Search results

The mechanical properties of the prepared resins without filler were measured with a universal testing machine (UTM).
The viscoelastic properties of the epoxy compositions were analyzed by dynamic mechanical analysis (DMA Q800, TA Instruments).
The mechanical properties of each composition were measured by UTM.
Maximum loss factors of MHHPA-C, and MTHPA-C are not as clear as that of NDA-C shown at 210.8°C in Fig. 6c and Table 4.
The mechanical and thermal properties of the prepared compositions were studied with DSC, DMA, and TMA.

There are environmental factors such as ultraviolet light, temperature and moisture which affect mechanical properties very slowly in the long period of service.
Currently the standard tests used by industry to evaluate the long-term performance of composites involve only one or at most two influencing factors.
However in-service composites are subjected to aging by a combination of factors including heat, ozone, oxygen, ultraviolet light and liquids.
The effects of the interactions between these factors on aging are essentially unknown.
The mechanical properties are listed in Table 1.

Tunnel mechanics mainly depend on joints properties in layered and jointed rock mass, and most of the present methods adopted in numerical analysis are distinct element method.
An orthogonal design of uniaxial compression tests was simulated on eighteen groups of jointed rock specimens having different geometric and mechanical properties using RFPA2D (Rock Failure Process Analysis) code in [5].
In order to study on the effect of joints on tunnel mechanics, three factors including dip and thickness of joints and lateral pressure coefficient are considered in the finite element model.
Combining to the Gaixiaba tunnel, considering the jointed properties such as dip angles, distances and lateral pressure coefficient, the finite element models are made.
Numerical investigation on the sensitivity of jointed rock mass strength to various factors.

Comparing with the coatings of 1Cr18Ni9Ti, Ti and Al, the coatings of Cu have much better heat-transfer properties.
In the magnetic refrigeration machine, the property of heat exchange response to the efficiency of refrigeration.
Film adhesion is affected by the multiple factors of Van der Waals force, diffusion, mechanical lock, electrostatic attraction and chemical synthesis influence.
From the above analysis, it can be seen that the film adhesion is affected by the multiple factors of sputtering time, sputtering power density and target materials.
(2) The adhesion between Cu and Gd is very bad and they are bonded together only by mechanical link.

Because it has superior property such as high intensity, high hardness, resistance to abrasion, resistance to corrosion, resistance to high temperature and light weight[1].
Under normal circumstances, utilizing regression analysis can get more precise model when there is less affecting factors and clear regression model.
During process of engineering ceramics electro-spark machining, Factors that most affect surface roughness which is attainable are peak current, pulse width and pulse interval.
Removing these redundant attribute and rules won’t affect original category effect.
[2] Liu Yonghong, Yu Lili, Xu Yulong, Study On Spark Discharge Channel Insulating Properties Of Engineering Ceramics Thermodynamic[J].

Roadway bolt supporting, which relates the equations such as ground stress, mechanical property of surrounding rock and bolt supporting structure, is an engineering problem of rock and structure coupling.
Coal seam roof and floor mechanical properties of stress measurement based Kailuan Mine identified in the report with the tectonic stress field, as shown in Table 1.
Using numerical simulation method to determine the parameters bolting, coal, and the physical properties of surface mechanical properties of joints is very important to select the parameters, and it directly affects the determination of bolting parameters.
KN =fEh In the formula, f—Control access to the coordination of factors, the general values between 0.05 and 1; E—The elastic modulus of coal, if the joint surface on both sides is different materials, the smaller is available; h—Characteristic contact length, depending on the geometry of the special nature of the problem, in the three-dimensional graphics, they should be equal to the length of a typical contact with the target (that is, the square root of target surface), or a typical cell size.
[4] Ma Qihua, “Bolting support technology development prospect and restricting factors,” Coal Geology of China, vol. 24, pp. 25–30, 1998

Study on effect of viscoelastic properties on surface roughness uniformity in abrasive flow machining for plate surface Xuanping Wang1,*, Youzhi Fu2 and Hang Gao3 1,2,3 School of Mechanical Engineering, Dalian University of Technology, No. 2 Linggong Rd, Dalian, PR China, 116024 1xpwang@dlut.edu.cn, 2fuyouzhi120@163.com, 3gaohang@dlut.edu.cn Keywords: Abrasive flow machining; Viscoelasticity; Material removal; Surface roughness Abstract.
It could be concluded that the viscoelastic properties of abrasive media play the dominant role for the inconsistent material removal in abrasive flow machining process.
Although the mechanism behind this phenomena is unknown, it's a well-accepted consensus that the viscoelastic properties of the AFM media play an important role.
In this paper, the viscoelastic properties of the abrasive media are incorporated to understand the mechanism of inconsistent material removal in the AFM process.
Table 1 Computational meshes for planar 4:1 contraction flow Nodes Elements Δxmin/H2 Δymin/H2 88369 174080 0.01563 0.01563 The contraction flow with different rheological parameters are studied by varing the values of Wi number, in order to explore the prominent factor which affects the consistency of material removal.

Modal Analysis of Gear Considering Temperature Based on ANSYS Yuan Hui Quan1,2,a, Ri Chol Nam2,3,b 1College of Science,Northeastern University, Shenyang, China 2School of Mechanical Engineering and Automatization, Northeastern University, Shenyang, China 3Department of Resource Develop Mechanical Engineering, Pyongyang University of Mechanical Engineering,Pyongyang, D.P.R.Korea ayuan_hq@163.com, bzhangliang545238@163.com Keywords: spur gear; temperature; thermal effect; ANSYS.
Generally speaking, in the course of working , due to loads or objective factors ,most of the power machinery cause changes in the dynamics of components and systems.
Temperature leads to thermal stress , thermal deformation and changes in material properties, therefore, affect the vibration characteristics .
Can be considered the natural frequency change due to temperature change has two factors; one is the material properties with temperature changes, the other is the thermal stress.
Here, A is the natural frequency without considering temperature change and thermal stress, B is the natural frequency only considering the temperature-dependent material properties, C is the natural frequency only considering　thermal stress，D is the natural frequency considering the temperature-dependent material properties　and thermal stress.

External factors, like excessive ultraviolet radiation (UV) from sun exposure and pollution, contribute to signs of skin aging or as known as photoaging, which is accompanied by various visible morphological changes and invisible physiological dysfunction [1,2].
RSV properties must be considered since this compound demonstrated low solubility (soluble in water only by 30 mg/L), chemically unstable, rapid degradation, and extensive metabolism, resulting in poor bioavailability [3,8-9].
This phenomenon causes a decrease in the mechanical energy for dispersion [15].
The authors recommend Formula 1, as the best formula, due to its good characteristics, physicochemical properties, and skin penetration profile in vivo.
Souto, “Evaluation of the influence of process parameters on the properties of resveratrol-loaded NLC using 22 full factorial design,” Antioxidants, vol. 8, no. 8, 2019

Primary objective of this work is to predict the temperature profile of heat affected zone in a maraging steel weld.
For further analysis, extensive work needs to be carried out to evaluate the high temperature properties of the maraging steel.
These properties can be incorporated into the simulation model for better prediction of HAZ temperature profiles.
[2] ASM Handbook, Volume 1: Properties and Selection: Irons, Steels, and High-Performance Alloys, 10th Ed. (1990)
Pellisier, An investigation of the mechanical properties and microstructure of 18Ni250 Maraging steel weldments, Trans.