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Design of Steam Heated drying line- Finned tubes Wenjin Kang 1, a, Deqi Peng 1,b 1 Xiangtan University Mechanical Engineering College,Hunan,411105, China a79488485@qq.com, b penghuaike@163.com Key words:Steam Heating Model, Steam drying and Finned tubes.
Fig.4 Fin thickness and fin height to affect the heat transfer unit volume The impact of convective heat transfer coefficient of the outer tube shown in Figure 5.
b. on the optimal geometry of the finned tube is analyzed to obtain the optimal relation between the fin height and other factors.
Fan.Thermodynamic Properties of Water and Steam chart [M] Beijing: China Electric Power Press, 1997.
Mechanical Design Handbook Beijing: Mechanical Industry Press, 2010.

In the current investigations, a 2-D finite element iterative method has been developed to analyze the critical stress intensity factors locally along the crack front.
To characterize the elastic mismatch of the bimaterial, the two Dundurs’ parameters and are introduced according to (3) whereand are the Young’s modulus, Poisson’s ratio of the film while subscript ( )s refers to properties of the substrate.
The factorhas the dimensions as that of classical stress intensity factors.
The fracture criterion applied in the present investigation was formulated in [3] as (7) The stress intensity factors and varies along the crack front, andare factors that range between 0 and 1 adjusting the relative contribution of Modes II and III to the fracture criterion.
Comparison of stress intensity factors estimated from 2-D and 3-D FEM models for straight-sided crack front for a crack length to thickness of the film ratio.

The results show that the ultrasonic treatment reduces the stress concentration factor by improving the geometry of the toe of weld’ area.
It often makes some welding structure premature failure for fatigue, especially some key structures worst affected by dynamic load.
JG590 steel primary chemical composition (mass%):0.15C, 1.45Mn, 0.34Si, 0.037Nb, 0.074V, 0.010S, 0.022P, and its mechanical properties: Rp0.2=455MPa, Rm=610MPa, A5=21%, Akv(-5˚C)=141J, Akv(-20˚C)=83J.
It is an ideal welding method to improve the fatigue properties of welded joints.
(Mechanical Industry Press, China 1995)(In Chinese) [2] Gurney T R.

Design and Experiment Study on a New Type of Lubrication Simulation System for Thrust-Ball Bearing in Confined Space Feng Li1,2,a*, Feng Guo2,b, Guangyuan Liu2,c and Zhang Gang1,d 1College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China 2College of Mechanical Engineering, Qingdao Technological University, Qingdao 266033, China alifnsd@163.com,lifnsd@qust.edu.cn, bmech_edu@126.com, cfrichard@163.com, dzhgqust@163.com Keywords: Elastohydrodynamic, Confined gap, Film thickness, Bearing, Interference Abstract.
Unconfined space is widely used in EHL formulas for to evaluate film thickness, which is related to operating conditions and material properties.
The predicted life of rolling bearings was examined by studying the effect of measured roughness variations on the adjustment factor.
Acknowledgements This research was supported by National Natural Science Foundation of China (No. 51605238), University Science and technology project of Shandong Province(J16LB07), Qingdao original innovation program basic research for application project(Study on tribology properties of novel artificial joint materials,17-1-1-92-jch), Special Fund for Postdoctoral Innovative Project of Shandong Province (No.201203029).
Evans, Factors Affecting Surface Roughness Measurement Results, and the Impact on Predicted Life of Elastohydrodynamic Lubricated Rolling-Element Bearings.

The mechanical properties of the sheet are described in table 1.
Table 1 Mechanical property of SGARC 440 sheet Young`s modulus Tensile strength Yield Strength Poisson’s Ratio SGARC 440 0.207MPa 440MPa 250~360MPa 0.28 The simulation of the flexible roll forming was modeled using the commercial finite software DEFORM, and springback analysis was conducted using Solid works.
It is a common phenomenon in the sheet metal forming process and directly affects the dimensional accuracy of the stamping.
Therefore, systematic study of factors that influence springback can greatly impact product quality and production efficiency.
Archives of Civil and Mechanical Engineering 8, 31-38 [3] JuanLiao, XinXue, Myoung-GyuLee, Frederic Barlat, Jose Gracio.

