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Journal articles on the topic 'Torsion bar'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 March 2023

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1

Zhou, Hai Jun, Hong Hong Huang, and Hua Zhang. "An Experimental Study on Mechanical Behavior of Superelastic NiTi Shape Memory Alloy Bar Subjected to Torsion." Advanced Materials Research 163-167 (December 2010): 3992–95. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3992.

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An experimental study on mechanical behavior of superelastic NiTi shape memory alloy (SMA) bar subjected to torsion was made. The SMA specimen was in round bar shape, material phase was austenite and stress mode was torsion. The test was carried out by applying repeated cyclic uniform torsional load. Strain rate, strain amplitude and number of cycles were considered as test parameters. The test was described and analyzed in terms of three fundamental mechanical quantities: secant stiffness, energy loss per unit weight and equivalent damping. The test results show that SMA bar subjected to torsion, have great potential for application in seismic devices due to their considerable superelasticity and stable cyclic behaviors.

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2

Ha, Kwangtae. "Innovative Blade Trailing Edge Flap Design Concept using Flexible Torsion Bar and Worm Drive." HighTech and Innovation Journal 1, no. 3 (September 1, 2020): 101–6. http://dx.doi.org/10.28991/hij-2020-01-03-01.

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In this paper, a simple but effective trailing edge flap system was proposed. This preliminary concept uses a more practical and stable actuation system which consists of a motor-driven worm gear drive and flexible torsion bar. The flexible torsion bar is designed to be easily twisted while keeping bending rigidity as a sup-port and the worm gear drive not only provides a high torque to overcome aero-dynamic forces on the flap area and the torsional rigidity of the support bar, but also acts as a brake to avoid instability due to the high torsional flexibility of sup-port bar. A preliminary level design study was performed to show the applicability of the new trailing edge flap system for wind turbine rotor blade or helicopter blade.

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3

Fang, Shu-juan, and Qing-tao Lv. "EPS Sensor Torsion Bar Design and Structure Analysis." MATEC Web of Conferences 232 (2018): 04051. http://dx.doi.org/10.1051/matecconf/201823204051.

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Torsion bar design is very important on Electrical power steering(EPS) development. The mathematical model and structure for torsion bar are developed, and the torsion bar outer spline is cancelled based on the automotive parameters. This kind of structure leads to cost down and time saving on torsion bar manufacturing process. The 3D model and finite element on sub-EPS(torsion bar, input shaft, output shaft) are developed, and then do the contact nonlinear analysis based on interference between torsion bar and output shaft. The EPS structure and test reliability according to function test and durability test are verified and the test results are passed.

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4

Wang, Gang, Fang Wang, and Hong Chen. "Analysis on Static Stiffness of Synchronization Torsion Bar Based on Finite Element Method." Advanced Materials Research 466-467 (February 2012): 744–48. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.744.

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Synchronization torsion bar is a key part in independent and dependent impression mechanism which ensures synchronization motion at both ends of blanket cylinder. Due to frequent action of the mechanism in high-speed printing, synchronization torsion bar would cause huge impact torque so as to affect parallel shifting of blanket cylinder and uniformity of printing impression. Based on structure features and force of synchronization torsion bar, finite element model of synchronization torsion bar was established by adopting structural mechanics and finite element method, then static stiffness of synchronization torsion bar was solved by adopting principle of minimum potential energy. The result of computation shows that the maximum torsion deformation of torsion bar in X direction happens at the left connection point. Because the deformation is very small, the bar can meet the requirements that blanket cylinder.

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5

He, Zhuo Yu. "Simulation Analysis of Influences of Anti-Roll Torsion Bar on Vehicle Dynamics." Applied Mechanics and Materials 409-410 (September 2013): 1486–91. http://dx.doi.org/10.4028/www.scientific.net/amm.409-410.1486.

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In the secondary suspension of urban rail vehicles and high-speed passenger trains, combination of air springs and anti-roll torsion bar is widely used. However, in its practical use, cracks appear in the anti-roll torsion bar and vehicle curve performance is lower. Through analysis of anti-roll torsion bar, acceleration being taken into account, the dynamics models of anti-roll torsion bar and the vehicle itself are established. The results indicate that the combination of anti-roll torsion bar and rubber joints is superior to present a more reasonable anti-roll stiffness, to ensure better dynamic performance of the train, and also to lengthen the life of the anti-roll torsion bar.

