Search results

The impact can be direct or indirect via punch wear. [4] Geometry and quality characteristics of a fine blanked part depend on a variety of influencing factors.
One of those material properties is micro hardness.
Especially the steel temperature during a forming process is crucial for the mechanical properties of the steel [14].
In: Materials Science Forum Vol. 818 (2015), pp. 264-267 [8] Bubphachot, B.: Microstructure affecting cutting quality in fine blanking process.
Doctoral thesis, RWTH Aachen University, 2002 [14] Merklein, M., Lechler, J.: Investigation of the thermo-mechanical properties of hot stamping steels.

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.

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

The morphologies and microstructures of the brazed wires were observed and the comprehensive mechanical properties of the brazed wires were tested.
Mechanical Properties of the Brazed Diamond Wire.
In order to evaluate the changes of mechanical properties after brazing, the tensile strength, extensibility, torsional strength and bending strength of the brazed diamond wires were measured on a universal material testing machine, with the same tensile speed of 1 mm/min.
In order to appraise the bending properties of the brazed wires, the wires used in experiments were bended in different directions to a certain degree of arc and then were observed under the micro-scope.
Therefore, in order to obtain a slice with low damage, little scratches and high-precision surface shape, the diameter size variation of the brazed diamond wire is an important factor affecting the cutting quality and must be controlled in a very small range of variation.

Flammability of polymer materials depends first of all on chemical structure of polymer and physical factors affecting the burning.
This means that the coating after foam generation prevents the approach of air to insulation and so it retards the speed of flame propagation and at the same time it also reduces the surface temperature of plastics what is in case of softened PVC approximately below 160 - 180 °C. [2] The foam formed on cable systems must correspond to desired purpose [2]: - must be formed at lowest possible temperatures, - must resist as long as possible to mechanical acting of the flame, - must exert greatest possible elasticity, - must be strong, viscous and tenacious at lower thickness, - must allow escape of gases generated by thermal degradation of insulation under the coating, - must preserve the cable sheath at melt efflux on the coat surface, - must resists to defined mechanical loading without damage, - must attain desired humidity.
The foam has often the expansion factor even 1:50, i. e. from 1 mm thick coating the insulating foam 50 mm in thickness is formed. [3] Measurement of heat flux by radiation panel This instrument was constructed for experimental tests on the basis of experience gained from numerous professional consultations and comparison of existing methods with the aim to determine the initiation of material ignition in dependence of the heat flux rate.
However, PVC as well as the other polymer materials are subjected to degradation within their life cycle, which is caused by physical, chemical and biologic effects which exert a lasting influence upon their properties. [7] Ageing of insulation layers of cables significantly affects also their fire resistance, as proved also by the test results.

The Drive Control System of Micro Logistics Electric Vehicle Jianbao Zhang1,a, Chunguang Lu 2,b and Chengqun Li 3,c 1College of mechanical engineering, Hebei United University, Tangshan，Hebei, China 2College of mechanical engineering, Hebei United University, Tangshan，Hebei, China 3College of mechanical engineering, Hebei United University, Tangshan，Hebei, China a623004486@qq.com, bjxlcg@heut.edu.cn, clcqts@vip.sina.com Keywords: Electric Vehicles, Drive Motor, Drive Position Abstract.
Not only because of the energy problem, but also for it’s many excellent properties.
Choosing the suitable motor is one of the important factors to increase the cost performance of all kinds of electric vehicles.
In addition, its speed is not affected by the limitation of mechanical commutation.
In rear traction is relatively small, however, there is small space inside [5], but it doesn't affect indoor logistics demand.

Matrices , , , and vectors , are constructed on the base of corresponding matrices and vectors of local factors , , , , , , finite element (FE) matrices and vectors , , , , , (computed using quadrature of optimum accuracy).
(4) Computational models constructed by authors adequately reflect the geometric-stiffening and inertial properties and load parameters of structures and foundation of a high-rise building.
Coefficients of soil reaction are defined on the base of static properties of soil foundation for permanent, temporary, snow and wind loads (Fig. 2).
Determination of the natural frequencies and mode shapes of mechanical systems are perhaps the most informative verification samples, integrating many factors and parameters of computational model and, at the same time, allowing to detect corresponding difference.
Hughes, The Finite Element Method: Linear Static and Dynamic Finite Element Analysis (Dover Civil and Mechanical Engineering), Dover Publications, 2000

Among all kinds of environmental geological factors, the water permeability has the most significant influence on grottoes.
The more diluent solvent was added in 6# and 7#, the volatile and shrinkage were increased more. 8# added filler, so its shrinkage and weight loss were relatively smaller. ② Mechanical properties of materials(Fig. 1 & Fig. 2) Fig. 1.
The mechanical properties of test scheme 2 were higher an order of magnitude compared with scheme 1, which were all above 10MPa.
Thermal properties of materials (50°C).
The shrinkage and weight loss rate of 11 and 12# were too larger. ② Mechanical properties of materials Within limits, the strength of the material was increased as the curing time extended.

They have a wide temperature range, high chemical resistance against corrosive media, while having higher thermal protection properties.
The purpose of this research is also to study the features of the physical and technical properties of basalt fibers when changing modes of pre-mechanical and thermal treatment when using them as a reinforcing component.
These features sharply change the physical and technical properties of the fibers, which affects the basic characteristics of the materials made on their basis.
Building materials and products for the exterior insulation of the walls of residential buildings using ventilated facades must have appropriate thermophysical and physical-mechanical properties.
The insulation used in the structures of the exterior insulation of the walls of buildings is subjected to such operational factors as the alternating temperature and humidity regime; capillary and diffusion moisture; the effects of wind loads, self-weight mechanical loading, and so on.

It is necessary to study in detail its behavior and properties to decrease its cost and increase its performance.
Concretes produced with Portland cement and Eco-cement were mixed with gravel, limestone, quartz and molten slag aggregates to compare its properties.
The rest of the tests presents similar results and could not be considered as outstanding factors to affect the concrete strength.
Unfortunately, the molten slag has only 2 main physical properties to accomplish on its JIS standard.
Early, in: Importance of mechanical bond between cement paste and aggregate, edited by R.K.