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Based on the fuzzy clustering analysis factors affecting the degree of difficulty of coal seam water infusion in practical engineering have been screened out and the model of it also has been founded in the test.
Factors affecting the degree of difficulty of coal seam water infusion The degree of difficulty of coal seam water infusion is also the degree of difficulty of infiltrating coal seam that water can easy get into or out of coal’s cracks and porosities.
The two main factors affecting the degree of difficulty of coal seam water infusion are geological conditions where the coal lays and its physical and mechanical properties [4].
It’s an important parameter reflecting coal seam physical and mechanical properties.
(1) Select main factors affecting the difficulty of coal water injection as the description of maternal sample index in each maternal sample.

The mechanical properties were measured in compressive and tensile deformation modes.
Introduction Combing the advantages of both the matrix and the reinforcement, metal matrix composites (MMCs) can exhibit many excellent properties, such as high specific stiffness and specific strength, good dimensional stability, high damping capacity, and good elevated temperature creep properties [1-6].
The results on SiC which is usually used as the reinforcement in the pure magnesium and commercial-grade magnesium alloys, however, show limited success in improving the overall mechanical properties, especially the strength [1-5].
The combination of nickel foam with AZ91 magnesium alloy will be expected to have good damping capacity and mechanical properties.
The mechanical properties were measured in compressive and tensile deformation modes.

In the paper, organic lotion and flaky zinc are used to upgrade the properties through modifying their filler and film.
Owing to the poor mechanical properties of water-borne inorganic zinc-rich coatings, in practical applications, the composite material composed of silicate solution and organic lotions can remedy the defects on mechanical properties and improve the corrosion resistance and durability.
Result and conclusion Physical properties.
In theory, in order to ensure the electrochemical properties of the coatings, it was necessary to add enough zinc powder [10].
Xiong, Preparation and Properties of Inorganic Flake Zinc-rich Coatings[J] Journal of Beijing University of Chemical Technology, 2007,S2

Sulfate attack is one of the important factors affecting the durability of concrete.
Introduction Sulfate attack is one of the important factors affecting the durability of concrete and has been studied by many researchers, since Tuthill [1] noticed that the deteriorations of concrete structures caused by sodium sulfate attack in the 1930s.
Hartell et al [6] quantified the degree of sodium sulfate attack through the degradation of mechanical properties and found the surface disintegration caused by salt crystallization.
The length-diameter ratio was 45 and the tensile strength is greater than 825MPa.The mechanical and physical properties of corrugated steel fiber are presented in Table 3.
Its physical properties and chemical composition are listed in Table 4.

As one of the best ways to lightweight car-white-body, tailor rolling blanks (TRB) are affected by various factors when produced, such as friction, rotational speed of working rolls, adjusting speed of rollers gap, rolling force, roller stiffness, etc.
With board mechanical properties and continuous change, TRB have a better follow-up forming ability and adaptable ability.
The rolling process is mainly affected by the contact friction, rotational speed of work rolls, adjusting speed of rolls, rolling force and roll stiffness and other factors, So, in this paper, various tests were simulated by using orthogonal design method and Deform-3D software.
Flexible rolling of TRB is affected by various factors, while in this paper, numbers of tests considering friction, rotational speed of working rolls, adjusting speed of roll gap will be shown using orthogonal test, three levels each factor and the interaction of two factors are considered.
But for the interaction factors, it is not easy to observe as two columns each factor.

Orthogonal test finds that the pecking order of the influencing factors to physical properties is: fiber content > fiber length > hydroxyapatite content.
ω (f (PLA))=1% Fig. 3 SEM images of f (PLA)–HA/CS composites in the fracture surface Mechanical Properties Analysis.
As a result, neither the fiber is much too long nor short is favorable to the mechanical properties enhancement.
Fig. 6 Effect of fiber length on physical Properties of the f (PLA)-HA/CS composites Fig. 5 Effect of fiber content on physical properties of the f (PLA)-HA/CS composites Fig. 4 Effect of HA content on physical properties of the f (PLA)-HA/CS composites Influence Factor Analysis.
The pecking order of influence factors to the compositive physical properties summarized from the orthogonal experimental is: fiber quality > fiber length > hydroxyapatite quality.

This paper analyzes the unstable factors of NC WEDM machining process causes, and put forward the corresponding treatment measures.
But the increase of pulse voltage amplitude, pulse width increasing at the same time will make the workpiece surface roughness increases, the metamorphic layer thickness increase, thus affecting the surface quality of the workpiece, and even the emergence of fault arc, the broken wire.
Therefore, can choose the material is hard and good conductive properties of materials ( such as hard alloy ).
At the same time, influence of electrode wire diameter on the cutting speed is also restricted by the pulse parameters and other factors.
Conclusion Through the above analysis, factors affecting the stability of WEDM machining is in many aspects, as long as we have targeted the elimination or reduction of the above factors on the dynamic stability of the electrode wire interference, can effectively improve the WEDM-HS machining.

Compared with the other machining technology, the electrochemical machining technology has many advantages: Firstly, the machining range is wide, the electrochemical machining is out of the limit of the mechanical properties of processed material itself, and it can process all kinds of high strength, high hardness and high toughness metal material.
Influence factors on machining accuracy.
There are many factors affecting the electrochemical grinding accuracy on the surface of the work piece, such as the electrolyte system, the conductive area of cathode, the character of the material of work piece, mechanical factors and the loss of cathode tool [5].
Mechanical factors.
Secondly, passive film is the key factors in electrolytic grinding processing, which affect the surface quality and processing precision of work piece.

Introduction Influence factors of the strength of gluing joints are various.
Generally speaking, the mechanical properties of adhesive itself, the type of adherend and the treatment methods of sticking surface, size and shape of joints, the thickness of glue line, and the parameters of curing process, internal stress, test method and loading condition, all of these have considerable influence on the joint strength.
But the glue properties of wood are seriously affected by its own performance, the strength of wood is usually lower than adhesives, failures usually occur in the interface of wood and glue line or the internal part of wood.
The research achievements on the gluing performance of wood gluing joints are rare, only Joao Custodio, etc[6] have elaborated the durability influencing factors of structural gluing timber joints, Kelin Ye[7] have analyzed the gluing strength of plywood, the conclusion is that the thickness ratio is the most important influencing factors on the stress concentration coefficient.
Anisotropy and viscoelastic properties of wood make the gluing performance become more complex, the influencing principles of gluing length, specimen width and thickness of single lap joints on the maximum tensile load and tensile strength have been analyzed through the tensile experiments in this paper.

The investigation of the crystallization behavior and the mechanical and thermal properties of high-molecular-weight DM-FDCA-based polyesters, have been reported [8–12].
Table 3 The thermal properties of PEF samples for 2nd heating DSC.
Boutevin, Study of thermal and mechanical properties of virgin and recycled poly(ethylene terephthalate) before and after injection molding, Eur.
Zhu, Modification of poly(ethylene 2,5-furandicarboxylate) with 1,4-cyclohexanedimethylene: influence of composition on mechanical and barrier properties, Polymer 103 (2016) 1–8
Koros, Chain mobility, thermal, and mechanical properties of poly(ethylene furanoate) compared to poly(ethylene terephthalate), Macromolecules 47 (2014) 1383−1391