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But porous metals have outstanding physical and mechanical properties which providing them double natures of function and structure, and are applied in many fields of science and technology.
Furthermore, these behaviors are connected with laser mode, laser input energy and powder properties.
Seen as figure 3, the processing factors include laser power, scan speed, scan space and layer thickness which will interact with powder size, shape, size distribution and their thermal properties.
Therefore, it is important to focus on the interactions of pretext factors and find internal laws from these combinations of factors.
Figure 3 Interaction factors in SLM Figure 4 Interaction results of factors on the forming of pores As for research methods, there can be three items according to time and logic(figure 5).

The mechanical properties will change dramatically with the microstructure evolution under different cooling procedures [7].
The corresponding mechanical properties of diverse microstructures were investigated to reveal the effect of these influence factors.
The relationship of microstructure and mechanical properties.
Ghosh, Evolution of phases and mechanical properties of thermomechanically processed ultra high strength steels, Trans.
Wang, Effect of cooling procedure on microstructures and mechanical properties of hot rolled Nb-Ti bainitic high strength steel, Mater.

The total error of product life can be found as the vector sum of the error factors.
By affecting a particular factor all product life’s can affect cycle, which in turn requires leaving the quantified uncertainties.
As a finishing smoothing was applied , resulting in increased diffusion properties of the surface layer of the part.
Fig. 4 Diagram eqsperimental position 1 – Insert 3-jaw; 2 – the center of the tailstock of the machine; 3 – electrode; 4 – detail coated; 5 – power; 6 – ammeter; 7 – High frequency current generator; n – speed; Summary The life cycle of items affected by many factors, under configured technological process combination of these factors, namely the set of life cycles of these factors will respond Weibull-Gnedenko.
Muhin, Forming special surface properties of aircraft parts: Schoolbook, UFA, UAI, 1986, pp. 83.

Recent researches [5] have pointed out that the fracture toughness is also depended on microstructure factors.
Results Mechanical property.
The mechanical properties of the drill pipe steel were summarized in Table 2, Figure 1 and 2 respectively.
Fig. 7 Particle Number of Three Shape Precipitations in Different Temper Temperature Discussions The relationship between mechanical properties and microstructure is complicated for this new high strength-toughness drill pipe steel.
However, the coarse M3C carbide is an important factor affecting toughness.

According to the geological and mining conditions, the scale, shape and regularity of the potential crack areas in the coal goafs, separated overburden strata, and the influencing factors which affect the deformation foundation of architecture and stability are studied.
For these factors such as different mining period, different mining methods, and complex geological structure, the ground of the subsidence areas are not uniformly stable, and many building foundations in these areas are always cracked and damaged, which cause great threatens to the safety of people’s life and properties, and restrict the local economic development[1,2].
According to mining faces, roadways and the production of the mine, the faults and wrinkles are two factors that affect the geological structures; especially the fault structures are more complex, so the fault condition is one of the important factors to evaluate the stability of the overburden strata.
Analysis and evaluation of the building foundation’s stability The factors that affect the stability of the building foundation in coal mining subsidence area are the new and old gobs, residual coal pillar, fractured geological structures in coal field and axis fold etc.
The factors that affect the stability of the building foundation in coal mining subsidence area are the new and old gobs, residual coal pillar, fractured geological structures in coal field and axis fold etc.

Mechanical properties of pressure vessel steel with surface defects are measured by indentation, and corresponding finite element models are established.
Instrumented indentation method has widely used in the measurement of mechanical properties of microscale materials since the significance achievement was developed by Oliver WC and Pharr GM [4,5].
Many studies focus on the corresponding relation between shape factors of load-displacement curves and elastic-plastic properties of materials.
It was generally supposed that elastic contact stiffness S, loading curvature C and ratio of residual depth to max depth hr/hm are independent shape factors [11].
Based on the numerical model, further researches on the relation of equivalent mechanical properties and surface defects condition are available.

Ingredients of friction composite were considered as factors or parameters and % volume for each factor was varied at 2 levels.
When the average effect of the ingredient increases due to the changing of factor from Level 1 to Level 2, it means that the ingredient affect strengthening of flexural properties of composite.
On the other hand, when the average effect of the ingredient decreases due to the changing of factor from Level 1 to Level 2, it means that the ingredient affect weakening of flexural properties of composite.
Glass fiber and cast iron chip affect on strengthening of flexural properties of composite.
Conversely, NBR rubber affects on weakening of flexural properties of composite.

In summary, the different mixing efficiencies of INS and KND type mixers affect the EPDM/PP TPVs and their properties.
The morphological and mechanical properties and crosslink density of TPVs were evaluated.
Mechanical properties were examined according to ASTM D412 using a universal testing machine (tensi TECH, Tech Pro Inc, USA).
Mechanical properties and crosslink density of the EPDM/PP TPVs Properties INS mixer KND mixer Tensile strength (MPa) 8.3 ± 0.1 6.7 ± 0.2 Elongation at break (%) 289.5 ± 5.9 331.8 ± 12.1 100% Modulus (MPa) 4.5 ± 0.1 3.4 ± 0.0 200% Modulus (MPa) 6.5 ± 0.0 4.8 ± 0.0 Stress-strain curve area (MJ/m3) 1537.1 ± 44.9 1409.9 ± 102.3 Tension set (%) 10.5 ± 0.6 12.6 ± 2.2 Crosslink density (mole/m3) 267.4 ± 5.5 168.8 ± 3.4 Mechanical Properties and Crosslink Density The effects of the intermeshing mixers on mechanical properties of the EPDM/PP TPVs are summarized in Table 4.
Finely distributed vulcanized rubber phase in the thermoplastic matrix tends to give improved mechanical properties [7].

Determination of rheological properties of titanium alloys under conditions of high strain rates Andrey V.
Heating of the tool's cutting edge during the cutting process causes a change in the structure and mechanical properties of the material, and at certain temperature it intensifies the adhesion and diffusion phenomena.
The temperature of cutting depends on the cutting mode, conditions and on the mechanical and thermal properties of the workpiece material and tool.
Determination of temperature and resistance dependencies of titanium alloy [4] and a comparison of the data with their mechanical and thermal properties and the properties of the tool material, allow to use cutting temperature, as one of the criteria of workability of new materials.
Mechanical and thermal properties of the alloy Ti – 6AL – 4V are given in Table 2 [3].

Hence, achieving the desired hole quality is of great importance for the functional behaviour of the mechanical parts.
Experiments are performed under different magnetic drilling conditions of spindle speed, feed rate and drill diameter on CNC drilling machine using three levels of factors.
A procedure has been adopted to assess and optimize the chosen factors by the use of Box Behnken design to analyse the effects of different parameters.
Nouari M. et al. [3] provided necessary information about the main factors affecting the hole quality i.e. cutting speed, temperature, feed rate, geometrical parameters as well as the influence of the cutting conditions and the temperature on the tool life in drilling.
The mathematical expression of relationship of the surface roughness parameter with the three variables (feed rate, speed, drill diameter) is shown below as in terms of actual factors.