As a result, when the sintered temperature is about 1000°C and the addition of m-ZrO2 reaches 20wt%, superior main phases are HA and t-ZrO2, which improves the combination of mechanical and biological properties.
The use of synthetic HA is, however, limited to low load bearing applications due to its inferior mechanical properties (especially fracture toughness) compared to cortical bone [1-3].
Hence, many attempts have been made to improve the mechanical properties through the incorporation of ceramic second phases, such as ZrO2 [4], Al2O3 [5], and TiO2 [6].
The addition of ZrO2 in the form of particles [7-9] to HA matrix has drawn much attention due to its biocompatibility coupled with the tendency to enhance the mechanical properties of HA [10-12].
On the contrary, when the addition of yttria-stabilized m-ZrO2 is excessive, biological properties of composites are weaken.

In addition, there are other factors such as load, test duration, temperature, and humidity that affect wear mechanisms and wear resistance [6, 7].
Table 1: Aluminium ER 5356 material properties.
Table 5: The properties of 5W-40 synthetic engine oil Properties Total Base Number (TBN) 11.28 mg KOH/g Flash point 217 ◦C Viscosity @100 ◦C 14.2 Viscosity @40 ◦C 84 Viscosity Index 175 3.
Bambach, “A Study on The Mechanical Properties Of Hybrid Parts Manufactured By Forging And Wire Arc Additive Manufacturing,” Procedia Manuf., vol. 47,2020, pp. 1141–1148
Chandra, “Mechanical properties of wire and arc additive manufactured component deposited by a CNC controlled GMAW,” Mater.

Tensile residual stress in friction stir welded (FSW) Aluminum alloy joints is well known to be detrimental to fatigue resistance properties of joints imperiled to dynamic loading.
The residual stress is measured for the FSW as-welded and high frequency mechanical impact/pneumatic impact treatment (HFMI/PIT)-treated conditions.
Large number of investigations has been carried out to study this phenomenon and its effect on the mechanical characteristics of these FSW components.
Lower heat input was concurred as the prime factor for lesser residual stresses.
Berhan “Model development for mechanical properties and weld quality class of friction stir welding using multi- objective Taguchi method and response surface methodology”, Journal of Mechanical Science and Technology 29 (6) (2015) 2323~2331 [8] Optimization of HFMI/PIT Parameters with Simultaneous Multiple Response Consideration using Multi-Objective Taguchi Method for Fatigue Life Enhancement of Friction Stir Welding, Proceedings of 68th IIW International Conference 2015, Helsinki, Finland

The purpose of carrying out two-dimensional numerical simulation includes: ①{TTP}9312 deformation of the initial and secondary support caused by the extraction in different depth. ②{TTP}9313 distribution and value of stress of the initial and secondary support caused by the extraction in different depth. ③{TTP}9314 analyze the security of tunnel structure in operation and clarify whether to allow further mining below the tunnel. ④{TTP}9315 put out the treatment play on the basis of mechanical properties.
The displacement and stress of the marble rock and silicalite rock sections far away from the coal seam is almost not affected by the extraction.
Only those sections (carbonaceous shale rock and siliceous shale rock) near the coal seam are obviously affected by the extraction.
If the radial construction joints of the structure are reinforced through adding steel bar, the scope of the area affected by the gob will be enlarged, and the uneven settlement decrease.
Considering the various factors, scheme of intermittent reinforcement at radial construction joints, small-scale and high intensity reinforcement is designed for Wusongshan Tunnel, with a 50cm raise of the roof of tunnel.

Study on Shear Properties of Rock Structural Plane by Grouting Reinforcement Yijiang Zong a, Lijun Han b, Guilei Han c State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221008, China azongyijiang@126.com, bhanlj@cumt.edu.cn, changuilei@163.com Keywords: Rock Structural Plane, Shear Strength, Mechanical Properties, Grouting Reinforcement, JRC－JCS Mode Abstract.
So the study of mechanical properties of structural plane is of great theoretical and engineering application value.
But the study of the mechanical properties of structural plane after grouting seldom reports so far.
This shear rheometer can be used to study rock long-term deformation and strength index under shear stress, can also be used for the measurement of mechanical properties of rock under quick shear.
In engineering practice, grouting can improve RS of the cracked rock mass, providing a larger safety factor.