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Microstructure is one of important factors which affect the contact fatigue properties and fatigue life.
In order to improve the contact fatigue properties, the gear with low hardness surface was replaced by the gear with medium hardness surface in the heavy machinery industry.
In this paper, the effect of alloying elements of the contact fatigue properties was studied. the contact fatigue properties have been studied by using three kind of steel (45, 42CrMo, 40CrNi2Mo)which were quenched and tempered to the same medium hardness (HRC37±1).
The main factors are listed in Table 3.
Devanathan: Wear, Vol. 156(1992), p. 121 [2] Shu Delin: Mechanical Properties of Materials.

Factors such as mineralogical composition, admixtures, water/binder ratio and solid particle size distribution will affect the rheological properties of injection grouts [10, 15, 16].
During the grouting process, the particles in the grout tend to settle gradually thereby affecting the stability of the grout.
The mechanical properties of injection grouts are related to reinforcement effect of grouting intervention in stone masonry walls.
Perraki, Effect of synthesis parameters on the mechanical properties of fly ash-based geopolymers, Colloids Surf., A 301 (2007) 246-254
Williams, Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes, , J.

As shown in Figure 4, different machine parameters control the strength of the part in FDM, and layer orientation affects the mechanical properties of the printed part [16].
The mechanical and melting properties of PLA specimens are shown in Table 1.
A case study of 3D printed PLA and its mechanical properties.
Mechanical properties of bio-absorbable PLA/PGA fiber-reinforced composites.
Mechanical properties of PLA-graphene filament for FDM 3D printing.

A STUDY ON FATIGUE CRACK PROPAGATION PROPERTIES USING THE X-RAY DIFFRACTION METHOD Md.
The tension test achieved according to ASTM E8 regulation, and Table 2 is showing mechanical properties of material.
Also, if striation spacing is longer, it means that predicted shot fatigue life and the striation spacing depended on repeated stress level, frequency, stress concentration factors and shot peening velocity.
Finally, we think that fatigue life increase is the factors and among various factors, can know merit of shot peening effect on the surface.
This cause is superior to do site mechanical properties of matter and is because crack propagation rate was gone fast.

The front billet temperature is found to be the most significant factor affecting the variation.
Introduction The mechanical and geometrical properties of extruded aluminum sections depend on a number of parameters in the extrusion process, including flow and temperature evolution in the container and die.
Simulation models, which achieve sufficiently accurate quantification of the flow conditions in the container and die, can be very useful tools when understanding how to control problematic effects on shape and mechanical properties.
Three level factorial design with three factors, front billet temperature (ºC), billet taper (ºC/billet length), and ram speed (mm/sec) was implemented.
There is also a direct relationship between the temperature and the material properties of the extruded section.

Considering the difference between specimens and RD2 axle of C64A freight car, the extrapolated probabilistic fatigue S-N curves of LZ50 axle steel, which include the long life regime of material, are adjusted by introducing a probabilistic fatigue affecting factor, Kaffect.
Material of the axle is LZ50 axle steel and its basic fatigue properties have been obtained in previous work [1-3].
A probabilistic fatigue affecting factor, Kaffect, is adopted to describe the difference between material specimens and realistic axles [5].
Thus, fatigue affecting factor with arbitrary survival probability, P, and confidence, C, can be defined as Kaffect,P-C.
Mechanical Eng., Vol. 40, 9 (2004), p. 48 [4] B.

The Taguchi L9 orthogonal array and optimization approach was applied on three levels of three critical factors, namely rotational speed, transverse speed and tool tilt angle.
Factors Level 1 Level 2 Level 3 Rotational speed (rpm) 900 1000 1100 Transverse speed (mm/min) 90 100 110 Tilt angle 3˚ 4˚ 5˚ Results and discussion Fig. 1 shows the welded product.
Using the Taguchi method, the mean effect and Signal-to-Noise ratio (S/N) of each variations were calculated to analyse the influence of factors on the output (response).
Cavaliere, Friction Stir Welding of Al Alloys: Analysis of Processing Parameters Affecting Mechanical Behavior, Procedia CIRP 11 (2013) 139–144
Panella, Effect of welding parameters on mechanical and microstructural properties of AA6082 joints produced by friction stir welding, J.

Parametric Study of Nozzle Connections in Ellipsoidal Head Pressure Vessel Haszeme Abu Kasim1, a and Wahyu Kuntjoro1, b 1Faculty of Mechanical Engineering Universiti Teknologi Mara, 40450 Shah Alam, Selangor, Malaysia ahaszeme@morehorizon.com, bwkuntjoro@salam.uitm.edu.my Keywords: Finite Element Analysis (FEA), Ellipsoidal head, Radial nozzle connections, Stress concentration factor (SCF), Non-dimensional geometrical parameters.
All the results analysis was presented as graphs of non-dimensional parameters against stress concentration factor (SCF) for each load case applied.
The materials of the structure component and mechanical properties used for this analysis are given in Table 1 and Table 2.
Nozzle 6 Flange SA 105 Table 2: Materials properties Mechanical Properties of Materials SA 516 GR 70 SA 105 Density, ρ [ kg/m] 8030 8030 Poison’s ratio, ν 0.30 0.30 Elastic Modulus, E [ Gpa ] 210 179.2 Tensile Ultimate Strength [ Mpa ] 485 485 Tensile Yield Strength [ Mpa ] 260 250 Boundary Condition & Loads Applied.
Fig. 4: Results of parametric analysis (a) Load Case 1, (b) Load Case 2, (c) Load Case 3, (d) Load Case 4 and (e) Load Case 5 In general, these graphs show that the size and thickness of nozzle affect the Stress Concentration Factor (SCF).

Several Mg-4Al-4La/Ce alloys were developed and their microstructure and mechanical properties were evaluated.
Considering the formation of fine-grain magnesium alloys, several factors as follows should be involved in this work.
For this phenomenon the following factors may be considered.
Tensile properties.
The authors also would like to thank Foxconn group for the test of the mechanical properties.

The obtained results showed that the depleted area around primary MnS particles affects significantly the distribution of strain-induced MnS particles, and the involved parameters were discussed.
Its excellent magnetic property comes from the sharp Goss texture developed by secondary recrystallization process.
In Fe-3%Si steel, the solute depleted area around MnS particles precipitated earlier will inevitably affect the distribution of MnS.
Compression test was carried out on Gleeble-1500 thermo-mechanical system in argon atmosphere.
In addition to the size of solute depleted area, the shape of solute depleted area also affects the distribution of strain-induced MnS particles.