Search results

Introduction The wear process is characterised and affected by a series of parameters: geometry of surface peaks (roughness, buckles, form deviation, ect.), condition of physical mechanical upper layer, component material, wear temperature, and wear conditions, etc.
Already initially there is a problem that all these factors affecting the fittings’ wear process cannot be taken into consideration in the analytical calculation and therefore the wear calculation development in the course of time went into different directions.
Each this direction made theoretical calculations assessing sets of affecting quantities.
Irregular surface roughness schematic depiction (a) and corresponding standardized correlation function (b) In view of the above an irregular character friction surface model can be defined: surface roughness is described by a normal uniform two variable x and y random field h(x, y), possessing ergodic properties and whose correlation function is uninterrupted and has uninterrupted derivatives.
Possible separation of wear particles from surface peak Thus h0 depends on the situation of upper layer and other physical and mechanical factors determining particle formation during friction process.

IMPROVING THE TRIBOLOGICAL PROPERTIES OF MG BASED AZ31 ALLOY USING FRICTION STIR PROCESSING H.S.
Abstract Materials with improved tribological properties have become the pre-requisite of advanced engineering design.
Due to low percentage of alloying elements/second phase elements in these alloys, the grain refinement and hence the mechanical properties such as hardness cannot be appreciably enhanced.
Further improvement of mechanical properties is required to extend the application of Mg alloys [2].
Number of FSP passes and ambient conditions during FSP are among other factors affecting the process results.

Strength and hardness are essential mechanical properties of HSS parts.
Fast filed testing of mechanical properties can improve the producing efficient obviously.
The MBN signal can be affected by phase, grain size, and dislocations and so on which are crucial factors for hardness.
Conclusion Strength and hardness are essential mechanical properties of hot-stamped HSS parts.
Fast field measurement of mechanical properties can improve the producing efficient obviously.

It is also sensitive to fretting wear, greatly affect the safety of titanium.
Cubic boron nitride(CBN) is of outstanding mechanical and physical properties,including high hardness and thermal conductivity.moreover,the thermal stability,chemical stability and resistance to oxidation of the CBN are better than diamond[2].These unique properties make CBN as an ideal cutting-tool candidate in processing of the hard-to-machine materials,such as alloy steel,quenched steel and cast iron[3].
The surface hardness of the part is one of the important factors influencing the abrasion resistance.In order to obtain wear resistant coatings with good properties,a process of laser cladding coating on TC11 substrate with CBN Powder was studied,The microhardness of the laser cladding coating was measured using HVS-1000 type micro-sclerometer.Through the comparison analyses of the microhardness for the laser clad coating,studied the effect of different process parameters on the hardness of CBN coating.
Comparison of properties between CBN and diamond Properties CBN Diamond Crystal Structure Zinc-blende Diamond Lattice Constant (nm) 3.615 3.567 Density(g/cm³) 3.48 3.515 Micro-Hardness (HV) 4700 7000 Elastic Module (Gpa/cm²) 69.6 97 Melting Point (K) 3500(10.5Mpa) 4000(13Mpa) Thermal Conductivity (W/m.k) at 300K 1300 (Theoretical) 2000 Thermal Stability (K) <1673 <973 Thermal Expansion Coefficient (10E-6/℃) 4.7(800K) 3.1 Table 2.
[4] X.W.Zhang, J.B.You and N.F.Chen, Recent Advances in Synthesis and Properties of Cubic Boron Nitride Films.

Understanding how hierarchy affects their mechanical properties emerges as a primary concern, since it can guide the synthesis of new materials to be tailored for specific applications.
Understanding how these structures are related to their mechanical properties emerges, hence, as a primary concern, since it may provide guidance on the development of novel materials with unique properties [5].
Size effects on apparent mechanical properties due to the fractal nature of material microstructure have been extensively studied [7,8] (see also [9]).
The values of the material properties at each level hence depend on those of the preceding levels.
This model is based on the simplifying hypothesis of identical matrix properties at each scale level (Eq. 3).

The findings indicate that while both factors affected air permeability, only the changing thickness had a statistically significant impact on the thermal conductivity coefficient.
Table 1 provides sample codes and their properties.
The factors are statistically significant if the p-values are less than 0,05 [9].
Factors and levels.
As can be seen, the p-values ​​of both factors and the 2-way interaction of these two factors are 0.000.

Introduction As the cross geometry of large size H-Beam is relatively complicated, the rolling technology is considerably difficult and the influencing factors for the quality have many varieties.
The relationship between microstructure and mechanical properties model is basically about the prediction model of the relationship between the finished products’ room temperature microstructure and mechanical properties.
The indexes describing steel’s mechanical properties mainly include strength and toughness index.
The mechanical properties was predicted through the microstructure without consideration of the influence of pearlite.
Mathematical Models for Predicting Microstructural Evolution and Mechanical Properties of Hot Strips, ISIJ International, 32(1992) 423-432

Nano rice starch prepared by ultrasonic-assisted inverse suspension polymerization was investigated on its physicochemical, gel structure and morphology properties.
The objectives of the present study are to investigate the physicochemical, gel structure and morphology properties of nano rice starch.
Its gel strength is affected by many factors such as structure and properties of the granules, composition and structure of starch, starch molecular interactions with water, as well as the condition of gel formation.
Physicochemical and functional properties of freeze-dried and oven dried corn gluten meals.
Physical properties and enzymatic digestibility of hydroxypropylated ae, wx, and normal maize starch.

Introduction One of the factors that significantly affects the increase of profitability of metallurgical enterprises is the decreasing share of spoilage of the released products.
Deformation calculation of the system "casting-sand-clay mold" is complicated by the processes occurring in the molding medium under the influence of the casting heat flow: increase of the mold dry layer, changing the geometry and positioning of the condensation zone, as well as temperature changes in the mechanical properties of the mold [1-5].
During the calculation the changes in the mechanical properties of the compressible layer of the moldable mixture associated with the influence of temperature of the casting wall have been taken into account.
One of the major factors affecting the development of the stress during the hindered contraction is the compliance of the mixture.
Hojny, Multiscale modelling of mechanical properties of steel deformed in semi-solid state - experimental background, Key Engineering Materials, 643-650

The mechanical properties of natural fibers are dependent on the cellulose content.
Physical and mechanical properties of composite boards from plant waste are given in Table 2.
Physical and mechanical properties * and thermal conductivity composites of plant particles.
Variable in the experiment factors and their levels are presented in Table 3.
The ranges, levels and intervals of variation of factors.