Search results

Influence of Sintering Process on the Mechanical Properties of Dental Zirconia Ceramics W.U.Park1, J.M.Zhao1, K.H.Hwang1,†, T.
Microwave sintering was very effective in considerable mechanical properties such as flexural strength and bulk density was drastically increased when compared with the conventional electric heating method.
It will be important to seek the accurate sintering condition of dental zirconia by microwave sintering method and continuous research is necessary for the study of the relationship between sintering methods and mechanical properties.
In addition, it lowers the sintering temperature, enhances the physical and mechanical properties, achieves a homogeneous organization, and reduces several risk factors in the work processes.[4] In the field of general dentistry they mainly use the heating and sintering method, but if dental zirconia stays in the furnace at a high sintering temperature for more than eight hours, it takes too much time and increases the cost.
In this study, methods based on microstructure and mechanical properties were evaluated by different sintering methods.

The estimation of the dependence of the mechanical properties of the rods on the variable factors has been carried out.
Further, the obtained extruded semi-finished products were tested to determine mechanical properties (ultimate tensile strength Rm and elongation to failure A) and electrical properties (electrical resistivity ρ).
Mechanical properties of semi-finished products obtained by the CCRE method.
Mechanical properties of semi-finished products obtained by the CRE method.
The assessment of the dependence of the mechanical properties of the rods on variable factors, such as the rate of deformation and processing temperature, is carried out.

Viscosity of LRI is one of the important factors affecting fluid velocity, the impregnating velocity of resin in dry mat is in inverse proportion to the viscosity.
Viscosity is one of the important factors affecting fluid velocity, the impregnating velocity of resin in dry mat is in inverse proportion to the viscosity.
This dry spot is the one of the main weaken source of mechanical property.
Therefore, it should be considered for viscosity properties of resin to optimize mold process [5-7].
Fig. 4 Impregnation area(a) and speed(b) on resin temparature Viscosity in resin filing process is one of the important factors to affect flow velocity and the rate for resin to impregnate in Dray mat is in inverse propotion to viscosity.

Influence of MPC salt on properties of mortar under sulfate environment was investigated.
Sulfate attack is one of the common factors that induce the deterioration of concrete, which has been discussed a lot during past decades [1].
For normal C3A content, sulfate attack often requires a long duration, and Ca2+ concentration is the main factor affecting ettringite formation as well as stability.
Tkaczewska, Effect of the superplasticizer type on the properties of the fly ash blended cement, Constr.
Pei, Effects of polycarboxylic acid basedsuperplasticiser on properties ofsulphoaluminate cement, Mater.

However, due to heat, the mechanical properties of the deposited material may be affected.
However, due to heat, the properties of the deposited metal may be affected.
Moreover, inter-pass cold rolling can affect SW reduction [9], compressive stress induction, and the effect on static and fatigue properties [10], as well as improve microstructural properties and reduce porosity [11].
One of the key elements affecting the hardness test is the grain size.
According to the study, thickness ratio is one of the key factors influencing the attributes.

In this case, the microstructure and the mechanical properties in the weld metal and fusion zone could be affected too.
The mechanical properties of base metal are listed in table 2.
Through several times welding thermal cycle affecting, the previous microstructures become finer and more uniform.
Microstructure and mechanical properties are closely linked.
Microstructure and mechanical properties are closely linked.

The medium is initially modeled with cross-anisotropic mechanical and thermal properties.
Based on numerical results, the thermal stresses, displacements and temperature change of the thermoelastic half space are significantly affected by the anisotropy of mechanical and thermal properties of the strata.
Both thermal flow and mechanical properties are assumed to be cross-anisotropic.
In these equations, and represent the thermal expansion factors along and normal to the symmetric plane, respectively.
Based on the numerical results, the thermal stresses of strata are compressive, and they are significantly affected by the ratio of mechanical and thermal properties , and .

In order to improve its mechanical properties and to obtain various specific properties, EPDM can be combined with other natural or synthetic rubbers like chlorobutyl rubber (CIIR) or styrene butadiene rubber (SBR) [10-14].
The effects of SBR rubbers content on the mechanical, thermal properties and adhesion ability of blends have been investigated.
Beside the mechanical properties, the adhesion strength will be examined to check the effect of some factors such as ingredients ratio, EPDM/SBR rubber ratio on the adhesion of the blend with the steel cord.
Adhesion between metal - rubber is affected much by the metal surface but not the mechanical properties of vulcanizates.
E., Improved mechanical properties of NR/EPDM and NR/ butyl blends by precuring EPDM and butyl, J.

Study on Influencing Factors on Reliability of Permanent Magnet Synchronous Motor System in Electric Vehicle Kaili Yang1,a, Qiang Song1,b 1School of Mechanical and Vehicle, Beijing Institute of Technology, Beijing 100081, China ayangkl17@163.com (Kaili Yang), bsongqiang@bit.edu.cn(Qiang Song) Key words: Electric vehicle, PMSM, Reliability, Temperature Abstract: In this paper, based on the working environment and characteristics of PMSM (permanent magnet synchronous motor) system in EV, the influencing factors and their action mechanism on the weak links with high failure rate are analyzed, concluded from the failure modes of PMSM system in EV.
In this paper, the PMSM system of electric vehicle is studied for its failure modes and reliability influencing factors.
In summary, the thermal stress has significant effects on operation reliability of all the key components of the drive-motor system, meanwhile, other factors, such as overvoltage and overload, indirectly affect the system reliability through temperature.
Any short-term high-temperature or over-voltage may impose irreversible effects on the insulation and even cause immediate failure. [3] High temperature will accelerate the physical and chemical reactions of insulating materials, deteriorating the insulating material properties and accelerating insulation aging.
Therefore, the motor operates with vibration and loud noise, directly affecting its operational reliability.[7] Under the same load, the motor bearing performance decreases as the temperature rises, and even burns to failure suddenly.

This paper presents a new mechanism affecting the stability of machining process called mass induced damping.
This effect will open a new understanding how certain mechanical factors would affect the value of damping of a system.
This is to ensure the data of the natural frequencies gathered from LMS Structure Acquisition are the true natural frequency of the thin wall plate, not other frequency such as noise or other environmental factors.
Also damping is a complicated natural occurrence especially in vibration and this study perhaps has identified one out of many factors that can cause changes in the value damping and how it affects machining process.
Moreover, with thin and delicate work piece geometry any minor changes during the cutting process should be taken into consideration taking into account varying dynamic properties which should be undertaking in future study.