Stress analysis model for un-bonded umbilical cables
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Abstract:
For the optimization design and strength evaluation of the umbilical cable, the calculation of cross section stress is of great importance and very time consuming. To calculate the cross section stress under combined tension and bending loads, a new integrated analytical model of umbilical cable is presented in this paper. Based on the Hook's law, the axial strain of helical components serves as the tensile stress. Considering the effects of friction between helical components, the bending stress is divided into elastic bending stress and friction stress. For the former, the elastic bending stress, the curvature of helical components is deduced; and for the latter, the shear stress before and after the slipping of helical components is determined. This new analytical model is validated by the experimental results of an umbilical cable. Further, this model is applied to estimate the extreme strength and fatigue life of the umbilical cable used in South China Sea.Keywords:
Slipping
Tension (geology)
Stress–strain curve
Based on the direct tension test, the characteristics of tension stress-strain full curves of steel fiber reinforced self-stressing concrete were investigated. For the convenience of calculation, ascending branch was simplified into a direct ratio formula and descending branch was simplified into two straight lines divided by knee point. The whole tension strength of steel fiber reinforced self-stressing concrete is a combination of tension strength of matrix and the self-stress value; the strain of knee point is defined to 500×10~(-6), and a formula for stress of knee point is suggested. The simplified curve based on the experiment provides a convenience for the analysis of stress and strain of steel fiber reinforced self-stressing concrete structures.
Tension (geology)
Stress–strain curve
Fiber Reinforced Concrete
Strain (injury)
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Tension (geology)
Section (typography)
Bend radius
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In order to solve the slipping problem between the aluminum strip and the tension roll,according to the operation characteristics of the aluminum strip hot rolling mill,the working status and the force situation of the tension roll are analyzed and the friction torque between the strip and the tension roll is calculated. The best time point to disconnect the tension roll motor's cluth is found by comparing the friction torque with the unloaded torque of the tension roll and checking the setting tension between rolls,thus the slipping is prevented effectively. This method is used in a practical project and receives good effect.
Slipping
Tension (geology)
Rolling mill
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Through analysis of elastic slipping of the belt conveyor and the slipping principle,the specific reasons for the conveyor slipping of SFZCX125 bean curd stick forming machine were known,and the countermeasures were put forward to solve this problem.
Slipping
Belt conveyor
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This paper presents analysis for the slipping phenomenon in automobiles; the parameters affects slipping of automobiles are discussed. An analytical equation is constructed to relate all factors affect slipping ratio. Some relations are predicted to show the factors affect the slipping in automobiles. It is found that the parameters affect slipping can be summarized as: radius of curvature of the curve, angle of the curve (slope), RPM of the tire, radius of the tire in addition to the nature of the road. It is found that: as the normal acceleration increases the slipping ratio decreases, as the RPM of the tire increase the slipping ratio increases and as the radius of the tire increases the slipping percent increases. It is obvious that as the path slope (tan θ) increases the slipping value decreases. It is noticed that: as the radius of curvature increase the slipping % decrease which is logic, since the slipping on straight dry path is nearly close to zero. Also it is noticed that: as the tire radius decreases the slipping % increases.
Slipping
Radius of curvature
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Abstract The article describes the purpose of anti-slipping spikes, which are set into tire treads of vehicles. The advantages and disadvantages of using anti-slipping spikes are revealed. The assessment of the destructive effect of the use of anti-slipping spikes on the road surface is given. The inability to simultaneously solve the problems to ensure maximum adhesion of the vehicle’s wheel to the road surface and to minimize the destructive effect of anti-slipping spikes on this surface actualize the development of an adaptive anti-slipping spike. Unlike traditional anti-slipping spikes, the pin of the designed device is retractable. The article presents the variants of the design of the developed adaptive anti-slipping spike for vehicle tires.
Slipping
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Tension (geology)
Pure bending
Compact tension specimen
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It is introduced a new test method for measuring the uniaxial tension complete stress-strain curve of concrete using a glued double-plated grip manner.The results show that it is a simple and reasonable tension test method characterized by its convenience,uniform stress distribution.
Tension (geology)
Stress–strain curve
Uniaxial tension
Strain (injury)
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The paper gives a vectorial treatment of a simple friction-twisting situation in which a 'yarn' passes over a moving belt in a slipping mode in a straight-line path with constant frictional increment. The treatment leads to theorems concerning the asymptotic values of torque, equal to that in the hypothetical non-slipping rotational mode, and tension change. Comments on complexities of the real friction-twisting situation in texturing are made.
Slipping
Mode (computer interface)
Constant (computer programming)
Tension (geology)
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This paper aims to set up the ball systematic slipping model and analyze the slipping characteristics caused by different factors for a ball screw operating at high speeds. To investigate the ball screw slipping mechanism, transformed coordinate system should be established firstly. Then it is used to set up mathematical modeling for the ball slipping caused by the three main reasons and the speed of slipping can be calculated. Later, the influence of the contact angle, helix angle and screw diameter for ball screw slipping will be analyzed according to the ball slipping model and slipping speeds equation and the slipping analysis will be obtained. Finally, curve of slipping analysis and that of mechanical efficiency of the ball screw analysis by Lin are compared, which will indirectly verify the correctness of the slipping model. The slipping model and the curve of slipping analysis established in this paper will provide theory basis for reducing slipping and improving the mechanical efficiency of a ball screw operating at high speeds.
Slipping
Ball (mathematics)
Ball screw
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