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Online since: August 2016
Authors: Hubert A. Gasteiger, Till Günther, Nicolas Billot, Jörg Schuster, Joscha Schnell, Franz Benjamin Spingler
All production steps in the process chain of lithium-ion batteries, especially during electrode manufacturing, are strongly interlinked and as a whole determine the electrochemical and mechanical properties of the lithium-ion cell [5].
Nonlinearities can occur during cell assembly: Depending on the mechanical properties established during calendering, electrodes may be misaligned during electrode tailoring and handling, resulting in skewed stacks and poor welding quality.
In order to achieve the desired electrode properties, the process of making electrodes needs to be responsive to the characteristics of the primary materials: The particle sizes as well as the type of solvent influence, the required mixing energy, the type of foil (rolled or electrodeposited copper or aluminum) with its specific surface properties has an impact on the wetting behaviour during coating, foil thickness impacts the mechanical properties of the electrode and thus the calendering process and so on.
In order to examine the effect of the dry mixing step on the mechanical properties of the electrode, the bending capability of the coated electrodes was measured by means of an in-house mandrel-bend test, adhesion strength with a pull-off test [14].
Even if a high quality slurry is prepared in the mixing step, too rapid drying can lead to a demixing of the solid particles and the soluble binder, affecting the adhesion and cohesion strength of the electrode.
Online since: July 2011
Authors: Yue Ming Liu, Jun Cheng, J.F. Zhang, Ya Dong Gong
Zhang1 1School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819 China agongyd@mail.neu.edu.cn, bliuyueming1000@163.com, cneuchj_2008@yahoo.cn Keywords: Micro-grinding, Surface quality, Micro-machining-system, Wear Abstract.
Machining Properties of Micro-grinding The grinding pin currently used in micro-grinding is shown as Fig.1, which holds abrasive particles on the cylindrical side and bottom face to machine different components.
(1) As the present study of mechanism of micro-grinding is still in the initial stage, many factors known and unknown may affect the surface quality, such as the abrasive particle size, the size of grinding tool, the stability of micro-machining system, the dressing of grinding pins and the random distribution of cutting edges, where compares the differences between the micro-grinding and conventional grinding from the machining and tool parameters only.
(2) As the results from theoretical formula and the actual experiment have several magnitudes difference[5], which is caused by uncertain factors in the machining process and the shape and distribution state of particles, but consider it only from the view of grinding parameters, this result is still meaningful.
Fig.5 Wear of micro-grinding pin Conclusion Through the analysis of machining properties from micro-grinding and the grinding pins wear, the comparison of surface quality attained between micro-milling and micro-grinding, the following conclusions can be drawn.
Online since: February 2014
Authors: Ye Fei, Xing Kun Wang, Wen Min Liu
Topology Optimization Of QY70G Truck Crane Turntable Structure Ye FEI1a,WANG Xingkun2b,Wenmin LIU3c School of Traffic and Mechanical Engineering,Shenyang Jianzhu University,Shenyang,China,110168 a feiye0@sina.com, b 916890480@qq.com, c levinlwm@163.com@qq.com Keywords : Truck Crane; Turntable ;HyperWorks ;Topology Optimization Abstract: Turntable is the main bearing component of truck crane, its structural-load-carrying capacity influences the operational capability directly.
Turntable is one of the important components of truck crane,it bears hoist boom, lifting, luffing mechanism and bob-weight and so on, it is the transfer center of truck crane when it works, the structure will directly affect the lifting performance of the machine.
But, the rotary table structure design is affected by the vehicle shape size and installation and space layout.
The topology optimization method for structure The common structural topology optimization methods have based structure method, homogenization method, variable density method, among them the variable density method takes variable material with its density value between 0 and 1 as structural optimization area, artificially assume the relationship between density and properties (such as allowable stress and elastic modulus) of the designed material, make the density of each unit as design variable, specify the density of each unit is the same, change the solution of structural topology into material density distribution.
The first order buckling mode of turntable factor is 2.186, the structure load as the basic arm under rated load 700000N, on the basis of buckling theory, The buckling critical load of structure=Buckling load factor X structure, therefore, the critical load simulator optimized for 1530200N, the turntable structure is stable. 3.3 Model comparison before and after optimization In contrast to the structure by finite element analysis table before and after the optimization, figure 5 gives only the comparison of the maximum stress before and after optimization of the basic arm turntable under other conditions, the results in table 3.
Online since: January 2010
Authors: L. Pentti Karjalainen, Timo J. Juuti, Raimo Ruoppa, Tero Taulavuori
The parameters affecting the kinetics and degree of the reaction were investigated.
Results Mechanical properties.
Discussion The effect of SSA on mechanical properties.
The amount of preceding deformation and the induced α'-martensite are key factors for the outcome of the ageing process.
