 2019 | High Technology Letters2019，25，1： | 1 |
| 15 | Fabrication of high temperature grating on thermal barrier coatings based on solute-solvent separation soft lithography显示文摘In this study, an etched-SiO-film grating fabrication technique based on solute-solvent separation soft lithography is developed. By using this new technique, high temperature grating with frequency of 600 lines/mm is successfully fabricated on the surface of thermal barrier coatings(TBCs). During the fabrication process, the microstructure and chemical compositions of ceramic coating before and after polishing is analyzed with a digital microscope and the energy dispersive X-ray spectroscope(EDS) in scanning electron microscope(SEM). And then the grating on TBCs is heated at the temperature ranging from 300℃ to 1000℃ for examining the high temperature resistance. In the practical application, the displacement and strain field around the crack on the ceramic surface are investigated with geometry phase analysis(GPA). The successful results verify that the etched-SiO-film grating has a good oxidation resistance and can be applied to high temperature deformation measurement of TBCs. | Bozhao Fan Huimin Xie | 2018 | Theoretical & Applied Mechanics Letters2018，8，1： | 1 |
| 16 | Thermal effects on clay rocks for deep disposal of high-level radioactive waste显示文摘Thermal effects on the Callovo-Oxfordian and Opalinus clay rocks for hosting high-level radioactive waste were comprehensively investigated with laboratory and in situ experiments under repository relevant conditions:(1) stresses covering the range from the initial lithostatic state to redistributed levels after excavation,(2) hydraulic drained and undrained boundaries, and(3) heating from ambient temperature up to 90℃-120℃ and a subsequent cooling phase. The laboratory experiments were performed on normal-sized and large hollow cylindrical samples in various respects of thermal expansion and contraction, thermally-induced pore water pressure, temperature influences on deformation and strength, thermal impacts on swelling, fracture sealing and permeability. The laboratory results obtained from the samples are consistent with the in situ observations during heating experiments in the underground research laboratories at Bure and Mont-Terri. Even though the claystones showed significant responses to thermal loading, no negative effects on their favorable barrier properties were observed. | Chun-Liang Zhang Nathalie Conil Gilles Armand | 2017 | Journal of Rock Mechanics and Geotechnical Engineering2017，9，3： | 1 |
| 17 | Wear analysis of a side dam in twin-roll strip casting显示文摘Reducing wear on a side dam can prolong the casting operation life of a twin-roll strip casting process,thus reducing production cost and improving casting stability.To lengthen the service life of the side dam,it is necessary to understand the wear performance of the side dam material.To investigate the wear behavior mechanism of the side dam,in this study,the UMT-2 friction and wear tester was used to determine the relationship between the wear rate of the side-dam material and various parameters.Based on the roughness of the contact area between the side dam and the end of the casting rolls as well as on the amount of deformation of the side dam,which was derived using a thermal-deformation simulation model,the reasons for the uneven wear of the side dam were obtained. | YE Changhong FANG Yuan ZHANG Yujun HAN Yuesheng | 2019 | Baosteel Technical Research2019，13，3： | 0 |
| 18 | Thermal Deformation Measurement and Stress Analysis of PQFP Assembly during Power Cycling显示文摘ThermalDeformationMeasurementandStressAnalysisofPQFPAsemblyduringPowerCyclingDaiFulong(戴福隆),ShiLing(石玲),WenXiumei(温秀梅)Departm... | 戴福隆 石玲 温秀梅 | 1998 | Tsinghua Science and Technology1998，3，2： | 0 |
| 19 | KRMN-TYPE EQUATIONS FOR A HIGHER-ORDER SHEARDEFORMATION PLATE THEORY AND ITS USE IN THE THERMAL POSTBUCKLING ANALYSIS显示文摘篕arman-type nonlinear large deflection equations are derived occnrding to theReddy’s higher-order shear deformation plate theory and used in the thermal postbuckling analysis The effects of initial geometric imperfections of the plate areincluded in the present study which also includes th thermal effects.Simply supported,symmetric cross-ply laminated plates subjected to uniform or nomuniform parabolictemperature distribution are considered. The analysis uses a mixed GalerkinGolerkinperlurbation technique to determine thermal buckling louds and postbucklingequilibrium paths.The effects played by transverse shear deformation plate aspeclraio, total number of plies thermal load ratio and initial geometric imperfections arealso studied. | 沈惠申 | 1997 | Applied Mathematics and Mechanics(English Edition)1997，18，12： | 0 |
| 20 | NUMERICAL SIMULATION FOR WIDE MAGNITUDE AND HIGH SPEED ALUMINUM FOIL MILL显示文摘NUMERICALSIMULATIONFORWIDEMAGNITUDEANDHIGHSPEEDALUMINUMFOILMILL①WangHongxuandLianJiachuangRolingStelInstitute,YanshanUniversi... | Wang Hongxu and Lian JiachuangRolling Steel Institute, Yanshan University, Qinhuangdao 066004, P. R. ChinaZhang Junliang and Chen ShuyunBohai Aluminum Industries Company Limited, Qinhuangdao 066000, P. R. China | 1998 | 中国有色金属学会会刊:英文版1998，8，2： | 0 |
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