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Effects of epoxy/SiO2 hybrid sizing on the mechanical properties of carbon fiber composites C.H.
It has been generally recognized that the fiber/matrix interface is one of the major factors affecting the mechanical properties of carbon fiber composites.
Therefore, it is necessary to modify the fiber surface to enhance the interfacial bonding property and improve the mechanical properties of carbon fiber composites [1,2].
The increase in mechanical properties of the sizing treated composites has been reported [3,4], but the increase degree is not very large for the common sizings.
ILSS and impact properties of the composites were used to analyze the effects on mechanical properties of composites. 1.

As input factors in turning process, the cutting speed, the feed rate and the tool nose radius were used.
The prescription of roughness parameters on mechanical drawings is very important because the surface roughness can significantly affect the functionality of the part in the whole assembly, during the service of mechanical equipment.
The factors able to influence the sizes of the surface roughness parameters and the possibilities to optimize the values of these factors in order to obtain the roughness prescribed on the mechanical drawings were investigated by the researchers [1,2,3,4].
On the basis of the above mentioned factors, the Ishikawa diagram presented in figure 1 was elaborated.
If in the case of surface roughness parameter Ra there are well known the influences exerted on it by the feed rate, cutting speed and nose radius, the way in which these factors are able to affect the surface roughness parameters Rsk and Rmr(c) was less studied and it is less known.

Identification of destructive processes affecting hydraulic servomechanisms of the aircraft control assist system Leszek UŁANOWICZ Air Force Institute of Technology 01-494 Warszawa ul.
Particular attention is paid to the description of essential properties attributable to operation of the distributing device within a hydraulic servomechanism with a spotlight to physical background of the process when friction equilibrium of a sliding hydraulic pair is disturbed, which leads to its destruction.
All in all, one can conclude that in the case of high pressure affecting the large base of a conical slider, the axial positioning of the slider is unsteady and the slider tends to be pushed aside towards the sleeve walls by means of hydraulic forces.
Variation of the Fax axial force affecting the slider as the function of the slider stroke pt = 3,5 MPa pt = 14 MPa Slider stroke x [mm] Axial force Fax [N] Fig. 12. 
When the internal leaks exceed the maximum possible threshold, the dynamic properties and the operative stability of driven facilities (steering surfaces) are subject to deterioration.

The treatment was used in order to improve mechanical and fatigue properties of the steel.
The S355J2 steel characterizes of good welding properties.
Mechanical properties of the steel.
Such behaviour of steel components with surfaces strengthened by means of friction treatment results from the effects of several factors.
Obtained research results indicate an insignificant improvement of mechanical properties of the strengthened steel under the conditions of corrosion at constant load.

The important characteristic of the aluminium cast iron is the indexes of mechanical properties, in particular, the tensile strength along with high heat resistance.
In this work the task was set at the investigating the mechanical properties of SHS aluminium cast iron to determine the effect on the strength of the factors characterizing the composition of the burden of the SHS process.
Copper also affects the morphology of the spherical shape of graphite inclusions, crushing them by restraining growth, which positively affects the mechanical properties of cast iron.
Bulyuk, Wear resistance and mechanical properties of cast iron, alloyed with boron and copper, Foundry, 1, 1992
Krestyanov, On some conditions for the production of chernozems with a high complex of mechanical properties in the cast state, Foundry, 11, 1998

Microstructure and Fatigue Crack Growth Behavior of Heat Affected Zone in P92 Steel Weldment B.J.
High fatigue crack growth rates were found along the fusion line and fusion line+2mm line into the heat affected zone. 1.
These different microstructural sub zones in the HAZ reveal different mechanical characteristics in hardness, fracture toughness and fatigue properties.
Fig.4 and 5 show the relationship of crack length (a) vs cycle (N) and fatigue crack growth rate (da/dN) vs �K (stress intensity factor), respectively.
Hence, a safety factor, should be introduced when the fracture and fatigue properties of base metal are substituted for those of HAZ.

