Search results

At the same time, its manufacturing quality has a certain impact on the aerodynamic performance of the aircraft, so its synthetic mechanical property is required high.
It is not only a structure part, but also a mechanical part.
The requirements of the comprehensive mechanical properties and the appearance structure are properly high.
The establishment of the surface models depends largely on the factor of no gap.
It will often affect the ultimately establishment of the surface model. 4.

Thermal Deformation in a Dry Gas Seal Weibing Zhu1, a, Chengzhong Deng1,b and Heshun Wang1,c 1School of Mechanical Engineering and Automation, Xihua University, Chengdu, Sichuan, 610039, P.
The behaviour and performance of a dry gas seal are infuenced as much by the thermal behaviour of the seal as by any other factor.
Because the structures of the seal rings and boundary conditions have axial symmetry property, so the problem can be simplified as a problem of axial symmetry stable thermal conduction, its heat conduction equation [5]
Coefficient of Thermal Convection The mainly factors affecting thermal convection include fluid dynamics, geometrical shape of sealing ring, flow state of fluid and physical property of fluid.
Gu: The Mechanical Seals Technique (Machinery Industry Publishing House, Beijing2005) ,in Chinese

Equipment conditions showed by health index value in different interval are as follows[3]: 0~3.5 indicates a good condition, in which condition the equipment property is stable and the probability of stoppage occurrence is at a relatively low level.
It should be updated with factors of average trip times in a year and environment.
Correction factor of fault history fH, which is decided by fault times divided into 6 grades, according to accident investigation procedures of South Grid.
Preventive trial correction coefficient fP, which is decided by five test items of mechanical properties, loop resistance, dielectric loss, capacitance and gas test.
The correction factor of circuit breaker health index fM is obtained by comprehensive analyzing the entire above correction coefficient.

Introduction Anthropogenic accidents or catastrophes cause an emergency situation, the sudden occurrence of which leads to significant human loss or damage to people, socio-environmental and economic losses, the need to protect people from harmful effects on the health of poisonous, radioactive substances, bacteria, trauma and psychogenic factors, carrying out rescue, emergency medical and evacuation measures, elimination of the negative consequences which have developed [1].
During the operation of structures, there is an accumulation of damage in the structure of the metal, which causes a change in its mechanical properties [4].
In addition, the combination of the ultrasonic pulse method and the elastic rebound method do not affect the accuracy of interpretation.
Fig. 1 Appearance of test samples of reinforcing steel prepared to determine the strength characteristics by a “thread cut” (for example, a sample of Ø14 mm reinforcement steel, class A240C) Simply put, the experiment was reduced to the destruction of connections that were formed from the test screw and the test material (samples of fittings, whose properties were determined by the “thread cut”).
A deeper study of reinforcing steel properties after temperature exposure is much greater than it was considered in the normative literature showed that the yield strength of steel in comparison with the indicator to temperature influence decreases by 2.9% (at 800 оС), by 3.12% (at 900 оС) and 4.05% (at 1000 оC); temporary resistance – by 2.7% (at 800 оС), by 2.9% (at 900 оС) and by 3.9% (at 1000 оС).

A Resistance Model of Carbon Fiber Composite Materials based on Interfacial Effect Jing Wu 1, a, Aiqin Xu2,b 1College of Science, Naval University of Engineering, Wuhan, 430033, China 2Branch of Mechanical and Electrical Information, Lishui Vocational and Technical College, Lishui, 323000, China aprettygirl.wj@163.com ,bxaqzht@163.com Keywords: Carbon fiber reinforced cement-based composites,compression sensitivity,resistance model Abstract.
But the sensitive resistance was affected by many factors, including interface properties of carbon fiber and cement matrix contact,which is the bridge of information transmission.
It will directly affect the performance of carbon fiber reinforced cement based composites [1-3].

These alloys have good mechanical properties, corrosion resistance and die castability.
These factors cause the decrease of the Mg17Al12 phase volume fraction and the formation of new intermetallic compounds (Mg2Si, Al11RE3, Al2RE, Al4Sr, Al2Ca) which have higher stability at elevated temperatures than Mg17Al12 phase [2-7].
Thermal conductivity and thermal diffusivity are crucial parameters for metallic materials, because they affect the heat transfer rate in the processing process.
Based on results obtained in this paper, the main factor affecting the thermal diffusivity of Mg-Al, Mg-Al-RE, Mg-Al-Sr, Mg-Al-Ca-Sr alloys is aluminum content in α-Mg solid solution.
The main factor affecting the thermal diffusivity of Mg-Al, Mg-Al-RE, Mg-Al-Sr, Mg-Al-Ca-Sr alloys is content of aluminum in α-Mg solid solution.

Nonetheless, these factors can be accounted-for using fundamental mechanical principals.
Moisture content was considered to be the most important property in governing mechanical properties and was taken as either natural (N) or wet (W) which was achieved by immersing the bamboo in water for 1 week prior to testing.
To calibrate the proposed design method, an analysis was conducted against the test data with all partial safety factors equal to 1.
The analysis determined Robertson constants, modified slenderness ratios and average model factors for each species.
[10] International Organisation of Standards (ISO), ISO 22157-1: Bamboo – Determination of physical and mechanical properties – Part 1: Requirements, 2004

Fractal Characteristics of Primary Phase Morphology in Semisolid A356 Alloy Zheng Liua, Xiaomei Liub Faculty of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China a liukk66@163.com, b liuxm66@163.com Keywords：semisolid, primary phase morphology, fractal, A356 alloy Abstract: Semisolid A356 alloy was prepared by low superheat pouring and slightly electro- magnetic stirring(LSPSES).
Introduction The research has indicated that one of the microstructural characteristics in semisolid alloy with good forming properties has certain amount of non-dendritic primary phase in the alloy [1].
Discussion During formation and growth of the primary phase in the semisolid alloy, because of affecting by preparing condition and external physical field (for example pouring temperature, stirring power, stirring time, isothermal holding, ultrasonic or mechanical disturbance and so on), there will be change on the morphology and size for primary phase, at the same time, there is other change, included growth and migration of primary phase, even fuse and separation of primary phase to make primary phase morphology change.
There are the numerous complicated factors affecting the morphology during evolution of primary phase morphology in semisolid A356 alloy, in which they are nonlinear in essence.

Since the width of the bridge deck has little effect of the mechanical properties and stiffness of it, so the recommended values of the bridge decks width should be determined combined with the diaphragm and the integral stiffness of T beam bridge.
Shown from Fig. 5, the impact of the maximum transverse tensile stress by bridge deck was larger, but when the thickness of bridge deck reached 22cm, it has not significantly affected of the the maximum transverse tensile stress by increase of the thickness of bridge decks.
Since the width of the bridge deck has little effect of the mechanical properties and stiffness of it, so the recommended values of the bridge decks width should be determined combined with the diaphragm and the integral stiffness of T beam bridge.
Transverse Cracking of Concrete Bridge Decks: Effects of Design Factors[J].

The mechanical and thermal properties of PLAs can be some of the limiting factors for certain applications.
This method identified the 30 wt.% as the optimum PH content that exhibits good mechanical properties, and crystallinity.
This can affect the material’s final mechanical properties and thermal stability.
Magaraphan, “Effect of Peanut Shell Content on Mechanical, Thermal, and Biodegradable Properties of Peanut Shell/Polylactic Acid Biocomposites,” Polym.
Lau, “Polylactic acid (PLA) biocomposites reinforced with coir fibres: Evaluation of mechanical performance and multifunctional properties,” Compos.