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6

Huang, Zhi Qi. "Ant Colony Algorithm: an Application of Design Self-Balancing Torsion Bar." Advanced Materials Research 314-316 (August 2011): 1278–81. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1278.

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Using the improved Ant Colony Algorithm to optimize torsion bar diameter, and take the optimization results into practice. Results not only show the Ant Colony Algorithm is feasible and provides a new method choosing torsion bar diameter but also is satisfied.Based on maximum deformation energy and not exceeding the allowable stress values of a torsion-bar spring, the thesis builds the optimization model for the self-balancing torsion bar.

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7

Rao, Pin Yang. "Ant Colony Algorithm: A New Method Choosing Torsion Bar Diameter." Advanced Materials Research 339 (September 2011): 295–98. http://dx.doi.org/10.4028/www.scientific.net/amr.339.295.

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The torsion bar is one of the major parts of converter tilting mechanism and is widely used for light weight, large energy stored in unit mass, simple structure, convenient arrangement without maintenance demand, etc. Results not only show the Ant Colony Algorithm is feasible and provides a new method choosing torsion bar diameter but also is satisfied.Based on maximum deformation energy and not exceeding the allowable stress values of a torsion-bar spring, the thesis builds the optimization model for the self-balancing torsion bar.

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8

Furch, Jan, Quy Hung Nguyen, and Jiri Stodola. "Accelerated testing of track vehicle torsion bar." MATEC Web of Conferences 327 (2020): 03001. http://dx.doi.org/10.1051/matecconf/202032703001.

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The suspension system of track vehicles is often equipped with torsion bars. The torsion bar is a key element of the vehicle's suspension system. The service life of torsion bars depends primarily on the quality of the material used, the diameter of the torsion bars and the method of attachment and placement. In order to obtain the characteristics of the torsion bar, an experimental test stand was created on which accelerated tests were performed. Furthermore, a virtual model of torsion bar operation was created. The torsion bar was modelled using finite elements (FE part). Dynamic simulation was performed using MSC Adams software. Finally, the values measured in the accelerated tests and the results of simulations were compared. Comparing the values found, it was proved that this difference is not significant. This virtual model can be used to investigate the service life of torsion bars and to predict their service life.

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9

Ecsedi, István, and Attila Baksa. "Saint-Venant torsion of orthotropic piezoelectric elliptical bar." Acta Mechanica 233, no. 1 (December 20, 2021): 201–11. http://dx.doi.org/10.1007/s00707-021-03110-5.

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AbstractThe object of this paper is the Saint-Venant torsion of a solid elliptical cylinder made of orthotropic homogeneous piezoelectric material. We find the shape of the homogeneous orthotropic piezoelectric elliptical cross section which does not warp under the applied torque. The sizes of the orthotropic piezoelectric solid elliptical cross section, which has the maximum value of torsional rigidity for a given cross-sectional area, are also determined.

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10

Liu, Chun Jie, and Bing Shou Zhu. "Development of a Measuring System for Stiffness Evaluation of Micro Torsion Bar." Applied Mechanics and Materials 33 (October 2010): 190–94. http://dx.doi.org/10.4028/www.scientific.net/amm.33.190.

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For the micro torsion bar used in inertial navigation, the torsional stiffness should be evaluated precisely. A computer-controlled instrument for stiffness measurement based on static measuring principle was introduced for variant section micro bars, The main hardware of the system includes a precision motorized rotary stage and a torsion sensor. The stepping resolution of angular displacement is 0.00250, the measurement accuracy of moment is 0.05mN•m. The measurement software was programmed on the LabVIEW platform for virtual instrument. The measuring experiments indicate the device can be used for automatic testing of stiffness of the torsion bars with high accuracy and efficiency.

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11

Wang, C. Y. "Torsion of an Angle Bar*." Mechanics of Structures and Machines 24, no. 3 (January 1996): 283–94. http://dx.doi.org/10.1080/08905459608905265.

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12

Huang, Zhi Qi. "Optimization Design of Self-Balacing Torsion Bar Diameter." Advanced Materials Research 308-310 (August 2011): 2486–89. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.2486.