., Kyiv, 03150, Ukraine E-mail: a avb77@ukr.net Keywords: laser welding, stainless steel, structure and mechanical properties.
This is one of the key factors affecting the development.
Such actions should cause differences in the weld metal structure, which in turn should lead to different values of mechanical properties of welded joints. 2.
The thermodynamic properties of each phase are described with a mathematical model.
Structure parameters and mechanical properties of welded joints.

Experimental Analysis on Fracture Characteristics and Material Properties of Compacted Ice and Snow Junfa Wang, Xiaoxia Li, Yaqin Li a,Tengfei Zhuang (College of Mechanical Engineering，Jiamusi University, Jiamusi, 154007, China) a liyaqin_20020702@163.com (Corresponding Author) Keywords: compacted ice and snow, experimental analysis, snow clearing concave disc Abstract:It is benefit to improve the snow clearing effect, reduce energy consumption, conserve resources and enhance the performance of the machine was pointed.
Using the depth into show, concave disc spacing and the angle between marching directions as factors, snow pack volume flaking, fracture width and snow clearing resistance as objective the three factors five levels orthogonal rotation test was conducted.
Conclusion According to the performance test of the snow clearing components of concave that the main factors affected to the snow pack flaking volume and the crack width was the concave spacing in the process of compacted ice and snow clearing, and the most optimum of concave spacing was 15mm.
Test Analysis of Concrete Flexural Strength Affecting Factors [J].
St.Peter Rack Mechanical Properties and Its Pillar Mechanics Research [3]Jiang Guirong.

The overall result of the above factors is the formation of a complex of physicochemical properties in NCPM significantly (and in some cases many times: in terms of gas permeability, resistance to cracking, sb/sy at 110 °С, etc. [15, 16,] exceeding the normative properties of the initial base industrial polymer-HDPE.
The same factors also increase the thermal properties in HDPE +Z samples (sample No. 3 from Table 3).
An important factor in the formation of a new higher level of NCPM properties should be the adaptive transformable magnetic-dimensional properties of the nanomodifier to the given thermoplastic [18].
[10] Petrov AV Thermodynamics of mixing magnetically filled polymer composites: the influence of interphase interaction on magnetic and mechanical properties.
Features of the formation of physical and mechanical properties of dispersed-filled crystallizing thermoplastic nanocomposites.

Experimental Research on Tensile-shear Behavior of Spot-welded Lap Joints of Ultra-high Strength Steel Yuehua Liu1,a, Huiping Yu2,b, Weiwei Wang3,c, Xiaoyang Li4,d, Shujun Chen5,e 1, 2, 3, 4, 5 College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China aliuyuehua@emails.bjut.edu.cn, byuhuiping@bjut.edu.cn, cwwwaptx@emails.bjut.edu.cn dlixy@bjut.edu.cn, esjchen@bjut.edu.cn Keywords: Ultra-high strength steel (UHSS), Spot-welded, Mechanical properties Abstract.
Numerical simulation based on some assumptions is the common method to research mechanical properties of spot welding joints under tensile-shear load, Baohua Chang [3] has established a computational model that consists of nugget, HAZ and base metal for the single point spot welded lap joints, and the whole stress distribution in the joints is obtained, the results show that high stress concentration around the spot weld edge may be the determinable factor for initializing and propagating of the high cycle fatigue crack.
Xingxing Xie [4, 5] adopts the local stress analysis method to study the nonlinear mechanical properties of the welded spots in a tensile-shear spot-welding lap structure, the nonlinear finite element model is established under the condition of elastic-plasticity, to analyze the strain-stress distribution rules under various loads, the conclusion indicates that the shear stresses should be the main criterion for the safety evaluation on the spot-welded structures.
Conclusions By means of experiment, including tensile-shear testing, hardness testing and morphology observation, this paper makes a research on the mechanical properties of spot welding structure of ultra-strength steel, conclusions are drawn as follows: (1) The results of Vickers hardness testing indicate that the maximum hardness of the structure is located at weld nugget, and the minimum hardness appears in heat affected zone.
Dong: Journal of Mechanical Strength, Vol. 20 (1998) No.4, P.271.