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Weight factors represent the important degree of an indicator in the indicators system, in the case of other indicators remain unchanged, the changed indicator affects the results.
Weight factors divided into two types, un-weighted weight factor and weighted weight factor.
Empirical method is that the experienced experts and scholars analyze which of the indicators are important, which of the indicators are not important with their experience in practice, to determine the weight factors of these indicators.
Journal of Mechanical Engineering. 2009, 45(12): P151-161.In Chinese
Journal of Mechanical Engineering. 2007, 43(2):P202-209.In Chinese

There are outputs in form of graph and tables accumulating information directly affecting precision aspects of manufacturing.
To predict the mechanical behaviour of FDM parts, it is critical to understand the material properties of the raw FDM process material, and the effect that FDM build parameters have on anisotropic material properties.
For better orientation of user in process of setting of suitable parameters during the preparation of printing there was algorithm elaborated which accumulates all factors and steps that lead to selection of most suitable variant.
Value of minimal thickness of single layer is conditioned by hardware properties of printer or building material.
Lower settings for density and volume of used basic and support material answer to lower strength and functional properties but present assumption for lowering the cost of 3D printing.

However, in practical application, we are mostly concerned with their mechanical properties, such as strength loss, which is directly related to the life of the building and safety [1-3].
Therefore the research of the mechanical properties of concrete after freezing and thawing cycles is chief.
It is owing to the concrete mechanical properties and internal structure all have changed after freeze-thaw cycles [4, 5].
To build reasonable concrete constitutive model and the corresponding failure criterion become the most fundamental factor that affect the accuracy of analysis results.
The equation of the curve contains the freeze-thaw performance and mechanical properties of the concrete.

For pipe thread sealing research, points dynamic and static two direction, static mainly from internal and external thread fit method, material hardness, geometry size, pipe thread bottom and top of tooth shape, packing, etc factors to hands and dynamic stress concentration is the main research, stress relaxation and high temperature oxidation on the pipe thread seal influence [1].
Due to the load properties (including load type, size, distribution, direction, etc.) kaleidoscope, relative displacement also is not only the tangential, radial, rolling and twist simple way, and may be two or more basic model compound complex movement.
Thread structure in mechanical vibration, etc.
Conclusions According to the analysis of the above situation, it is known that in consideration of the environmental gas composition, high temperature, humidity and corrosion medium, affect pipe thread micro damage and micro fatigue strength and life of the main control parameters are: contact surface and the region near the stress field, namely the size and distribution of the stress situation; in the load cycle, the contact surface of the relative sliding on the size and distribution of the momentum; contact surface friction coefficient;material properties.
In view of the above factors, in order to improve pipe thread sealing performance, the actual should be paid attention to in the application from three ways: enhance the internal and external thread type and size of the processing requirements, make its as far as possible consistent, but there are certain limit, namely in the economic and the possible conditions guarantee in a certain tolerance range; inside and outside threaded and after, through some tightening torque make internal and external thread itself materials produce certain deformation to fill a part of the clearance; between the inner and outer thread has plasticity to join the packing.

Results show that the pH of the emulsified asphalt has great impact on asphalt-aggregate adhesion by way of the effect of pH on asphalt, asphalt-aggregate adhesion is worst when asphalt emulsion at pH≈4, which is close to the isoelectric point of asphalt, the bigger the zeta potential absolute value of emulsified asphalt, the better the asphalt-aggregate adhesion property.
Introduction Cement, aggregate, emulsified asphalt are the three key materials of CA mortar utilized for slab track, the interaction between emulsified asphalt and aggregate is significant for mortar structure, because it is directly related to the homogeneity, mechanical property and durability of CA mortar.
Emulsified asphalt and aggregate produce a series of physical and chemical effects by adsorption, and the interaction is various due to the interaction is easily affected by a lot of factors[1], therefore,for the purpose of exploring the reaction mechanism and influence factors of emulsified asphalt and aggregate adhesion.
Table 1 Properties of emulsified asphalt Item Unit Index Results Appearance Shallow brown liquid, uniform, No mechanical impurities Shallow brown liquid, uniform, No mechanical impurities Particle charge ＋ ＋ Engler viscosity (25℃) 5～15 7 Sieve test (1.18mm) % <0.1 0.02 Storage stability (1d，25℃) % <1.0 0.6 Storage stability (-5℃) No coarse particles or lumps No coarse particles or lumps Cement mixed % <1.0 0.5 Evaporation residues Oil content % 58～63 61 Penetration (25℃，100g) 0.1mm 60～120 70 Solubility (Trichloroethylene) % >97 99 Ductility (5℃，5cm/min) cm >20 27 Experimental methods .
Mariotti: Study of the electrical properties of cationic bitumen emulsions by micro electrophoresis.

