Search results

Faulty insulators could appear in the HV transmission line insulator string under the comprehensive effect of electrical, mechanical and environmental factors and they can be detected according to the space potential and electric field distribution variation characteristics around the insulator string.
Introduction With a long-term operation under mechanical stress, electrical stress and complex environmental conditions, electrical insulation and mechanical characteristics of porcelain insulators will reduce gradually, which may lead to the degradation of insulators [1] .
(a) Passing through the sheds (b) In the air Fig.4 Influence of a faulty insulator on the synthetic electric field A conclusion can be drawn from Figure 3 and Figure 4 that the potential and electric field distributions around the insulator string are affected by the position of the faulty insulator, the extent of which varys with the position.
Acknowledgements This work was supported by Science and Technology Program of Electric Power Research Institute of Sichuan Electric Power Corporation, Electrical and Mechanical Performance Nondestructive Test and Life Assessment of Transmission Line Suspension Insulator.
References [1] Shaomin Wang, Gang Wei, Li Wang: Insulators and Surge Arresters, Issue 5(2006), p.6-8(In Chinese) [2] Yangchun Cheng, Chengrong Li, Bin Liu: 8th IEEE-ICPADM conference (2006), p.615-618 [3] Yewei Tu, Qiangfeng Xia:High Voltage Apparatus, Vol.48(03) (2012), p.67-74(In Chinese) [4] Subba Reddy B, Satish Naik B, Udaya Kumar and L Satish:Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials (2012), p.1-4 [5] Xingliang Jiang,Qiangfeng Xia, Hu Qin, etal: Proceedings of the CSEE, Issue 16 (2010), p.118-124 (In Chinese) [6] S.Birlasekaran, H.J.

A decrease in the machinability of this material is associated with a change in their mechanical and thermophysical properties during grinding to ensure the specified dimensions.
Thus, microhardness of the surface decreases with an increase in the temperature in the cutting zone; therefore, all operating factors contributing to an increase in the temperature in the cutting zone or an increase in the duration of thermal exposure lead to a decrease in surface hardening.
The depth of cut and the control wheel speed affect the dimensions of the machined part by reducing the actual metal removal from the machined surface, but at the same time practically do not affect the stability of the resulting dimensions. 4.
Strelnikov, The influence of the formulation components and the mixing technology on physical and mechanical properties of abrasive wheel, MATEC Web of Conferences 297, 09005 (2019). https://doi.org/10.1051/matecconf/201929709005 [2] D.B.
Bovnegra, Improving the Performance Properties of Abrasive Tools at the Stage of Their Operation, Lecture Notes in Networks and Systems 76, pp. 136-145 (2020). doi: 10.1007/978-3-030-18072-0_15 [9] V.

During this process the different thickness of the two sheets can cause an unequal heat distribution below the tool, affecting material flow and therefore components strength.
Heat mainly affects material flow, grain structure and therefore the tensile strength in the weld zone which leads to reduced components strength [3, 4].
Finally, a constant shear friction factor of 0.18 has been used for tool-sheet interface on the basis of a preliminary numerical campaign.
Future work will be focused on the analysis of the mechanical properties of the joints, as well as on the study of the forces acting on the tool during the process.
Wang, Effects of heating process on the microstructures and tensile properties of friction stir spot welded AZ31 magnesium alloy plates, Materials and Design 32 (2011), 5033-5037

Mechanical properties measured were yield and ultimate strength and elongation.
Microstructure and mechanical properties.
Mechanical properties for rolled wire rods.
Microstructure and mechanical properties.
Academically there is no way to tell if precipitation is a determining factor in obtaining superior properties for wire rods or for intermediated bars.

However, many of daily used materials are degradationed under the influence of environmental factors, in the effect, is worsed the end quality of the waste [20, 21].
Performing the re-injection moulding process did not fundamental importance to change the mechanical properties marked during tensile strength tests.
Hiver: Recycling effects on the rheological and thermomechanical properties of polypropylene-based composites.
Kostrzewa M.: Mechanical and Thermal Properties of Epoxy Resin Modified With Polyurethane.
Lancellotti: New polypropylene/glass composites: Effect of glass fibers from cathode ray tubes on thermal and mechanical properties.

Different mechanical properties are assigned to the zinc coating and the steel substrate.
Although coating would not directly alter the mechanical behavior of steels, however its frictional behavior may change the strain path during the forming process and ultimately affect the formability of the sheet metal.
The model accounts for surface height distribution, work hardening, material properties of the coating and the underlying steel substrate.
Song et al. derived the zinc coating elasto-plastic properties from load-indentation response using the analytical algorithm by Dao et. al. [13].
All the above factors lead to different contact and indentation situation than the typical indentation test.

The mechanical properties of PEEK material are shown in Table 1.
Table 1 Mechanical properties of PEEK (#VICTREX©450G).
He found that the balance between these two factors governed the failure patterns under contact loadings [6].
However, the key factors are still unclear.
This feature is not affected by rotation speeds.

A summary of factors of rate of acidic attack and protective measures was given by Vladimir Zivica[4].
Both bond and flexural strength tests were conducted, according to Standard for Test Method of Mechanical Properties on Ordinary Concrete, GB/T 50081-2002, China, using a hydraulic universal material testing machine (WE-60) with a capacity of 300 kN.
This also proves that the presence of boric acid does not significantly affect the property of concrete.
The effect of boric acid sludges containing borogypsum on properties of cement.
Factors of rate of acidic attack and protective measures.

These properties make HSS more difficult to grind than other steels, especially when using conventional aluminium-oxide wheels.
The fatigue properties of punching tools are determined not only by the HSS material properties (e.g. carbide and inclusion contents, phase transformations) [1] but also by the thermophysical properties of the grinding process (undeformed chip thickness, wheel topography, energy partition, etc.), which affect the grinding temperatures.
For thermal analysis of grinding, it is of major importance to understand the factors which affect the grinding temperatures.
Specific grinding energy depends on numerous factors, such as sharpness of the grinding wheel, the grindability of the workpiece material, undeformed chip thickness, cooling-lubrication, etc.
The generation of tensile residual stress is strongly dependant on workpiece properties, in particular material yield stress.

They provide a sufficient level of the briquette mechanical properties.
The role of binders in the technology of briquetting is great, since these substances provide the strength properties of briquettes [2].
Since the materials for briquetting are very diverse, every time the problem arises of bringing evidence of the briquetting process efficiency and achieving the necessary briquettes strength properties.
Methods for the determination of mechanical strength).
In briquetting practice, it is known that denser briquettes, as a rule, have better mechanical properties.