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Morphology and mechanical properties of injectable ceramic microspheres S.M.
Abstract The aim of this study was to analyze the effect of starting powder granulometry and sintering conditions on the morphological structure and mechanical properties of injectable hydroxyapaptite (HAp) microspheres.
The mechanical properties of the microspheres were evaluated, to investigate if their integrity could be maintained during the injection process.
On the other hand, an increase in porosity may negatively affect the mechanical properties of the microspheres, which is not desirable since their integrity must be maintained during the injection process.
Conclusions The use of HAp powders with different granulometries enabled the preparation of microspheres with different morphological structures and mechanical properties.

Numerical Investigation on Key Process Parameters Affecting Blanking of Steel Sheet by Using Finite Element Method M.
In the blanking process, some factors such as the punch-die clearance, the tool geometry and the mechanical properties of the materials influence the quality of the cross section and the dimension precision.
The tensile properties of steel sheet were investigated by applying tensile tests to the flat sample with standard geometry according to DIN50114.
In this regard mechanical properties tend to be lower in the transverse direction which is perpendicular.
The blanking tests were performed on a mechanical press with a speed of 30 strokes/min.

In this paper, the trace amounts of micro-alloying elements, Zr and Sc, have been added in the Al-Mg alloys, in order to study the effects of Zr and Sc on the recrystallization behavior and mechanisms affecting the strength, welding properties, microstructure evolution, and provide theoretical and experimental basis for micro-alloying technology application in the Al-Mg alloy sheets.
The mechanical properties of all studied stabilized alloys sheets and FSW weld joints were evaluated by room temperature tensile tests.
Friction stir welding properties.
The mechanical properties of base material and welded joint are shown in Table 2.
This was generated by welding temperature field and welding heat input, and hence to ensure the strain strengthening effect, and then improve the mechanical properties of welding joints.

The design of the tools is done considering some factors related to the material with which they will be realized and others related to the geometry.
The material must therefore be characterized by good mechanical properties at high temperatures, good oxidation resistance at high temperatures and low thermal conductivity [1-3].
Satoh, Mechanical properties of high purity polycrystalline cBN synthesized by direct conversion sintering method, Journal of materials science, 35 (2000) 1181-1186)
Liu, Effect of rotation speed on microstructure and mechanical properties of Ti-6Al-4V friction stir welded joints, Materials and design, 31 (2010) 2631-2636
Hirano Microstructural characteristics and mechanical properties of Ti-6Al-4V friction stir welds, Materials and design, 31 (2010) 1650-1655

The mechanical properties and microstructure of FW steel joints were observed. 2.
As the range of individual factor was wide, a central composite rotatable Three-factor, five-level factorial design matrix was selected.
The second-order polynomial equation used to represent the response surface HFDZ is given by: HFDZ=b0+ΣbiXi+ΣbiiXi2+ΣbijXiXj (2) And for three factors, the chosen polynomial could be expressed as: HFDZ =b0+b1(F)+b2(D)+b3(N) +b12(FD)+ b13(FN)+b23(DN) +b11(F2)+b22 (D2) + b33 (N2) (3) Where b0 is the average of the responses, and b1, b2, b3… b33 are regression coefficients that depend on the respective linear, interactive, and squared terms of factors.
Characterization of mechanical properties in AISI 1040 parts welded by friction welding [J].
Developing mathematical models to predict tensile properties of PCGT arc welded Tialloy.

Spindle speed, spindle feed, tool angle and work sample were selected as factors.
A p-value less than 0.05 represents the predominant factors and a value greater than 0.1 represents the non-predominant factors.
The optimum values of factors, outputs and desirability factors were listed in Table 5.
Feed rate, tool angle and work sample were majorly affecting the damage factor whereas speed and work sample were majorly affecting the surface roughness. 2.
Hence, the presence of natural fibers not only improves the mechanical properties, it also enhances the machinability performance of composites by reducing the damages during drilling. 3.

And we have analyzed and eliminated the errors which may affect the result of the impact test to ensure the reliability.
At the same time, it summed up the causes of errors and the methods to avoid and reduce the errors during the pendulum impact test, and analyzed the sample selection method, the chosen of impact surface, the structure as well as the temperature influence, shape and other factors which influenced the measurement results.
Impact test is used as an indicator of the N80 casing mechanical performance based on the mechanical properties of the N80 waterproof casing to inspect and analyze.
The consumption of these parts, wear and tear will directly affect the accuracy of the experimental data.
Shock attenuation properties of sports surfaces with two dimensional impact test.

Mechanical as well as the metallurgical properties are greatly influenced by the degree of dilution.
Dilution is the key factor responsible for mechanical as well as metallurgical properties of the welded member and is defined as the change in chemical composition of a deposited filler material caused by the mixing with the base material or previously deposited weld material in the deposited weld bead.
Strength, ductility, resistance to weld cracking, corrosion resistance, heat treatment and other properties may be greatly influenced by the degree of dilution.
The microstructure obtained in welding of steel can be affected by a large number of factors; the most notable among them are the weld metal chemistry (which in turn is dictated by the base metal composition, filler metal composition, the slag-metal reaction and gas-metal reaction), the cooling rate (largely dictated by the process parameters) and any other pre and post weld heat treatments done.
Among all the factors mentioned above, the chemical composition, cooling conditions, and austenite grain size capture the most essential features of a weld metal.

N.M.Mehta,etc[5] studied the mechanical properties of jute and biological resources-rice shell, husk, sugar cane and bark reinforced staple hybrid composites.
In this paper, the mechanical properties of jute/carbon hybrid composites were predicted theoretically.
Meanwhile, those two composites were analyzed about their mechanical properties.
But there is a minor error between the theoretical value and the test value, because it neglects the shear force and other factors between the interfaces when we design the mathematical model, so the model needs to be studied further.
References [1] Zhao L,Yu Jiany, Surface treatment of jute fiber and the mechanical properties of jute fiber mat reinforced composites.

As many complex factors exist such as complex structures of ground, multivariate stope boundary conditions, many stochastic mining factors and so on, it is difficult to evaluate the damage of the geological environment caused the excavation by surrounding underground coal accurately.
Due to the original constraints of geological structure, properties of rock and soil, construction methods and so on, it is difficult to use quantitative and qualitative methods to evaluate damage caused by the underground coal mining on the surrounding geological environment.
Influence Factors of Ground Surface Stability in the Process of Coal Mining In the process of coal mining and the earth's crust which is affected by mining, the deformation of most rock develops with the progressive of coal excavation.
The impact factors of ground stability caused by exploiting underground coal can be separated into coal factors, the rock of seam factor, geological structure factors, and mining conditions and so on.
Mechanical properties of the medium and seismicity characteristic conditions can not be considered simply as the impact factors of ground stability caused by exploiting underground coal.