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The thesis builds the optimization model for the self-balacing torsion bar, On the basis of the Ant Colony Algorithm, designs the Ant Colony Algorithm procedure using C Language and optimizes torsion bar diameter. Results show the Ant Colony Algorithm is feasible and provides a new method choosing torsion bar diameter. The max difference value is 1.12% between optimizing results and theoretical results.

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13

Ecsedi, István, Ákos József Lengyel, Attila Baksa, and Dávid Gönczi. "Saint-Venant torsion of thin-walled nonhomogeneous elliptical tube." Multidiszciplináris tudományok 12, no. 3 (2022): 69–78. http://dx.doi.org/10.35925/j.multi.2022.3.7.

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This paper deals with the uniform torsion of thin-walled elliptical tube. The material of the tube is nonhomogeneous and it depends on one of the curvilinear coordinates which defines the cross section of thin-walled bar with closed profile. The approximate solution for the stresses, torsion function and torsional rigidity are obtained by the application of two extreme value theorems of linearized elasticity.

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14

Wang, Xin Gang, Yi Min Zhang, Y. F. Yan, and Bao Yan Wang. "Dynamic Reliability Sensitivity Analysis of Torsion Bar." Advanced Materials Research 44-46 (June 2008): 275–82. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.275.

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In this paper, the variation rules of strength, load, reliability and failure rate of mechanical components are studied with time, and a state equation model for dynamic reliability of mechanical components is established under random load. Meanwhile, reliability index is obtained by using Second moment method and perturbation method. Based on the reliability design theory and sensitivity analysis method, torsion-bar is taken as an example, and the dynamic reliability sensitivity of torsion-bar is extensively discussed and a computing method is presented for dynamic reliability sensitivity design. The variation rules of dynamic reliability sensitivity are obtained and the effects of design parameters on reliability of torsion-bar are studied. As a result, the proposed method provides theoretical basis for reliability design of torsion bar.

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15

Askandar, Nasih, and Abdulkareem Mahmood. "Comparative Investigation on Torsional Behaviour of RC Beam Strengthened with CFRP Fabric Wrapping and Near-Surface Mounted (NSM) Steel Bar." Advances in Civil Engineering 2019 (September 23, 2019): 1–15. http://dx.doi.org/10.1155/2019/9061703.

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Many researchers worldwide have extensively used fibre-reinforced polymer (FRP) strengthening materials and near-surface mounted (NSM) to enhance the shear and flexural strengths of reinforced concrete (RC) beams. However, studies on torsional strengthening are limited. Although a few studies have focused on torsional strengthening, none of them simultaneously investigated torsion with shear and/or bending moment. This study aims at demonstrating the behaviour of RC beams strengthened with FRP sheets (strips) with different configurations and NSM steel bars with different spacing that was subjected to combined actions of torsion and bending moment and making a comparison between them. Seven beams with a dimension of 15 × 25 × 200 cm were casted. One of the beams was not strengthened; three of them were strengthened with carbon FRP, and the others were strengthened with NSM steel bar. The angle of twist at torque intervals, first cracking torque, ultimate torque, and ultimate twist angle of the conventional and strengthened beams during the testing process are compared. Results show a significant improvement in the torsional performance of RC beams using carbon FRP and NSM steel bar. The test beams that were strengthened with CFRP wrapping showed better enhancement in the ultimate torsional moment as opposed to the beams that were strengthened with NSM steel bar.

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16

Sapountzakis, Evangelos J. "Bars under Torsional Loading: A Generalized Beam Theory Approach." ISRN Civil Engineering 2013 (March 21, 2013): 1–39. http://dx.doi.org/10.1155/2013/916581.

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In this paper both the static and dynamic analyses of the geometrically linear or nonlinear, elastic or elastoplastic nonuniform torsion problems of bars of constant or variable arbitrary cross section are presented together with the corresponding research efforts and the conclusions drawn from examined cases with great practical interest. In the presented analyses, the bar is subjected to arbitrarily distributed or concentrated twisting and warping moments along its length, while its edges are supported by the most general torsional boundary conditions. For the dynamic problems, a distributed mass model system is employed taking into account the warping inertia. The analysis of the aforementioned problems is complete by presenting the evaluation of the torsion and warping constants of the bar, its displacement field, its stress resultants together with the torsional shear stresses and the warping normal and shear stresses at any internal point of the bar. Moreover, the construction of the stiffness matrix and the corresponding nodal load vector of a bar of arbitrary cross section taking into account warping effects are presented for the development of a beam element for static and dynamic analyses. Having in mind the disadvantages of the 3D FEM solutions, the importance of the presented beamlike analyses becomes more evident.

