金刚石圆锯片切割石材过程研究

将金刚石圆锯片切割石材过程中的加工对象、加工刀具、加工工艺作为一个有机研究对象，提出金刚石对石材的切割作用主要为挤压、滑擦和压碎；金刚石颗粒的损耗过程可分为正常损耗和异常损耗；探讨了加工工艺对金刚石颗粒损耗的影响。     

马钢炼钢污泥直接配入烧结混合料系统的研发及使用

针对马钢炼钢污泥产出量大、处理困难的现状,在研究国内污泥处理方法的基础上,提出滚筒给料,对辊打碎,大批量处理的新方法并立项攻关.经过研发、生产检验,证明该污泥配加系统原理可行,处理量大且不影响烧结生产,效益显著.     

氯化物排放与燃烧脱氯技术工业性试验研究

对某电厂煤粉炉除尘器前后HC1排放量进行了实测，并在垃圾流化床锅炉和链条炉上进行了燃烧脱氯试验。研究结果表明：(1)含氯废弃物是垃圾焚烧炉HC1排放最主要来源；(2)在流化床中，煤中氯化物排放浓度和排放率较低，单一钙基吸收剂的固氯效果比在链条炉中明显，脱氯剂种类与脱氯剂添加量对脱氯效果有一定影响；(3)链条炉燃烧温度高、燃料停留时间长，燃烧脱氯应采用耐高温脱氯剂，以解决脱氯产物CaCl2的再分解问题；(4)对于链条炉，采用脱氯剂半预混半喷射两段燃烧脱氯方式可使脱氯产物在炉内停留时间大大缩短，有效降低脱氯产物的分解率，因此可获得较好的脱氯效果。     

放电等离子烧结Bi2O3/Cu复合梯度靶材

采用放电等离子烧结技术制备了Bi2O3/Cu复合梯度靶材，利用扫描电子显微镜和能谱分析仪对材料的微观组织形貌及成分进行了分析。结果表明，合成的复合梯度靶材具有宏观组织不均匀性和微观组织连续性的特征，显微组织中不存在微裂纹，减小了热应力的影响。与单一成分靶材相比，复合梯度靶材的热导率显著提高，解决了靶材在溅射过程中因散热不良而碎裂的问题，提高了其使用率。     

Analytical Model Development for Stokes-Type Settling in a Solidifying Fluid

Analytical modeling was used to track the mudline displacement of a simulated fluid dispersion that underwent a simulated linear increase in the fluid viscosity as a function of time following an induction period. Modeling results indicate two regimes of settling behavior from the driving force of density differences between the particles and the fluid. A linear mudline movement was first determined in the regime of constant viscosity, and a logarithmic retarded mudline movement was numerically determined following a linear rise in fluid viscosity. The results show that the combination of settling and solidification leads to a transitional mudline movement similar to batch settling curves described by early settling theories.     

Fracture analysis of a functionally graded coating-substrate structure with a crack perpendicular to the interface - Part II: Transient problem

In Part I of this paper, the static problem of a functionally graded coating-substrate system with an internal or edge crack perpendicular to the interface has been studied. In this part, the transient response of the structure is considered under an in-plane impact. Laplace and Fourier transforms are applied to reduce the mixed boundary value problem to a singular integral equation which is solved in the Laplace domain numerically. The dynamic stress intensity factors (DSIFs) are obtained by numerical Laplace inversion technique. The influences of material constants and geometry parameters on the dynamic stress intensity factors are studied. It is found that the DSIFs for an internal crack rise rapidly to a peak and then tend to the steady value without obvious oscillations, but the DSIFs for an edge crack have more obvious oscillations after rising to a peak with the increasing of the nonhomogeneity constant.     

On debonding of graded thermal barrier coatings

Thermal barrier coatings generally consist of a metallic substrate which is the primary structural component, a metallic bond coat which serves as oxygen diffusion barrier, a very thin layer of thermally grown oxide and a ceramic top coat that provides the main thermal shielding. Homogeneous ceramic coatings as top coats appear to have certain undesirable features such as high residual and thermal stresses, generally low toughness and relatively poor bonding strength. The new concept of compositional grading of the top coat may help to overcome some of these shortcomings by eliminating the material property discontinuities. A common mode of failure in thermal barrier coatings seems to be the debonding of the top coat. In this study the related interface crack problem for a graded ceramic/metal top coat is considered. It is assumed that the thermophysical properties of the top coat continuously vary between that of the bond coat at the top coat-bond coat interface and that of the ceramic at and near the free surface. The main objective of the study is to examine the influence of the material nonhomogeneity parameters and relative dimensions on the stress intensity factors and the crack opening displacements.     

CAD modeling for the components made of multi heterogeneous materials and smart materials

There appear more critical requirements for special functions of components/products in various areas, which can be satisfied only by using heterogeneous materials and/or smart materials. The heterogeneous materials include composite materials, functionally graded materials, and heterogeneous materials with a periodic microstructure. To design and manufacture the components made of these materials, the computer models for representing them need first to be built so that further analysis, optimization and manufacturing can be implemented based on the models. This paper develops such a modeling method, which can be implemented by employing the functions of current CAD graphic software and obtain the model that includes all the material information (about periodic microstructures, constituent composition, inclusions, and embedded parts) along with geometry information in 3D solid modeling without the problem arising from too much data.     

功能梯度涂层热残余应力

涂层中的残余应力严重影响着涂层零件的机械完整性与操作可靠性。对于功能梯度涂层,由于各界面位移协调条件的限制,很难得到涂层内部残余应力的闭合解。基于传统的悬臂梁理论,获得了功能梯度涂层热残余应力的闭合解;这一分析模型的优点是残余应力的闭合解与涂层层数无关。讨论了采用传统的近似解所带来的误差, 针对含不同层数的ZrO2/NiCoCrAlY功能梯度涂层内部的残余应力进行了计算。另外,对应力诱导的涂层失效模型也进行了分析。     

Nonlinear bending response of functionally graded plates subjected to transverse loads and in thermal environments

Nonlinear bending analysis is presented for a simply supported, functionally graded rectangular plate subjected to a transverse uniform or sinusoidal load and in thermal environments. Material properties are assumed to be temperature-dependent, and graded in the thickness direction according to a simple power-law distribution in terms of the volume fractions of the constituents. The governing equations of a functionally graded plate are based on Reddy's higher-order shear deformation plate theory that includes thermal effects. Two cases of the in-plane boundary conditions are considered. A mixed Galerkin-perturbation technique is employed to determine the load-deflection and load-bending moment curves. The numerical illustrations concern nonlinear bending response of functional graded rectangular plates with two constituent materials. The influences played by temperature rise, the character of in-plane boundary conditions, transverse shear deformation, plate aspect ratio and volume fraction distributions are studied.