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Introduction Gear drive is one of the fundamental forms in mechanical drive.
There are many factors which influence on gear driving quality.
Equipartition property of cutting tool in tool grinding and installation of hobbing cutter is poor.
Since influence factors are various, they are interrelated and interact on each other.
The radial quality of hobbing cutter both affects the tooth profile distortion and the error of tooth profile angle.

Obtaining that the relative humidity and the days of curing influence the chemical and mechanical properties of the material.
One of the main reasons for the deterioration of the properties of composite materials is exposure to environmental factors.
The mechanical properties that were measured were the following: breaking stress, maximum and minimum stress, elastic modulus and deformation.
Average elastic energy over relative humidity vs days of curing Conclusions The comparison of the energy dissipated during the cohesive separation shows, first, that in the tests carried out the ideal time for the epoxy resin to acquire its chemical and mechanical properties is 7 days, since here the maximum value is presented, approximately 29 kJ.
Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials; D3039M‐17; ASTM International: West Conshohocken, USA, 2017

Positive effect of the magnetic field on the properties and metal structure at welding many steels is known.
Studies have confirmed the effectiveness of using external electromagnetic impact (EEI) in underwater welding to improve the weld metal mechanical properties.
Such results will lead to a nonuniform level of metal mechanical properties, an increase in local internal stresses and, accordingly, to a decrease in crack resistance, respectively.
This leads to a 2 ... 3 times increase in dislocation hardening in local areas of the structure in places of extended dislocation accumulation and, accordingly, to a nonuniform level of mechanical properties and formation of local internal stresses raisers. 4.
Bernatskyi et al., Effect of the structure on the mechanical properties and cracking resistance of welded joints of low-alloyed high-strength steels, Procedia Structural Integrity. 16 (2019) 89-96

The bonding strength and formaldehyde emission of urea-formaldehyde resin adhesives(UFRA) were influenced by some factors such as F/U molar ratio of the main resin, F/U molar ratio of modifier, melamine content, mixing ratio of main resin with modifier, which were investigated by a series of single-factor experiments.
The formaldehyde emission from the panel intended for interior applications was one of the factors causing sick building syndrome in an indoor environment.
Technological factors affecting the emission of formaldehyde from particleboards.
Effects of moisture content on formaldehyde emission and mechanical properties of plywood.
Test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels.

However, depending on the application conditions, the mechanical properties of titanium aluminides have to be tailored or improved for the temperature range above 700 °C due to microstructural instabilities, which directly affect creep properties and oxidation resistance.
MIM can deliver sound mechanical properties with good microstructural and chemical homogeneity [2–4].
The authors, however, did not characterise the mechanical properties.
In this temperature range, colony growth is more pronounced and consequently changes of the mechanical properties are expected in the final sintered specimens.
Considering that the porosity levels of the specimens prepared in this study were in the same range, the microstructure changes caused by the different heat treatments seem to be the decisive factor causing the decrease in the mechanical properties.

Introduction Modern concrete research shows that the macroscopic mechanical properties of concrete are closely related to the mesoscopic internal crack development.
In long-term research process, concrete is always consider to be a macroscopic homogeneous continuous body, and difficult to reveal the relationship between the mechanical properties and internal structure, composition of the concrete.
Bazant [1] presented a micro plane model in 1705, the model indicates that the concrete damage and relevant to crack propagation path; Mohamed and Hansen [2] considered the randomness of the aggregate distribution matrix in their model, and used the distribution crack model to describe the unit tension damage constitutive; Ma [3], Li [4] and Peng [5] used the modal presented by Mohamed to simulate the meso-level mechanical properties of roller compacted concrete, and found that the mechanical properties of uniaxial tensile, compressive and splitting tensile are more consistent with the test results.
Tang [6] used the statistical mechanics to consider inhomogeneity of concrete materials and mechanical properties, and make component materials of the mesoscopic element mechanics properties satisfy the Weibull distribution.
,Liu B., Numerical simulation of meso-level mechanical properties of roller compacted concrete,2001,06:19-22

The mechanical property of the composite was examined with hardness test.
Important factor affecting aluminium alloy characteristic is the use of Mg and Cu element, as in the research by Dons, et.al [7,8], whereas Zn will optimally increase the hardness, after a precipitation-hardening heat treatment process [9].
Based on this, in order to increase the mechanical properties in this research, Mg and Zn alloy elements are added to aluminium matrix.
The ability to withstand the penetration of projectile is influenced by the mechanical properties of aluminium matrix composite.
Regarding composite material, the volume fraction of the reinforced material affects its mechanical properties.

Solar heat is one of the main factors affecting the durability of roofing membranes, according to research and real-world experience with the deterioration of these materials over time.
Conversely, the maximum weight of CaCO360% weight percent exhibits good IR reflectance and less tribological properties.
The most widely used inorganic filler in polymer materials to lower costs and improve mechanical properties is calcium carbonate (CaCO3).
Effect of calcium carbonate on the mechanical and thermal properties of isotactic polypropylene/ethylene vinyl acetate blends.
Investigation of the influence of fillers on the properties of poly (vinyl acetate) adhesives.

As the binder percentage and sintering temperature affect the porosity and the overall mechanical strength of the sample, it is important to optimize these factors in order to be able to fabricate samples of the desired porosity and mechanical properties that fit the intended application, whilst allowing for optimal cell-material interactions. 2.
It was observed that these physical properties vary with sintering temperature and binder percentage. 3.3 Mechanical properties The mechanical properties of the 3DP titanium samples are summarized in Table 2.
Summary of the mechanical properties of the 3DP titanium, and dense 2D titanium samples.
The table compares the mechanical properties of the 3DP titanium samples with those of the dense titanium and native bone (cortical and cancellous).
Hanada, Mechanical properties of porous titanium compacts prepared by powder sintering, Scripta Materialia. 12 (2003) 1197-1202

The mechanical properties, the friction coefficient and the wear performance were then studied.
Therefore in this work, the mechanical properties, the friction coefficient and the wear performance of the frictional materials for motorcycle clutch with fly ash replacements of some original substances were studied.
The mechanical and tribological properties were compared to the original product and the composition giving minimum cost with superior or similar properties to the original product was selected to produce the prototypes which were then tested on a dynamometer.
Specimens with fly ash were found to have higher hardness up to a certain amount of fly ash replacement beyond which a decrease in the mechanical properties was found.
These wear particles were found to be very crucial and are one of the main factors affecting the value of the coefficient of frictions of the system.