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Online since: January 2015
Authors: Dmitry G. Demyanyuk, Oleg Yu. Dolmatov, Dmitry S. Isachenko, Mikhail S. Kuznetsov, Andrey O. Semenov, Stanislav S. Chursin
High levels of mechanical and radiative properties of the final product can be ensured by the development of a production technology.
Further increase of density does not raise the temperature of the process and, therefore, does not affect the phase composition of the final product, and the properties of the resulting material.
The established difference between the numerical and instrumental experiments is related primarily to the following: the initial temperature affects not only the thermodynamic parameters of combustion wave propagation (primarily, the coefficients in the heat conductivity equation), but also the kinetics of the chemical reactions that was not taken into account in the developed model of the thermal state.
The model allows determining the process temperature at the stage of blend preparation as a function of main SHS control factors.
Dudina, Application of self-propagating high-temperature synthesis and mechanical activation for obtaining nanocomposites, Combust.
Online since: December 2012
Authors: Ji Bin Li, Feng Gong, Yan Ping Tan
Fig. 1 The structure of multi-axis cascading PCB drilling machine The high speed and high precision multi-axis cascading PCB drilling machine is a typical optic-mechanical integration product.
These factors lead to the increase of the stiffness and damping of Z-axis floor.
With the affect of contact stiffness and damping, the modes are similar and the frequencies have fewer differences in the fourth situation.
By the modal tests of the Z-axis floor on which the cascade is added and the motor spindle has been added, the results are compared with the ones without cascade, from which the affect of the cascade to the dynamic properties of Z-axis floor, which can offer the basis of the selection of cascade bar and determination of the size of the preload applied to the nut in the Z-axis floor when the cascade is assembled, is got to know.
This may have affect to the precision of drilling and the structure of the Z-axis floor needs improving.
Online since: May 2013
Authors: Teng Ma
Postoperative tendon adhesion has been one of the clinical problems plagued researchers, because it not only affects the outcome, but also results in serious postoperative complications and even makes the successful surgery fail.
Ideal anti-adhesion material should have good biocompatibility, suitable organization adhesion (needn’t sutures) , it can completely cover the wound surface and have sufficient residence time in vivo, in order to play a biological barrier function, must have a permeability, can degradation and absorption without the need for secondary surgery to remove it, can effectively prevent adhesion formation and without affecting the normal healing of wounds, should also have a certain degree of mechanical strength to facilitate the implementation of the operation.
Table 2 The mechanical properties of ES mats ES mats Elongation (%) Ultimate stress (MPa) Young's modulus (MPa) Annealed 2.50 ± 0.91 0.85 ± 0.69 30.3 ± 21.3 Non-annealed 7.54 ± 2.14 1.11 ± 0.42 23.6 ± 13.2 The Mechanism of Action of Chitosan Preventing Tendon Adhesion.
Chitosan can promote macrophage phagocytic function and improve the secretion of hydrolase activity, can secrete a variety of immune factors, regulate other cellular immunity and humoral immunity, thereby enhancing the body's ability of anti-infections.
The effect of Sodium Hyaluronate onTendon Adhesions The sodium hyaluronateIts is one kind of sodium salt, it has biological characteristics of hyaluronic acid, medical sodium hyaluronate solution has many important physical characteristics because its characteristics of without rules coiled state and hydrodynamic in solution, such as height viscoelastic, plasticity, permeability, unique theological properties and excellent biocompatibility, this biological material is non-toxic, non-antigenic, non-teratogenic and carcinogenic, it can promote tendon healing, prevent and reduce adhesion formation, it’s one kind of extensive used biomedical materials in clinical.
Online since: May 2014
Authors: Ren Haw Chen, Guo Chiuan Tzeng
When co-extruding two polymers with different rheological properties, uniformity control of the flow layer at and downstream of the confluence is vital for the quality of multilayered film products.
Another important factor that affects co-extrusion is swelling of the extrudate.
This second normal force is a function of the elastic properties of the materials and is the main cause of instability of the interface.
Wong, “Factors affecting extrudate swell and melt flow rate”, Journal of Materials Processing Technology, Vol. 79, pp. 163-169, 1998
Knobeloch, “Influence of Long-Chain Branching on the Viscoelastic Properties of Low-Density Polyethylenes”, Polymer Engineering and Science, Vol. 16, No. 12, pp. 811-816, 1976
Online since: September 2013
Authors: Xi Chen, Bao Sheng Zhao
Research on Genetic Algorithm in mold optimization design Xi Chen1, a, Baosheng Zhao 2 1School of Mechanical Engineering & Automation, University of Science and Technology Liaoning, Anshan, Liaoning, 114051, China 2International Office, University of Science and Technology Liaoning, Anshan, Liaoning, 114051, China abubble_chris@163.com Keywords: Genetic algorithm, Species evolution model, Mold optimization.
