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Online since: July 2012
Authors: Wieslaw Jerzy Staszewski, Sofia Pavlopoulou, Costas Soutis
Moreover it provides a significant design advantage due to the fact that it does not change the aerodynamic properties of the structure and the disturbances are eliminated [8, 9].
On line damage monitoring Although through the last years much attention has been given to the analysis of the mechanical behaviour (properties and durability) of scarf repairs little research has been focused on the sensing behaviour with the aim of developing a self-sensing repair system.
First of all the measurements accuracy might be affected by various factors such as sub-pixel optimization algorithm, subset shape function, sub-pixel intensity interpolation scheme, image noise and camera lens distortion.
All these properties are undesirable in SHM applications since they make the recorded data very difficult to analyse and interpret.
In addition there are several factors that can lead to lower strength such as the discontinuities introduced during the manufacturing process.
Online since: August 2007
Authors: Young Seog Lee, S.I. Kim, D.W. Kim, Y.C. Yang, D.J. Paik, Shi Hoon Choi
The formability response of material is changed due to increased frictional conditions at the sheet/tool(die) interface and the mechanical properties of substrate.
To enhance the formability of the GA steel sheet, the previous works [1-5] focused on controlling several factors such as grain size, crystallographic orientation, temperature, coating thickness and phase composition of the intermetallic layer.
The mechanical properties are evaluated by nano-indentation and deformed specimens were investigated using SEM/EDS analysis.
The failure behavior is related with the volume fraction and morphology of intermetallic compounds and mechanical properties in coating layer.
Improved powdering of the low alloying steel might be attributed to the soundness of interface and the morphology of brittle phases of δ(FeZn10) and Γ(Fe3Zn10) related with mechanical properties of coating layer.
Online since: December 2014
Authors: Yang Chao
Mechanical strength, 2012, 31 (53): 432-436
Analysis of the several cracking Ni electrode multilayer ceramic capacitors factors [J].
Nanjing: mechanical manufacturing and automation, 2010 (3): 112-113
The elastic properties of anisotropic Kelvin open cell foam model [J].
Research on the transparent metallic mesh electromagnetic shielding layer material preparation and properties [J].
Online since: February 2011
Authors: Guo Dong You, Lu Xu, Tie Xiong Su, Xiao Jie Li, Kun Li
The Research on The Structure Parameters To Deformation of The 150 Diesel Engine Cylinder Under Thermo-mechanical Coupling LI Kun 1a,SU Tie-xiong 1b, You Guo-dong1 , Xu Lu1 , Li Xiao-jie 1 1 Institute of Mechanical and Electrical Engineering, North University of China, Taiyuan 030051 a fendou1981@tom.com, b sutiexiong@nuc.edu.cn Keywords: Internal combustion engine; Cylinder liner; Deformation; Thermo-mechanical Coupling.
Using a series of evaluation criteria such as maximum, minimum radius, light leakage rate to analyze the influence of the main structural parameters on the cylinder liner deformation in the coupling effect of Thermal stress and mechanical stress.
Introduction The internal combustion engine combustion chamber are formed by the cylinder head, piston, cylinder liner and piston rings .The deformation of the cylinder liner could damage the piston rings seal , and this further affects the engine's economy, power and emissions characteristics[1-5].The control of the cylinder liner’s deformation can reduced radial clearance between piston and cylinder bore, which can reduce the impact of the piston on the cylinder liner and reduce the vibration and noise of the engine[6] .Taking the 12V150 diesel engine cylinder liner as the research object ,the paper researched the mechanism of the structural parameters to deformation of the cylinder using the finite element method in order to achieve in controlling the working engine’s deformation in the design phase and to provide a theoretical basis for further controlling the deformation of the cylinder liner. 1.
Each factor chooses three levels on the main reference for the design range of the engine and combining with the expectations of proper conduct of the optimal expansion.
Effect of liner surface properties on wear and friction in a non-firing engine simulator[J].ELSEVIER TECHNICAL PAPER SERIES 2006- 1632-640
Online since: September 2011
Authors: Bulent Önay
To acquire a balanced high temperature mechanical and oxidation properties, these materials generally have multiphase and multicomponent structures.
Microstructural properties such as volume fraction, distribution and shape of the component phases can also affect the oxidation behavior of these materials [5].
However, the effect of 25 at.% Cr on the other properties of the composite material was not clear.
Oxidation and the mechanical properties of this new group of composites have been improved during the last two decades.
Since the model assumes that oxidation is controlled by the dissolution and diffusion of oxygen in the liquid phase, the rate oxidation loss of the borides is controlled by the factors including the amount of the liquid boron oxide present in the scale, its viscosity and properties of the oxide of the metallic component.
Online since: September 2011
Authors: Guo Cheng Ren, Shu Bo Xu, Cai Nian Jing, K.K. Sun
For the above-mentioned problems, the study of the main factors in the following areas, equipment, parts of its own weight of all factors, equipment, materials, mechanical properties and structural characteristics; high-speed milling process of equipment to withstand the stress of all parts of the release and re-distribution.
