Search results

The density, mechanical properties and thermophysical properties of ZrB2 - based ceramic materials had been improved significantly [9-11].
Among them, ZrB2 ceramics with 20%SiC added had the best mechanical properties [2, 4, 7, 9].
However, to our best knowledge, previous researches mostly focused on the mechanical and thermal shock properties of composites [15, 20, 21].
[15] Yan, C., et al., Effect of PyC interphase thickness on mechanical and ablation properties of 3D C f /ZrC–SiC composite.
[22] Das, J., et al., Microstructure, mechanical properties and oxidation behavior of short carbon fiber reinforced ZrB2-20v/oSiC-2v/oB4C composite.

Introduction The shape and position error on mechanical processing of the workpiece will not only affect the overall quality of the mechanical products, but also affect interchangeability of parts.
The flatness tolerances on mechanical workpiece can reflect the smoothness degree of the workpiece plane, having a significant impact on measurement accuracy (with the binding properties of the plane) and sealing performance of the instrument.
The minimized risk function R (c, ε) is equivalent to the function J: (4) Where, ξi and ξi* are the relaxation factors.
Table 1 The processing test data of ultra-precision lathe machining surface The number of sets n/(r·min-1) u(mm·min-1) U/V f/μm 1 200 50 125 0.27 2 400 100 65 0.24 3 500 150 100 0.18 4 300 134 55 0.24 5 800 145 70 0.13 6 200 80 130 0.25 7 400 130 150 0.28 8 500 180 120 0.25 9 300 172 95 0.22 10 400 190 85 0.19 … … … … … 46 250 50 110 0.18 47 450 100 145 0.13 48 550 120 115 0.24 49 350 90 85 0.27 50 300 190 115 0.31 2.4 The creation of soft-sensing model of flatness error on the surface of machining workpiece According to processing factors which affect flatness on the surface machined by ultra-precision lathe, as shown in figure 1, the structure of soft-sensing model of flatness error on the machining surface is established, the speed of spindle n, the moving speed of carriage uy and the voltage of piezoelectric ceramics micro-feed drive U are used as input parameters of soft-sensing model of flatness error on the machining surface, the actually measured value of flatness error f is used
Advances in Mechanical Engineering, 2010, 2010: 1-11

Hydration heat, one of the most severe factors, makes great effects on the mass concrete construction, especially on bridge structures and dam structures.
So the study of pier concrete heat of hydration properties is necessary for the actual construction.
Calculation Parameters Thermal properties of the concert include thermal diffusivity, thermal conductivity, specific heat and density.
It has thermal conductivity properties.
And the concrete temperature during casting is an important factor affects concrete maximum temperature.

Introduction Soil has various properties, including elastoplasticity, dilatation, shear contraction, stickiness and so on.
Rheologicy is one obvious and important mechanical property of soft soil, so it must be taken into account when it comes to engineering in soft soil.
Viscoelasto-Plastic Model with Double Yield Surface A great number of tests show that Mechanical properties of saturated soft soil are very complex and it has elasticity, plasticity and viscosity.
The physical and mechanical properties of the foundation soil are shown in Table.1 and Table.2.
The model can affect the plastic properties, including dilatation and shear contraction and stickiness of soft soil comprehensively.

However, these materials often have poor mechanical properties and varied properties and degrade rapidly.
In addition, the physicochemical property of the material surface is also an important factor closely related to the behavior of cells.
Because the cell growth is affected by mechanical forces and chemical substances, which subsequently affecting the formation of cartilage, addition of signal factors or growth factors to synthetic materials can promote the formation of tissue-engineered cartilage both in vivo and in vitro.
Nanostructure scaffolds have good mechanical properties, that match with cartilage biomechanical environment, and maintain the stability and integrity of the structure in the body.
Effects of harvest and selected cartilage repair procedures on physical and biochemical properties of articular cartilage in the canine knee.

Because it has superior property such as high intensity, high hardness, resistance to abrasion, resistance to corrosion, resistance to high temperature and light weight[1].
Under normal circumstances, utilizing regression analysis can get more precise model when there is less affecting factors and clear regression model.
During process of engineering ceramics electro-spark machining, Factors that most affect surface roughness which is attainable are peak current, pulse width and pulse interval.
Removing these redundant attribute and rules won’t affect original category effect.
[2] Liu Yonghong, Yu Lili, Xu Yulong, Study On Spark Discharge Channel Insulating Properties Of Engineering Ceramics Thermodynamic[J].

Modal Analysis of Gear Considering Temperature Based on ANSYS Yuan Hui Quan1,2,a, Ri Chol Nam2,3,b 1College of Science,Northeastern University, Shenyang, China 2School of Mechanical Engineering and Automatization, Northeastern University, Shenyang, China 3Department of Resource Develop Mechanical Engineering, Pyongyang University of Mechanical Engineering,Pyongyang, D.P.R.Korea ayuan_hq@163.com, bzhangliang545238@163.com Keywords: spur gear; temperature; thermal effect; ANSYS.
Generally speaking, in the course of working , due to loads or objective factors ,most of the power machinery cause changes in the dynamics of components and systems.
Temperature leads to thermal stress , thermal deformation and changes in material properties, therefore, affect the vibration characteristics .
Can be considered the natural frequency change due to temperature change has two factors; one is the material properties with temperature changes, the other is the thermal stress.
Here, A is the natural frequency without considering temperature change and thermal stress, B is the natural frequency only considering the temperature-dependent material properties, C is the natural frequency only considering　thermal stress，D is the natural frequency considering the temperature-dependent material properties　and thermal stress.

Researches on Lifetime Modeling of LED luminaires Huajing Li1, a, Lei Nie1, 2, b* ,Fei Huang1, c and Wenjing Xiang1,3,d 1School of Mechanical Engineering, Hubei University of Technology, Wuhan, 430068, P.
The temperature and vibration have great influence on the properties and materials of LED luminaires.
Owing to those properties, its application fields extend greatly [1,2].
This paper designed to explore the properties and performances of LED luminaires though interactive test.
However, the LED structure was varying and the affecting factors was changing.

At the same time, the shape factor of balconies affects their deformation and, thus their vulnerability.
Factors that increase the vulnerability of elements affected by water can be attributed to both the intrinsic characteristics of materials and their chemical composition [18].
Freezing undermines the building elements primarily by affecting the water and vapour present inside various materials [19].
The importance of considering materials’ properties, connections, and geometric characteristics of different components to reduce vulnerability was highlighted.
Siamardi: Evaluation of fracture energy and durability properties of pavement concrete incorporating blends of durable and non-durable limestone Aggregates: RSM modelling and optimization.

Due to its characteristic properties, each of these minerals affects the specific properties of individual cements.
It was found that the type of polymorphic phase affects the properties of the cement itself, when, for example, modification M1 reached up to 10% higher strengths than modification M3.
The aim is to optimize the Portland clinker production process so that the resulting product contains the largest possible amount due to important properties of monoclinic phases M1 and M3 [5].
The composition of raw material mixture and the setting of combustion parameters are among the primary factors that determine the final composition of clinker [6-7].
Another important factor influencing the phase composition of clinker, to which negligible attention has been paid so far, is mechanical-chemical activation.