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Comparative Study of the Mechanical Properties of Spot Welded Joints Marwah Sabah Fakhri1,a, Ahmed Al-Mukhtar2,b*,Ibtihal A.
Hence, the mechanical properties and their strength are presented.
This study focuses on the mechanical properties of spot welded joints, especially shear strength, and fatigue strength, which are the most important properties of spot welds.
Mechanical Properties of Spot Welded Joints The standard tensile shear and transverse tensile tests described in American Welding Society AWS [25].
Tensile shear testing is most widely used to evaluate spot weldability by determining the mechanical properties.

In the extrusion process two main factors are considered.
Aluminum is used for its prominent properties of lightness (3 times lighter than steel), erosive endurance and ease of formability.
Materials and Methods Although finite element analyses of aluminum as extrudate have been frequently reported, a study of the properties of an extrusion die and a pocket material with FEM has rarely been performed.
Boundary conditions, loads and material properties were defined before the analyses were run, Four (4) parameters that influence the extrusion process were studied.
Table 3: Best factors and their max.von Mises Stresses Order Parameters Best factor Max. von Mises Stress [Gpa] Safety factor 1.

The Effects of Different Defects on Vibration Properties of Single-walled Carbon Nanotubes Lijie Chen1,a, Qi Zhao1,b and Zunqun Gong1,c 1School of Physics and Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China achenlijie@xmu.edu.cn, bzhaoqi19850827@163.com, cgzqhnn@163.com Keywords: Single-walled carbon nanotubes; Atom vacancy defects; Stone-Wales defects; Vibration properties; Finite element method Abstract.
The computational results show that the length, the diameter and the defect position of SWCNTs are three important factors affecting the vibration properties of SWCNTs.
Introduction Ever since the discovery of carbon nanotubes (CNTs) in 1991 [1], more and more studies are focused on their excellent mechanical properties.
Due to the restrictions of manufacturing, different defects, such as atom vacancy and Stone-Wales defects, exist inevitably in the CNTs, which affect their mechanical behaviors.
The wall thickness is 0.34 nm and the material properties are referred to [8].

Study on Chemical Mechanical Polishing Removal Mechanism of Monocrystalline Silicon Hongwei Du1, a, Yanni Chen1, b 1 College of Mechanical and Electrical Engineering, Qingdao Agricultural University, China adhwfair@163.com, b609215407@qq.com Keywords: Monocrystalline Silicon; Chemical Mechanical Polishing; Erosion; Scratch; Material removal Abstract.
The polishing pressure is an important factor to obtain ultra-smooth surface without damage.
Monocrystalline ultra-precision machining process often leads to its surface and sub-surface phase transition, cracks and dislocations and other chemical damage and physical properties of materials change and other mechanical damage, which affects the normal use[3-5].
The polishing pressure is an important factor to obtain ultra-smooth surface without damage.
Study on Chemical Mechanical Polishing of Silicon Wafer.

The most common aim of experiments it is determine how certain factors affect the observed variable, often called the response.
Generally speaking, the resulting coating microhardness is affected by mainly physical factors accompanied by a chemical influence in their mutual relations.
It is also clear from the Fig. 3 that the temperature of the electrolyte alone does not affect the observed parameter, but its importance is in interaction with other factors.
Apart from corrosion resistance and thermal insulation properties improvement, surface microhardness increases, too.
Fecsu, Analysis of selected properties of PVD films, Scientific Bulletins of Rzeszów University of Technology.

Rock deformation and support pressure depend not only on the in-situ stress and rock properties, but also on the other factors, as the own attributes of support and mounting arrangements.
The mechanical properties of soft rock engineering depend on the clay mineral composed of soft rock.
The clay minerals are the main factors to affect the mechanical properties of soft rock while the variability of the clay mineral content is one of the factors leading to the variability of the physical and mechanical properties of soft rock.
Due to the critical load and the critical depth of softening are closely related to depth, density and layer thickness of rock, there also exists randomness in softening critical depth.Factors affecting the stability of surrounding rock of underground soft rock engineering are greater randomness and uncertainty than the general rock engineering.
The balance of the tunnel depends on the physical and mechanical properties of surrounding rock and the size of initial stress.

From the result, the appearance of grain boundary significantly alters the resonance properties of Cu nanowires.
Gu, A fundamental numerical and theoretical study for the vibrational properties of nanowires.
Olsson, P.A., Transverse resonant properties of strained gold nanowires.
Zhan, H., Numerical Characterization of the Mechanical Properties of Metal Nanowires 2013, Queensland University of Technology
Polatoglou, Vibrational and mechanical properties of Si/Ge nanowires as resonators: A molecular dynamics study. physica status solidi (a) 211(2) (2014). 267-276

Some influencing factors on damage will be discussed within the framework of continuum damage Mechanics(CDM).
The innercasing is made of GX12CrMoWVNbN alloy steel and its material properties are listed in Tab.1.
Mechanical properties and damage evolution parameters Mechanical properties of the innercasing Damage evolution parameters Temperature(℃) 100 200 300 400 500 600 Temperature(℃) 540 565 600 Conductivity (W/m K) 38.9 38.1 33.9 33.1 30.1 26.4 B(1030) 59.980 3.169 0.176 Specific heat(J/kg℃) 487.4 507.6 565.2 622.8 669.6 716.4 n 11.737 11.557 11.357 Expansion(10-6/℃) 11.49 12.03 12.43 12.80 13.23 13.32 σUTS(MPa) 555 530 500 Density(kg/m3) 7800 7780 7750 7720 7690 7660 α 11.24 Elastic modulus(109Pa) 215 205 198 189 181 168 U(KJ/mol.K) 380.8 Poisson’s ratio 0.281 0.281 0.284 0.294 0.275 0.298 Besides, the stresses in the innercasing are mainly induced by the uneven temperature distribution and the steam pressure differential during the turbine operation.
The main influencing factors on Damage.
Degradation of mechanical properties of cast Cr-Mo-V and Cr-W-V steam turbine casing after long-term service at elevated temperatures[J], Part I: tensile properties, brittle fracture strength and Charpy impact properties, Int.

The new low-alloy cast steel has the ideal metallographic microstructure, proper physical and mechanical properties.
For a brake disc, both the temperature and thermal stress are main factors of the brake disc design criterion, which directly affects on the brake disc life.
Different materials will have different physical and mechanical properties.
Mechanical property indexes at room temperature Tensile strength (MPa) Yield strength (MPa) Hardness (HRC) Elongation (%) ≥ 1020 ≥ 950 32～37 4～12 2.2 Determining the Chemical Composition Chemical composition will not only affect the material mechanical properties, but also be one of the major factors that determine the kind of metallographical feature and the result of heat treatment at the same time.
The mechanical properties of the cast steel can be achieved with the similar level as those of forged steel.

Therefore it is significant for the understanding of the tensile performance of the woven membrane materials, which is a main factor for the evaluation of the mechanical properties of the materials.
However, in this method, due to the existence of the sewn yarns, the tensile properties of the membrane materials obtained have been affected significantly.
Factors in the cruciform-shape bi-axial tensile tests Although the cruciform-shape bi-axial tensile tests have been applied mostly, there is no international standard about that.
Due to the inelastic property and the long expected service time of the flexible membrane materials, it is necessary to grasp the mechanical property after the application of the materials on the light weight structure for a long time.
The factors, such as the configurations and dimensions of the cruciform sample, the loading modes of the bi-axial stresses and the means for the measuring of the strains, which would affect the mechanical properties have been analyzed in detail.