And it has directly affected on the precision of the machine.
Table 2 shows the 1st schemes of the static properties analysis of large-span beam.
The 2nd scheme of the static properties analysis of large-span beam stiffened plate beam structure double wall beam structure YMAX=0. 777mm YMAX=0.521 mm Table 3 shows the 2nd schemes of the static properties analysis of large-span beam.
Table 4 shows the 3rd and 4th schemes of the static properties analysis of large-span beam.
Online since: August 2014
Authors: Sai Nan Wei, Ji Ming Yao, Qian Li
With the development, various kinds of fibers have been developed for microwave absorption, such as carbon fiber [1], [2]and[3],silicon carbide fiber [4] and[5], polycrystalline iron fiber [6]and[7] and their modified fibers[8],[9]and[10] because of their light mass, excellent mechanical properties and electromagnetic properties.
And obtain the good absorbing properties by optimizing fabric specifications.
Orthogonal experimental with three factors and three levels of the fabric specifications and was the test results of absorbing properties were shown in Tab.1.
Putting the measured value into Matlab program, the net surface figure and contour map of minimum reflectivity and bandwidth were simulated and shown in Fig.1: From the Fig. 1 we can see, when the core-spun yarn diameter was in 20 ~ 35μm and the total fabric density was in 6×104~7×104/100 cm2, the minimum reflectivity can below -20dB; When bandwidth over 3GHz, core-spun yarn diameter should be limitted in 25-30μm and total fabric density in 6.5×104/100 cm.Fig. 1 also revealed the interaction between core-spun yarn diameter and total fabric and the latter was the main factors affecting the minimum reflectance and bandwidth.
As the experimental results showed, the factors of gram weight, blending ratio and interlacing point can obviously effect the absorbing performances of the double composite fabrics.
Online since: May 2012
Authors: Liu Jun Zhang, Jun Yong Liu, Biao Ding
Basic Properties Of Saline Soil Saline soil samples were original saline soil which was taken from Qarham salt lake region.
The basic properties of saline are shown in Table 1,Table 2 and Table 3.
Vertical axis: dry density; Abscissa: Water content (or other factors).
Analysis Of Vibration Compaction Influence Factors Vibration Time.
Vibration acceleration is one of the most important parameters in vibration compaction test , which affecting significantly than other factors; 2) Dry density is similar under the same vibration acceleration, and generally compaction effect is the same.
Online since: September 2020
Authors: Zhen Yu Zhao, Jing Cheng Jin, Kai Li, Hao Zhou, Hou Ming Zhou
Numerical Analysis of Effect of Different Initial Morphologies on Molten Pool Flows Kai Li1,2, Zhenyu Zhao1,a*, Houming Zhou2, Hao Zhou1,2, Jingcheng Jin1 1School of Intelligent Manufacturing and Equipment, Shenzhen Institute of Information Technology, Shenzhen 518172, China 2School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China ayxpzzy01@163.com Keywords: Laser polishing; molten pool; surface morphology; numerical simulation.
The different initial morphologies of polished surface is one of the important factors affecting the quality of laser polishing.
(b) The polished material is homogeneous and isotropic, and the change of material properties is only related to temperature.
The thermal-physical properties of Ti6Al4V used for numerical model are given in Table 1 [4].
Table 1 Thermal-physical properties of Ti6Al4V Parameter Nomenclature Value Solidus temperature (K) Ts 1877 Liquidus temperature (K) Tl 1923 Melting temperature (K) Tm 1900 Evaporation temperature (K) Tv 3315 Ambient temperature (K) Tamb 298.15 Density (kg/m2) ρ 4430 Dynamic viscosity (Pa∙s) μ 5×10-3 Thermal conductivity (W/m∙k) k 31 convection cofficient (W/m2K) h 10 4.
Online since: December 2014
Authors: Xing Hua Xie, Hui Sheng Zhou, Kang Xu
Then the factors of hot spots generated in the production of emulsion explosives and the occurred conditions of the heat accumulation are analyzed and summarized.
Physical properties of explosives and chemical composition of the underlying causes detonation turn affect the combustion process, such as the gas product hematocrit, burning heat and mass burn rate, and the quality of the fuel consumption rate is the decisive factor, it depends on the oxygen balance of explosives, permeability and the shape and size of the particles.
Those who can improve the quality of the fuel consumption rate factors can speed up the burning to detonation transition process.
At the same time, the following factors need further study: (A) the main component of explosives as well as the presence of ammonium nitrate product containing impurities, greatly accelerated the thermal decomposition is explosive burning to detonation transition root causes.
Explosives under the physical and chemical properties of the role of non-gaseous products hematocrit detonator explosives, burning heat and mass burn rate of internal combustion to detonation transition
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