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17

Claus, B. J., X. Nie, B. E. Martin, and W. Chen. "A Side-Impact Torsion Kolsky Bar." Experimental Mechanics 55, no. 7 (May 27, 2015): 1367–74. http://dx.doi.org/10.1007/s11340-015-0032-2.

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18

Chen, T., and I. S. Weng. "Torsion of a Circular Compound Bar With Imperfect Interface." Journal of Applied Mechanics 68, no. 6 (October 4, 2000): 955–58. http://dx.doi.org/10.1115/1.1406962.

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The Saint-Venant torsion problem of a circular cylinder reinforced by a nonconcentric circular bar of a different material with an imperfect interface is studied. Conformal mapping together with a Laurent series expansion are employed to analyze the problem. The jump condition in either the warping function or the shear traction, characterizing the imperfect interface, is simulated in the transformed domain in an exact manner. Unlike the problem with perfectly bonded interface, the series solution has to be resolved by a truncation. Numerical illustrations are provided for the torsional rigidity of the cross section. In the case of perfect bonding case, our results agree with that reported in Muskhelishvili.

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19

Ecsedi, István, and Attila Baksa. "Saint–Venant torsion of anisotropic elliptical bar." International Journal of Mechanical Engineering Education 45, no. 3 (May 29, 2017): 286–94. http://dx.doi.org/10.1177/0306419017708642.

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The object of this article is the Saint–Venant torsion of anisotropic, homogeneous bar with solid elliptical cross section. A general solution of the Saint–Venant torsion for anisotropic elliptical cross section is presented and some known results are reformulated. The case of non-warping cross section is analysed.

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20

SUH, CHANG-MIN, MIN-HO KIM, UN-BONG BAEK, YOUNG-SIK PYOUN, CHANG-SIK KIM, and CHONG-HO CHI. "A STUDY ON THE ALTERNATIVE TECHNOLOGY USING UNSM INSTEAD OF THE PRESETTING METHOD FOR TORSION BAR." International Journal of Modern Physics B 24, no. 15n16 (June 30, 2010): 2435–40. http://dx.doi.org/10.1142/s0217979210065052.

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The torsion bar must be changed periodically due to its lack of durability and a phenomenon related to stress relaxation. Therefore technical development regarding the torsion bar's durability is urgently needed. In order to improve the fatigue life and durability of the dynamic components, new surface treatment technology such as ultrasonic shot peening, deep rolling, laser shock peening, etc. are developing widely. In this study, Ultrasonic Nanocrystal Surface Modification (UNSM) technology is applied as an advanced one to replace the presetting method (PM). UNSM and PM technology also induced the compressive residual stress on the surface layer of the torsion bar, which is the main improvement factor of fatigue life. DIN17221 material as a new MIL specification of torsion bar and SCM440 (as an alternative one to a old MIL-DTL-62567C) were processed with the UNSM technology to obtain the basic data and compare it between two, and then torsion fatigue tests of two materials were carried out to obtain the characteristics of torsion fatigue in this study.

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21

Sasso, Marco, and Edoardo Mancini. "Feasibility Study of a Combined Tension-Torsion Hopkinson Bar." EPJ Web of Conferences 250 (2021): 01017. http://dx.doi.org/10.1051/epjconf/202125001017.

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The increasing interest to improve the description of the plastic behavior and the fracture prediction for ductile materials under complex loading conditions conducted the researchers to overcome the J2 plasticity theory. To do this more sophisticated plasticity model base on ductile damage have been implemented. Material model parameters must be identified by means of proper testing and calibration procedures requiring different loading conditions. Different types of tests must be performed, imposing multiaxial stress paths to the specimens. Tensile tests on smooth and round notched bars, plane strain tests, torsion tests, compression and combined tension–torsion tests on hollow and solid cylindrical bars must be executed. While multiple works are present in literature for model assessment and validation in quasi-static conditions, nothing can be found at high strain rate in biaxial conditions (tension-torsion). Biaxial tests in dynamic conditions are very difficult to carry out especially if you are interested to register the entire story of stress and strain. In this work, analytical and numerical study to evaluate the feasibility to carry out dynamic tension, dynamic torsion, dynamic torsion-static tension/compression and dynamic tension–dynamic torsion tests is discussed. The tests will be performed using a properly designed Split Hopkinson Bar.

