Papers by Keyword: Frictional Resistance

Abstract: The bolt’s load transfer differential equation has established according the stress equilibrium in a small section of a bolt and load transfer mechanics. And according the rock mass deformation before and after bolt assembling, the rock bolt’s load transfer equation has gained. In this paper, from later researching achievement, the radial displacement function of brittle wall rock for tunnel is gotten. And combining the radial deformation of tunnel wall rock mass, the axial force and friction resistance of rock bolt have gotten in brittle wall rock mass. Through analyzing the stress distribution feature and stress distribution tendency and affection factors, the affection factors to anchoring results is the dilatancy angle. And through the studying, it is show that the axial force and shear stress of rock bolt are bigger with the dilatancy angle increase

Abstract: During beating-up process in plain weaving, the weft is resisted by two forces: frictional resistance between the weft and the warp, and elastic resistance from the warp. In the process of 3D weaving, several ends of warps are inserted in multiple sheds simultaneously, the resistance force of 3D weaving is much bigger than that in traditional weaving. A beating-up mechanism should work out the range of resistance, since the movement can only be realized when the beating-up force exceeds or equals the resistance. A theoretical foundation for 3D weaving mechanism is provided in this paper by calculating the resistance force in flat weaving using integral method and then deriving the resistance in 3D based on its structural characteristics.

Abstract: Experiments were carried out to learn about the frictional resistance of gas flow in vertical helically coiled pipe. The expression of friction factor was established and the formula used to calculate the frictional resistance of gas flow in vertical helically coiled pipe was defined based on partial data got from different experiment conditions. The calculating formula was verified by the experimental data. The results show that the formula is accurate enough to calculate the frictional resistance of gas flow in similar operating conditions.

Abstract: Based on the heat and mass transfer theory and characteristics of the FLUENT software, a numerical simulation platform had been developed to study the heat exchange and flow situation of gas-liquid two-phase flow in vertical helically coiled pipe. The frictional resistance of gas-liquid two-phase flow in the pipe was investigated by this platform. The results show that frictional pressure drop is relatively small under high pressure condition and increases with the increasing gas quality. This platform could provide a good support for the design and research of vertical helically coiled pipe.

Abstract: The frictional resistance of gas-liquid two-phase flow in vertical helically coiled pipe was investigated by means of experiment and numerical simulation. The resistance data in the conditions of different gas-liquid ratio was obtained. A numerical simulation platform was developed based on the heat and mass transfer theory and characteristics of the FLUENT software. Comparing and analyzing the results of experiment and simulation, it indicates that there is good computational accuracy of the numerical simulation platform, and the platform can provide a good support for the design and research of vertical helically coiled pipe.

Abstract: Experiments were carried out to learn about the frictional resistance of gas-liquid two-phase flow in vertical helically coiled pipe. The expression of friction factor is established and the formula used to calculate the frictional resistance of gas-liquid two-phase flow in vertical helically coiled pipe is defined based on partial data got from different experiment conditions. The calculating formula was verified by the experimental data and the result indicates that the formula is accurate enough to calculate the frictional resistance of gas-liquid two-phase flow in similar operating conditions.

Abstract: Static load tests were carried out with Osterberg method on 3 bored piles formed in Liao River Bridge. Bearing capacity, base resistance and frictional resistance were obtained before and after base grouting. Based on the test results, the ultimate bearing capacities of piles were increased for 14.74%~43.87%, that of pile bases were increased for 89.57% ~ 163.49% and the frictional resistances were most increased for 31.20%. The pile bearing behavior was improved. Not only base resistances were improved after grouting, but also frictional resistances were improved by bettering the characteristics of soils and interfaces between piles and soils. After grouting, pile base resistance ratio of pile bearing capacity increased, and some frictional piles changed into end-bearing frictional piles. The frictional resistance of lower pile increased more than that of upper pile after grouting. The slurry penetration height of base grouting had a certain range, which was affected by quantity of mortar intrusion, grouting technology, grouting pressure and geological structure.

Abstract: In hard plastic extruding course, the frictional resistance among particles and between the particles and mould make the extruding pressure 4 to 20 times larger than soft-plastic extruding. This paper study the plasticizer mechanism of water-soluble plasticizer in hard plastic extruding course, and emphasize that in this course the plasticizer liquid film not only have good combination with ceramic particle, but also has high yield strength so that the plasticizer liquid film is difficult to slide and be pulled thin. The compound usage of different plasticizers which can improve the effect of plasticizer enhances the quality of the final molding body.

Abstract: This paper presents the results of an investigation on the force transfer mechanism in an embedded column base of a composite structure. In the experimental program, eighteen push-out specimens were tested. The factors influencing the mechanism of force transfer were the amount of confining reinforcement, compressive strength of concrete, and diameter of stud connectors. The results of experiment indicated that force transfer could be characterized into two stages, and the factors governing each stage were identified. The first stage was governed by the bond strength between the steel column base and the concrete. The second stage begun after chemical debonding and was governed by the shear strength of stud connectors as well as the frictional strength between the steel and the concrete. Based on the experimental results, the equations to estimate the bond strength, the friction strength, and the shear strength of stud connectors were proposed. The load carrying capacity of an embedded steel column base could be predicted by taking the sum of the shear strength of stud connectors and the friction strength. The predicted load carrying capacity was found to agree well with the experimental results over various range of concrete stress.