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Using the Shigley method, the prediction of fatigue limit from calculated stress concentration factors was also examined.
Se=kakbkckdkeS'e (1) Notations: S'e = endurance limit of a rotating beam specimen ka = surface effect factor kb = size effect factor kc = reliability factor kd = temperature factor ke = 1/kf 4.2 Fatigue Life Prediction of Bolt and Comparison Shigley's method was used to predict the fatigue limit of M16 high-strength bolts.
The strain-stress curve shown in Fig.4 was used as property information.
Table 3 shows the aforementioned effect factors.
R., 1989, "Mechanical Engineering Design," McGraw-Hill, pp. 234~298

This material is remote from the weld and has not been deformed, although it may have experienced a thermal cycle from the weld, but it has not been affected by the heat in terms of microstructure or mechanical properties as shown in Fig. 10a
It is possible to correlate these welded regions with variations in mechanical properties.
The same dependence of tensile shear strength on tool holding time and tool rotation speeds can be realized in terms of both microstructure factors , i.e. the (dn) and (tu) sizes.
Nogi, “Effect of Tool Shape on Mechanical Properties and Microstructure of Friction Stir Welded Aluminum Alloys”, Materials Science and Engineering, PP. 25-31, (2006)
Qu, “The Influence of Pin Geometry on Bonding and Mechanical Properties in Friction Stir Weld 2014 Al Alloy”, Materials Letters, PP. 2948-2952, (2005)

., R & D Center, Çayırova, Gebze, Kocaeli, Turkey Keywords: Hydroxyapatite, sintering, compacts, mechanical properties Abstract.
Hydroxyapatite (HA) is a particularly attractive material for bone and tooth implants because of its chemical and crystallographic properties, which closely resemble those of bone and tooth minerals.
The present study was conducted to examine the influence of sintering temperature on the mechanical properties of the pure HA compacts.
Contrary to the above case, the factor of the sintering temperature has a significant effect on microhardness (F = 18.03 p-value = 0.009).
Summary Density determination, microhardness and compression tests were carried out for synthetic HA to see the main changes in the mechanical properties and it is planned to use these data as reference measurements for future sintered HA studies.

The residual stress not only affects the performance of corrosion, cracking and fatigue strength, but also has a huge impact on the physical and mechanical properties of materials, which can greatly break the strength of the structure.
Mechanical methods contain stress releasing and stress superposing methods.
The mechanical property of deposited metal is with Rel=470MPa.
The linear relationship between residual stress and strain increment relates with the steel material, surface condition, ball diameter, the strain gage size, distance between strain gage and ball center, impact energy, static pressure and other factors.
The calibrating plate should full anneal to erase the internal stress, and the material property change should be avoided in this process.

In order to secure the uniformity and to reduce the scattering of torque coefficient value, which is a decisive factor in the quality of high tension bolt nut and washer sets, effort is required from the manufacturer to standardize manufacturing process and to continuously improve the quality.
This test focuses on the manufacturing of high quality, high tension bolts, by understanding experimentally how the size change in the manufacturing process affects the torque coefficient value and axial force, and applying it to manufacturing.
Although, it is shown that their effect is less than that of lubrication of nuts, mechanical properties, etc; they are, nevertheless, the primary factors of scattering.
It was expected that the scattering of notch size affected the axial force significantly; but, it was proved that the fracture torque of notch part, which has direct relation with real joining axial force, has no correlation with notch size.

PLA and hemp fiber biocomposites have high mechanical properties, which allow reducing the amount of materials in the product.
Also, low-grade fiber composites show remarkable mechanical properties.
The hemp variety has no particular impact on the mechanical properties of the LLDPE composite, but the length of the fibers significantly affects them.
Secondly, PLA has excellent mechanical properties similar to polystyrene properties.
The arithmetic average estimates of the physical-mechanical properties of the biocomposite samples are summarized in the Table 2.

Published literature is rich with investigations of mechanical properties of composites, but fewer publications are focused on thermal properties.
The fibers distribution determines the mechanical properties of the composite materials [4].
Published literature is rich with investigations of mechanical properties of composites, but fewer publications are focused on thermal properties.
It is believed that interfacial regions are formed around the particles and affect to a great extent the dielectric properties of nanocomposites.
Other factors may overshadow the potential advantages that these layers can offer to the thermal conductivity of nanocomposites.

Bond strength between concrete being a substrate and material placed on it depend on the properties of both materials and on physico-chemical phenomena affecting the bond [6].
Regarding to the substrate the following properties are the most important: mechanical strength, roughness, porosity, moisture content, contaminations.
Table 3: Materials properties and samples size, where φ – diameter, h – high.
Chmielewska, Uwarunkowania adhezji w złączach budowlanych/Factors affecting adhesion in building joints, Cement Wapno Beton, 2, 2005, pp. 74-85
Chmielewska, Adhesion strength and other mechanical properties of SBR modified concrete, International Journal of Concrete Structures and Materials, V.2 no.1 (2008), p. 3

The ductility of Mg-based alloys is strongly affected by two main factors.
This affected a significant increase in the yield point of the alloy.
The specimens with the fine grain size of 2.2µm showed some variability in properties, having tensile strength measurements of between 300 and 325MPa.
It is clear that the processing carried out here has moved the properties of the as-received AZ31 plate into a new property space on this plot.
This does not significantly affect the ductility

Introduction Titanium alloy has high strength, high temperature mechanical properties good corrosion resistance and so on.
On titanium alloy processing technology and method research which is attracting much attention [1] .However, due to its certain physical and chemical properties, their machinability is poor.
WEDM technology is a non-contact machining method, high precision machining, not affected by macroscopic force, not limited by the physical properties such as strength, hardness.
The model shows the main factors affect the surface roughness of material in WEDM is electrical parameters.
Pulse current is the biggest influence factors.