Search results

But center blind-hole method is not suitable in measuring the gradient distribution with large stress gradient while X-ray method would be much affected by surface treatments and material microscopic inhomogeneity despite its capable of reflecting local details of the stress distribution.
On one hand, credibility of the measurements of the two methods was analyzed comparatively; on the other hand, applicable situation and influencing factors of the two methods were discussed.
Table 1 Detail parameters of X-ray diffraction method in stress measurement Parameter Value Parameter Value Measuring method Fixed y method Diffraction plane Steel (211), Al (331) X-ray tube target Steel (Cr), Al (Co) Peak fitting method Gaussian Tube voltage 20 [kV] Collimator dimension 2×5[ mm] Tube current 4[ mA] Exposure time / number 2[s ]/ 20 Elastic constant 1/2S2 18.5606×10-6 j0 value (°) ±28，±22.4，±16，±10.06， ±2.1，0 Hole-drilling instruments and parameters in the central blind-hole method consist of HK21B residual stresses measuring device manufactured by Shandong Huayun Electrical and Mechanical Technology Co., Ltd., 120Ω TJ120-1.5-j1.5 rosette strain gauge, drilling diameter of 1.5mm and depth of 2mm, and A, B coefficients are calibrated by a cantilever.
While central blind-hole method still has a good performance since it mainly considers material macroscopic properties.
[5] ASTM Committee E28 on Mechanical Testing.

Research done to develop efficiency the process dialysis, not only dialysis system but also the properties of membrane dialyser which used.
In the hollow fiber process, there are several factors that affect the formation and membrane pores evolution are coagulant tub distance, the spinning temperature and coagulant tub temperature.A coagulant tub temperature could affect the asymmetrical structure of the membran pores because the relation with duration of poreformation.
In this research, we used the temperature variation of coagulant tub size pore to get the appropriate pore size, proper mechanical properties and optimal filtration capability to creatinin, and to explore the temperature of coagulant tub in yielding hollow fiber with the best filtration speed to creatinin (ml /minute).
Properties of Membranes Used for Hemodialysis Therapy.
Investigation of Snear Stress Effect within A Spinneret Onflux, Separation and Thermomechanical Properties of Hollow Fiber Ultrafiltration Membranes, Journal of membranes Science 175

In the specific case of diborides the reasons for this can be attributed to different factors: first of all, the chemical composition and the surface structure of the solid specimens are hardly specified.
Oxygen transport phenomena affecting liquid surface tension, solid-liquid interfacial tension and contact angles have been thoroughly studied in recent years [[] E.
Kaufman: Thermodynamic Properties of Transition Metal Diborides in: Compounds of Interest in Nuclear Reactor Technology,edited by P.
Conclusions The peculiar physical, chemical and mechanical properties of transition metal diborides make them the ideal material for applications where extreme conditions are encountered, namely very high temperatures, high stresses, high surface mechanical and thermal loads.
However, the addition of active metals such as Ti, Zr or Hf to pure Ag, leads to very good wetting properties.

In our work, this paper discusses atomization phenomenon and generalities based on the physical properties of liquid dielectrics.
Theoretical analysis Usually, jet length and atomizing angle are the main factors used to describe the effects of liquid atomization.
In the transient area, because the charged jet is disturbed by exterior factors, vibration periodically occurs on the jet, influenced by the liquid surface tension and the jet inertia.
Table 1 Contrasting properties of liquid dielectrics Liquid dielectric Surfacetension/ 10-3N•m -1 Viscosity/ MPa•S Conductivity/ S•m -1 Kerosene 10.42 72.93 1.27×10-12 Emulsifier 56.84 1.27×103 4.26×10-5 Alcohol 22.55 47.26 3.84×10-8 Design of the spraying nozzle.
Gao: China Mechanical Engineering, Vol. 13(2002), p. 552-554 (In Chinese)

In fcc metals only one slip system is present and, as schematically displayed by fig. 1, the SFE is the main factor which determines the deformation structures.
Dislocation density, stored energy, mechanical properties increase with increasing shock pressure and pulse duration.
Mechanical twins are also generated in both Cu and Ni; for Ni higher SFE they are more difficult to form in Ni than in Cu.
The proportionality factor depends on the temperature and gives the probability that an intersection can generate an embryo.
Piero Plini of the Department of Mechanical Engineering for the assistance in shock load tests.

