Search results

Obtained results indicate significant differences in surface layer properties for both investigated machining variants.
There are few factors which affect the EDM process such as current intensity, voltage, pulse on and off time, dielectric type, material of working electrode and EDM generator type.
Further analysis of heat affected zone properties is necessary, especially to explain the differences in the amount and thickness of solidified material on the machined surface.
It leads to changes of composition in the surface layer and affects physical and chemical properties of material.
Therefore, further research should especially focus on these aspects of proposed modification of dry-EDM process and its influence on the heat affected zone properties in details.

The relationship between average pressure gradient on pipe and some influence factors (pipe axial velocity, rotating angular velocity, drilling fluid circulation velocity, and axial coordination) was analyzed.
Results showed that average pressure gradient caused by shear stress was only affected by average annular flow velocity, and it didn’t change along pipe length.
From equation (4) and (5), it was noticed that pressure gradient in this model was only related to fluid property and velocity.
But this formula only worked for the model in this paper, the constants in the formula should change when it would be used in other models with different fluid properties or different casing and wellbore with different dimensions.
Determining the Fanning friction factors of power-law drilling fluid flow in pipe and annular, Drilling Fluid & Completion Fluid, 1999(05):4-6

So, one of the important problems we need to pay more attention on is the main factors affecting the strain-hardening exponent and the influence rule.
Relationship Between Microstructures and Mechanical Properties of Strain Based Design X80 Pipeline Steel [J].
Effect of Yield Ratio on Properties of X80 Steel [J].
Influence of Dual-Phase Microstructures on the Properties of High Strength Grade Line Pipes [J].
Fatigue properties of X80 pipeline steels with ferrite/bainite dual-phase microstructure [J].

However, the factors for effecting thermal conductivity of Si3N4 are still under debate though microstructural factors (including grain size, average grian-boundary film thickness and the amount of glassy phase), lattice oxygen and sintering additives especially rear-earth oxide additives have been reported to make a difference [6,7,8].
Compared with conventional techniques, this method could develop unique Si3N4 with graded mechanical properties and have the possibility of getting complete densification [14].
There are various factors affecting thermal conductivity of Si3N4, as mentioned above and among them, Microstructure is important in understanding the thermal conductivity of a ceramic since both the phases and the distribution of the phases have a significant effect on heat transport.
Kanzaki, Thermal Conductivity of b-Si3N4: I, Effects of Various Microstructural Factors, J.
Fu, Effects of α/β ratio in starting powder on microstructure and mechanical properties of silicon nitride ceramics, Ceram.

The failure and cracks feature, damage characteristics and mechanical properties under seismic loads are comparatively analysed between joints with spread-ended beams and conventional joints.
How do spread-ended beams and tendons through joint outer region affect the shear strength and seismic performance of joints?
The mechanical properties of the joints with spread-ended beams are favorable or unfavorable?
The scale factors used between the model and prototype were 1/2.
Specimens design parameters are shown in Table1. mechanical properties of steel bars and concrete are shown in Table2.

The diffusion coefficients, pre-exponential factors, and activation energies were calculated for oxygen and nitrogen in these alloys.
Mo shows β-stabilizing properties in Ti alloys.
The Ti–Mo system has been studied thoroughly, with a particular emphasis on its microstructure and mechanical properties [18, 19].
The addition of interstitial elements such as O, C, N, and H can significantly alter the mechanical properties of the alloy, especially its elastic properties, leading to hardening or softening of the alloy [24].
Results and Discussion The diffusion of interstitial atoms in a bcc lattice can affect mechanical properties by three mechanisms: the stress-induced ordering of interstitial atoms among the possible sets of interstitial sites (Snoek Effect), segregation of interstitials to form dislocations, and precipitation.

Based on different factors, the studies have shown that chewing forces don’t have same values in the oral cavity (e.g. higher occlusal forces for male human subjects than female persons; higher biting forces for the molar zone compared to anterior teeth, etc.) [4].
For a long-term clinical success the resin-based restorations have to assure a high resistance to different factors, including strength of the remaining tissues after caries removal [3], cavity design [5], chemical and mechanical stresses developed in the lateral zones of the oral cavity [3] and distribution of masticatory forces on the periodontal ligament (PDL)-bone structures [5].
New improvements in the adhesive dentistry, have recently introduced a new generation of hybrid materials, a self-etch self-adhesive flowable composite resin, which combines the resin luting cements’ properties [7] and act as a liner material and a self-etch one-step bonding agent [6,8].
The following null hypotheses were tested: 1) the mechanical in vitro model affects the adhesive-tooth sealing performance and 2) there are significant differences between the adhesive techniques regarding marginal integrity.
Ilie, In vitro comparison of mechanical properties and degree of cure of a self-adhesive and four novel flowable composites, J Adhes Dent. 15 (2013) 1229–1236

Metallurgy tests were also conducted in order to identify factors determining the degradation of the material’s structure and the cracking processes.
Introduction The durability of facilities operating under thermal and mechanical loads, such as pipeline systems operating in the chemical and power engineering industries, cannot be discussed separately from their current material properties.
This applies in particular to changes that take place in the microstructure of the material, and to their connection with mechanical properties [1-4].
In order to find the factors that determine crack formation and development, calculations of effort of the material of T-pipe T1 were made, and samples were collected from the degraded surface for material tests.
In the discussed case, thermal expansion of the pipeline, which induces forces and moments that impose load on the T-pipe in unsteady operating conditions, is the factor which determines the effort of the T-pipe material.

The exposed coal due to the influence of water, rain and other external factors, some harmful ingredients such as sulfate, calcium oxide, trace element arsenic (As), fluoride (F), chromium (Cr) may be transferred to the surrounding water environment, pollution.
The bearing capacity of the foundation is an important index of foundation design, the correct assessment [4] of bearing capacity is to ensure that the building (structure) the key to safe and stable, but also one of the important factors affecting the entire construction project cost, it has received the attention of scholars at home and abroad.
Many factors affect the bearing capacity of the soil, such as water content, natural bulk density, internal friction angle, cohesion, due to the complexity of geotechnical properties, must carry on the unification of a mechanical model is not possible.
The Research Purpose of Bearing Capacity of Ashes Foundation Through the study of the properties of the ash soil settlement after many years, it analyses if it can be directly used as load-bearing stratum; and calculates the bearing capacity and settlement of the corresponding limit at the same time.The interaction between the pile and the furnace dust for many houses, calculates the corresponding settlement method, find out the slope treatment.
The existing of ash properties of the material are few,it takes the field sampling in order to study the direction, and have a experimental test.

Analysis of the obtained data of density and compressive strength demonstrated that the aging of the alkaline solution during 24 hours before its using has a positive effect on the physical and mechanical properties of all experimental geopolymer pastes.
Garbacz, Influence of Activators on Mechanical Properties of Modified Fly Ash Based Geopolymer Mortars, Materials (Basel), 13(5) (2020) 1033 [21] Mohd Mustafa Al Bakri Abdullah, H.
Baghshahi, The effect of mixing molar ratios and sand particles on microstructure and mechanical properties of metakaolin-based geopolymers, Materials Chemistry and Physics, 240 (2020) 122223.
Yang, Mix design factors and strength prediction of metakaolin-based geopolymer, Ceram.
J. van Deventer, Understanding the relationship between geopolymer composition, microstructure and mechanical properties, Colloid.