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Online since: June 2013
Authors: Qun Shao, Yi Min Wang, Xiao Xia Lin
Rheological behavior, mechanical and thermal properties were characterized.
Nearly all the mechanical properties were found to be increased with the adding of POSS.
The fiber thermal and mechanical properties, however, can’t meet high demand for heavy vehicles.
The Effect of POSS on Fiber Thermal Properties.
The Effect of POSS on Fiber Mechanical Properties.
Online since: September 2016
Authors: Nikolay A. Feoktistov, D.A. Gorlenko, Konstantin N. Vdovin
These works illustrate the effect of chemical composition, alloying, and modification of the melt containing high-manganese steel on mechanical and performance properties.
The effect of the parameters of the cast high-manganese steel primary structure on the level of mechanical and consumer properties of castings has been also little studied.
Moreover, it will depend on the size of the casting or its individual parts, weight, mould wall thickness, and some other factors.
This affects the cast structure parameters and levels of properties.
Wearability of high-manganese steels in the as-cast state is caused by two factors.
Online since: December 2010
Authors: Xin Gong Li, Xia Zheng, Yi Qiang Wu
The factors and levels are indicated in Table1.
Molded boards were dried, sawed and tested for mechanical properties after natural curing for fortnight.
There was also a great deal of bubbles in the boards affecting the solidify of cement, the structure of mat and the degree of binding between bamboo particle and cement.
The mechanical properties were improved as the temperature rised within a certain range.
(2) The influence of the addition content of NaHCO3 was obvious on physical and mechanical properties.
Online since: May 2012
Authors: Anish Roy, Vaibhav A. Phadnis, Farrukh Makhdum, Vadim V. Silberschmidt
Delamination in composites severely affects their mechanical properties leading to a significant rejection rate of parts after machining.
The mechanical properties of 0° ply (fiber direction oriented in the primary loading direction) are listed in Table 1.
The experiments to determine the mechanical properties of 0° ply were conducted at the Materials testing laboratory, Loughborough University, UK .The mechanical properties of the specimen were found comparable with those reported by Hallett et al [8] .
Table 1 Mechanical properties of 0° ply of M21/T700 CFRP laminate E11 E22=E33 ν12=ν13 G12= G13 G23 115 GPa 14 GPa 0.29 4 GPa 3.2 GPa 2.2.
The contact and friction parameters in simulations were based on a number of experimental factors such as cutting speed, feed rate, geometry and surface properties.
Online since: September 2010
Authors: Ming Jen Tan, Anders W.E. Jarfors, Ehsan Ghassemali, Samuel C.V. Lim, Mei Qian Chew
There is as strong interaction between the scale of the microstructure and the size of the part affecting material flow, the so-called "size effect" in microforming processes.
The results showed that change of micro-pins diameter and die angle affect the microstructure and strain distribution of the final product remarkably, that affect the mechanical properties of the pin formed.
Among the production methods for microparts, microforming has several advantages: (i) high production rate, (ii) minimized or zero material loss, (iii) excellent mechanical properties of final product, and (v) close tolerences.
The microstructural investigations showed that there is a sinusoidal material flow from shoulder to the formed pin that could affect the pin properties.
These results showed that the mechanical properties of the pin can be more homogeneous by decreasing the pin diameter and making right die entrance angle.
Online since: October 2013
Authors: Te Li, Zhi Yuan Rui, Chi Bing Hu
,Lanzhou 730050, China Keywords: noncircular gear, transmission, pressure angle, contact force Abstract:This paper discussed some properties of ovoid gear.
The gear is a kind of special gear that transformed from the non-circular gear, hence just like the non-circular gear it also has some unique properties itself.
Other than the cylindrical gear which possess a series of theory and dynamic research achievements[3] ,the researches of noncircular gear nowadays are almost focus on geometry modeling ,machining ,kinematics simulation and so on, researches on dynamic property is rare ,even because of the following factors such as variable transmission ration ,time variable pressure angle ,eccentricity and contact ratio ,which determine the noncircular gear has different dynamic properties compared with cylindrical gear .During those factors mass and variable pressure angle are two main factors that evoke the change of contact force ,lead to vibration[4].
