Search results

This is that alumina affects the strength characteristics of proppants, and silicon oxide affects the elasticity when molding material granules.
It is these factors that do not allow widespread use of this proppant.
The disadvantages of this type of proppant are considered: low mechanical strength (6500 psi or 44.82 MPa) and high bulk density (more than 1700 kg/m3).
These factors and intermittent cyclic loading can reduce the fracture toughness of proppants.
Preparation and properties of resin coated ceramic proppants with ultra light weight and high strength from coal-series kaolin, Applied Clay Science Volume. 2019

Multiscale modeling combining Digital Material Representation and Crystal Plasticity enables to gain a better fundamental understanding of mechanical response and microstructure evolution of precipitation strengthened austenite and ferrite of three microalloyed steel grades.
Introduction Thermomechanically processed microalloyed steels with an excellent properties such as high strength, good toughness and weldability, lower ductile to brittle transition temperature, good resistance to hydrogen-induced cracking etc., have been a great commercial success as the structural materials for many years [1].
Although, it was reported in the literature that strain rate has an effect on SIDT [3] (at higher strain rates SIDT ferrite nucleates not only on prior austenite grain boundaries but also in the austenite grain interiors) in the case of present work, the critical factor for dynamic transformation is strain – i.e. energy accumulated in the material – when sufficient level of deformation isn’t obtained, transformation will proceed during cooling after deformation and will be “static”.
Effect of strain-induced precipitation and solid solution strengthening affect the state of austenite and provide possible nucleation sites

The microwave devices made of ME materials can conquer the disadvantages of those made of two traditional materials, i.e. the tuning speed of ferrite microwave devices is relatively slow and ferroelectric microwave devices cause large microwave loss and low quality factor.
They have developed a tunable microwave resonator with a 100MHz maximum resonant frequency shift in electric field of 8kV/cm, a tunable microwave filter with a 420MHz maximum resonant frequency shift in electrical field of 30kV/cm, the ME phase shifter, attenuator and delay lines, etc. [2-4] Considering such elements as magnetic anisotropy, stress anisotropy and demagnetized field etc., and the fact that the electric field induces mechanical stress on ferroelectric layers, which will further induce FMR frequency shift on ferrite layers, Bichurin et al. have carried out theoretical research in the electric field tuning FMR frequency shift [5-6].
However, in the process of designing microwave devices for engineering applications, electric field will deform the materials, and the deformation will change the magnetic properties of ferromagnetic materials, leading to the shift of FMR frequency, which will seriously affect the function of microwave devices.
Meanwhile, the electric field tuning magnetic property and the geometric parameters of ferrite are very important to ME microwave devices.
In this paper, we considered the change of the magnetic properties caused by electric field equals to that by magnetic field.

This is equal to the tool life improvement by a factor of 25%.
This means that the tool life increased by a factor of 13 times.
Clarification of these factors will be discussed in the next report.
It is inferred that a reason for the slight increase in the grinding force and the wheel wear when the strong alkali ion water was used as a diluting solution is because the vitrified bond was affected by the strong alkali ion water and weakened.
References [1] Yusuke Ikedo: Next-generation working fluid "ALCOOL" to make machining efficiency and environmental improvement, Mechanical Engineering, Vol.60, No.9 (2012) 66.

Yaw exciting force directly affected by the whole mechanical properties and its service life, and therefore it has an important significance to study the vibration characteristics of the wind turbine at yaw state.
Because the No.1, No.2 sensor was located in the front of generator and close to the rotor, so the similarity of vibration spectrum and static spectral affected by the vibration characters of rotor was related well.
Primary research for crosswind factor resulting in vibration of wind turbine ,J.
Mechanical Science and Technology for Aerospace Engineering, 31,5(2012),p.827-841 [10] MA Jianlong, WANG Jianwen, DONG Bo, at al.

Many scholars had done a lot of researches of concrete -filled steel tubular arch bridge to the structure’s mechanical behavior, selection form, creep performance and other static properties ,got a series of research results[6-7].
Damping is a key factor of structural dynamic characteristics, its value directly affects the size of the dynamic response.
Many studies showed that the structure's damping properties and stress state had a greater relationship, the value of the damping ratio was not fixed.

The hydraulic conductivity represents not only the properties of the porous medium but also the properties of the infiltrated fluid.
Intrinsic permeability on the other hand only describes the properties of the pores in the medium.
The previous works by the authors [2, 3, 4, 5] have studied the mechanical properties of enhanced porous concrete.
Also Crouch et al. [15] demonstrated that the constant head permeability would be a function of the pore properties.
References [1] Neville, A.M., Properties of concrete, England: Longman Group Ltd, (1995)

The structure and magnetic properties of the synthesis Mn1-xZnxFe2O4 with x=0-0.5 by step 0.1were studied.
C.O'handley, Modern magnetic materials: principles and applications, first ed., Wiley, NewYork, 1999. ].Nonetheless, the magnetic properties of nanoparticles unequivocally rely upon different factors, for example, preparation method, particle size, shape, and composition.
Magnetic Properties.
Magnetic properties of samples tested at room temperature (300 K).
Bsoul, Structural and magnetic properties of Cu–V substituted M-type barium hexaferrites, in: IOP Conf.

Therefore, the structure of the molten metal has an important influence on its structure and properties after solidification.
The change of the physical properties of the melt can indirectly reflect the change law of the melt structure.
Resistivity is one of the sensitive physical properties of the metal melt structure, and it reflects the transport properties of electrons.
The influence of the local structure of the body, molecular dynamics can simulate many properties of the metal melt, and it has huge application prospects in revealing the structure evolution of the metal melt, the amorphous tendency and the calculation of thermodynamic properties.
These results show that the cluster model can describe the structural properties of pure metal melts well.

After the integration of large-scale renewable energy, more uncertain factors are brought to the power system, which badly influences system’s planning and operation.
The advantages of Copula function are as follows: 1) for auto-correlation properties, Copula function is more practical because it has many types of different correlation structure functions. 2) When the correct Copula function is chosen, the correlation coefficient calculated could accurately reflects the intensity level between two variables.
Generally, the usual mechanical power model of wind farm is as following [19]
The correlation among wind power, solar power and load cannot be ignored since it affects the power system’s planning and operation.