Because the powder catalyst don’t have a certain kind of shape and mechanical strength, it is difficult to apply in industry.
We can see that preparation method significantly affects the catalytic performance of catalysts.
As concerning the factors affecting activity, Mn-Ce/TiO2 catalysts prepared by co-precipitation method which can enhance the dispersion of CeO2 and MnOx, increase the surface area, present high denitrification activity, as they may provide more surface active sites to adsorb O2 and NO from the gas phase and then release activated oxygen species[5].
As a good oxygen reservoir, ceria (CeO2) has aroused great interest of researchers because of its oxygen storage and reducing properties.
It can be due to various factors that the subsequent decline in the surface area upon thermal treatment at higher temperatures, such as growth of crystallite size, formation of various mixed oxide phases, and sintering.

Correlation factors have been calculated assuming a vacancy mechanism and applying a developed four-frequency model for the nearest-neighbor vacancy jumps on the alkali sublattice.
In non-cubic crystals, diffusivities and correlation factors are generally anisotropic.
In the present paper, these properties are investigated in the direction perpendicular to (001) denoted as c∗-direction.
The correlation factors fNa and fK for diffusion of Na and K cations, respectively, were calculated as a function of potassium mole fraction XK and for the frequency ratios ωNa/ωK of 10, 102 and 103 (Fig. 4).
Furthermore, the correlation factors for the interstitialcy mechanism are expected to be larger than for the vacancy mechanism.

The effect of various deformation degree and temperature on static recrystallization of 304 stainless steel during two-passes hot compression deformation with the strain rate of 0.1s-1 was investigated by use of Gleeble-1500D thermo-mechanical simulation.
It is indicated that deformation degree is the most obvious factor to static recrystallization.
Introduction 304 stainless steel is one of the major materials of large forging parts used in nuclear power plants. compared with common ones, stainless steel large forging parts used in nuclear power plants have a large volume and a large weight and a high-purity, and possess homogeneous microstructures and properties.
At the same time, when the temperature is 1050℃, some static recrystallization grains begin to grow up, which can lead to mixed grain easily and affect the quality of the next pass.
Summary 1) Deformation temperature is the most obvious effect factor on static recrystallization.

Widiasanti, “Mechanical properties of normal concrete for local road pavement using plastic waste substitution as coarse aggregate,” IOP Conf.
Nassiri, “Pervious concrete mixture optimization, physical, and mechanical properties and pavement design: A review,” J.
Maallem, “The use of plastic waste as fine aggregate in the self-compacting mortars: Effect on physical and mechanical properties,” Constr.
Romdon, “Mechanical properties of polypropylene plastic waste usage and high-density polyethylene in concrete,” 2019, doi: 10.1088/1757-899X/620/1/012034
Hazem Abdellatif, “Mechanical and Physical Properties of PP and HDPE,” Eng.

Therefore, based on the hypothesis of orthotropic, elastic and linear materials, there is an easy way to estimate the bi-axial tensile properties of woven membrane materials in the leading direction only through the uni-axial tensile tests.
The tensile modulus of the materials under bi-axial or even more complicated stress condition is an essential mechanical property for the design of tensile structure, a typical membrane structure for roofs.
Due to orthotropic character of woven coated fabrics, the tensile properties under bi-axial loading are greatly affected by the stress ratio of the two perpendicular directions.
How to present and predict the tensile properties of woven membrane materials under bi-axial loading in an appropriate and applicable way?
Besides, in this prediction model, only the tensile properties of the materials under the uni-axial load are involved.