Journal of Mechanical Transmission.2006(30)04:7-10 [5] Zhang Ai-Mei, Jiang Jia.Wei Lijun,Zhao Juan,Wang Lei,The dynamic property research of noncircular gear.
Journal of Mechanical Transmission.2009(05):20-23 [6] Tan Weiming, The variable pressure angle property of noncircular gear with involute tooth profile.
Online since: April 2014
Authors: Gan Xin Jie, Xiao Dong Zhang, Li Fen Hu, Jian Peng, Jun Wang, Hao Feng, You Ji Tao
Effects of UV irradiation on the molecular structure and tensile properties of pure PP, α-PP and β-PP were investigated.
Therefore, preparation and properties study of β-PP have attracted active research interest in the last decades.
Degradation of polymeric materials is a common phenomenon which leads to changes in chemical, physical, and mechanical properties.
There are many factors causing polymer degradation, such as solar irradiation, heating, water, mechanical loading, chemical attack and so on.
Among these factors, solar irradiation, especial ultraviolet (UV) irradiation is a key factor which can cause photodegradation of polymer under outdoor service environment.
Online since: October 2007
Authors: Liviu Brânduşan, Şerban Domşa, Cornelia Mátyás
Increase of the Mechanical Properties of Low Alloyed Steels through Complementary Alloying C.
The mechanical properties of sintered steels are mainly dependent on the material microstructure determined by the matrix composition.
The paper presents the mechanical properties of some sintered steels obtained from mixtures of Distaloy AB, Astaloy Mo and graphite powders.
Introduction In powder metallurgy steels, more parameters determine the mechanical properties than with wrought ones, and also in different ways: while in latter case increasing the strength, e.g. by alloying, heat treatment, etc., usually means loss of ductility, in PM steels, e.g. lowering the porosity or increasing the sintering intensity positively affects both strength and ductility [1, 2].
Brânduşan,: Powder Metallurgy Progress Journal of Science and Technology of Particle Materials, Vol.3, No. 3 (2003), p. 135 [3] Van Houtte, P.: Mechanical Properties of Metals and Composites.
Online since: April 2015
Authors: N.V. Martyushev, Anton Viktorovich Korchmit
This work presents the characteristic properties of powdered materials sintering under conditions of liquid-phase sintering.
A number of technological factors, such as, pouring temperature (heat content of the melt), heat-retaining capacity of the mould (cooling rate), rotational velocity of the casting mould (in case of centrifugal casting), pouring rate of the melt into the mould, mould temperature, and some other factors, simultaneously influence the formation of the structure and properties of tin bronze castings.
Mechanical properties were determined by means of modern testing machine MIRI-100K with computer control and mechanical characteristics calculation.
Scheme of crystallization of lead phase at low (a) and high (b) temperatures of the casting Changes in structure CuPb13Sn10Zn2Ni2 under the influence of the crystallization conditions affect its properties (Figure 3).
Petrenko, Structure and properties of leaded tin bronze under different crystallization conditions, Advanced Materials Res. 872 (2014) 89-93
Online since: October 2010
Authors: Chun He Yang, Guang Jin Wang, Xiang Yun Kong, Yi Lei Gu
The strength parameters of granular coarse-grained soil are the critical factor that affects the stability of ultra-high dump.
Therefore, the strength parameters of coarse-grained soil are the main factor to affect the stability of super-high dumping.
Jingshan Jiang's studies on coarse-grained soil showed that the soil particle composition and the geometric arrangement and forces (ie, fabric)between particles of coarse granular soil were the fundamental reason that induced the macro-mechanical properties to be complex and led the macroscopic mechanical properties of coarse grained soil to show strong dispersion characteristics[1-2].
The influencing factor of shear strength can be broadly divided into two kinds[3]:1) The influencing factors can be controlled by human (such as test site, load-applying manner, sample size, confining pressures, strain rate, drainage condition and the factors related with the material properties, etc.). 2) The affecting factors beyond human control: the initial fabric of sample grain. with the help of the traditional laboratory test method, the influence of artificial control factors on the strength of coarse-grained soil had been thoroughly studied in order to obtain relatively reasonable values.
[4] GUO Qing-guo.Engineering Properties and Applieation of Coarse-grained Soil[M].Zhengzho:Yellow River Water Conservancy Press,1999
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