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Hence, the dedicated integral micro-porous structures and brittle mechanical properties of GDL and MEA cannot be preserved.
Consequently, the mass, heat, and charge transfer properties are changed [3].
Recently, Kusoglu [8, 9] found the material properties in PEMFC are temperature dependents.
Material Properties.
Table 2 lists the main material properties of components in the FEM model [5].

For instance, graphite and diamond are both carbon -with completely different physical and chemical properties.
Carbon nanotubes (CNTs) are materials that extend in one dimension and have outstanding mechanical and electronic properties, leading to the evolution of nano-devices [3, 4, 5].
Woods, Mechanical properties of defective single wall carbon nanotubes, J.
Roche, Electronic and transport properties of nanotubes, Rev.
Xiaotuo, Structure factors of carbon nanotubes on the thermal conductivity of carbon nanotube/epoxy composites, AIP ADVANCES. 8 (2018) 035107 [33] S.

In addition, if the value of strength and the friction coefficient are factors that proportionally affect the wear degree, then the value of the modulus of the polymer material plays the role of a trigger, which, when this value decreases, turns on more destructive mechanisms of wear [8-9].
Depending on the particle size (or their surface area), the magnitude of the filling effect on the functional properties of polymers varies.
These fillers act on the factors that directly affect the abrasive wear degree in different directions: the decrease in the coefficient of friction between the polymer material and the abrasive surface leads to the decrease in the wear degree, but decrease in the strength of the material leads to the increase in the mentioned degree).
Volkova, Influence of nature and concentration of filler on properties of polyurethane composites, used in water environment, Persp.
Sheng-Kang, Hydrogen-bonding properties of segmented polyether poly (urethane urea) copolymer, Macromolecules 30 (1997) 4405-4409

Very significant feature of spinning is ability to produce components with high mechanical properties and high quality of surface layers.
Very significant feature of spinning is ability to produce components with high mechanical properties and smooth surface finish [3, 4].
Fig. 2 CNC roller paths Two variables, i.e. spindle speed and feed rate were considered as the experimental input factors.
In order to assure the statistical properties the runs were made in randomised order.
Metal spun and deep drawn part´s surface layers properties evaluation.

Warpage problem was categorized in aesthetic properties in injection molding process [1].
Properties for both types of material are shown in Table 1 and 2 respectively.
Table 1: Physical and Mechanical Properties of ABS Properties Value Specific heat, Cp (J/kgoC) 1464.7 Thermal conductivity, K (w/moC) 0.178 Melt density, (g/cm3) 0.96 Elastic modulus, E (MPa) 2.24 x 103 Poisson's ratio, υ 0.392 Table 2: Properties of P20 Mold Steel Properties Value Mold density, (g/cm3) 7.8 Mold specific heat (J/kgoC) 460 Thermal conductivity, K (w/moC) 29 Elastic modulus, E (MPa) 2.0e5 Poisson's ratio, υ 0.33 Mold coefficient of thermal expansion (1/C) 1.2e-5 Injection Molding Setup.
The best set of parameters can be determined by selecting the significant factors that affects to warpage in Table 7.
From Table 9 and 10, the results of maximum percentage contribution (P) show the most significant factor that affect the warpage value.

The relations among the tribochemical effect factors are as follows: the microstrain and the effective temperature factor increase with the decrease of the crystallite size.
Since 1980's, people have recognized MoSi2 as a kind of potential high-temperature structure materials, whose preparation of mechanical alloying (MA) has caused extensive concern [3].
So as to affect the micro and the macro structure of materials [3,4].
Grain size, microstrain and effective temperature factor of powder were selected as the tribochemical effect factors.
The value of Beff is decided by the intrinsic properties of the material, such as bonding, crystal structure, density and surface roughness etc.

IWP admixture properties are shown in table 3.
Table 7 shows the results obtained from experimental work, mechanical properties given in this table include tensile strength, compressive strength, and flexural strength.
Mechanical properties for all mixes in the study.
Mahdi, Mechanical properties of waste aggregate steel fiber reinforced concrete modified with waterproof admixture, international journal of civil engineering and technology, November 2018, vol.9, issue11, pp. 948-959
Mezher, Some Mechanical Properties of waste marble aggregate concrete reinforced with local steel pins as steel fibers, international journal of civil engineering and technology, January 2019, vol.10, issue 1, pp. 105-111.

Spider silks have excellent mechanical properties, which can even compare with some high-performance synthetic materials.
Although as reported, the impressive mechanical properties are closely related to the primary amino acid sequence, the conformation that molecular chains form is also an important determinant.
Introduction The study of spider silk has been focused in the polymer material area during the recent 20 years with its remarkable mechanical properties, expected to be utilized as the perfect material of bulletproof helmets, ballistic protective clothing and other industry supplies[1,2].
Besides the three factors, alkali metal ions also have an influence on the conformational transition which will be discussed in the further research.
Weber, et al, Silk properties determined by gland-specific expression of a spider fibroin gene family, Science 272(1996) 112-115

Microstructure and Properties of TiAlN/AlN Composite Film Deposited on Cam's Profile by Ion Beam Sputtering Technique Peiquan Guoa, Shouren Wangb and Huanyong Cuic School of Mechanical Engineering, University of Jinan, Jinan, China, 250022 a oss_guopq@ujn.edu.cn, bme_wangsr@ujn.edu.cn, cost_cuihy@ujn.edu.cn Keywords: TiAlN/AlN film; ion sputtering deposition; microstructure; micro-hardness; cam Abstract.
The microstructure and properties of TiAlN/AlN composite film deposited on the profile surface of cam (made of 45 steel) by ion beam sputtering deposition were discussed.
X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM) analysis has been used to characterize film's microstructure and properties.
The aim of this work is to examine the morphological, mechanical, corrosion resistance and wear resistance properties of them.
The substrate bias is one of the most important factors for determining micro-hardness value.

For simplicity, the model is based on sliding distance as input variable, while other factors like temperature, load, surface conditions are treated as constant.
Along with the chemical and physical properties of the materials in contact, wear is dependent on a combination of intrinsic and extrinsic factors, which makes it a dynamic response of the mechanical system in consideration [2].
Due to the difficulty in dealing with large number of variables affecting the wear phenomenon and the incomplete nature of the wear theory, experimental verification of the model is an integral part of any wear modeling effort [2].
Mechanical wear is classified in four major modes: Adhesive, Abrasive, Erosive and Fatigue [5].
Thus, the accuracy of the wear model can be improved if combined effects of geometry and material properties are added.