圆片刀超声切削Nomex蜂窝芯的切削力和表面质量研究

为了研究圆片刀加工参数对切削力和表面质量的影响,首先对圆片刀超声切削和普通切削的切削力进行了理论分析,在此基础上开展了圆片刀超声切削Nomex蜂窝芯试验,获得了进给速度、刀具转速和超声振幅对切削力的影响规律.进一步以蜂窝芯孔壁撕裂数量和长度作为加工表面质量的表征参数,定量研究了加工参数对于蜂窝芯表面质量的影响.试验结果...     

FGH97粉末冶金高温合金热处理工艺和组织性能的研究

对采用两种制度热处理的FGH97镍基高温合金进行了组织性能对比.结果表明,固溶淬火和时效温度、保温时间及冷却方式直接影响该合金中γ'强化相、不同类型碳化物等析出相的形貌、尺寸、数量和分布.两种制度热处理后的试样中γ'相和碳化物的不同匹配度,决定其各自具备良好的综合力学性能.制度Ⅰ试样的拉伸和持久塑性和750℃持久性能高于制度Ⅱ;制度Ⅱ试样的拉伸强度、650℃持久强度以及抗蠕变性和低周疲劳性能高于制度Ⅰ.     

基于Mn3+浓度和形貌控制的高性能LiNi0.5Mn1.5O4正极材料

为了改善高电压镍锰酸锂(LiNi_(0.5)Mn_(1.5)O_4)材料的电化学性能,提出利用退火热处理过程调控Mn~(3+)含量和材料形貌来制备LiNi_(0.5)Mn_(1.5)O_4正极材料。LiNi_(0.5)Mn_(1.5)O_4材料的电性能是材料结构、形貌等多因素影响的结果。退火热处理有助于Mn~(3+)氧化成Mn~(4+),实现Mn~(3+)含量调控。退火后材料的空间结构由Fd3m向P4_332转变,且具有微米级多面体形貌,有效提高了循环稳定性和放电平台。研究表明:700℃退火保温15 h合成的材料在20 C下具有118 mAh·g~(-1)放电比容量,循环100次容量保持率提高到92.8%。因此,通过优化Mn~(3+)含量、控制材料形貌可以实现高性能LiNi_(0.5)Mn_(1.5)O_4材料制备。     

Investigation on surface integrity of electron beam melted Ti-6Al-4 V by precision grinding and electropolishing

Electron beam melting (EBM), as an excellent Additive Manufacturing (AM) technology, enables the printing of Ti-6Al-4 V alloy for a wide range of applications such as aerospace and biomechanical industries. It improves functionality and integrity of components and negates complexities in assembly processes. However, due to the poor surface and sub-surface integrity represented by the rough surface finish and low dimensional accuracy, achieving a favorable surface condition is quite challenging. Therefore, post processing becomes essential for these electron beam melted (EBM-ed) Ti-6Al-4 V alloys. Being the most common technique to improve such parts, milling of Ti-6Al-4 V alloy is very challenging and resulting tool wear issues, due to its unique material properties. Thus, this paper presents a comprehensive study on the surface integrity of EBM-ed Ti-6Al-4 V parts processed by precision grinding and electropolishing, aiming to qualitatively and quantitatively clarify the interrelation between process parameters and processed surface quality. The surface and subsurface characteristics such as profile accuracy, surface roughness, microstructure, defective layer and residual stress before and after post processing were compared and evaluated. The results show that by precision grinding, the profile accuracy was improved from over 300 µm PV to 7 µm PV, while surface roughness (R_a) was reduced from 30 µm to about 2 µm. The layer with partially melt particles was removed, but introduced a deformed subsurface layer with more residual stress. Then by applying electropolishing, the residual stress was released and the deformed layer was removed. In addition, R_a was further reduced to 0.65 µm. The research can serve as a reference for the integration of post machining processes with AM.     

METHIS: Mercury thermal infrared spectrometer

The BepiColombo mission to Mercury is devoted to the thorough exploration of Mercury and its environment, with the aim to understand the processes of planetary formation and evolution in the hottest part of the protoplanetary nebula. This mission represents an unique opportunity for the European community to extend the understanding of the Solar Nebula evolution from its outer edge – ideally represented by comets – to its inner and warmer edge. Obviously this exploration asks for a detailed knowledge of the main constituents of the matter present in the different Solar System areas. Spectroscopy is a powerful tool to acquire this knowledge. We have participated with a large consortium of European researchers to the development of the Rosetta imaging spectrometer. We propose here to use our experience to develop a newly designed spectrometer to investigate the mineralogical composition of the Mercurial surface. Given the particular thermodynamical situation of the Mercurial surface, we have developed a concept that combines a medium IR low spectral resolution imager with a moderate spectral resolution NIR point spectrometer. The main goal of METHIS is to provide the mineralogical characterisation of the surface with sufficient spectral resolution in a scientifically diagnostic spectral range.     

