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Moreover, the time when the water-cone breakthrough will directly affect the final recovery of the gas wells, therefore, the numerical simulation method is used to conduct the research on the key influencing factors of water-invasion performance for the gas wells with bottom-water, which is the basis of the mechanical model for the typical gas wells with bottom-water.
It indicate that as followings: (1) the key influencing factors of water-invasion performance for the gas wells with bottom-water are those, such as the open degree of the gas beds, well gas production and the amount of Kv/Kh value; and (2) the barrier will be in charge of great significance on the water-controlling for the bottom water gas wells, and its radius is the key factor to affect water-invasion performance for the bottom water gas wells where the barriers exist nearby.
Lots of researchers have already been conduct some study aimed at water-invasion [1-6], in this paper, however, taking the PG gas-field as an example, typical mechanical models were established, and its key influencing factors of water-invasion were worked out by using the numerical simulation. 1.
Key influencing factors of water-invasion performance Numerical simulation research on the key influencing factors of water-invasion performance was carried out, which is based on the above mechanical models for the typical bottom-water gas.
Conclusions Mechanical models for the typical gas wells with bottom water were established through the numerical simulation methods, moreover, the numerical simulation for the six factors of that will influence water-invasion performance

The mechanical properties and stress-strain curves were obtained.
The low temperature mechanical properties such as maximum tensile stress, elastic modulus and strain at maximum stress against temperature are different from room temperature mechanical properties.
The study is devoted to the investigation of low temperature failure mechanism and mechanical properties law of HTPB propellant.
There are two factors for causing stress yield: (1) internal factors, which are plastic behavior of propellant matrix at low temperature and high content of greater particle, and (2) eternal factors, such as the low temperature and loads, which will induce crack propagation, cavities, and de-wetting.
Mechanical properties analysis.

Analysis of Influencing Factors on Mechanical Properties and Anisotropy of Attapulgite/NR Composites Xiaolong Lua, Qingguo Tangb, Jinsheng Liang, Yan Ding and Hao Guo Institute of Power Source & Ecomaterials Science, Hebei University of Technology, Tianjin 300130, China aol_x_lo@163.com, bqingguo_tang@hebut.edu.cn Keywords: attapulgite, nature rubber, composites, mechanical properties, anisotropy Abstract.
Results indicated that mechanical properties were better when the OAT content is 50 phr and thin-passing is 20 times, meanwhile, the longitudinal and transversal tensile strength of OAT/NR composites were 17.010.5 Mpa and 14.180.5 Mpa respectively.
The mechanical differences of OAT/NR composites in L and T direction are analyzed and the anisotropy of composites was studied, based on the relative difference values ε of mechanical properties of composites.
Therefore, the mechanical properties and anisotropy of OAT/NR composites can be improved obviously by heat treatment to OAT/NR blend.
Proper mixing technological parameters and the OAT fibers content in rubber are also very critical to the mechanical properties and anisotropy of OAT/NR composites.

The properties of the composites are determined by the properties of fillers, such as mechanical properties, content, size, shape, interfacial interaction with polymer matrix and dispersion, etc [3, 4].
Results and Discussion Mechanical Properties.
Table 1 Mechanical and insulating properties of the epoxy resin modified with spherical silica particles.
Dielectric and Insulating Properties.
The dissipation factors show an increasing trend with increasing frequency from 100 Hz to 2 MHz.

Magnesium alloys present acceptable mechanical properties but their high temperature properties are unsatisfactory.
To achieve good mechanical properties these alloys are modified with zirconium.
Mechanical and structural properties were investigated.
This alloy guarantee good casting properties and weldability, connected with acceptable mechanical properties [2].
The mechanical properties of the alloys are presented in table 2.

Effect of process parameters on heat affected zone in micro machining of borosilicate glass using µ-ECDM process Lijo Paul a and Somashekhar S Hiremath b Precision Engineering and Instrumentation Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai - 600036, India alijo.paul@gmail.com, bsomashekhar@iitm.ac.in Keywords: µ-ECDM, heat affected zone, material removal rate, grey relational analysis Abstract.
Application of borosilicate glass in Micro Electro Mechanical Systems (MEMS) devices are increasing due to many of its intrigue properties.
But still many limitations like Heat Affected Zone (HAZ) and cracking in glass limited its application.
Duty factor is found to be a predominant factor affecting the machining characteristics.
Since voltage and duty factor are contradicting muli objective optmisation is done with GRA [9-10].

Therefore, the size of ZnO affects to properties of the final rubber product.
Cure Characteristics and Mechanical Properties.
Cure Characteristics and Mechanical Properties.
The influence of nZnO on the mechanical properties is also showed in Table 1.
Cure characteristics, mechanical properties and swelling value of the rubber stopper.

The results showed that the mechanical properties in the axial direction were lower than those in the circumferential direction.
In general, these parts are manufactured by forging, extrusion and rolling to improve the mechanical properties of materials [3].
The large difference of mechanical properties in the different directions may cause serious problems.
In this process, any factor that provides resistance or assistance affect toughness and ductility of aluminum alloys [9].
But the relationship between the orientation of particles and mechanical properties require further quantitative analysis.

Keywords: Friction Stir Welding, Copper, Microstructure, Mechanical properties, Fractography.
The shape of the tool pin profiles influences the flow of plasticized material and affects weld properties .
Mechanical properties Mechanical properties such as tensile strength, yield strength, percentage of elongation, impact toughness and microhardness have been evaluated.
Table 1 shows the tensile properties for BM and mechanical properties of the copper welded joints.
Microstructural Factors Governing Hardness in Friction-Stir-Welds of Solid-Solution-Hardened Al Alloys.Metall.

Titanium significantly improves the mechanical properties, especially the ductility of a diecast Al5Mg1.5Si0.6Mn alloy.
We have carried out an assessment of the mechanical properties of an HPDC Al-Mg-Si alloy with different levels of titanium addition.
This composition can provide an excellent combination of mechanical properties in the as-cast state [5].
All the castings were left in ambient atmosphere and at room temperature for at least 24 hours before testing the mechanical properties.
The results, as shown in Fig. 1, reveal that Ti addition significantly improves the mechanical properties of the Al-Mg-Si alloy in the testing range.