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22

Tominaga, Yasutoshi, Young-Sik Pyun, Dong-Il Kim, and Do-Hyun Choe. "Development of Torsion Bar for Antiroll-Bar Assembly for Express Train." Transactions of the Korean Society of Mechanical Engineers A 36, no. 9 (September 1, 2012): 979–84. http://dx.doi.org/10.3795/ksme-a.2012.36.9.979.

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23

Tkachuk, Mykola M., Andrey Grabovskiy, Anton Zavorotnii, Serhii Kutsenko, Mariia Saverska, Illia Klochkov, Olena Zinchenko, et al. "NUMERICAL SIMULATION OF ELASTIC-PLASTIC DEFORMATION OF TORSION SHAFTS OF VEHICLE SPRING SYSTEMS, TAKING INTO ACCOUNT CONTACT INTERACTION." Bulletin of the National Technical University «KhPI» Series: Engineering and CAD, no. 1 (December 28, 2022): 91–114. http://dx.doi.org/10.20998/2079-0775.2022.1.10.

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The paper develops a model of stress-strain state of torsion shafts. A variable formulation of the problem on the basis of the theory of variational inequalities was made. Numerical modeling of the stress-head-deformed state was made with the involvement of the finite element method. In the model of the stress-head-deformed state of torsion shafts, its generalized parametric description is integrated. It contains both varied significant design and technological indicators, in particular, the structural design of the torsion head, the galley transition and the diameter of the stem torsion shaft stem, and the parameters of the technological process of double winding: twist angles and features of the shaft material. It is established that the stresses that occur in the torsion shaft are mainly concentrated in the contact interaction zone of the spline shaft head with the spline coupling. The parametric dependencies of the level of equivalent stresses by Mises on the level of double windings and on the ratio of the head diameter and the stem of the torsion shaft stem have been determined. Recommendations have been developed regarding the improvement of strength characteristics of torsion shafts. Contact pressure distribution on the slots of the torsion bar head is also determined. Its characteristic features depend on the type of boundary conditions. If bilateral interaction is enabled on the boundary, the contact pressure may become negative. Furthermore, the contact pressure gets a sharp spike. This non-physical feature disappears if unilateral contact conditions are imposed. Therefore, this version of the boundary conditions is more adequate. It was used to compute the stress-strain state of a torsion bar, taking into account the plastic deformation of the material and the contact interaction with conjugate bodes. Keywords: torsional shaft; stress-strain state; finite element method; theory of variational inequalities; contact interaction

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24

Chen, Zhewu, Zhanda Huang, Yong Guo, and Guibing Li. "Prediction of Mechanical Properties of Thin-Walled Bar with Open Cross-Section under Restrained Torsion." Coatings 12, no. 5 (April 21, 2022): 562. http://dx.doi.org/10.3390/coatings12050562.

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Thin-walled bars with an open cross-section are widely used in mechanical structures where weight and size control are particularly required. Thus, this paper attempts to propose a theoretical model for predicting the mechanical properties of a thin-walled bar with an open cross-section under restrained torsion. Firstly, a theoretical model with predictions of shear stress, buckling normal stress, and secondary shear stress of the thin-walled bar with open cross-section under the condition of restrained torsion was developed based on torsion theory. Then, physical test and finite element modeling data were employed to validate the theoretical predictions. The results indicate that the theoretical predictions show good agreements with data of finite element modeling and experiments. Therefore, the proposed theoretical model could be used for the prediction of the mechanical response of a thin-walled bar with an open annular section under restrained torsion.

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25

Wu, Lin Feng, Xiao Chun Yin, and Zhong Hua Liu. "3-D Optimization of Self-Balanced Torsion Bar Diameter and its Fillet Radius by FEM." Applied Mechanics and Materials 42 (November 2010): 151–55. http://dx.doi.org/10.4028/www.scientific.net/amm.42.151.

