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Thus, accurate measurement of mechanical properties for cement particles, such as elastic modulus (E) and hardness (H), is very important and meaningful.
Moreover, with the development of computer technology applied in concrete field, it is known that the microstructure of cement-based materials determines the mechanical and physical properties, as well as the transport properties and related durability.
The Oliver and Pharr method [5] was used to determine the mechanical properties, H and Er (reduced modulus).
Prior to NI, the machine was calibrated by indenting a material (quartz) of known mechanical properties.
Conclusions NI is an ideal technique to identify the mechanical properties at micro-scale.

The chemical resistance of TNT is high; long-term heating at temperatures up to 130°C barely changes its explosive properties; TNT does not lose its properties even after a long time in water.
Comparative diagrams of explosive properties of the materials Fig. 6 clearly shows a significant difference in the explosive properties of the materials of the second group, which includes materials based on heavy metals.
Defining the features of amplitude and phase spectra of dangerous factors of gas medium during the ignition of materials in the premises.
Construction of an algorithm for building regions of questionable decisions for devices containing gases in a linear multidimensional space of hazardous factors.
Explosive materials: Classification, composition and properties.

For the above-mentioned problems, the study of the main factors in the following areas, equipment, parts of its own weight of all factors, equipment, materials, mechanical properties and structural characteristics; high-speed milling process of equipment to withstand the stress of all parts of the release and re-distribution.
And it has directly affected on the precision of the machine.
Table 2 shows the 1st schemes of the static properties analysis of large-span beam.
The 2nd scheme of the static properties analysis of large-span beam stiffened plate beam structure double wall beam structure YMAX=0. 777mm YMAX=0.521 mm Table 3 shows the 2nd schemes of the static properties analysis of large-span beam.
Table 4 shows the 3rd and 4th schemes of the static properties analysis of large-span beam.

Many studies have been done about the effects of various factors on the fatigue crack growth of γ-TiAl alloys.
For the mechanical properties of metals at room temperature, the grain size is finer, and the strength and hardness is higher, and the ductility and toughness as possible.
Based on the theoretical derivation, the mechanical properties of TiAl alloy under the same heat treatment is the same.
In order to find more TiAl alloys suitable for aerospace, it is meaningful to study the influence of different factors on fatigue crack growth.
Microstructure has vital influence on the material properties.

The relation between oscillation frequency and volume flow rate only shows a weak function of fluid properties and temperature.
This kind of micro whistle could be employed as gas flow sensor which is insensitive to fluid properties.
It is also interesting to check whether the organ pipe micro whistles produce the same frequencies for gases with different properties.
The amplitude measured is amplified by a factor of 180.
The characteristic curves of organ pipes appear to be only a weak function of fluid properties such as density and temperature.

The FRP components are superior to other materials due to their particular mechanical and physical properties such as high specific stiffness, fatigue limit, high damping, good corrosive resistance and low thermal expansion which enable the structural design more flexible than conventional metals [1].
The selected factors and their levels chosen for drilling operation of GFRP composite were tabulated in Table 1.
Fig. 1: Scheme of the delamination factor Table 1 Factors and levels selected for drilling GFRP composites Factors Level1 Level2 Level3 Material thickness, t [mm] 8 12 16 Drill diameter, D [mm] 10 12 14 Spindle speed, N [rpm] 400 800 1100 Feed rate, f [mm/rev] 0.1 0.175 0.275 Numerical Analysis In this present work, to analyze the process capability of drilling on GFRP composites, 72 numbers of experiments were conducted and corresponding values of delamination factor are determined.
Machaly: Factors affecting the machinability of GFR/epoxy composites. composite Structures.
Spiring: Some properties of the family of inverted probability loss function.

However, such extensive manual polishing will provide some drawback because of many human factors such as pressure and technique of polishing individual person uses.
JIS FC300 gray cast iron has good mechanical properties with good machinability [3].
The combination of graphite strengthening microstructure and excellent mechanical properties have led to FC300 being used in a wide range of industrial applications such as automotive parts, internal engines, piping systems and construction parts [5].
Among the factors that can be influence surface quality of the product is cutting parameters such as cutting speed, feed rate, depth of cut, tool geometry, tool wear, and workpiece properties [6].
The area affected recorded around up to 6um beneath the machined surface.

The result showed that,when n(MgO)/n(MgCl2)=7(molar ratio),the mechanical properties and water resistance are the best, hydration products at this time is dominated by 518 phase.
In this paper, water resistance, mechanical properties and halogen moisture absorption are chosen as the evaluation indexes, effects of molar ratio of MgO and MgCl2 on the properties of magnesium concrete-based straw board are analyzed, which help provide the basis for further improving the properties of chloride-oxy-magnesium concrete products[7].
Water resistance is the ability to maintain its properties unchanged after soaking or long-term contacting with water.
However, its improper amount will directly affect the performance of chloride-oxy-magnesium products.
References [1] Ceng Xiwen.Study on preparation and properties of magnesium concrete-based materials.

Research on Calculation and Analysis of Clamping Force of Power Cut Self-Locking Device Xi Chuankai1, Zhao Dong1,a*, Cai Dongmei1, Fan Zhuangzhuang1, Zhou Yan1, Qin Lixiang1 1School of Mechanical Engineering, University of Jinan, Shandong Jinan 250022, China ame_zhaod@ujn.edu.cn Keywords: Self-locking device, Clamping force, Performance influence, Optimization analysis Abstract.
This paper mainly studies the principle of self-locking device, the calculation of clamping force, the performance factors and the analysis of the elastic deformation force of the lock ring in order to meet the performance requirements of hydraulic cylinder in the process of wind system lock.
The lock ring angle ranges from 20 degree to 24degree.Bychanging the properties of different materials, the value of f1is taken between 0.05 to 0.15.Andf1 is the friction coefficient between the shell body and the locking ring.
The clamping force can also be expressed as follows: W=Qf2 (4) Q:Q is out cylinder load with the direction to the right Based on the above analysis, it is found that the elastic Fk of elastic element is an important parameter which affects the performance.
FK=Qtanα+φ1tanφ2-1=18.5kN, W=FK+Qtanα+φ1=1930kN Conclusion In summary, the locking ring angle, the friction coefficient and the force of the elastic element are the important parameters which affect the hydraulic cylinder locking performance.

Biological scaffold materials for cartilage cell growth can provide the needed space environment, regulating the interaction between biological active factors and cells, promote cell attachment, differentiation and the expression of cell surface chemokine receptor.
Biological ideal scaffold should have good biocompatibility, biodegradability and pore structure and fully carrying growth factors such as the ability of.
Polyglycolic acid fiber through polylactic acid organic solvent shaping, improve mechanical properties of the scaffold material.
Acute injury affects lubricin expression in knee menisci: An immunohistochemical study.
Regional and fiber orientation dependent shear properties and anisotropy of bovine meniscus.