Tribological evaluation of surface modified H13 tool steel in warm forming of Ti–6Al–4V titanium alloy sheet

The H13 hot-working tool steel is widely used as die material in the warm forming of Ti–6Al–4V titanium alloy sheet. However, under the heating condition, severe friction and lubricating conditions between the H13 tools and Ti–6Al–4V titanium alloy sheet would cause difficulty in guaranteeing forming quality. Surface modification may be used to control the level of friction force, reduce the friction wear and extend the service life of dies. In this paper, four surface modification methods(chromium plating, TiAlN coating, surface polishing and nitriding treatment)were applied to the H13 surfaces. Taking the coefficient of friction(CoF) and the wear degree as evaluation indicators, the high-temperature tribological behavior of the surface modified H13 steel was experimentally investigated under different tribological conditions. The results of this study indicate that the tribological properties of the TiAlN coating under dry friction condition are better than the others for a wide range of temperature(from room temperature to 500 C), while there is little difference of tribological properties between different surface modifications under graphite lubricated condition, and the variation law of CoF with temperature under graphite lubricated is opposite to that under the dry friction.     

Mechanical study on initial profile solution for inflatable reflector made of orthotropic material

The woven fabric membrane materials are widely used in space and terrestrial inflatable reflectors. However the material?s anisotropy makes the design analysis more complex. The deviation from the desired shape, so-called “W-profile error”, influences the precision of the membrane surface significantly. In this study, a model of an axisymmetric paraboloid surface using membrane theory is established for the purpose of facilitating the surface precision optimization. Analytical solutions for displacements of the reflector are derived. An iteration method of initial reflector profile solution is stated and a finite element (FE) software employed in the solution is presented. A case study is illustrated to make a comparison between numerical and theoretical analyses. Finally, the conclusions are drawn that the analytical method and the FE iterative method for initial profile solution are feasible and efficient.     

Surface effects on the free vibration behavior of postbuckled circular higher-order shear deformable nanoplates including geometrical nonlinearity

This investigation deals with the free vibration characteristics of circular higher-order shear deformable nanoplates around the postbuckling configuration incorporating surface effects. Using the Gurtin–Murdoch elasticity theory, a size-dependent higher-order shear deformable plate model is developed which takes account all surface effects including surface elasticity, surface stress and surface density. Geometrical nonlinearity is considered based on the von Karman type nonlinear strain–displacement relationships. Also, in order to satisfy the balance conditions between bulk and surfaces of nanoplate, it is assumed that the normal stress is distributed cubically through the thickness of nanoplate. Hamilton?s principle is utilized to derive non-classical governing differential equations of motion and related boundary conditions. Afterwards, an efficient numerical methodology based on a generalized differential quadrature (GDQ) method is employed to solve numerically the problem so as to discretize the governing partial differential equations along various edge supports using Chebyshev–Gauss–Lobatto grid points and pseudo arc-length continuation technique. A comparison between the results of present non-classical model and those of the classical plate theory is conducted. It is demonstrated that in contrast to the prebuckling domain, for a specified value of axial load in the postbuckling domain, increasing the plate thickness leads to higher frequencies.     

晶振式非接触表面轮廓传感器的动态特性

从理论上对线性伸展模式的石英振子的动态特性进行了分析，讨论了在近场效应作用下，影响晶振品质因数的各种阻尼，并将所获得的解析模型与实验结果进行了比较。     

模H-Nielsen数(2)

通过研究自映射ｆ在π１（Ｘ，ｘ０）上的作用ｆπ，发现只要适当地选取π１（Ｘ，ｘ０）中子群Ｈ（ｆπ，π１）作为正则复迭空间的子群，得到模Ｈ－Ｎｉｅｌｓｅｎ数等于Ｎｉｅｌｓｅｎ数的结果，从而简化了用模Ｈ－Ｎｉｅｌｓｅｎ数计算Ｎｉｅｌｓｅｎ数的过程。