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The result of the statistical correlation matrix revealed that penetration rate and bit wear rate are dominant factors affecting the prediction of specific energy having high coefficient of correlation.
A comprehensive understanding on the mechanical and physical properties of the rock is required for successful drilling operation [3].
The concept of specific energy has been introduced by Teale [4] as the energy required to excavate unit volume of rock, this can be used as an index of rock mechanical properties of rock mass.
The factors affecting specific energy when drilling blast - hole in quarries are area of drilled hole, penetration rate, rotational speed, pull down weight on the bit, depth/length of drill string, and formation properties.
Considering the simultaneous effects of various factors relating to rock materials in drilling process, test of the effect of one factor on penetrability of rock samples may be encountered with many errors as suggested by Hoseinie et al [9].

The low cyclic loading tests were applied to test the mechanical properties of three kinds of grid framework with aspect ratios 0.69, 1.1 and 2.75.
Based on the analysis of failure mode, bearing capacity, ductility, and energy dissipation capacity and so on, the factors affecting on the seismic performance of the grid frame shear wall were discussed.
The low cyclic loading tests were applied to test the mechanical properties of the wall [1, 2].
The main load-bearing element of the structure is the grid frame shear wall and the low cyclic loading tests were applied to test its mechanical properties.
The section size of the specimen and the reinforcement ratio of side column are the main factors affecting the initial stiffness of the wall.

The influence of different factors on the Stress Distribution of strip joints Zhi LI1, a, Min YOU 2, Mei-rong ZHAO1, Gang-yan LI 3 1 Mechanical Electric Engineering Department, China Three Gorges Project Corporation, 443002 2 College of Mechanical and Material Engineering, China Three Gorges University, 443002 3 College of Mechanical and electronic Engineering, Wuhan University of technology, 430070 alizhiyj@qq.com Keywords: Strip, Elastic modulus, Stress intensity factor, Crack length Abstract.
Consider the nonlinear behavior of materials, with the bilinear option to describe the isotropic hardening elastic-plastic material properties, such as Table 1 shows, the yield criterion selected VonMises yield criterion.
Loading process assuming that the adhesive and adherend material properties are unchanged.
Selection of material properties in Table 1 as the basis for the calculation in this section, when the initial crack length is L = 6mm.
According to the above analysis on the remaining carrying capacity, further studies the influence of crack length on joints, then use acrylic adhesive as the adhesive material properties shown in Table 1.

Comparison tests of needles made in abroad and domestic on chemical composition, microstruture , mechanical property and so on, the main influence factors of the wear resistance were analysed.
So the structure and properties of needles will affect the efficiency and the quality of the knitting machines.
Needles which are the main looped pieces, especially the most widely used latch needle, is faced a new challenge in mechanical properties, structural size, surface process.
Except for the hardness index, the wear resistance is also relevant to material plastic and other factors[5].
As tool steel, the size, shape and distribution of carbide have been regarded as the important factors to W-1.

The effectiveness of such interaction is determined by the current density in the weld pool, where the physical properties of the aqueous medium significantly affect the interaction of magnetic and electric fields.
As a result, one can expect an increase in the mechanical properties of the crystal [9-17].
The dislocation structure is one of the determining factors of the strength and crack resistance of the metal [24-26].
References [1] Ryzhov R.N., Kozhukhar V.A., Maksimov S.Yu. and Prilipko E.A., Application of external electromagnetic actions for improvement of mechanical properties of welds in underwater wet welding, Paton Welding Journal. 11 (2004) 49-51
Martynyuk, Influence of parameters of longitudinal magnetic field on the structure and mechanical properties of welded joints of oil and gas pipelines, Avtomaticheskaia Svarka 9 (1978) 37-41

On the basis of the model, the factor affecting rope-tube transmission performance was studied especially coefficient of kinetic friction and Elastic modulus of flexible tube.
The rope-tube mechanical model is established firstly to analyze factors affecting the transmission performance.
Fig.3 The rope-tube mechanical model Analyzing the rope-tube mechanical model, it is not difficult to find that there are many factors having effects on the transmission performance, and these factors can be divided into three classes as follow.
Among them, the steel rope is a kind of common rope, so the material properties of ordinary carbon steel are regarded as the material properties of rope.
Three types of factors affecting transmission performance were pointed out.

Table 1 lists the material mechanical properties of different zones.
Results and discussions As important mechanical affecting factors in EAC behavior, all of the local stress, plastic strain and plastic zone in the crack tip were usually used in various quantitative predicting approaches for SCC growth rate.
It indicates that stress is obviously influenced by the material properties around FB region.
And stress is obviously influenced by the material properties around FB region.
Effect of material properties around FB region on strain is smaller than that on stress.

X-ray diffraction, scanning electron microscope, energy dispersive spectrometer and Nano-indentation system were employed to characterize their microstructure morphology and mechanical properties.
Referring to the temperature history, we deemed that the surface oxidation and the solid phase transformation were the main factors which changed laser coupling efficiency.
It is known, the response of material irradiated by laser is related to its physical properties, and the physical properties are determined by microstructure.
Microstructure and mechanical properties after irradiation We tested the surface oxide layer characteristics and the overall mechanical properties.
Different laser irradiation processes will make different influences on mechanical properties of alloy steel, such as bond strength of interfaces and thickness of hard brittle layer.

Effects of Solution Temperature on Microstructure and Tensile Properties of Casting Duplex Stainless Steel Hongliang Xianga, Dong Liub, and Fushan Hec School of Mechanical Engineering of Fuzhou University, Fuzhou 350108 PR.
Austenitic grain size and morphology are the most important factors on tensile property.
When using different solution temperature, not only the morphology, size of phase could change, but also two-phase ratios and distribution of alloy elements in the phases could alter, which ultimately affect the mechanical properties [4, 5].
Austenite grain size and morphology are main factors affecting the tensile strength.
Mechanical properties of engineering materials, edited by Machinery Industry Press (2003) (In Chinese)

In this paper, influence of density on the microstructure, mechanical properties, thermal and electrical properties of recrystallized silicon carbide (RSiC) were investigated via XRD, SEM, mechanical test, thermal conductivity instrument and four-probe method, etc.
Microstructure and mechanical properties.
Figure 3 presented the temperature depend mechanical properties of the RSiC materials (2.60g×cm-3).
As for RSiC materials, two main factors such as temperature and pore would affect the thermal conductivity of it.
Guo,H.N.Xiao, Microstructure and mechanical properties of 3-D interpenetrated network structure MoSi2–RSiC composite, Ceram.