Search results

The FW parameters like the rotational speed, burn-off length, upset pressure and frictional pressure were found to affect the properties of the fabricated joints [3,4].
(4) Step 5: Determine the main effect (εi) of the factors using the Eq. 5 to find the optimal level.
Step 7: Perform ANOVA to predict the significant factors and conduct the confirmation test.
Noorul Haq, Effect of friction welding parameters on mechanical and metallurgical properties of ferritic stainless steel, Int.
Prasad Rao, A study of mechanical properties of friction welded mild steel to stainless steel joints, Mater.

This paper based on the in-situ data of "7.16 coal bump accident" of Chengshan coal mine, by summing up and analysis, determine three factors:the time, the gob and the nature of the top which may affect the energy accumulation,and simulating the influence of the energy accumulation the above three factors bring through Flac3D, according to the different level of influence of various factors on the energy distribution, obtaining the main control factors of energy distribution of coal bump.
(3)Through make the roof nature abated, research roof properties effects on energy distribution, and named it scheme 5.
In a word, each factor’s influence degree to energy distribution from big to small is: goaf, roof’s properties, time and the most effective influence is existing goaf in roof. 3.Conclusions The influence of time, goaf, roof’s properties on energy distribution law is simulated through different comparison method.
Get the conclusion: the above three factors can affect the elastic energy distribution nearby the working face
Therefore, the influencing extent from big to small is: goaf, roof’s properties and time.

The properties of C/C-SiC composites can be greatly influenced by the factors of GSI process such as the infiltration reaction temperature and the temperature of high temperature treatment (HTT) on C/C [11, 12].
Mechanical properties.
Figure 3 shows the mechanical properties of C/C-SiC composites with different HTT temperatures.
And the higher HTT temperature led to the higher level of decline of the mechanical properties.
(3) The mechanical properties of C/C-SiC composite were poorer after HTT on C/C green body.

This review paper focuses on the major factors of deterioration, specifically rutting, stripping, and moisture effects, which are key factors affecting road pavements globally.
Mechanical Properties and Advantages Sisal fibers possess a high tensile strength, comparable to or even exceeding that of some synthetic fibers.
SMA mixtures with 0.3% sisal fiber exhibited superior mechanical properties compared to dense-graded mixtures.
"Characterization of physico-chemical, thermal, and mechanical properties of Ethiopian sisal fibers."
"Concrete reinforced with sisal fibers (SSF): overview of mechanical and physical properties."

The specific properties that affect welding are; high affinity to oxidation, oxide characteristic, the solubility of hydrogen in molten aluminum, and wide range of mechanical properties and melting temperatures that result from alloying with other metals.
Therefore, the selection of the proper welding process parameters is very essential for obtaining optimal mechanical properties.
In this work Taguchi method with grey relational analysis has been applied to find the optimal weld bead geometry and mechanical properties of 2219 Aluminum alloy.
The experimental design proposed by Taguchi involves using LN(kn) OA (where N represent the number of experimental run, n is the numbers of parameters/factors and k is the number of levels) to organize the parameters affecting the process and the levels at which they should be varied.
The selection of the OA depends on the number of studied factors and the number of levels for each factor.

A high alkali environment of concrete with pH higher than 12.0 acts mainly on glass fibres which degrade and their mechanical properties are reduced consequently.
Long-term Tensile Properties of FRP Reinforcement The factors which influence long-term properties of reinforcement can be divided in to physical (creep of reinforcement, fatigue due to high-cyclic loading) and environmental/chemical (especially humidity, alkalinity, etc.).
The rate how much they influence the decrease of reinforcement mechanical properties is depended on exposure time at given environment, level of acting load and temperature above all (e.g. [4] to [8]).
FRP reinforcement which is properly designed has to ensure the sufficient durability by its composition (by fibres and matrix) and to minimize the impact of particular aggressive factors.
This process can be the key factor for assessment of mechanical damage and subsequent prediction of the residual strength and service life of FRP material.

By analyzing factors affecting the accuracy of boring process on the precision boring machine, the article aims at putting forward a method of improving the accuracy of boring process by means of installing polymer elastic shock absorbers on unilateral boring tools.
However, many factors should be researched before unilateral cutting tools are used widely in the precision boring process[2]. 2.
Analysis of Factors Influencing Boring Process Accuracy Factors affecting boring process accuracy cover mechanical vibration, wear of unilateral cutting tools, mechanical deformation and thermal deformation of the process system[3].
In the similar situations, adopted methods should be a top priority.Change effects of factors above can make a positive impact on boring.
—elastic property coefficient of shock absorber —constant radial force weight and radial variable force wight exerted on supporting side guiding components.

The sorption which affects the volumetric strain is taken into consideration and the pore pressure is also been studied as a key factor for permeability and other relative parameters.
Fig.1 Schematic of bidisperse coal pore structure showing macro- and micropores containing gas in free and adsorbed[4]. 1.1 Mechanical equations for dual-porosity model Mechanical equilibrium of the solid phase is governed by the balance of linear momentum (1) The relationship between strain and displacement can be expressed as (2) For the physical process of gas flow in coal seam, taking gas sorption or desorption induced strain into account, we get Navier type equation[10] (3) For the dual-porosity model, if we use the cubic model consisting of several cubes put together, to represent coal（See Fig.2）, the mechanical properties of coal are affected by the fracture.
From the results of the volumetric strain, it can be seen that the matrix swelling which may be induced by adsorption or desorption is the dominant of all the factors. 5.
,chemistry may also important factors which affect the permeability and should not be ignored in the future work.
CO2 storage and gas diffusivity properties of coals from Sydney Basin, Australia.

Numerous approaches have been used to improve the mechanical properties of the Co-Cr-Mo alloy [1, 2].
The elimination of casting defects by thermo-mechanical treatment supplies a means of improving the mechanical properties of the alloys; significant improvements are obtained by hot isostatic pressing (HIP) of cast alloys.
Thus it is important subject to reveal the mechanical properties of the Co-Cr-Mo-C alloys without Ni as a function of C contents.
These mechanical properties are greatly improved in forged samples.
Alternative factors, however, affecting the wear properties, such as phase stability, difference in crystal structure and so forth, have to be considered to reveal the relevant mechanisms of the wear.

The specific characteristics of FIMEC are: 1- the high simplicity of the apparatus; 2- the possibility to get information about the local material properties on a scale large enough to include many grains (data represent bulk characteristics and are not influenced by those factors which dramatically affect micro- and nano-indentation tests); 3- the large versatility in industrial applications such as the control of welding quality, 4- the on-line monitoring of forging or extrusion processes etc..
Recently, FIMEC was also employed to measure the mechanical properties of human dentine [9].
The main characteristics of the FIMEC test are: 1- small material volume involved in each test; 2- simplicity of instrumentation and data processing; 3- non destructive examination; 4- determination of the main mechanical properties of the material; 5- possibility to determine the local properties of mechanical parts of complex geometry, 6- possibility to investigate the specific mechanical properties of molten zone and heat affected zone of welded joints.
This method permits to draw up a pre-normative to use FIMEC for determining the mechanical properties.
Originally, it was realized for investigating the mechanical properties of irradiated materials, however later it has been successfully used in other fields.