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Problem Statement WPC manufacturers and consumer product designers need a better understanding of the mechanical properties of the composite and environmental effects on these properties [26,27].
Research is ongoing on the WPCs to improve their physical and mechanical properties [28], rheological properties [29], durability and morphology [30,31].
There are many factors affecting the stability of the extrusion process and the quality of the extruded products.
Hwang, Water absorption behavior and mechanical properties of lignocellulosic filler-polyolefin biocomposites, Compos.
Rowell, Renewable agricultural fibres as reinforcing fillers in plastics: mechanical properties of kenaf fibre–polypropylene composites, Ind.

Various factors affecting the shear strength of UPSFRCB, such as steel fiber, prestress and shear-span to depth ratio were analyzed.
Tab. 1: Mixing proportions of concrete (1m3) Group Volume ratio of steel fiber Cement (kg) Water (kg) Sand (kg) Gravel (kg) Steel fiber (kg) Admixture (kg) Sand ratio W/C A 1.0% 455 200 990 914 78 2.05 52% 0.44 B 0% 410 180 726 1184 0 2.05 38% 0.44 Tab. 2: Size, material properties, test results of shear strength of test beams Beam No. b×h×h0 (mm) Shear span ratio φf (%) lf /df ffcu or fcu (MPa) NP1 (kN) Vfu / Vu (kN) A-1.5-1 150×300×265 1.5 1.0 50 40.2 142.3 200.0 A-1.5-2 150×300×265 1.5 1.0 50 40.2 178.4 213.5 A-2.0-1 150×300×265 2.0 1.0 50 40.2 145.7 161.5 A-2.0-2 150×300×265 2.0 1.0 50 40.2 141.8 167.0 B-1.5-1 150×300×265 1.5 0 0 40.0 146.1 174.0 B-1.5-2 150×300×265 1.5 0 0 40.0 148.8 161.5 B-2.0-1 150×300×265 2.0 0 0 40.0 145.3 138.5 B-2.0-2 150×300×265 2.0 0 0 40.0 153.4 154.5 (Where φf , lf and df are volume ratio, length and equivalent diameter of steel fiber respectively .)
The influence factors of shear capacity on diagonal section include prestress, shear span ratio, steel fiber, stirrups and so on.
Fiber reinforced concrete and bonding properties of existing concrete, Beijing: Science Press, 2008.
Mechanical properties of prestressed steel fiber reinforced concrete simple- supported beam [D], Kunming: Kunming University of Science and Technology, 2002

Since high levels of strains and strain rates accompanied by high temperatures characterize the deformation process in machining, the material properties at these extreme conditions are needed.
The behaviour of the material at elevated temperature needs to be characterized as sufficient heat is generated during the machining process of alloy which would ultimately affect the mechanical response of the workpiece.
The properties and dimensions of the materials used in the experiments and in finite element simulations are presented in Tables 1-3.
Other possible factors, responsible for minor deviations of the simulation results from the experimental data, are the character of (dynamic) friction between the workpiece and the pressure bars, longitudinal wave dispersion in the pressure bars, radial inertia in the workpiece, and impedance mismatch of the bars with the specimen.”
Kolsky: An investigation of the mechanical properties of materials at very high rates of loading.

For most of these applications, the ceramic materials need to fulfill specific requirements regarding their microstructure, porosity, permeability and mechanical properties [13-14].
To tailor the properties for each application it is necessary to control the factors affecting the sintering process such as the initial particle characteristics, the microstructure, the additives and the processing technique [15].
Kitouni, Effect of TiO2 additions on densification and mechanical properties of new mulltifunction resistant porcelains using economic raw materials, Ceram.
Mohajerani, Characterisation of fired-clay bricks incorporating biosolids and the effect of heating rate on properties of bricks, Const.
Gencel, Effect of olive mill waste addition on the properties of porous fired clay bricks using Taguchi method, J.

