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Online since: February 2011
Authors: Qing Xi Hu, Yuan Yuan Liu, Chang Juan Jing, Da Li Liu, Qiang Gao Wang
There are many factors affecting the morphology of electrospun nanofiber, including, the internal factors (such as solution viscosity, conductivity, and so on), the external factors (such as electric field intensity and feed speed, and so on) [1, 3]; the factors that affects the macro support shaped by the RP method, includes temperature, feed speed, material parameters, and so on.
For the above forming part of the process parameters on the impact of the results, feeding rate which is the common factor of the electrostatic spinning and RP, has a very significant impact on the controllability of the quality of the scaffolds.
Repeating the above steps, a precise shape, porosity control, good mechanical properties of bone regeneration scaffold can be created.
Online since: January 2014
Authors: Yong Sheng Yan, Liang Chang, Xiang Ru Chen, Qin Hua, Qi Jie Zhai
Being one of the important micro-alloying elements, niobium can refine solidification structure and enhance mechanical properties of grey cast iron [1~3].
Ductile iron has great production and wide application, also the number of nodular graphite per unit area has great influence on the solidification behavior, solidification structure, mechanical properties and shrinkage defects of ductile iron.
Roundness, a shape factor of the area and the profile of target, is anther index to describe the feature of nodular graphite.
It was the reason that massive NbC restrained the diffusion of carbon atoms in the solidification period and affected the roundness of graphite.
Mechanical industry press (1985), Beijing
Online since: October 2013
Authors: Jiu Hua Xu, Sheng Chao Han, Jing Wen Zhou, Yan Chen
Introduction Carbon fiber reinforced polymer (CFRP) composites are increasingly being used for a wide range of applications in the aerospace and automotive industries, owing to their superior physical and mechanical properties relative to weight over traditional materials such as steel and aluminium (CFRP is ~70% and 40% lighter respectively) while being only ~20% more expensive [1].
However, the highly abrasive nature of the carbon fibers and the low thermal conductivity of the resin matrix result in rapid tool wear, thus affecting the performance of cutting tools and surface quality [3].
Compared to TiB2 coating, diamond coating has a lower friction coefficient to decrease friction force and a better wear resistant property to keep the cutting edge sharp.
Tool wear is one of the most important factors in evaluating maintenance accuracy in machining.
Tool wear of double-helix cutter is more severe than that of multitooth router because of larger cutting force and poor heat dissipation property.
Online since: January 2015
Authors: Wei Feng He, Xiang Fan Nie, Guang Yu He, Yang Jiao, Si Hai Luo
The fatigue test result indicated that the fatigue strength by the optimized technic was improved by 25%, compared to the anterior technic without optimization. 1 Introduction High Cycle Fatigue (HCF) is currently the primary cause of component failures in turbine aircraft engines, which serious affects the engines performance and flight safety [1].
Titanium alloys have been widely used in many applications including aerospace and aircraft industry because of their high specific strength, good ductility, and excellent fatigue properties.
According to the results of theoretical analysis, the LSP technic on the titanium simulated blades was optimized, and the fatigue property was improved. 2 Stress-strain distribution after LSP LSP technique shows different mechanical behaviors from static plastic deformation because the ultra-high strain rates (>106).
Consider the hardening rate is constant in the J-C model, Khan-Huang-Liang et al thought hardening rate decreased at ultra-high strain rates, and modified the J-C model, the specific form as follows [10]: (1) The equation indicates that the flow stress increase infinity with the increasing of strain rate, which is against with the regular of mechanical properties.
The fatigue strength of simulated blade was 410MPa after optimization, compared with the first process, increased by 25%. 5 Conclusion In this paper, the influence factors of residual stress fields were discussed based on the analysis of the shock wave propagation characteristic on the TC17 titanium alloy, the technic on the titanium simulated blades was optimized, and the fatigue strength was assessed by the high cycle vibration fatigue test.