Suzuki: Dislocations and Mechanical properties of Crystals, (John Wily & Sons, Lake Placid, USA, 1957) [11] J.
Online since: March 2012
Authors: Zhao Yang Huang
The appearance, physical properties and dimensional accuracy of plastic production largely depend on the control of mold temperature.
We can reduce products deformation, enhance mechanical properties, improve visual quality and dimensional accuracy by adjusting and maintaining appropriate mold temperature; at the same time we can shorten the injection molding cycle to improve the forming productivity.
Therefore, an appropriate choice of the parameters of the mold cooling system will help to lower production costs and improve the quality of plastic parts.[1] Mechanical optimization design is a modern design method that is based on the theory of mathematical programming and takes computer as a tool to find the best mechanical design planning which includes establishing mathematical model, choosing the appropriate optimization procedures and solution by computer.
There exist many factors affecting the effectiveness of the work of plastic mold cooling system and if we take into account the aspects from a given mold material, the cooling medium, the shape of plastic products and process conditions, the design and layout of the cooling pipe diameter is the most important part.
Mechanical engineering design analysis and MATLAB applications [M] .
Online since: March 2016
Authors: Srikanth Bontha, T. Ram Prabhu, L. Avinash
Introduction Aluminium-silicon alloys are known for their excellent combination of properties namely, low density, excellent castability, reasonable strength and stiffness, corrosion resistance and cryogenic properties and good machinability [1].
With an increase of load, more factors act concomitantly resulting in high acceleration of wear rate above the critical load.
The process of removal and regeneration of a tribofilm depends on mainly three factors: load, speed and the sliding distance.
Among the different bimodal size combination, the 4% L + 2% S bimodal size composite is found to show superior mechanical and wear resistance properties.
[12] T Ram Prabhu, Effect of bimodal size particles reinforcement on wear, friction and mechanical properties of brake composites, Material Science Forum (In Press, 2015)
Online since: April 2021
Authors: Fikrat Fakhraddin Yusubov
Overheating is one of the main factors in the reduction in braking efficiency of tribo-contact.
High temperature loading not only affecting brake pad material, thermal stresses also causing cracking disc material, simultaneously [7].
Therefore, the structure of the material has a great influence on the physical and mechanical properties.
Table 2 demonstrates the material properties which is used in modelling.
Investigation of microstructure and mechanical properties of nano MgO reinforced Al composites manufactured by stir casting and powder metallurgy methods: A comparative study.
Online since: January 2013
Authors: Hui Rong, Chun Xiang Qin, Long Zhi Li
The tailings dumps have also adversely affected the landscape and the topography of the area.
There are many factors affecting the biomineralization [11] process.
Calcium carbonate precipitation is a rather straightforward chemical process governed mainly by four key factors: (1) the calcium concentration, (2) the concentration of dissolved inorganic carbon (DIC), (3) the pH and (4) the availability of nucleation sites.
The mill tailings were collected from a iron mine dumps in Nanjing, The chemical properties of the mill tailings are shown in Table 1.
Microbial Processes and Mechanisms Affecting Bioremediation of Metal Contamination and Influencing Metal Toxicity and Transport.
Online since: March 2006
Authors: Mika Mäkinen, Markku Uoti
Thus all the factors which favour an equiaxed structure are useful to quality.
The product G*V is equivalent to the cooling rate ( •T ), which dictates the scale of solidification morphology; finer columnar structures in castings are noticed to yield superior mechanical properties compared to coarser ones, notably with respect to tensile strength and ductility.
Theory and Results The mechanical and physical properties of cast metal products are significantly influenced by the solidification structures of the metal.
Generally these segregations worsen the physical and chemical properties of materials and they should be kept as low as possible.
When the air gap has formed, the situation depends on other factors like how fast the remelted melt will solidify and what is the melt temperature.
Online since: September 2011
Authors: Li Xin Fu, Bo Chen, Hui Ren
Engineering Properties The Engineering Properties of Tunnel Portal Deluvial surrounding rock consists of boulder, cobble, silty mudstone in Xigeda strata or heavy weathered granite.
The Engineering Properties of Xigeda Strata Xigeda stratas, the well-known Late Cenozoic strata, locate in river valleys of Jinsha river, as well as its branches Anning river, Dadu river and Yalong river in the southwest of China.
The Influence of Water on Xigeda Strata‘s Physical Mechanical Property The direct shear test results and the physical mechanical parameter of rocks with different water ratios are showed in the following diagram.
From the physical mechanical properties of Xigeda Strata, we infer that cracks in the side and heading slope are typically pull-type slide and collapse.
(2) The hydrologic condition at the portal is bad, so under the influence of water percolation, Xigeda strata’s load-carrying properties and shear strength reduce dramatically.
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