In addition, it also depends on the several other exogenous factors such as: work piece, tool material combination and their mechanical properties, quality and type of the machine tool used, auxiliary tooling, lubricant used, and vibrations between the work piece, machine tool and cutting tool however this other factors will not be considered in the research.
When an experiment involves two or more factors, the factors can affect the response individually or interactally.
Selecting the factors to be involved in the process and choosing the levels of these factors. 2.
[Table 2]: Factors and their levels Factors Level 1 Level 2 Level 3 A: Spindle Speed in (rev/min) 240 440 620 B: Feed in (mm/rev) 0.05 0.11 0.192 C: Depth of cut (mm) 0.5 1 1.5 Taguchi design L-27 for three levels and three factors yielded 27 experiments.
The types of chips formed are related to the material properties and cutting parameters such as speed, feed, etc.

It mainly includes: functional bionic, ideology, structural bionic bionic, material property bionic, etc.
Features: stable unity, orderly visual feeling; (2) the contrast and harmony, by emphasizing the various factors of the differences, achieve modelling is rich, have layers change unified effect.
Shell material: in the appearance of the products processing, want to reflect the material itself constitutes a product unique reasonable aesthetic factors, reflect the use of materials science and production technology advanced, get appearance modelling of form, color, quality is perfect and unified.
ABS is a kind of universal thermoplastic polymer, good rigidity, high impact strength, heat resistance, low temperature resistance, chemical resistance, good mechanical strength and electrical properties, easy processing, processing dimensional stability and surface gloss, easy to painting, coloring.
In the strength of the weak link, appropriately increase modelling beautiful stiffener, both to strengthen the intensity, and do not affect beautiful.

It has important significance to understand the heat-conducting property and simulate temperature field of geotechnical materials in northern China.
Temperature was one of important factors affecting TC.
The original loess-like soil in Changchun at different depths (0.4 m, 0.6m, 0.9m, 1.2m, 1.4m) and in different sizes in the same site were measured ,whose physical and mechanical properties were shown in Tab.1.
The basic physical properties of soil samples No Depth/m ω/% ρ/g/cm3 Ip IL C/KPa Φ/℃ α1-2/MPa-1 Es1-2/MPa-1 1 0.4 22.25 1.98 0.68 16 0.51 46.0 8.10 0.20 8.18 2 0.6 21.05 1.94 0.69 19 0.41 40.0 10.0 0.22 7.55 3 0.9 22.12 1.92 0.72 15 0.44 42.0 8.20 0.22 7.69 4 1.2 21.12 1.93 0.70 13 0.44 45.0 9.70 0.25 6.68 5 1.4 21.08 1.90 0.73 13 0.42 48.0 9.70 0.23 7.36 We divided the testing samples into three test sizes: A, laboratory test (20mm×60 mm×150 mm); B, in site (200mm×200mm×200 mm); C, in site (middle-infinite space).

The anisotropic pore morphology of lotus-type materials results in the anisotropy of their mechanical and physical properties.
The anisotropic pore morphology of lotus-type porous materials (LTPMs) results in the anisotropy of their mechanical and physical properties.
Their study supports the hypothesis that irregularity factors affect elastic and conductive properties similarly.
Relation of mechanical properties of powder metals and their porosity and the ultimate properties of porous metal-ceramic materials.
Determination of stress concentration factors in porous materials.

The formulas which allow the calculation of these factors are given in the table 3.
The higher values of these factors KH, KLL, KW, γm and β, prove the better stability.
Delbert, Mechanical properties of bulk metallic glasses, Journal of Non-Crystalline Solids. 21(1976) 343-372
Lakshmipathi, Optical properties of alkaline earth borate glasses, Int.
Singh, Gamma-ray shielding and structural properties of PbO-SiO2 glass, Nucl.