Search results

Introduction The influence of hydrogen on the mechanical properties of structural materials is the subject of numerous studies due to technological problems caused by hydrogen embrittlement of metals.
It should be noted that a direct comparison of the results of ab initio calculations and experimental data for the diffusion barriers are not always correct since the experimental values are the result of many factors, the effect of which cannot always be taken into account in the calculations.
Krasauskas, Hydrogen influence on mechanical and fracture mechanics characteristics of zirconium Zr–2.5Nb alloy at ambient and elevated temperatures, Nucl.
Petrovic, Uranium–zirconium hydride fuel properties, Nucl.
Bulk properties, ActaMat. 50 (2002) 3513-3526

It not only can give full play bearing properties of materials but also better meet the requirements of designing.
In the calculation process, The tension of bolts as the key to the whole flange designment will affect the number of bolts, thickness of flange and calculation of weld size.
In this paper, Bilinear Isotropic Hardening Plasticity(BISO)Von Mises Yield criterion is used to describe the mechanical properties of the steel and MISO for bolts(Fig.3).
Force’s correction factor of bolts is 0.62.
The formula of maximum moment in flange plate Mechanical properties of forging flange are simialr to rigid flange in steel poles.

Introduction The increasing need to use the technological properties of materials with special reports are increasing use the thermal spray coatings [1].
The application of coatings is widely used in industry as a way to prevent wear of mechanical components [1].
It is among the different types of wear that affect the performance of different industrial processes.
The mechanical behavior was assessed via measures of micro-indentation hardness, using a microhardness tester (Futuretech – Model.
This resulted in greater mass loss, although this material offers greater mechanical strength.

In the general case, the global safety concept reflects the variability of the structural responses due to the random properties of basic variables.
It can be argued, that design values represent extremely low material properties, which not represent real material behaviour and thus can lead to distorted failure modes.
The partial factors for both steel and concrete failure recommended by [3] are equalized and, so, “global resistance factor (GRF)” method is approximately consistent with the PFM and has the same uncertainties (mainly, only compression type of failure).
Following both the "Estimate of the Coefficient of variation (ECOV)" method and the "Global Safety Format (GSF)" method [12] the design value of the global resistance applies: , (4) where: – the design value of global resistance; – the structural resistance predicted by a non-linear resistance model considering the mean values of the material properties ; – the global resistance safety factor according for the uncertainties related to the inherent randomness of material properties.
Taking into account LN global resistance distribution, the value can be estimated as: , (6) where: is the structural resistance predicted by non-linear analysis performing using the characteristic values of the material properties to define the structural model (i.e. ).

Sintering process affects the crystallinity of the HA layer.
Metals that can be used as the substrate layer in exchange of titanium alloy is an alloy of cobalt, because its mechanical properties is similar to titanium alloys, its biocompatibility is slightly below the titanium alloy, but the price is cheaper than titanium alloys[ 12-16].
Corrotion ratempy=0,13∙Icorr∙EWρ (2) 0.13: metric conversion factors and time, Icorr: current density when Ecorr (uA /cm2), ρ: density (g / cm3), EW: equivalent weight The corrosion test was done by inserting the sample into the Simulated Body Fluid (SBF) which was in the series of potensiostat chamber.
The influences of target properties and deposition times on pulsed laser deposited hydroxyapatite films.
Pulsed Laser Deposition on Hydroxyapatite thin Film on Ti-6Al-4V, Effect of Heat Treatment on Structure and Properties.

To combat this uncertainty, higher design safety factors and/or increased operational inspections are typically employed to ensure adequate safety [[] G.
Davinson. s.l.; Mechanical Properties of Composite Materials Containing embedded Optic fiber Sensor SPIE, 1991. ].
Table 2: Mechanical properties foam core (T-Tension, C-Compression).
Foam: Airex R82® E ν ST εT SC G 99.7 MPa 0.4 2.6 MPa 3.1∙104 με -1.4 MPa 31.4 MPa Table 3: Mechanical properties of the composite skin (T-Tension, C-Compression).
These properties were assigned to the 3D and 2D element mesh.

Therefore many road slope are constructed in the process of road construction, the stability of road slope affects the safety of its excavation and road operation phase[1].
Because the physical and mechanical properties of the weak interlayer is poorer it often brings many problems for slope engineering construction, and it usually controls the stability of road slope.
For the road slope to ensure adequate safety factor, it is recommended to take low strength parameters of weak interlayer[3].
However, owing to the complicated geological conditions, the significant difference between the actual engineering, the physical and mechanical parameters has some difference even the same rock mass in different engineering, the property of weak interlayer is different in different engineering, so must carry out specific analysis for the actual engineering.
The constitutive model must be selected in numerical analysis, which expresses the relationship between stress and strain under external load, and is the empirical description of material mechanical characteristics.

Therefore, it is very important that which factor is mainly causing the reliability deterioration of the solder joints when using different solder composition and metallization combinations.
Electronic industries have relied heavily upon the use of eutectic Sn-Pb solder for surface mount assemblies, because of its good soldering properties, low prices, adequate physical and mechanical properties and good fatigue resistance.
They have superior mechanical properties of strength, elongation, creep and fatigue resistance than Sn-Pb solder.
However, the mechanical property degradation is another reliability concern, so we concentrated on the relation between microstructure and joint strength of the solder joints during the thermal shock testing.
This is mainly caused by mechanical properties of the mere solder itself which is affected by high tin contents and dispersed Ag3Sn IMC particles within the solder region.

However, the performance of this type of bearing is greatly affected by the groove shape during the design process and the type of restrictor.
Consider a steady, we assume that the fluid properties are isotropic, isothermal, isoviscous, and laminar flow.
Hence, we defined three levels variation for the factors , , , and , respectively, listed in the Table 2.
The proposed fitness function can be defined as (5) where , , , and are weighting factors, , .
Table 2 Factors and Levels Levels Factors (mm) 1 4 7 0.2 0.02 2 6 8.5 0.4 0.04 3 8 10 0.6 0.06 Table 3 The Parameters Searching Range Parameters Range Unit 3 ~ 9 7 ~ 10 0.1 ~ 0.7 0.01 ~ 0.07 HTGA/Gray Approach.

Among these parameters, austenite chemical composition and the austenite grain size (AGS) are considered as the most important factors.
The other critical factors which influences the Ms temperature is the austenite grain size before the martensite transformation occurs.
However, in practice, in order to better the strengthening effects through grain refinement strengthening, precipitations strengthening and dislocation strengthening to improve the comprehensive mechanical properties of steel, the austenitizing temperature usually chosen below 1200°C.
The influence of grain boundaries on mechanical properties, Metall.
Zhang, Characterization of the microstructures and mechanical properties of 25CrMo48V martensitic steel tempered at different times, Mater.