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The torsion bar system model of a 150-ton convertor tilting mechanism was made by using APDL language of the finite element software ANSYS.And the diameter of the torsion bar and the fillet radius were optimized based on the above analysis by using optimal module.A new 150-ton convertor was developed by the optimal results and has been in good performance since 2006.The results show that the optimal structure of torsion bar was more economic and reasonable than the traditional structure.Optimization scheme can all be given access to safe,economical and reliable design results and ensure the converter performance.Moreover, this method provides three-dimensional, multi-touch, irregular structure with a valuable experience and a new idea and can be extended to the design of heavy products.

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26

Erofeev, V. I., V. N. Komarov, and B. B. Lampen. "Nonlinear stationary torsion wave in a bar." Journal of Machinery Manufacture and Reliability 44, no. 4 (July 2015): 332–36. http://dx.doi.org/10.3103/s105261881503005x.

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27

Solazzi, Luigi. "Design of a truck cab torsion bar." International Journal of Heavy Vehicle Systems 26, no. 5 (2019): 692. http://dx.doi.org/10.1504/ijhvs.2019.10023140.

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28

Solazzi, Luigi. "Design of a truck cab torsion bar." International Journal of Heavy Vehicle Systems 26, no. 5 (2019): 692. http://dx.doi.org/10.1504/ijhvs.2019.101887.

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29

Sadek, K. S. H., and A. Daadbin. "Modelling of a torsion-bar cam mechanism." Mechanism and Machine Theory 28, no. 5 (September 1993): 631–40. http://dx.doi.org/10.1016/0094-114x(93)90004-f.

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30

Wang, Xu, and Peter Schiavone. "Torsion of an arbitrarily shaped nanosized bar." Archive of Applied Mechanics 86, no. 6 (October 31, 2015): 1037–48. http://dx.doi.org/10.1007/s00419-015-1077-5.

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31

Aoyama, Koji, Mitsuaki Furui, and Susumu Ikeno. "Microstructure Evolution in AZ31 Magnesium Alloy Worked by Torsion at Warm Temperature." Materials Science Forum 654-656 (June 2010): 727–30. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.727.

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It had been already reported that the resistance of compression at warm condition can be decreased by the preliminary torsion working at AZ31B magnesium alloy. In the present study, it was found that the dynamic recrystallization occured during warm working by torsion. Dynamic recrystallization was slightly seen in the fractured edge of the bar at a rotation speed of 1rpm at temperature 573K and 623K. The amount of torsion to fracture was increased with increasing of deformation temperature. Remarkable dynamic recrystallization could be seen in the center of bar at the rotation speed of 1rpm at temperature of 673K.

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32

Liu, Jing Zhong, and Fan Jiang. "Study on Influence Analysis of Vehicle Steering Gains Based on ADAMS/Car of Suspension Torsion Bar and Anti-Roll Bar." Applied Mechanics and Materials 278-280 (January 2013): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.239.

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In order to study the effect of stiffness of the suspension and anti-roll bar on the vehicle handling performance, and provide reference for suspension design and adjustment afterwards, two virtual prototypes and their variants without anti-roll bar and front suspension assembly anti-roll bar, were structured in ADAMS/Car. Through simulation test with input of steering wheel angle step, the curves of effect of angle stiffness of front suspension torsion bar and anti-roll bar on vehicle steering gain were obtained. On two models, steering gains respectively produced about 20% and 1% decline of the range of experience while the angle stiffness of torsion bar increased from 0.5 to 2.0 times of the base stiffness; steering gain respectively produced about 10% increase or 1% decline of the range of experience while the angle stiffness of anti-roll bar decreased from the base angle stiffness to 0 or increased to 2.0 times of the base stiffness.

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33

He, Xiang Dong, Jun Yan Huang, and Shu Tian Liu. "Bayesian Reliability-Based Optimization Design of Torsion Bar." Advanced Materials Research 538-541 (June 2012): 3085–88. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.3085.

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Based on bayesian statistics theory and reliability-based optimization design, the research presents a new reliability-based optimization design approach that solves the form of finite test samples. In the article, the bayesian reliability-based optimization mathematical model is established and the bayesian reliability-based optimization approach of torsion bar is proposed. The method adopts a bayesian inference technique to estimate reliability, gives definition of bayesian reliability. The results illustrates the method presented is an efficient and practical reliability-based optimization approach of torsion bar.

