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Mechanical properties of welds are determined by chemical composition, cooling rate (technological parameters such as voltage and current) and microstructure.
The most important factor determining the weld metal properties is chemical composition [8], and the thermal history (cycles) due to the welding processes [5].
Lu, Effects of multiple normalizing processes on the microstructure and mechanical properties of low carbon steel weld metal with and without Nb, Materials and Design,35, (2012) 43-54
Haerian, Effect of copper content on the microstructure and mechanical properties of multipass MMA, low alloy steel weld metal deposits, Materials and Design, Vol.30, (2009)1902-1912
Baudin, Effect of welding on microstructure and mechanical properties of an industrial low carbon steel : Journal of Engineering, 2(7), (2010)502-506

Due to these situations, the properties and qualities of gear materials are highly affected.
So, improving the mechanical and toughness properties of the existing gear material is very vital and compulsory since these properties have a direct impact on gear fatigue failure.
These situations affect the qualities and mechanical properties of the transmission gear materials.[1, 2].
Figure 8: Influence of Ni-content on impact toughness of experimental and predicted values The fracture toughness is an essential material property that is overseen on various factors, the most significant of which is microstructure and nonmetallic inclusion size of materials.
Therefore, ANN modeling can predict accurately the mechanical and toughness properties of alloy steels.

The Mechanical Properties of FRP Fabric Steel-reinforced Concrete Columns Le ZHOU1,2,a , Xiao-chu WANG1,3,b and Jian-peng ZHANG1,3,c 1School of Architecture and Civil Engineering, Shenyang University, Shenyang, 110044, China 2Department of Civil Engineering, Tsinghua University, Beijing 100084, China 3The Key Laboratory of Geoenvironmental Engineering, Liaoning, Shenyang, 110044, China azhoule1978@126.com, bwangxiaochu@126.com, czjpsdwf@163.com Keywords: GFRP tube, steel-reinforced concrete column, intensity, bearing capacity.
The mechanical properties of FRP steel-reinforced concrete columns are discussed.
We study the constitutive relation of the concrete, based on the model and the experimental dates for the control the size of affecting parameters.
Calculation of ultimate bearing capacity of long column is built on the basis of short columns [8], in front of the short column formulas you want plus a stability factor (according to the effective length and gyration parameter reference tables).

Investigations show that, mechanical properties and engineering performance of LVL are affected by many factors such as wood species, veneer thickness and quality, processing variables, member size, in service environment and loading types [1,2,3,4,5].
And each of the factors had eleven testing levels.
So the neural network model can be used to predict the valuable mechanical properties of LVL.
But the results from the neural network model in this study show promising potential for simulating complex nonlinear function approximations between production technology factors and the mechanical properties of LVL.
It is therefore feasible to develop robust ANN models to predict mechanical properties of LVL.

In the transient analysis phase, the same time were not allowed to repeat operation, the initial conditions were defined in small increments of time will affect the transient analysis method for solving efficiency and result analysis.
Examples and Computational Analysis Physical Properties of Materials.
Stern shaft mechanical seal performance related to different ambient temperature.
Due to the station ring material of high modulus of elasticity, station ring deformation was mainly affected by temperature, and the temperature change was the same trend; and the elastic modulus of the material static ring was relatively smaller, the surface deformation in addition to affected by temperature, but also the force
In the process of loading, the parameters change rule by time adequately described the friction of mechanical face seal of thermal-mechanical effects, namely the friction heat will cause thermal deformation, thermal deformation caused by uneven contact and the contact area was reduced, thereby cause contact area to reduce and temperature rise.

Active layer’s morphologies properties are important for the optoelectronic devices.
In this paper, the morphologies properties of the carbon nanotube/polyaniline composites thin film formed by spin coating were studied by the atomic force microscopy (AFM).
But their potential application always limited by the morphology and interface properties when they used as an active layer in the device. [4].
But there are lots of factors can affact the microstructure of the film, which make the contoling of microstructure quiet difficulty, such as, the inherent Vander Waals force of the CNTs, polymer/carbon nanotubes composite’s fabrication methods, spin coating ways, solvents types, analysis method.All the factors above make the controlling over the interface and morphology of carbon nanotube/polymer composites’ thin film become complicated and difficulty[7,8].
Fig.3-1 (a) displayed island like phase separations, Fig.3-1(b) showed unconnected sharp edges phase separations formed, phase separations in Fig.3-1(c) are continuous and interconnected network. there are many factors can effect the interface and morphology of the active layer of the device, as we discussed above, but in the experiment, the solvent type, carbon nanotube physical property, the composites preparation method, and microstructure analysis method are the same, so there are only two factors, concentration of SWNTs in blended solution and spin-coating way, can change the films’ microstructure.

CNC machining centers were analyzed by the failure mode, effect and criticality analysis (FMECA) method for identifying the weakest links of a CNC machining center and obtaining that the spindle system is the primary factor that affects the reliability of CNC machining centers.
Finite Element Analysis of Spindle The most important factor that affects the reliability of machining center is the spindle system, and the impact of spindle offset and geometric accuracy exceeding is obvious.
The spindle is made of 45 steel with the following material properties: Young’s modulus E = 210000 MPa and Poisson ratio v = 0.3.
Mechanical Reliability Design.
Mechanical Engineering & Automation, Vol. 2 (2011), p. 74.

Carbon nanotube has attracted tremendous scientific and industrial interests due to its exceptional mechanical, electrical and thermal properties.
Intensive experimental and theoretical researches have been conducted on the mechanical properties of carbon nanotubes [3-7].
Lin et al. [13] investigated the mechanical properties and dynamic behaviors of carbon nanotubes with vacancies and related defects.
It is found that the introduction of atomic vacancies will greatly affect the mechanical properties of carbon nanotubes under axial compression.
Lorents, “Mechanical and thermal properties of carbon nanotubes,” Carbon, vol. 33, pp. 925-930, 1995

Possibilities of Improving the Rheological and Physical-Mechanical Properties of Polyetheretherketone Using Organophosphorus Stabilizers KHAKYASHEVA E.V.a*, SHETOV R.A.b, KHASHIROVA S.Yu.c Кh.M.
The temperature range of the study chosen by us is due to the following factors.
It also lists the properties of PEEK stabilized with 1% Hostanox “P-EPQ.
Synthesis and properties of polyetheretherketones for 3D printing.
Khashirova, Synthesis and properties of polyetheretherketones for 3d printing.

a a.nagasekhar@uq.edu.au , b c.caceres@minmet.uq.edu.au * Corresponding author: Tel: +61 7 3365 4377, fax: +61 7 3365 3888 Keywords: Magnesium-Aluminium alloys, Mechanical properties, Microstructure, High pressure die casting, Skin effect.
As a result, the casting processing and geometric parameters may have an overriding influence in the final mechanical properties [1, 2, 8].
Such a study seems warranted as HPDC is the most important route for the production of magnesium components, and a detailed understanding of the microstructure-mechanical property relationship may result in optimised alloy design.
There may be other factors involved, though, such as a reduction in the grain size, which would increase the overall strength.
Such factors must be quantified [3] in order to develop a suitable model to predict the flow strength and ductility from first principles.