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Introduction Arch structures are widely used in civil engineering, mechanical engineering and aerospace Engineering because of its good mechanical properties, which was extensively studied by both domestic and foreign researchers [1-6].
Therefore, the circular arch considering geometrical imperfection is involved in this paper, and various factors including the geometrical imperfection and the elastic support that affecting the in-plane buckling will be studied by using the variation principle [7].
Imperfections affect the buckling in a certain extent; elastic supports play an important role in the snap-through buckling, while bifurcation buckling is not sensitive to elastic support.
The effects of the geometrical imperfections on the mechanical properties of arch structures [D].

Complex Nano-Scale Structures for Unprecedented Properties in Steels Francisca G.
The desire for such materials in the engineering context comes from the expectation of novel mechanical properties, particularly the stress that can safely be tolerated in service.
Bainite plate thickness and retained austenite content are shown to be important factors in controlling the yield strength.
Fatigue performance was slightly improved over 100Cr6 for one of the two industrially produced materials, but factors controlling fatigue resistance require further investigation [7].
However, its effect on the fatigue strength remains unclear, partially because it cannot be isolated from other microstructural features that are also likely to be affecting the mechanical behavior [4].

It was observed that Type 2 has higher mechanical properties and dimensional stability than Type 1. 1.
INTRODUCTION Fiber reinforced composites have better excellent mechanical properties than metals or Al alloys from the viewpoints of stiffness, anti-corrosion, and loss of weight.
The weight of real structure is one of the important factors of all materials used in transportation facilities.
However, when these composite materials are exposed to very severe condition, the mechanical properties (stiffness, strength, glass deformation, etc…) and the physical properties (dimension, etc…) will be changed.
Table 2 shows comparison of mechanical properties of each panel.

The study of fatigue crack growth shape under mode I constant amplitude loading Wenfeng Tu 1,a, Zengliang Gao2,b, Zhaoji Hu 1,c 1 College of Environmental and Chemical Engineering, Nanchang University, Nanchang, China 2 College of mechanical Engineering, Zhejiang University of Technology, Hangzhou, China aemail:tuwenfeng@ncu.edu.cn, bemail: zlgao@zjut.edu.cn, cemail: zhjhu2005@163.com Keywords: Crack shape; Stress intensity factor; Through-thickness crack; Finite element analysis.
A data and numerical analysis of crack shape were conducted and the stress intensity factors (SIF) along crack front were calculated.
The 3-D nature of cracks resulted in that stress intensity factor (SIF) was related to the crack front and crack shape.
Small changes of crack shape brought great variations of SIF, so the crack growth rate and fatigue life were affected greatly [3].
Experimental procedure 16MnR steel adopted in the paper was used to study the multi-axial fatigue in an earlier publication [4] where the microstructures, chemical compositions, and the basic mechanical properties were summarized.

As a new carbon material, carbon nanotubes have excellent mechanical properties and special tubular structure, CNTs can be used as a reinforce body to improve the hardness and tribological performance.
However, as the development of modern technologies (magnetic, ultrasonic, laser, pulse, etc.), some properties of the coating can not meet these demand.
Successful co-deposition and properties of electroless composite coatings are dependent on various factors including particles size and their concentration in the bath, etc.
They posses exceptional mechanical, electrical and thermal properties, together with a high geometrical aspect ratio (ratio between length and diameter)[9].
Summary As a new carbon material, carbon nanotubes have excellent mechanical properties and special tubular structure, CNTs can be used as a reinforce body to improve the hardness and tribological performance.

A significant factor is the dilatation of sand grains.
Sands from related deposits may differ in their properties contrary to expectations, and understanding their behavior can be crucial for a specific application.
The aim of this experiment is to define the differences in properties of silica sands from two mining locations situated close to each other.
It is generally assumed that they are from the same deposit of silica sand, and therefore, the extracted sands should exhibit similar quality and properties.
Zheng, Evaluation of Microstructural and Mechanical Properties of Silica-Enriched Oil Well Cement Pastes in Steam Injection Wells, Available at SSRN 4048736

It is found that the new model can accurately characterize the hyperelastic mechanical properties of the experimental specimens in different deformation states.
However, due to the complexity of rubber characteristics, nonlinear material and geometric properties bring great difficulties to the research, so finite element analysis (FEA) has become the main means of rubber mechanical analysis.
Filled rubber is very sensitive to the temperature and strain state, and the manufacturing process and composition of rubber also have a significant impact on the mechanical properties of rubber [1].
The main factor affecting the accuracy of this method is the edge effect of the free edge (the left and right sides that are not constrained in the plane tension) of the rubber sheet, and the strain state is not uniform in this region.
Liu, Determination of the mechanical properties of the different layers of blood vessels in vivo, Proceedings of the National Academy of Sciences, 92 (1995) 2169-2173

A series of factors linked to the mechanical system can significantly shift the electrical impedance and the real resonant frequency of the vibrating system.
Introduction The polymeric composites gained substantial acclaim in recent decades and these new materials with particular beneficial properties, are consistently being developed to suit modern applications.
As a result, the quality of these products is adversely affected especially by the reduction of the load-carrying capacity of laminated parts and the overall composites structure.
A series of factors linked to the mechanical system can significantly shift the electrical impedance and the real resonant frequency of the vibrating system with significance consequences for the functional efficiency of the device.
The resonant frequency of the assembly, free of mechanical constrains was 38.994 kHz and it changed at 39.100 kHz when the oscillating system is fixed in the frame.

Introduction The track geometry is not perfect, as it is affected by a set of deviations mainly due to the building imperfections, track exploitation, changes in the infrastructure coming from the action of the environment factors or the ground movements [1].
This is approximated via a theoretical curve, in line with ORE B176 [11], considered representative for the average statistic properties of the European railways.
Thus, the corresponding reduction of the value of the response factors and is visible along with the increase of zc.
The results derived from the numerical simulations have pointed out at a number of basic properties of the wheelset vertical vibrations in correlation with the velocity, track damping and its quality.
[9] Suarez, B., Felez, J., Lozano, J.A., Rodriguez, P., Influence of the track quality and of the properties of the wheel–rail rolling contact on vehicle dynamics, Vehicle System Dynamics. 51, 2 (2013) 301-320

The advantage of such two-phase alloys consists of their high mechanical properties while keeping an excellent ductility.
This means that machining process plays a very important role in the mechanical properties of alloys by affecting their microstructure.
Tables 3 present a summary of mechanical and thermal properties of the alloy.
Table 3 Mechanical and thermal properties of Ti6Al4V.
Table 4 Mechanical and thermal properties of chemical components of the cutting tool.