Search results

Introduction ZL114A is widely used in aviation, aerospace and national defence and military due to its superior mechanical properties.
However, softening in weld fusion zone (WFZ) and heat affected zone (HAZ), as well as hot cracking were still the defects [2].
To decrease the occurrence of hot cracking in welding, both metallurgy method and technical process have to be considered, as they play primary factors leading to hot cracking.
Composition in WFZ was analyzed to determine the effects of adding alloy powders on the solidification crack in terms of metallurgy factors.
For ZL114A aluminum alloy, the solidification cracking is generated by many factors.

Goldschmidt introduced a tolerance factor (t), defined by RA, RB, RO are the radius of A, B, and O ions, respectively.
In general, the tolerance factor (t) is 0.8These small changes always have an important impact on the physical and chemical properties in the structure of perovskite materials.
Thus contributing to the properties change of oxygen adsorption and desorption and improving the catalytic activity.
Lu et.al [7]used several methods to synthesis LaMn0.8Mg0.2O3, and discovered the different preparation affect crystal structure, particle size and oxygen species in a large degree; consequently affect the methane catalytic activity.

Key words: Sensor; Scattering light; Coagulation; Tofu; Quality Abstract: Mechanical evolution of soymilk coagulation was investigated using a novel fiber optic sensor in order to solve the problem of instability in Chinese traditional tofu quality.
The coagulation conditions depend on a number of factors including soymilk concentrations, coagulant type, coagulation pressure and temperature, and coagulation time.
These methods explore the properties of tofu gel in various aspects.
Fig. 1 The experiment setup C Statistical analysis The detecting values for the first min of data were averaged to calculate the primitive value , the recorded detecting values were divided by its corresponding primitive value to obtain the scattering light ratio for analyzing properties of the fiber optic sensor.
A. , The effect of temperature and inoculum concentration on rheological and light scatter properties of milk coagulated by a combination of bacterial fermentation and chymosin.

This experiment shows that the chemical properties of the cracked shell (chloride ions and organic matter content) can have a greater influence on durability than the mechanical properties of permeable concrete.
Razaei, “Effect of Natural Pozzolan on Concrete’s Mechanical Properties and Permeability in Various Grades of Cement”
Mohammad et al., “Physical and mechanical properties of fired industrial waste-clay bricks from clam shells and soda lime silica glass,” Mater.
Yu, “Unified calculation method and its application in determining the uniaxial mechanical properties of concrete,” Front.
SPRINKEL, “Concrete Properties,” Transp.

Introduction Liquid metal forming is to fill liquid metal into molds and cool down to normal temperature, which containing some complex factors influence to cast quality.
Actually, the casting shape, materials diversity and the nonlinearity change of material thermal property make the solidification process to be very complex.
Defining the thermal properties parameters of steel casting and sand mold are listed in Table 1 and Table 2, the primary temperature of casting is 1670°C, the primary temperature of sand mold is 25°C, the air temperature is 23°C, the convection coefficient is 65W/(m2·°C), temperature field distribution and the variation are analyzed.
Figure.1 Steel-casting and sand mold cross-section Table 1 The thermal properties parameters of steel casting temperature°C coefficient of heat conductivity W/( m2·°C) enthalpy (J/m3) 25 29.8 0 1543 31.2 7.5E9 1695 24.5 9.8E9 1670 24.6 1.3E10 Table 2 The thermal properties parameters of sand mold coefficient of heat conductivity W/( m2·°C) Density kg/m3 specific heat J/( kg·°C) 0.52 1630 110 Figure.2 The enthalpy change curve of phase transition process The finite element analysis of casting process temperature field.
Mechanical Structure Finite Element Analysis.

In work process of the cone valve, because of the throttle opening and the complexity of the runner, the condition of fluid in the internal flow is very complicated, and it has great influence on various properties of the cone valve such as flow characteristic, energy utilization, fluid noise, and control performance, and so on.
As the vortex is the main factor of producing noise, the noise of cone valve in the working process is bigger.
Because of cavitation production, cavitation phenomenon appears, and this will seriously affect the performance of hydraulic system components, and make their life down.
Mechanical Design Example Tutorial[M].
China Mechanical Engineering, 1999,2

Numerical Simulation of the Effect of the Uneven Wall on the Liquid Film Flow Mei Liu a, Yongxin Zhub and Songling Wangc School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding, China aliumei_w@163.com, b zhuyongxin_hd@163.com, chdwangsl@163.com Keywords: Liquid film, flow characteristics, inclined uneven wall, numerical simulation, VOF Abstract.
Beata [7] established a two-phase countercurrent structured packing model to determine the effect of liquid and gas flow rates and physical properties of the flowing liquids on the interfacial area.
Results and Analysis Wall structure is an important factor affecting film flow characteristics.
Different wall structures affect the film formation strongly, and the smaller corrugated size λ contributes to the formation of a continuous film.The vortex generated at the wall trough is directly related to the inlet velocity, and the vortex region increases with the inlet rate.

It is the matrix-inclusion interfacial damage and the matrix crack propagation damage that resulted in the poor properties above.
And some topology characters, such as different mixed distribution, will directly affect the matrix-inclusion interfacial damage and the matrix crack propagation damage [3-9].
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 1993, A172(1-2): 63~69 [4] Llorca J.
,Gonzalaez C.Microstructural factors controlling the strength and ductility of Particles-reinforced metal-matrix composites.
The influence of Particles distribution on the mechanical response of a particulate metal matrix composites.

It is the matrix-inclusion interfacial damage and the matrix crack propagation damage that resulted in the poor properties above.
And some topology characters, such as Depth-width ratio and Direction angle, will directly affect the matrix-inclusion interfacial damage and the matrix crack propagation damage [3-9].
Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 1993, A172(1-2): 63~69 [4] Llorca J.
,Gonzalaez C.Microstructural factors controlling the strength and ductility of fiber-reinforced metal-matrix composites.
The influence of fiber distribution on the mechanical response of a particulate metal matrix composites.

This information is significant from the point of view of functional properties.
During these processes as well as during heat treatment, on the way of obtaining final shape and mechanical properties, intense oxidation of the material surface takes place.
During hot and cold working, including extrusion, an adequate internal structure is formed directly affecting the shape memory effect [9].
In polycrystalline materials, this value is much lower and depends on many factors.
Wasilewski, 55-Nitinol – The Alloy with a Memory: Its Physical Metallurgy, Properties and Applications.