Papers by Keyword: Tension

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Authors: Fa Zhang, Li Min Jin, Bao Zhong Sun
Abstract: As one new kind of 3D textile structural composite which has a strong potential in the application field of structural engineering, the mechanical behavior of 3D angle-interlock woven composite (3DAWC) needs to be extensively investigated. In this paper, a comparative experimental analysis of 3DAWC between quasi-static tension and three-point bending loading conditions were described, which has not been well studied so far. To evaluate the mechanical properties of the 3DAWC, the stress-strain/deflection curves were obtained under quasi-static tension and three-point bending loading, respectively. Furthermore, the Young’s modulus and peak values in stress were also compared. All of these results show that the 3DAWC has good integral performance.
Authors: Tan Xiao, Yu Ren, Ping Wu, Liao Kin
Abstract: Tensile strength distributions of multi-walled carbon nanotubes (MWNTs), single-walled carbon nanotube (SWNT) ropes and sub-bundles are studied by statistical approach based on the experimental data sets. It shows that the distributions can be adequately described by a two-parameter Weibull model. Considering further their nonlinear stress-strain behavior, the force-strain relation and tensile strength of SWNT bundles are studied. The Weibull modulus of the sub-bundles in a SWNT bundle can be estimated in terms of the maximum sustained force and the failure strain of the bundle. A SWNT bundle was subjected to tensile testing using a nano-mechanical testing device. The result suggests that the nonlinear behavior of SWNTs does affect the force-strain relation of SWNT bundles, mainly at large strain.
Authors: Jian Bing Han, Shi Zhe Liu, Ping Li, Zong Yao Yao, Jin Cang Mi
Abstract: The PLC-based tension training system consists of three-phase asynchronous motors, programmable logic controllers (PLC), inverters, touch screen and sensor. Taking PLC as the controller, the system uses two sets of three-phase asynchronous motors to complete the delivery and winding of fibers, uses two inverters respectively to control the operation of the motors, and measures the fiber tension through tension sensor, and then feeds back the result to the PLC. Besides, by the touch screen control interface design, the system can achieve single motors inching, winding, and unwinding, two motors simultaneous operation and other operation modes. PID, fuzzy PID, genetic algorithm based PID and other algorithms can be used in the tests of the system. The PLC-based tension training system is of great help for enhancing the hands-on ability of college students or junior technical staff.
Authors: Antony T. McTigue, Annette M. Harte
Abstract: This paper presents the results from an experimental test program conducted on commercially available oriented strandboard (OSB) panels and statistical analyses of the results. Standardised testing was used to determine the short-term behaviour of OSB/3 panels subjected to tension loading. A variety of thicknesses sourced from three different producers were used. Analysis of the results indicate that a quadratic expression in the form of  = a2 + b provides the best description of the relationship between stress (and strain ( up to the point of failure. It has also been shown that the coefficients a and b of the quadratic regression equations are negatively correlated to each other. Anderson-Darling goodness-of-fit tests were conducted on the results for tension strength and modulus of elasticity (MOE). The results indicate that the tension strength and MOE come from populations that follow either normal or lognormal probability distributions.
Authors: Wen Huang, Zhong Wei Huang
Abstract: A statistical constitutive model, which takes account the effect of strain rate, was presented to describe the stress-strain relationship of brittle fiber bundles. To verify its reliability, tensile tests on two kinds of brittle fibers: glass fiber and SiC fiber, were carried out at different strain rates, and the stress-strain curves were obtained. It was found that the modulus E, the strength and the fracture strain of these fiber bundles all increase with increasing strain rate. The simulated stress-strain curves, derived from the constitutive model, fit the tested results well, which indicates that the model is valid and reliable.
Authors: Qing Yang, Bai Lin Zheng, Kai Zhang, Jian Xin Zhu
Abstract: An Elastic solution for functionally graded cantilever beam with different modulus in tension and compression subjected to a uniform pressure on the lateral surface is investigated. The elastic modulus of tension and compression vary with the thickness as an arbitrary function, respectively, which makes the solution have a broader range of applications than the homogeneous ones. When the tension and compression modulus have the same constant value, the solution degenerates into the classical one of the cantilever beam.
Authors: Shi Bin Liang, Hong Lei Yang, Xue Peng Miao, Min Cao, Ming Chang
Abstract: Snow and ice disasters on power system safe and reliable operation of the transmission line has a great threaten.An overhead conductor tension sensor based on fiber Bragg grating is developed.The sensor contains a strain sensor module and a temperature compensation module which can offer temperature compensation for strain sensing module.The sensor connected to the tower and the insulator with metallic clamps.If there is ice on the transmission line,the tension of the sensor sensing module of the center wavelength will corresponding change,and the ice condition of the transmission wires can be reflected by the center wavelength variation.Experiment indicates that the tension sensitivity coefficient of the sensor is 9.8 pm/kN,the repeatability error is 1.78% FS,the nonlinear error is2.4% FS, the hysteresis is 1.5% FS.
Authors: Yun Tong
Abstract: Tension and elongation of warp is the key factors among various technical parameters in warp sizing process in textile production. Analysis of composition of tension & elongation in different zone on sizing machine.By means of mechanical device and electric sensor, as well as frequency conversion speed regulator controlled by PLC, the sizing warp tension &elongation has been regulated precisely. The principles and features of various sensors and their application on modern sizing machine regarding automation have been discussed in this paper.
Authors: Cun Long Zhou, Zheng Yi Jiang, Guo Dong Wang, Dong Gang Xie, Yong An Zhang
Abstract: In this paper, a new method considering the combination of tension and deformation curvature which results in less deformation energy under a certain elongation is presented at the first time. The calculation results show that when the elongation is less than 1 %, the tension which is about 1/6 yield stress will consume less energy. If the tension decreases from 1/4 to 1/8 yield stress, the deformation energy of strip with yield stress of greater than 450 MPa decreases significantly. This study can help determine the processes parameters of strip tension levelling effectively.
Authors: Xiu Juan Pan, Fei Xie, Ming Zhu Sun
Abstract: Based on the catenary equation, we deduced the gravity and rotation inertia formula of catenary, and obtained the tangent angle of each point on the rope , the tension of the rope and other mechanical parameters. Then we discussed two kinds of situation and calculated all of the corresponding parameters with the Mathematica, and analysis the trend of these mechanics parameters in detail and the numerical results demonstrated the properties obtained. The methods we employed in calculation and analysis can be applied in analyzing the properties of tension and stress of dangling cables in engineering.
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