So, make k-βx instead of k, i.e. increasing saturation effect is proportional to x, β is scale factor.
The ultimate aim of gate arrangement optimization is to find a reasonable gate location, so that improve the property and quality of products.
Factors affecting the quality of the plastic parts are many; warp deformation is one of the most important flaws.
Based on the quantitative analysis of influencing factors of warp and material properties, there are the four main factors: inlet pressure, overvoltage unit percentage, overheating unit percentage, and temperature difference.
Online since: October 2023
Authors: Rudolf Hela, Jan Klobása
The addition of fibres to concrete is not only used to increase fire resistance, but also to increase physical and mechanical properties.
The aim of this work is to provide a higher resistance to extreme high temperature exposure, where factors and details related to achieving the desired result are monitored.
Discussions The addition of all types of fibres positively affected the mechanical properties of concrete under normal conditions.
The fibre-added formulations also showed an increase in their residual mechanical properties after exposure to high temperature loading.
Recycled cellulose fibres could start to be applied in concretes to increase their mechanical and durability properties [3], [5].
Online since: January 2015
Authors: Yan Chen, Xue Mei Chen, Jing Wen Zhou, Yu Can Fu, Qing Liang Chen
Experimental study on delamination during trimming of CFRP Chen Qingliang1, Zhou Jingwen2, Chen Xuemei1, Chen Yan2,a, Fu Yucan2 1 Chengdu Aircraft Industrial (Group) Company Manufacturing Engineering, Chengdu, 610091, China; 2College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China, 210016 aninaych@nuaa.edu.cn Key words: Carbon fiber reinforced plastics (CFRP), trimming, fiber direction, delamination.
Introduction The popularity of carbon fiber reinforced polymers (CFRP) in the aerospace industry has been increasing thanks to their desirable mechanical and physical properties [1].
Due to the anisotropic and inhomogeneous material properties of CFRP laminates, fiber (cutting) directions are usually the first thought during the machining of CFRP.
Factors affecting workpiece surface integrity in slotting of CFRP[J].
Online since: August 2013
Authors: Gen Tian Zhao, Chao Feng, Liao Yang Wang
Material testing According to the national standard "steel and steel products mechanical properties test sampling location and sample preparation” (GB/T2795-1998) and "metal tensile test sample” (GB 6397-88) with the relevant provisions, the thickness of each plate make a group, a total of three groups, each group have three parts.
Mechanical properties of steel Material Yield strength/MPa Ultimate strength/MPa Elastic modulus /MPa Ultimate strength and yield strength ratio Transverse link 291 445 -- 1.53 8mm thick steel plate 289 431 1.67×105 1.49 10mm thick steel plate 280 398 1.68×105 1.42 12mm thick steel plate 274 389 1.68×105 1.42 Table2.
The results show that the thickness of end plate and backing plate are major factors affecting stiffness degradation.
Online since: March 2014
Authors: Kevin Walker, Chun H. Wang, Jim C. Newman Junior
School of Aerospace Mechanical and Manufacturing Engineering, RMIT University, Melbourne, Australia 3.
Mississippi State University, Mississippi, USA akevin.walker@dsto.defence.gov.au, bchun.wang@rmit.edu.au , cj.c.newman.jr@ae.msstate.edu Keywords: cracks, closure, fatigue crack growth, plasticity, fracture surface roughness, spectrum loading Abstract Crack closure is an important factor affecting fatigue crack growth in high strength alloy materials.
However, extreme values of plastic constraint factors, significantly lower than those determined from three dimensional finite element studies on similar geometry, are needed to achieve good correlation with experimental results, particularly for materials which exhibit rough and tortuous fatigue surfaces.
Analysis using this new approach, with plastic constraint factors more closely aligned with the values determined from independent classical and three dimensional finite element studies, provide a solid basis from which to implement the approach in FASTRAN.
[15] Walker, K.F., and Newman, J.C., Jr., A new approach to determine near-threshold fatigue crack growth rate properties in high strength coarse-grain titanium alloy with rough and torturous fatigue surfaces, in 27th ICAF Symposium. 2013: Jerusalem, Israel
Online since: March 2016
Authors: Miao Yong Zhu, Xing Liang Gao, Dong Xu, Bing Zheng
These papers discussed the diffusion behavior of C element in the ferrite, martensite, austenite, and the C diffusion behavior was studied how to affect the metals properties.
Solid solution type can also affect the diffusion coefficient.
According to the traditional classic theory, for the same experimental state, the factor that affects the diffusion of the same experimental material in the same solid phase is mainly temperature.
It is believed that the total diffusion behavior is influenced by two factors.
All these factors lead to the result that the non-linear relationship between the total decarburized layer and temperature.
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