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The possible causes are identified in a particular combination of material properties and operative variables connected to the flange use.
Mechanical properties of this material are obtained from experimental tensile tests carried out on specimens of Incoloy 825, with 150HB.
Table 2: Mechanical properties of Incoloy 825, for different hardness.
FE model is able to estimate an eventual flange damage and its sealing properties.
Presence of the impression can induce a reduction in sealing properties of the joints.

Physical degradation is caused by mechanical impacts that change material properties (humidity, temperature, etc.).
Properties of plaster (porosity and cracks) allow entrance of humidity in their structure.
Also we can change properties of this material by nucleating silver nanoparticles on nanofibers.
The final material has excellent bactericidal properties [4].
Properties of this layer can be modified in accordance with the results of computational model and the internal environment.

Process stability in the thin strip casting process of the alloy has been studied, the casting temperature (superheat) was proven to be a key factor influencing process stability and casting strip quality.
Introduction Magnesium and magnesium alloys are considered to be advanced materials for 21st century because of their comprehensive properties such as lower density, high-specified strength and stiffness etc.
All of these characteristics of twin roll cast materials contribute to a significant improvement in their mechanical properties.
The main factors affecting this limit are casting speed and casting temperature.

Besides, titanium alloy has good welding, thermal and cold formability, and mechanical working property.
The mechanical properties including tensile, fracture toughness and hardness of the alloy were tested.
Fig. 1 Original microstructure of TB17 alloy used in this investigation Results and Discussion Mechanical Properties.
Table 1 Mechanical properties of TB17 alloy σb[MPa] σp0.2[MPa] δ5[%] Ψ[%] KIC[MPa·m1/2] HBW 1378 1289 8 21.7 31 393 Macroscopic Damage Characteristics.
The previous research [20] showed that the influential factors for the formation and expansion of adiabatic shear band included loading stress and microstructure such as phase size, phase content et al.

Fracture toughness testing of irradiated materials requires the use of miniaturised specimens and evaluation of TIG welding (tungsten inert gas arc welding) weldment properties is an important issue because necessary for production of nuclear fusion reactors.
Kohno [4]) studied about the mechanical characteristic of JLF-1 steel.
The mechanical properties of the JLF-1 base metal and weld joint are shown in Table 2.
From the tensile properties, the specimen of T-direction represented a lower strength and elongation at the room temperature (RT) and 400°C.
In other words, if specimen have equal shape factor (BN / le), crack-tip constraint becomes equal.

There is a general agreement that the most important factor affecting longevity of orthopedic implants is the formation of wear debris, which has been linked to problems such as tissue inflammation, bone loss, toxicity and implant loosening [4-6].
The Co–Cr–Mo alloy is one of the most used metal implant alloys for artificial joints and provides a good combination of mechanical properties, corrosion resistance and biocompatibility [4, 7].
While other researchers have analyzed the mechanical properties and tribological properties of a Co-Cr-Mo alloy after undergone nitriding process and they found a correlation between carbide concentrations and wear resistance increased with increasing treatment time and temperatures [8].
Effects of Plasma Nitriding on Mechanical and Tribological Properties.
Tribo-Corrosion Properties of Cobalt-Based Medical Implant Alloys in Simulated Biological Environments.

A Mathematical Model of Single Grain Forces in Grinding Process Jiang Jingliang1,a, Ge Peiqi1,b, Zhang Ying1,c, Wang Dexiang1 1School of Mechanical Engineering, Shandong University, Jinan 250061 acba1981@126.com, bpqge@sdu.edu.cn, cgirlcheryl@163.com Keywords: Grinding, Single grain forces, mathematical model.
Substituting the physical and mechanical properties of workpiece material (for example, choosing a common used bearing steel, GCr15): σs=785MPa, E2=207GPa, ν2=0.3 into Eq.1 and get: (2) Eq.2 shows that the value of the penetration depth of a grain will be very small when the workpiece material is in elastic deformation stage.
In Eq.3 and Eq.8, the single grain force models are mainly related with physical and mechanical properties of workpiece materials such as hardness, shear yield strength, friction coefficient with grain and so on.
The grain penetration depth is affected by grinding parameters and the value is in the range of 2~20μm as usual.
This model of single abrasive grain forces take grinding parameters, properties of grinding wheel and workpiece in to considered and can be directly used in total grinding force calculation.

Currently, one of the significant drawbacks in the RLFS is the lack of correlation between the quantity of fed LM and properties of the rolled material.
Determination of the rolling lubricant feeding system influence on the main technological parameters of the hot rolling process To determine the impact of the RLFS on parameters and characteristics of the hot-rolling process, to establish various properties and laws the statistical processing of the received information about the work of the system has been carried out.
(4) Parameter calculation of the friction moment Мfrw-br between the back-up and working rolls for steels with different mechanical properties gave a numerical representation of how this parameter varies in the lubricant supply condition (Table 1).
Development of a mathematical model for the LM flow determination When considering the determination of the LM consumption it was proposed to review the existing scheme of its supply and create a balance equation (Fig. 1), according to which the total LM consumption (4) was determined by the sum amount of expenditure on the adhesiveness of the backup roll (Qa), the ​​contact area of the working and backup rolls (Qc), as well as the amount of material carried away with the backup and working rolls (Q1) minus the LM amount lost (Q-) due to flushing water and a number of other factors, determined by the LM loss coefficient from the Eq. 5 and Eq. 6: Q=Qa+Qc+Q1-Q-, (5) Qa-Q-=k-∙Qa, (6) k-=Qa-Q-Qa=ha-h1-ha
Glivenko, Defining the parameters affecting the efficiency of the lubrication supply system for the finishing stand group on the hot rolling mill 2000 at the OJSC MMK, Science and Industry, Reports of the Eleventh All-Russian scientific-practical conference with international participation: Contemporary problems of the mining and metallurgical complex, Staroosk. technolog..

For the above reasons the frost formation becomes one of the most important factors deteriorating the performance in the refrigerating system.
Kim et al. [10] proposed dimensionless correlations of frost properties on a cold cylinder surface.
-S. (2004), Dimensionless correlations of frost properties on a cold plate.
[8] Barzanoni,Y,Tabrizi B H, Noorshams O,. (2012), Correlation for frost properties on a cold cylinder surfaces in cross flow.
-S., (2008), Dimensionless correlations of frost properties on a cold cylinder surface.

INTRODUCTION Silicon nitride (Si3N4) based ceramics are leading candidates for hightemperature structural applications because of the superior physical and chemical properties such as high-temperature strength and corrosion resistance [1].
However, these ceramics are inherently unstable in oxidizing atmospheres because of several factors such as temperature, porosity, impurity, type and intergranular phase content and humidity, affecting the oxidation rate at high temperatures [2-5].
Most of the previous works reported that plots of weight gain versus time approximate a parabolic behavior [3,6] The additives are extremely important for the success of the sintering, and consequently, for the improvement of the mechanical properties and the oxidation behavior.
Several additives, such as MgO, Y2O3, Al2O3, SiO2 and rare earth oxides, have been studied in the attempt to optimize the process and to adapt the microstructural characteristics to the intended properties.
The substitution of Y2O3 by CRE2O3 resulted in comparable results of the densification, microstructure and mechanical properties [8-10].