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Online since: May 2011
Authors: Xin Hua Chen, Yuewen Li
Impact rupture surface of the composites was observed by scanning electron microscope(SEM), and its load deformation temperature(HDT) and mechanical properties were tested.
Properties Testing and Morphology Observation: HDT was tested according to ISO75-2:2003(A) on RV-300 thermal deformation Vicat softing point temperature tester.
The improvement of the mechanical properties can be related to the improved compatibility confirmed by SEM experiments.
When BPO was used as initiator, the mechanical properties of WPC can not be improved effectively because BPO was decomposed in advance
Although the mechanical properties were both remarkable improved whether WPC was extruded at 180˚C or at 200˚C, the optimal dosage of MAH was different when extrusion temperature changed.
Online since: October 2010
Authors: Zhi Yuan Zhang, Ju Li Li, Qi Li
The quality of a product affected directly on the performance and service life [1-3].
Then the study on the automatic balancing machines with independent intellectual property rights is imperative.
It consists of the mechanical base, measurement and control unit and execution unit [6].
The mechanical base of the automated balancing machine is consisted of the turntable, rotor bed, jig, milling drive and feed.
The unbalance signal is weak and the interference factors are great, it is necessary to filter and amplify the signal before the correct calculation.
Online since: February 2011
Authors: Hui Xu, Jin Liang Huang, Xiao Wang, Yong Jun Gu, Xiang Ju Han, Qian Li
Therefore, it is important to lower the sintering temperature without much deterioration of dielectric properties.
In this paper, the effects of LiF/ZBS glass addition on the sintering behaviors and microwave dielectric properties of CLLNT ceramics were investigated.
The decrease of Q×f values might be attributed to the increment of small ionic radius Li+, resulting in the increasing migration loss, for the migration of Li+ is a more important factor than porosity to affect the Q×f values of microwave dielectric ceramics having over 90% of relative density [18].
The optimum dielectric properties of the LiF/ZBS doped CLLNT ceramics sintered at 1000°C for 3h are lower than those of the pure CLLNT ceramics sintered at above 1300°C for 4h, but these dielectric properties and the sintering temperature of so-synthesized specimen make it possible to meet the requirements for LTCC applications.
The interactions between LiF/ZBS doped CLLNT ceramic and Cu electrode, the mechanical properties of low co-fired ceramic specimens, and further lowering the temperature of CLLNT ceramic are under investigations.
Online since: April 2012
Authors: Leo A.I. Kestens, Roumen H. Petrov, Tuan Nguyen Minh, Jurij J. Sidor
It is argued that by observing the proper rolling and annealing conditions a recrystallization texture with improved normal and planar anisotropy of the mechanical properties may be produced. 1.
Introduction One of the main drivers for research on texture control in metal sheet manufacturing is the optimization of the anisotropy of sheet properties.
The deep drawability, par excellence, is a mechanical property that requires a very specific crystal anisotropy.
Asymmetric rolling of aluminum alloys with FCC crystal structure Thermo-mechanical processing significantly affects the texture evolution in the 6xxx aluminum alloy as it is shown in Fig 5.
Taylor factor maps are calculated for both symmetric and asymmetric rolling processes, cf.
Online since: April 2009
Authors: David H. StJohn, Matthew S. Dargusch, Stuart D. McDonald, Michael J. Bermingham
Introduction The grain refinement of cast components is associated with an improvement in the in-service properties and the promotion of a more homogeneous microstructure.
As with other metallic engineering alloys, a refinement in prior-β grain size in cast titanium alloys is believed to improve a number of properties including strength, ductility and fatigue resistance [1] as well offer a number of other benefits [2, 3].
[2] Yu, J., Zhao, Z.J., and Li, L.X. (1993) Corrosion fatigue resistances of surgical implant stainless steels and titanium alloy, Corrosion Science 35, 587 - 597. [3] Early, P.W. & Burns, S.J. (1977) Improved toughness from prior beta grains in Ti-6Al-4V, Scripta Metallurgica 11, 867-869 [4] Zhu, J., et al. (2001) Effect of silicon additions on microstructure and mechanical properties of cast titanium alloys, Materials Transactions 42, 336 - 341
[6] Whitsett, C.R., et al. (1977) Influence of rare-earth additions on properties of titanium alloys microstructures and room-temperature tensile properties of Ti-6Al-4V with Yttrium, Erbium and Mischmetal additions, McDonnell Douglas Research Labs
[8] Zhu, J., et al. (2003) Influence of boron addition on microstructure and mechanical properties of dental cast titanium alloys, Materials Science & Engineering A339, 53 - 62
Online since: August 2013
Authors: Yu Qian Zhao, En Lin Yu, Dong Xiao Hou, Xue Tang
To enhance the microstructure properties and dimensional accuracy of drill steel, rigid plastic finite element methods were used to analysis the Mannesmann piercing in drill steel production.
