Search results

The process mentioned is not simply caused by the mechanical factors while it must be joint consequences of mechanical, biological and chemical actions.
Environmental Influences on Concrete Structures Except concrete material properties, environmental factors become one of the main factors affecting the cause of the deterioration of the performance of concrete structures.
Self-factors affecting the degree of concrete carbonation includes the concrete component and mixture ratio, construction process factors: conservation methods and age.
Chloride diffusion coefficient reflects the indicators of concrete durability, affected by the number and characteristics of the internal pore structure and partially affected by the temperature and other environmental factors.
The Development Process of Steel Corrosion When reinforcing steel bar rusts, rust development mode, the rust speed and its mechanical impact on surrounded concrete become the essential factors affecting the durability of structure.

In order to decrease the packaging thermal stress, correlations of packaging thermal stress with the material properties, curing temperature and geometrical size of adhesive layers of adhesive materials were discussed.
The simulation results show that the Young’s modulus, thermal expansion coefficient, curing temperature and geometrical sizes of adhesive layers are important influencing factors for packaging thermal stress and the warpage of the chip.
As one of the key processes in packaging, SMT usually generates thermal stress which is one of the primary factors affecting the accelerometer’s reliability and availability.
Hence, the influencing factors for the reliability of packaging and the performance of the device, such as thermal mismatch, stress, strains during the SMT process, should be analyzed and predicted before packaging.
In this paper, the finite element analysis method has been used to reveal the relations among properties of the adhesive material, its curing temperature, geometric parameters of adhesive layers, thermal stress and resonance frequency of the resonator, so as to research the effect of the SMT process on this accelerometer.

The structures of the blends, the electrical and mechanical properties which affect electrostrictive behavior were studied.
The increase of the permittivity is one of the key factors for increasing capability of electrostrictive materials.
Therefore, the blends in this research were prepared by solution casting method for a miscibility of matrix and fillers leads to improve electromechanical properties.
The electrical properties were measured as function of filler concentration and frequency in a range of 100–105 Hz by LCR analyzer (IM 3533 HIOKI, Japan).
The electrical properties of the PU/PANI blends were studied as a function of frequency and PANI content at low filler concentration to keep Young’s modulus constant.

The mechanical properties of welded joint was studied by tensile test and the morphology of tensile fracture, microstructure as well ingredient of welded joint were observed by SEM.
There is no evident heat affect zone in the weld seams；The mechanical properties of welded joint are worse than those of matrix metal.
Introduction Magnesium matrix composites have gained increasing attention for applications requiring high strength, stiffness and particular thermal properties.
Fig.2 Microstuctures of welds of SiCp/ZC71 magnesium matrix composite (a)fusion boundary zone; (b)welded seam zone Mechanical properties of welded joints.Table 1 shows the results of the tensile test, the tensile strength of welded joint is not high, fracture occurred in the welded seam.
Table 1 Mechanical properties of joint Location of fractures happened Tensile strength（MPa） Percentage elongation (％) welded seam 80.6 1.9 Fig.3 Morphologies of tensile fracture surface of the sample Microhardness distribution of welded joints.The distribution of micro-hardness along the depth of bond zone, heat affected zone and the substrate of the welded seam zone, as shown in Fig.4.

The mechanical properties and microstructure of modified mortar and concrete using Carbon NanoTubes (CNT) are experimentally studied at 7, 14, 28 and 90 curing days.
One of the most important properties achieved by CNT, in civil engineering applications, is their capability to confer a mechanical reinforcement to cement based structural materials [9-10].
Table.1 summarizes CNT properties.
Table.1 Properties of carbon nanotubes (CNT).
As the mechanical behaviour is negatively affected by the pore content, we suggest that improvement of strength is due to a reduction of the porosity role.

This chapter will be divided into two parts to discuss the above factors affect the performance of plate.
Respectively is: (1)Sizing amount impact on basic properties of the plate (2)Ratio of API adhesive effect on basic properties of the plate Both parts of the test using single factor method.
The basic properties of the sizing amount on board On the basis of the traditional hot pressing process change the sizing amount, discusses the mechanical properties of plate.
Is this part of the test table 1-1 mechanical properties data summary.
Table 1-2 is a summary of the mechanical properties of this part of the test data.

Factors Influencing Dielectric Properties of A-171@CCTO/PVDF Composite Films Jian-wen ZHAIa, Ya-jun WANGb,*, Fu-yang LIc and Chang-gen FENGd State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China azhaijw121@sina.com, byajunwang@bit.edu.cn, c279834386@qq.com, dcgfeng@wuma.com.cn Keywords: CCTO, PVDF, A-171, Dielectric properties, Composite film.
The effect of pH and ethanol concentration on the dielectric properties of A-171@CCTO/PVDF were studied.
Ceramic/polymer composite films combine the advantages from the polymers which meet the requirements for the low cost organic substrate process, i.e. low temperature processibility, mechanical flexibility and low cost, with the advantages from the ceramic, such as desirable dielectric and electrical properties [2,3].
The dielectric properties of the films were measured by an impedance analyzer (HP4192A).
Ren, Dielectric properties of CCTO/PVDF composite films, Adv.

The geometry of CNTs and their arrangement on the substrate affect the screening effect and filed enhancement factor (β).
Introduction Multi-wall carbon Nanotubes (MW-CNTs) are promising for future electronic applications such as field emission devices, owing to their exceptional electronic properties and one dimensional structure.
Detailed reviews of the properties of CNTs as field emitters can be found in the literature [9].
To investigate the field properties of this configuration, arrays of nanotubes were studied with different inter-tubes distances.
Furthermore, the CNT emitter structure affects the geometric field enhancement factor β.

Various factors such as installation, operating conditions, hardness and material of constructions were also investigated.
Most of the components were affected by wear.
The affected surface exhibited shiny colour.
The component might also be affected by erosion.
[10] Baig Gyu Choi in: ETA phase formation during thermal exposure and its effect on mechanical properties in Ni- based supperalloy GTD 111, Korea Institute of Machinery & Materials, 2004.

Abstract. because of the synchronism belts driving has the advantages of vibration absorption, noise reduction, constant transmission ratio, so it is widely used in automotive engine timing driving system, The stiffness and damping coefficients of the synchronous belt is the main factor affecting the synchronous belt transmission in the process of vibration and noise.
Introduction Synchronous belt drive systems rely on the mesh of pulley teeth and synchronous belt teeth to transmit motion and power, Because of the synchronous belt has the advantages of simple structure, low cost, convenient installation, no lubrication, noise reduction ,vibration absorption etc., so it is widely used in industrial drive system and automotive engine timing drive system, Since the synchronous belt is a composite material body which is composed of material strength layer cord and rubber, so synchronous belt with viscoelastic properties in the transmission process, because the impact of shock, in the process of the synchronous belt transmission belt wheel tooth and tooth contact will produce vibration, The horizontal stiffness coefficient and damping coefficient of belt are main factors affecting the transverse vibration in the process of synchronous belt transmission. so this article analyzed tensioning force as a influence on auto synchronous belt stiffness coefficient
Dynamics Analysis Research on Automotive straight tooth Synchronous Belt based on MFBD[J].mechanical transmission,2012,36（9）：25-27
[2] Li Zhan-guo, Shi Yao-chen, Dynamics Stimulation Analysis Research on Automotive Multi-Wedge Synchronous Belt based on MFBD[J].mechanical transmission,2013,37(8):34-37