Search results

Is the study of drilling pressure, rotating speed, hydraulic parameters, drilling combination drilling parameters and mechanical drilling rate, and so on.
However, In the drilling operation, affect the rate of penetration is very complex, factors affecting is very various.
And deep retrieval method based on knowledge is according to the characteristics of attribute importance in question given properties of different weights, usually combined with the nearest neighbor method is used.
The average rate of penetration is 15.32 m/h in 2011, the average rate of penetration after optimization is 21.35 m/h in 2012, after optimizing the mechanical drilling rate increased by 39.36% than before optimization.
(2) The characteristics of case base organization, sample selection and retrieval, similarity measure method and the correction of sample characteristics directly affect the quality and quantity of drilling parameters, and directly affect the credibility and fidelity of drilling parameter optimization

Among these processes, the micro/meso forming has the advantages of high productivity, minimal or zero loss of material and the excellent mechanical properties for the final products, etc.
At the same time, dynamic instability and process conditions have become a non-negligible factor.
Based on lots of experiments, it can be concluded that the physical and mechanical properties of the material begin to show variable laws compared with macroscopic dimensions when the size of the specimen or the feature reaches millimeter or sub-millimeter, due to the size effects.
Typically, the size effect is not an independent phenomenon, but a phenomenon induced by a combined effect of various environmental factors and the material itself.
Chan: Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, Vol. 528 (2011), No. 13-14, pp. 4799-4806

This article mainly study on the law of the influential factors of the different heat-treated FGD gypsum on the performance of slag cement to determine the manner and feasibility of resource utilization in cement-based materials[7,8].
Conclusion （1）The heat treatment conditions and dosage are important factors of the setting time and strength of the FGD gypsum.
（2）In the case of adding the same amount of the FGD gypsum, the heat treatment process is an important factor to affect the setting time of cement.
Influence of FGD Gypsum on the Properties of Portland Cement.
Coalash, 2011, 4: 24-26 [5] Pavel Tesarek. flue gas desulfurization gypsum: Study of basic mechanical, hydric and thermal properties [J].

Functionally graded materials (FGM) are materials with varying electrical, chemical, mechanical, magnetic, thermal properties over the volume of the bulk material.
The continuous variations in the properties of FGM along a specific axis are based on different factors including porosity and pore size, chemical and microstructural gradient-structures.
Moreover, due to the varying physical properties of FGMs, it is used for a wide range of applications including nuclear, automobile structure, aerospace, and optoelectronics.
The physical properties of solid as well as fluid are constant, the fin temperature variation is assumed one-dimensional and steady.
Makinde, Analysis of heat transfer in a cylindrical spine fin with variable thermal properties, Defect and Diffusion Forum, 387 (2018) 10–22

Needle deflection and soft tissue deformation are the most important factors that affect accuracy in needle insertion.
The anisotropic properties of the soft tissue lead to the different stiffness coefficients on the needle shaft.
At time slice i, the needle tip gets to node i and the nodes from 1 to i-1 are affected by the soft tissue's reaction.
The deflection of the needle is the superposition of those two factors.
During the simulation process, the soft tissue is regarded as symmetry and its properties are constants (The Young's modulus is 2.53Pa and the Poisson's ratio is 0.48).

The reliability and safety of their work depends on many factors: geometric dimensions, materials used, external loads and their combinations, etc. [3, 4].
Parameters of fire-retardant coatings of steel constructions under the influence of climatic factors.
Results of experimental research into correlations between hazardous factors of ignition of materials in premises.
Impact of halogen-free flame retardant with varied phosphorus chemical surrounding on the properties of diglycidyl ether of bisphenol-A type epoxy resin: synthesis, fire behaviour, flame-retardant mechanism and mechanical properties, RSC Advances, 6(64), 59226–59236
Mechanical properties modification of a thin film phenolic resin filled with nano silica particles, Computational Materials Science, 96, 411–415

These properties were simulated under the acetabular component.
Reasons of this can be injuries, genetic factors or wear.
The deteriorated mechanical properties are simulated in particular areas of surrounding THA of the system.
The bone mass has bad mechanical properties and it becomes fragile.
Konečný, Material Properties of Bone Tissue Obtained from CT for Biomechanics Purposes.

Gas sealing performance of metal seal ring directly affects the security and reliability of equipment operation.
An average pressure flow factor Φ is introduced considering the sealing contact surface roughness, which represents the ratio of rough surface average flow and smooth surface flow. average pressure flow factor Φ is multiplied by the pressure gradient.
(22) (23) Cases of engineering applications The following material properties of metal W shaped ring are selected: E1=1.1×1011Pa, ν1=0.3, hardness H=3.4×108Pa. flange material is usually harder than the seal surface, so E2=2.1×1011Pa, ν2=0.3.
Because the dimensionless separation ho* impacts on the flow factor Φ.
When the dimensionless contact pressure P* is at high value, the surface roughness mainly affects the dimensionless leakage Q*.

The slag content, the creation of the early hydrated products, pore structures of OPC mortars introduced with BFS are considered as the main factors.
Physical and chemical properties of BFS are believed as the reason.
“Mechanical activation of granulated blast furnace slag and its effect on the properties and structure of portland slag cement”, Cement and Concrete Composite, 30, 679-685
“Hydration, structure, and properties of blast furnace slag cements, mortars and concrete”.
C., and Wellington R., Mechanical properties, drying and autogenous shrinkage of blast furnace slag activated with hydrated lime and gypsum, Cement & Concrete Composites, 32 (2010) 312–318

The surface roughness of ADI workpieces were tested after the finish turning at changed cutting parameters, and the influencing factors of surface quality were analysed.
Introduction Austempered Ductile Iron (ADI), which can obtain excellent synthesis mechanical properties such as high hardness, high tenacity, high flexural strength and contact fatigue strength and good abrasion performance after the application of isothermal quenching, is concerned to be high-technology material in 21st century[1,2].
The Ductile Iron used in this experiment was prepared in the form of cylindrical barrel with Φ35mm×2000mm, and the chemical composition (mass percent) of DI and the mechanical properties are given in Table 1 and Table 2.
Through further microstructure observation of ADI materials, fundamental changes were observed which made the change of ADI materials’ mechanical properties after the isothermal quenching procedure.
As the change of quenching temperature and time, the carbon content and the retained austenite changed reflected in the mechanical properties especially hardness of workpieces changed.