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Numerical Analysis on Mechanical Property of Bolted Joint Lihua Yang1,2,a , Zhi Li1,b and Lie Yu1,c 1State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China 2School of Aerospace, Xi’an Jiaotong University, 28 West Xianning Road, Xi’an 710049, Shaanxi, China ayanglihua_2@126.com, b312629258 @qq.com, cyulie@mail.xjtu.edu.cn Keywords: bolted joint, self-loosing, stress and strain, clamping force Abstract.
Its fatigue and self-loosing will affect the safety of the system.
In this paper, the finite element contact models are built to analyze the mechanical property of bolted joint numerically.
The friction coefficients of contact surfaces are all set to 0.09 and the normal contact stiffness factor is 0.1.
ASME Journal of Mechanical Design, Vol.129, No.1, p. 218-226. (2007)

In the whole process of making, transportation, storage, construction and working, the properties of Geosynthetics will be affected by many factors.
It makes the geosynthetics discolorate, strength, elongation and other mechanical properties deteriorate gradually.
The factors affecting its aging can be divided into two parts: internal ones—the type of polymer, material composition ratio and additives; external ones—the applicated environment, in which, light, oxygen, heat have great effect to aging.
It is because there were other factors apart from UV decreased the mechanical properties of samples slowly in the underwater environment, such as oxygen dissolved in water, the water and sediment keeping washing out, stress and biological activities etc.
Conclusions (1) The durability of geosynthetics is affected by many factors such as metarial aging, creep, mechanical damage, corrosion by acid or alkali solution and biological activities and its damage usually is the combined result of several factors

The pressing methods and sequences significantly affected the properties of the MBC.
The mechanical properties of mycelium-based composites could be enhanced by both hot and cold pressing methods [12].
The results suggested that temperature and pressure are critical factors in achieving significant shrinkage through pressing methods.
This finding contributed to improved mechanical properties.
Wosten, Fabrication factors influencing mechanical, moisture- and water-related properties of mycelium-based composites, Mater.

The ultimate bearing capacity was deduced based on the unified strength theory, with some influencing factors analyzed as well.
In order to improve the mechanical properties of concrete filled square steel tube, set PBL shear connectors into the inner wall of the steel tube.
It can prevent local buckling of the steel siding, improve the mechanical properties of steel columns.
Influencing factors is the friction angle of concrete, it ranges between 30°to 50°.
Study of influence factors and formula for the bearing capacity of PBL shear connectors [J].

Introduction Analyzing plastic deformation and failure processes of metal materials, the following factors are usually discussed: material structure, deformation velocity, temperature, etc.
However, the impact of surface layers on deformation process is taken into account very seldom, though they very often influence the mechanical properties, mechanisms of plastic deformation and failure [1-3].
This is beneficial from technological as well as economical point of view since a cheaper metal is used, whereas mechanical properties remain good [2].
Fatigue resistance is one of the most important mechanical properties.
The fractures of the samples have such specific properties.

Therefore, in order to fully understand the material properties of concrete in different strain rate, it is a important and urgent task to establish a dynamic constitutive equation of concrete correctly.
Strain rate(s-1) 10-5 10-4 10-3 10-2 1 14 16 17 20 2 14 16 18 The formula of fit curve of Fig.3 is expressed as following: (1) 2.2 Dynamic elastic properties of concrete The elastic modulus of concrete reflects the stress-strain properties of concrete.
Conclusions Based on the experiment of typical dynamic mechanical behavior of concrete under uniaxial stress, the affecting factors of dynamic loading rate on the strength and elastic modulus are analyzed in this paper.
Experimental and Theoretical Study On the Dynamic Properties of Concrete [D].
Micromechanics: Overall Properties of Heterogeneous Materials [M].

Its physical and mechanical properties such as lightweight, high strength, corrosion resistance, and thermal and electrical conductivity make it a suitable material choice for these applications.
Introduction Manufacturing microchannels on aluminum alloys is an area of growing interest due to the unique properties of aluminum and its alloys for chemical, mechanical, and electronic cooling applications [1],[2].
The mechanical properties elongation at break points 12.0-25.0% and tensile strength is 290 MPa.
Additionally, laser power can influence the degree of thermal damage to the surrounding material, further affecting the microchannel width.
The dependence of the channel depth on these factors can be attributed to the physics of laser-material interaction during microchannel fabrication.

Particularly, corrosion fatigue strength of coil spring depends on many factors including mechanical and environmental properties.
Its chemical composition and mechanical properties are illustrated in Table 1 and Table 2.
Table 1 Chemical composition of material (wt. %) C Si Mn P S Cr 0.55 1.36 0.7 0.01 0.002 0.68 Table 2 Mechanical properties of specimen Yield strength (MPa) Tensile Strength (MPa) Elongation (%) 1,176 1,764 9.4 9.5 mm9.5 mm9.5 mm9.5 mm 80.5 mm80.5 mm80.5 mm80.5 mm 90 mm90 mm90 mm90 mm X Y X,Y,Z = 0 at 3/4 pitch Diameter of coil Section of wire Total No. of coil : 7 No. of active coil : 5.5 spring constant : 1.98Kgf/mm 261 mm Displacement = D Fig. 1 FEA model of coil spring Analysis Results.
Showing the maximum residual stress by multiple impacts was lower than one by single impact, it is assumed due to the fact that interaction between the shot balls impacting to the surface considerably affected final residual stress generation
In order to affect sufficiently corrosive environment to corrosion fatigue characteristics of coil spring, coating of spring wire was partially removed, and periodically sprayed the solution to coil spring.

Mechanical properties results indicated that a chromites mold under low vacuum condition has the optimal value.
It was caused that changing of thermophysical properties of mould affected changing of heat transfer process between casting and mold.
The mechanical properties of ADC12 were determined by hardness and tensile strength using the ARK 751/250 and the ZDM 50/91 (Germany) machines, respectively.
Mold and position of thermocouple in mold Results and Discussion Mechanical Properties The mechanical properties of ADC12 which poured in quartz/chromite mold with atmospheric and low vacuum conditions are presented in Fig. 2 and Fig. 3, respectively.
The mechanical properties of ADC12 in vacuum are also higher than that of atmospheric condition.

The barrier properties, mechanicals properties and microbial penetration were evaluated.
Mechanical Properties.
Table 1 shows the mechanical and barrier properties of the films.
The addition of hydrophobic phytotherapic caused a significant increase in all mechanical properties.
Optical and mechanical properties of thermoplastic polymers, In Robertson, G.L.