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34

Chichili, D. R., and K. T. Ramesh. "Recovery Experiments for Adiabatic Shear Localization: A Novel Experimental Technique." Journal of Applied Mechanics 66, no. 1 (March 1, 1999): 10–20. http://dx.doi.org/10.1115/1.2789137.

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A novel experimental technique has been developed that allows the recovery of specimens within which an adiabatic shear band has been grown as the result of a single torsional pulse. The technique uses a new device called the compression-torsion Kolsky bar; this is an adaptation of the classical torsional Kolsky bar in which both compression and torsion are stored in the clamped length. Recovery of the specimen is obtained by causing the transmitted compression pulse to reflect from the free end of the output bar as a tensile pulse which then causes failure of the specimen/output-bar interface. All further pulses then cause no more than rigid motions of the specimen. Thus the specimen is recovered after it has been loaded by a single torsional pulse; microscopic examination of the recovered specimen now allows the rigorous determination of the evolution of microstructure and the identification of deformation mechanisms that are active under the dynamic shear loading. As an example of the utility of this recovery technique, its application to the study of adiabatic shear localization in alpha-titanium is presented. The technique allows a systematic study of the microscopic mechanisms that drive the initiation and growth of adiabatic shear bands by recovering samples within which shear bands have been grown under controlled conditions; further characterization through sectioning, followed by optical, scanning, and transmission electron microscopy is then possible. The technique also allows one to study the influence of the shape and size of geometric defects (for example, notch tip radius and notch depth) on the initiation of adiabatic shearing failures. The effect of normal stresses on the susceptibility of a material to shear localization can also be investigated.

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35

Ecsedi, István, and Ákos József Lengyel. "BOUNDS FOR THE TORSIONAL RIGIDITY OF CYLINDRICALLY ANISOTROPIC BARS." Journal of Pure and Applied Mathematics: Advances and Applications 25, no. 1 (October 10, 2022): 49–60. http://dx.doi.org/10.18642/jpamaa_7100122258.

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Bounds for the torsional rigidity of cylindrically anisotropic bars with one plane of elastic symmetry perpendicular to the axis of bar are derived making of use the two minimum theorems of elasticity. All results of the paper are based on the theory of uniform torsion which was developed by Saint-Venant and Prandtl. Illustrative example shows that the one term approximation leads to relative close bounds.

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Wang, Xu, Cuiying Wang, and Peter Schiavone. "Torsion of elliptical composite bars containing neutral coated cavities." Theoretical and Applied Mechanics 43, no. 1 (2016): 33–47. http://dx.doi.org/10.2298/tam151029001w.

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Using complex variable methods and conformal mapping techniques, we establish the existence of coated cavities of various shapes that do not disturb the warping function in a host elliptical bar. These cavities are known as ?partly neutral cavities?. Our results show that the two axes corresponding to the neutral elliptical coating are parallel to those of the host elliptical bar and that the centre of the elliptical coating can be located arbitrarily on the major axis of the host bar. Examples of neutral coated non-elliptical cavities are provided.

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Golovanov, A. I., V. I. Mitryaikin, and V. A. Shuvalov. "Stress analysis of helicopter main rotor torsion bar." Russian Aeronautics (Iz VUZ) 52, no. 1 (March 2009): 104–9. http://dx.doi.org/10.3103/s1068799809010188.

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Neagoe, Ion, and Daniel Năsulea. "Device for Precision Cold Shearing Using Bar Torsion." RECENT - REzultatele CErcetărilor Noastre Tehnice 20, no. 1 (December 18, 2019): 14–21. http://dx.doi.org/10.31926/recent.2019.57.014.

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Chernyaev, A. A. "Isoperimetric solution to problem of prismatic bar torsion." IOP Conference Series: Earth and Environmental Science 87 (October 2017): 082009. http://dx.doi.org/10.1088/1755-1315/87/8/082009.

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Neale, K. W., and S. C. Shrivastava. "Finite elastic-plastic torsion of a circular bar." Engineering Fracture Mechanics 21, no. 4 (January 1985): 747–54. http://dx.doi.org/10.1016/0013-7944(85)90083-9.

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Laederich, Stephane. "$$\bar \partial $$ -Torsion, foliations and holomorphic vector fields." Communications in Mathematical Physics 145, no. 3 (April 1992): 447–58. http://dx.doi.org/10.1007/bf02099393.