Principal component analysis is used to identify four major factors of coal gangue applications in road construction.Put forward 5 urgent problems to be solved and give a few corresponding suggestions.
It also brings about economic, environmental social benefits.[6] Material properties Road materia experiments were conducted on coal gangue which piled up the life of 10 years, the data obtained are as follows(The following values for the mean test multiple samples,see Table1): Table1 Coal gangue various properties and numerical data Material properties Obtained numerical data Description Density 2.44 g/cm3 Grain size distribution Well graded particles Easy to obtain large density, with low compressibility and high strength Crushing value 29.1% <30%, indicated that’s easy to be crushed, after rolling surface is smooth and dense Slake durability index 96.25% Index is higher, the resistance of softening and disintegration is better Expansivity Particles below 0.5mm 18% All are less than 40%,showed that it is non expansive Particles below 5mm 27% Particles above 5mm 32.1% original sample 26% Liquid limit index 31.06% <50%，meet the requirements Plastic limit index
Find the crucial influencing factors Four crucial factors can be summarized from general factors by Principal component analysis(PCA) in order to reveal the crucial influencing factors of coal gangue application development in road engineering in China.On the basis of collecting and analyzing relevant literature and data, also consulted experts,Table2 lists 22 general influencing factors of coal gangue application development in road engineering.
(see Table2 ) Questionnaire survey combines with software SPSS elicited 4 major influencing factors from following 22 general factors, specifically as follows: - Government support (including C8,C9,C10,C11）; - Research, development and promotion of technology (including C4,C5,C6,C7,C17,C18,C19); - Quality of professionals (including C12,C13); - The level of supply and demand (including C1,C2,C3,C14,C15,C16,C20,C21,C22).
Their technical level affects the overall engineering quality.

In fact, their low density and excellent oxidation resistance and high temperature mechanical properties give them a good potentiality for such demanding applications.
Because of the strong texture that is developed during cast and wrought processing, mechanical properties were affected by their anisotropy and reliability, thus making difficult to ensure the minimum property requirements that are expected from end-users.
Tensile, creep and fatigue tests were performed using a variety of microstructures to achieve an optimum balance of properties.
The effect of relevant structural factors, such as powder particle size, chemistry, heat treatment conditions was quantitatively analyzed for different powder heats.
Although deformation and fracture mechanisms have already been widely investigated [1-6], there is still a lack of investigations of structural defects such as porosity and inclusions that may considerably affect the mechanical behaviour.

Abrasion results in the conjugating clearance of the parts increasing, which affects the machine precision, and shorten serving life of the machine.
Ion nitrocarburizing technics may enhance obviously the friction reduction, wear resistance and scuffing resistance properties of the substance by preparing the ion nitrocarburized layer on the surface of the part[5-9].
The friction and wear properties were investigated on a SRV–4 friction and wear tester.
The friction factors were real time noted by random software.
The above analyses show that at different temperature the friction factors of ion nitrocarburized layer is always less than that of the plain surface, and especially at 150 ˚C the friction factor of ion nitrocarburized layer reduces about 36% than that of the plain surface, which explains that at higher temperature ion nitrocarburized layer may greatly improve the friction reduction property of the substrate.

Concrete is a multi-phase material and many factors can affect its performance, such as water content, shape and grade of aggregate.
Experimental research on mechanical behavior of self-compacting rock-fill concrete.
Chinese Journal of Rock Mechanics and Engineering,2007,vol.26 Supp.1: 3231-3236(in Chinese) [5]HUANG Mian-song, ZHOU Hu,AN Xue-hui, JIN Feng.A Pilot Study on Integrated Properties of Rock-Filled Concrete. 
An experimental research on the fluidity and mechanical properties of high-strength lightweight self-compacting concrete.
The effect of mineral admixtures on mechanical properties, chloride ion permeability and impermeability of self-compacting concrete.

According to the purpose of this paper, the first method is used to study the dynamic properties of original coarse materials by dynamic triaxial test.
Therefore, the paper studied the size effect of dynamic properties of coarse materials based on the PFC.
Effects of material properties on granular flow in soil using DEM simulation[J].
Research on contact surface properties of dam material by PFC2D[J].
Dynamic properties of sandy and gravelly soils:[D].

Titanium and its alloys are currently used for applications where corrosion protect properties are necessary, to high performance structures where high ratio between resistance and weight is needed, or at high temperatures.
Although titanium alloys costs are about 10-15 times more than stainless steel and aluminum, their extraordinary properties recommend their use when application performance is more important than its cost [2].
The chemical composition and mechanical properties are shown in Table 1 and Table 2.
· At the welding favorable regimes, mechanical properties obtained are characterized by good homogeneity.
· To optimize the welding process is necessary to correlate all the factors that can influence the quality of the welded joint: geometry and dimensions of the welding tool, rotation speed of the tool, welding speed, depth of penetration of the pin into the sheet placed beneath, use shielding gas