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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.

However, factors such as the local yielding, high strain gradients, and three dimensional state of stress at the crack tips and finite size of the gages strongly affected the development of strain gage techniques.
Theoretically, the straight line property will break for .
The geometric parameters and material properties used in numerical examples are shown in Fig. 3.
The material properties used in numerical examples are shown in Fig. 3.
Robi, “Determination of strain gage locations for accurate measurement of the opening mode stress intensity factors’’.

The variation of material properties with temperature can be considered.
Material Models at Elevated Temperatures The numerical model takes into account the temperature-dependent thermal and mechanical properties of the materials. 3.1.
Mechanical Models The mechanical properties of steel and concrete have been take from EN1994-1-2 [28] (Fig. 4).
The mechanical properties of the steel have been considered as reversible, which means that stiffness and strength are recovered to full initial values during cooling.
Properties of Materials at High Temperatures: Concrete.

Hardening effect as a function of the content of alloying elements [12] The quality of any extruded product is a function of various factors, such as chemical composition, geometrical dimensions, appearance and regularity of the microstructure, variation of mechanical properties over the extruded length and cross section, and surface finishes [4].
There are numerous factors that affect process planning of cold extrusion such as extruded shape and size, tolerance, surface finish, component type, material and quantity to manufacture, etc. [7].
Mechanical properties of tool steel alloy.
The main factors like billet length, billet container, extrusion ratio and extrusion speed will affect metal flow and the resulting properties, structure of the section and its surface finish.
Shapes and Properties

The tremendous study report that properties of the implant that affected by its physical and chemical properties.
Metal especially SS316L stainless steel is one of the famous material among the other due to excellent corrosion resistance, easier manufactured and its adjustable mechanical properties [3,4].
This parameter is mainly affected by many factors which can be divided into two main variables controllable or uncontrollable.
The different material will generate a different response when processed by water jet cutting depend on its mechanical properties.
Shipway, Abrasive waterjet cutting of a titanium alloy: The influence of abrasive morphology and mechanical properties on workpiece grit embedment and cut quality, J.

In this study, the thermal properties of a kind of new geotextile materials, so called controlled permeable formwork (CPF), were studied.
As a new geotextile material, the properties of CPF are seldom studied so far [2].
The performance of CPF will be changed during the transportation, storage and usage due to the affection of external factors such as the change of temperature.
The change was negligible and won’t affect the normal use of the sample.
The thermal stability of CPF is very good and the change of the mechanical properties of it is negligible for general use in construction.

However, such broader applications of the monolithic TiB2 are inhibited by factors like high sintering temperature and poor toughness.
The B:M ratio affects both the electronic structure and properties.
Besides the above factors, the densification of TiB2 also depends on the purity of the starting powders.
Table 2 summarizes processing conditions, density and mechanical properties of the TiB2 ceramics.
It was also demonstrated that MoSi2 addition does not degrade mechanical, wear and oxidation properties.

It was established that composite deflocculant consisting of sodium tripolyphosphate and PCE Castament FS 20 provides the best rheological properties of the cement matrix and affects the composition of the hydration products.
Such devices linings service conditions require using refractory castables (RC) that would have high resistance to mechanical factors as well as to slags and waste gas impact.
Traditional DF have only short-term impact on the RC paste rheological properties, but using higher amounts of DF is associated with negative effect on cement hydration process and significant deterioration of physical and mechanical properties of the RC.
The influence of composite DF on physical and mechanical properties of RC was studied.
This phenomenon contributes to strength properties increment.

The investigation of surface integrity was done on this materials in terms of operating parameters like sliding speed, feed rate and depth of penetration (DOP) identifying the predominant factors among the selected parameters.
They concluded that the burnishing force was the major factor affecting the wear resistance of the surface layer of the burnished components and that there was an optimum burnishing forces, which gave the best results.
It is the methodology of ultra low temperature processing of materials to enhance their metallurgical properties to the desired level.
Mechanical properties Properties Values Tensile strength 950,00 to 250, 000 PSI Modulus of elasticity 290,000 PSI Elongation 8 to 25 % per two inches Table 3.
Table 1 and 2 shows the chemical composition and mechanical properties respectively and Table 3 shows the operating parameters used.

The belongings of carbon twine essence on tensile properties [52], Property phenomenon Young's modulus, belongings on toughness along with yield strength Affects on ductility possessions of carbon fiber extent on tensile properties of CFRP combination specimens Fracture interface interpretation once tensile annoying and flexural testing [39].
As per existing literature papers, the not large amount of research has been done in environmental conditions such as temperature, humidity, and noise factors.
And it helps to compose the main complicated and intricate composite components without compromising the mechanical and wear properties.
Bhowmik, Experimental investigations of process parameters influence on rheological behavior and dynamic mechanical properties of FDM manufactured parts, Mat.
Guymon, Modification of Mechanical Properties and Resolution of Printed Stereolithographic Objects through RAFT Agent Incorporation, Add.