When the ovality and eccentricity increases, the flexural section modulus decreases, which could affect the comprehensive performance of drill steel.
Solid round billet completes the mechanical centering after sawing to length, which would be heated to 1050 ℃ in five DGF-T-502 frequency induction heaters, temperature difference inside and outside within 50 ℃.
The boundary conditions of friction apply shear model, and the friction factor between the rolled piece and roll is set to 0.7.
References [1]Pater Z, Kazanecki J, Barmicki J:Three dimensional thermo-mechanical simulation of the tube forming process in Diescher's mill.
Online since: April 2019
Authors: Pedro Carreira, Artur Mateus, Cyril Santos, António Raimundo Silva, Miguel Reis
These algae have excellent antioxidant, antimicrobial, antifungal and anti-cancer properties and their nano-fibers are compatible with most foods because they are water-soluble, have no odor or color.
The deposition time, evaporation rate, whipping or instability interval easely affect the morphology of the nanofiber [13].
The selection of the solvent is one of the key factors for the formation of smooth and beadles electrospun nano-fibers.
Recently it has been reported that environmental factors, such humidity and temperature also affect the diameter and morphology of the nano-fibers.
Wang, Effect of Experimental Parameters on Morphological, Mechanical and Hydrophobic Properties of Electrospun Polystyrene Fibers, Materials (Basel). 8 (2015) 2718–2734.
Online since: May 2014
Authors: Wen Zhi Zhao, De Yu Tian, Lu Zhang
Fyhrie and Cater defined the strain energy density instead of equivalent stress as mechanical stimulus.
The operation of the other models is more complex, the injury is great, these can affect the growth and metabolization of animal at different degree, besides of this, the animal is difficult to be feed after operation, therefore the experiment error will increase.
But the factor K increased distinctly within 0- 5 weeks, at the 5-10 weeks, its increasing speed begins to decrease.
Effect of Stress Environment on Bone Growing, Bone Remodeling and Mechanical Properties of Rapid Growing Rats’ Femurs[J].Chinese journal of biomedical engineering.Vol.2(2006),p.79-83 [9] Danielsen CC.
Cortical bone mass, composition, and mechanical properties in female rats in relation to age, long-term ovariectomy, and estrogen substitution.
Online since: July 2014
Authors: Gang Hu
As an extreme weather that affect the visibility, the fog bring about road transport paralysis or even an accident usually, and causing serious losses to the national economy and people's lives and property.
The other important factor which it affecting road safety was the traffic and weather information dissemination.
Fourth, on the basis of satisfying the above principle, it should be as close to the communications and power facilities, and taking into account the theft factors and not interfere with other factors.
The scope determine through major networked data to distinguish the number,the length and the time of affected sections.
Conclusion As one of the important factors, people have paid more and more attention about fog.This paper proposed needs of road safety on foggy expressway, including fog surveillance, information dissemination, travel inducing, and establish the travel inducing system.
Online since: August 2010
Authors: Shu Ming Xing, Nan Li, Pei Wei Bao
This showed that the casting temperature would affect the solid fraction distribution.
Take the Greek letter λ as the impact factor for the segregation phenomenon of solid and liquid phases in the semisolid melt.
In Eq.⑦, the direction of a∆ would be decided by cavity shape, and the size of a∆ would be affected by the filling pressure.
(3)The criterion of the impact factor λ was obtained that: 2 0Vfl a S⋅ ∆=λ ; Theλ would be affected by the acceleration ( a∆ ), the filling speed ( 0V ), the filling length (l ) and the solid fraction of the semisolid melt ( sf ).
Microstructural evolution and tensile mechanical properties of thixoformed high performance aluminum alloys.
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