Online since: June 2015
Authors: A.B. Efremenkov, Denis V. Valuev, A.V. Valueva, R.A. Gizatulin, S.N. Fedoseev
The effect of simultaneous adding of calcium, aluminum and titanium to sv.08G2S steel in a ladle during tapping from an arc furnace on mechanical properties and nonmetallic impurity has been studied [2].
Mechanical properties were determined on Ø 6.5 mm wire rod and wire of Ø 1.2; 1.6; 2.0 and 3.5 mm after hot working.
Titanium has the most considerable impact on mechanical properties of wire rods.
In the case of wire, various types of de-oxidizers continue the pattern of influence on the mechanical properties in general, but this influence is much weaker than that of in wire rods.
The effect of the simultaneous addition of calcium, aluminum and titanium to steel on mechanical properties and nonmetallic impurity in final rolled steel has been studied.
Online since: January 2013
Authors: Jin Li, Yun Dong Zhang, Han Yang Li, Ping Yuan
By altering the specific parameters of the comb structure, we studied the reflective properties of the TM light in different structures.
Figure 2 shows us the reflective properties of the P-polarized light on the silver comb-like nano-grating structures.
In this case, we can compare the light properties of the structure with the silver nano-grating structures shown in Figure 2.
Figure 4 presents a silver-SiO2 comb-like nano-grating structure and the reflective properties of the TM light on it.
But the intensity can be affected inevitable.
Online since: September 2013
Authors: Yong Xin Gao
Mining events experienced by all categories of personnel are brought about a range of psychological, physiological, and behavioral changes from multiple aspects affecting their physical and mental health.
It is divided into two main categories: one is for emergencies caused by natural and man-made factors, such as: floods, earthquakes, and so on.
These people need to be timely, professional psychological assistance and treatment, otherwise, will affect their life.
But unexpected public events of crisis intervention, is not just for these people, but for all stakeholders and individuals or groups affected by the event.
If psychological assistance do not follow-up, some trauma is likely to add to the permanent personality disorder, affecting the development process trauma throughout the life of the object.
Online since: January 2011
Authors: Yu Sen Yang, Wesley Huang, Ming Shyan Huang, Cheng Fong Huang
The film properties and morphology were investigated and analyzed.
Two major film properties were used to examine anti-sticking characteristics.
To determine the injection parameter, the hold pressure was fixed at 70 MPa, while other control factors were as mentioned above.
The factors affecting wear resistance included: coefficient of friction, hardness, adhesion, and chemical stability.
Fig. 6 Practical short injection results Flatness Analysis: The difference between the injection process control factors and the flatness of surface in the plastic specimens is shown in Fig. 7.
Online since: May 2018
Authors: Ahmed M. El-Khatib, Mohamed S. Badawi, Gamal D. Roston, Alaa M. Khalil, Moustafa M. Mohamed, Ramy M. Moussa
This modification allows controlling the properties of the synthesized nanostructured cobalt, such as composition, structure, morphology, and magnetic properties.
The value of TB for Co nanoparticles depends on some factors such as the size ,shape and method of preparation [26, 29].
The contribution of Dielectric polarization comes from four factors which are electronic, ionic, dipolar and space-charge polarization.
At higher frequencies, the electronic and ionic factors are dominants while at lower frequencies the other two factors are prevailed.
Gao, Synthesis and magnetic properties of ε‐cobalt nanoparticles.
Online since: June 2014
Authors: Hideki Araki, Masataka Mizuno, Yasuhiro Aruga, Katsushi Matsumoto, Hikaru Iwai, Hidemasa Tsuneishi
In addition to these mechanical properties, surface quality is important and much attention has been paid on the serrated flow phenomena and the related surface markings in forming process [1].
As for the microstructural factors, precipitates which are formed during natural or artificial aging before deformation may be responsible for the DSA by interacting the dislocations during deformation.
Fig.2 shows the mechanical properties for the specimens after natural aging for various times.
Fig.6 shows the mechanical properties and electrical conductivity for the specimens 0Z and 3Z after artificial aging at several temperatures.
The T’ phase precipitates are coarsened and their population are reduced after artificial aging at higher temperature, which affects the mechanical properties such as 0.2% proof stress as shown in Fig.6(a).
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