Search results

The resulting values for wear factors in Archard’s equation indicate that changing contact and lubrication conditions during the pre- and the backstroke of oscillating processes have to be taken into account in wear modelling.
This is achieved by a decomposition of the wear index into material and lubrication related factors.
The parameter kad represents the wear factor and comprises all tribosystem specific wear properties.
Industrial and laboratory tests show that wear first affects area 2.
By this, the unidirectional wear factors are 9.57 respectively 45.05 times bigger than the wear factor of the oscillating experiments.

Anyway, FSW technology requires a meticulous understanding of the process and consequent mechanical properties of the welds in order to be used in the production of high performance components.
Many studies conducted on FSW of aluminum alloys show that a number of process parameters can affect the welding conditions and the weld properties [3].
Friction was modeled assuming a shear factor equal to 0.7.
The mechanical properties of the joints can be related to this behavior.
Distribution of the effective strain in the welded area, rotational speed equal to 1000 rpm (a) and 2000 rpm (b) Conclusive Remarks A FEM model for the simulation of the FSW process was set up to analyze how the thermal effects due to the different process parameters may influence the mechanical properties of the joints.

The results will be used to verify a numerical analysis model, which will be further used to conduct a parametric study of the influential factors.
Their application in timber structures against the longitudinal cracks has also been increasing; however, little research work has been done on how much the mechanical behavior of wood can be improved by wrapping fiber composite sheets.
The results will be used to verify a numerical analysis model, which will be further used to conduct a parametric study of the influential factors.
The material properties of the wood and fiber composite sheets were obtained from material properties tests.
Further study will conducted by using a numerical analysis model to take into more influential factors on the compressive behavior of wood with circumferential confinement.

Since the laser cutting of wood is thermal in nature, the factors modifying the input of laser energy significantly affect the process.
The kerf width was affected by significant interactions between factors were focal plane position with traverse speed, power and traverse speed and power with number of gas jets [7].
Significance of factors and their interactions can be computed using statistical analysis.
It was depending on the material type and other conditional factors.
Rizman: Numerical and Experimental Analysis of Activated Carbon Filter on the Mechanical Properties of Wood Composites.

Effect of La2O3 on the Properties of Combustion-Synthesized Molybdenum Disilicide Jian-Ying Gao a, Wan Jiang b, Gang Wang c State Key Lab of High Performance Ceramics and Superfine Microstructure, Chinese Academy of Sciences, Shanghai 200050, China a jygao@mail.sic.ac.cn, b wanjiang@mail.sic.ac.cn, c gangwang@csu.edu.cn Keywords: SHS, MoSi2, La2O3, Fracture toughness Abstract.
However, the major problem impeding practical applications of MoSi2 is its mechanical properties.
It is believed that the SiO2 inclusions segregated mainly at the grain boundaries of the sintered body, which could be an easy crack propagation path, accordingly deteriorating the mechanical properties of MoSi2 at room temperature [3].
The factor contributing to the difference between the two samples is also the faster nucleation rate.
It has been found that the addition of La2O3 also significantly affects the thermodynamics and kinetics of combustion process, by influencing the nucleation rate during SHS.

Traditionally, hot mechanical working has been one of the available procedures to minimize heterogeneities.
This limits the possibilities of mechanical homogenization during hot working.
Nevertheless, the same factors intervening in the initial grain heterogeneity can affect grain size evolution after deformation, that is, the TiN particle distribution.
In this case the proper selection of the recrystallized mean size is a key factor.
As shown in Fig. 8, the hardness levels are similar to those found at higher cooling rates, when fully bainitic structures form, but the presence of coarse grains that can impair toughness properties is significantly reduced (Fig. 10).

Following assumptions were made to establish the suitable mathematics model of heat transfer: When the metal is fluid flowing in the slope, neglect the radiant energy; neglect the hot deformation of slope; The metal liquid contact well with the slope and the heat transfer between them can be treated by equivalent heat transfer coefficient; The temperature of the magnesium alloy when the ladle poured into the slope and pouring speed are constant; The simulation period is between magnesium alloy be poured into the slope and flow out of the slope; Solid fraction and temperature of magnesium alloy have a linear relationship. 2 Physical Properties of materials 2.1physical properties of materials The material of metal liquid is AZ91D magnesium alloy and the material of slope is Cu-Al-bronze, their physical properties are shown in Table 1.
Table 1 Thermophysical Properties of AZ91D and Cu－Al－bronze material Temperature ( C o ) Latent heat (kJ/kg) Heat conductivity (W/m/k) Specific heat (kJ/kg/K) Density (Kg/m3) Mg-AZ91B 650 368.4 51.1 0.98 1855.5 Cu-Al-bronze 20 237 50.9 0.44 7650 2.2 confirmation of the thermal conductivity In casting-rolling system, the melts are in continuously moving state and there are both thermal convection and heat conduction, so the convective heat transfer must be considered in the equation.
Follow the process above, the average outlet temperatures of other 8 simulated experiments could be obtained, put the results above into the orthogonality software table and the main influencing factor could be found by the intuitive analytic result.
It could be found by comparing the extremes(R): CA B R R R> > , this shows that the length of slope is the main factor affects the outlet temperature of the slope, the initial pouring temperature is secondary and the influence of slope angle is minimum.
affects the temperature of semi-solid slurry little, but considering the flowing state of the melt in the slope, an angle of 40-60 o was appropriate.

Such material has unique physical-chemical properties.
Nanometer blocking agent composed of inorganic nanometer material, high-efficient dispersing agent and reaction rate control agent[6] is capable of a diameter at nanometer level (1-100 nm), high specific surface area and chemical properties with uniform grain size.
Mechanism of flooding by using nanometer microemulsion fluid is complicated and is affected by a large number of factors such as wettibility of rock surface and change of oil-water interfacial viscosity or rheology.
During flooding, loss of surfactant is one of the key factors affecting cost of microemulsion fluid flooding.
The experiment and research show that, mechanical and electromagnetic performances of nanometer synthetic material in individual directions differ greatly.

Cracks affect the durability of concrete by increasing its permeability.
The microbial precipitation of CaCO3 depends on several factors including: concentration of dissolved inorganic carbon, actually value of pH, concentration of calcium ions, and presence of energetically advantag for nucleation.
Sporosarcina pasteurii is a non-pathogenic, gram-positive, endospore forming soil bacterium well known for its ability to precipitate CaCO3 through ureolysis, its biggest disadvantage is that during the precipitation of CaCO3 urea is formed which negatively affects the resulting properties of concrete [8].
Experimental The experiment tested the dependence of nano / micro structural properties on time, namely the effect of bacteria on cracks healing in cement pastes over time.
In addition, the effect of bacteria on micromechanical properties at the interface between cement matrix and calcium will be studied.

Introduction The excellent mechanical properties of exotic materials such as titanium alloys, carbon fiber reinforced plastics (CFRP) and metal matrix composites (MMCs) have led to many applications in aerospace and high value added industries.
Water content is also a factor.
The “signal” is the square of the mean value of the results; whereas “noise” is a measure of the variability of the response, it is caused by uncontrollable factors (noise factors).
These results show the significance of each factor, and the rank of contributions each factor made to the results.
Missas, Factors affecting the ageing of transformer oil in 150/20 kV transformers.