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Pergamentseva, �. D. "Torsion of a circular bar with longitudinal grooves." International Applied Mechanics 28, no. 5 (May 1992): 334–42. http://dx.doi.org/10.1007/bf00848033.

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Ecsedi, István, Ákos József Lengyel, Attila Baksa, and Dávid Gönczi. "Solution of the Saint-Venant torsion of orthotropic bar by the method of boundary collocation." Multidiszciplináris tudományok 12, no. 3 (2022): 151–62. http://dx.doi.org/10.35925/j.multi.2022.3.14.

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This paper deals with an approximate solution of Saint-Venant torsion problem of orthotropic bar with solid cross section. The boundary collocation is used to get the approximate analytical solution of the torsion problem. Examples illustrate the applications of the presented numerical solution.

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44

Shimoda, Tomofumi, Satoru Takano, Ching Pin Ooi, Naoki Aritomi, Yuta Michimura, Masaki Ando, and Ayaka Shoda. "Torsion-Bar Antenna: A ground-based mid-frequency and low-frequency gravitational wave detector." International Journal of Modern Physics D 29, no. 04 (March 4, 2019): 1940003. http://dx.doi.org/10.1142/s0218271819400030.

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Expanding the observational frequency of gravitational waves is important for the future of astronomy. Torsion-Bar Antenna (TOBA) is a mid-frequency and low-frequency gravitational wave detector using a torsion pendulum. The low resonant frequency of the rotational mode of the torsion pendulum enables ground-based observations. The overview of TOBA, including the past and present status of the prototype development, is summarized in this paper.

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Peirs, Jan, Patricia Verleysen, Kim Verbeken, Frederik Coghe, and Joris Degrieck. "High Strain Rate Torsion and Bauschinger Tests on Ti6Al4V." Materials Science Forum 706-709 (January 2012): 774–79. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.774.

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An accurate isotropic and kinematic hardening model and description of the strain rate dependent material behaviour is necessary for simulation of fast forming processes. Consequently, the material model parameter identification requires experiments where large strains, high strain rates and strain path changes can be attained. Usually, quasi-static tension-compression Bauschinger tests are used to assess the materials kinematic hardening. Hereby it’s important to have the same specimen geometry and boundary conditions in the forward and reverse loading step which is not easily achieved in high strain rate testing techniques. In this work, high strain rate split Hopkinson bar torsion experiments on Ti6Al4V are carried out to study the constitutive material behaviour at large plastic strain and strain rate. In torsion experiments, due to the absence of cross sectional area reduction, higher strains than in tensile tests can be obtained. In addition, a modified torsional split Hopkinson bar setup is developed to perform dynamic Bauschinger tests. A shear reversed-shear load is applied instead of the classical tension-compression load cycle. The test results are analysed to find out if the technique can be used for characterisation of the kinematic material behaviour. Digital image correlation and finite element simulations are used to improve the interpretation of the experimental results.

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Suortti, P., J. Keyriläinen, and M. Fernández. "Fine-rotation attachment to standard goniometers." Journal of Applied Crystallography 37, no. 1 (January 17, 2004): 62–66. http://dx.doi.org/10.1107/s0021889803024282.

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A new type of fine-rotation stage has been constructed and tested. It can be attached to standard goniometers used in X-ray and neutron crystallography. The device consists of a shaft and a bar that is fitted tightly to a hole traversing the shaft. The diameter of the shaft is 5 to 10 times larger than the diameter of the bar and the length of the bar is about 5 times larger than the height of the shaft. The bottom of the shaft is attached to the top plate of the goniometer and a goniometer head can be fitted to the other end of the shaft. The free end of the bar is pushed tangentially by a linear actuator to produce a torsion moment at the shaft. The dimensions and materials of the prototype were chosen such that a 1 mm bend of the bar corresponded to a torsion angle of the shaft of about 20 µrad. The rotation angle was measured using a double-crystal diffractometer in the non-dispersive setting, with MoKα1radiation from a fine-focus X-ray tube. Accurately known angular deviations were produced by refraction in a prism and the shifts in the rocking-curve position were measured. The measured torsion angle agreed within 4% with the value calculated from the elastic constants and dimensions of the device. The repeatability of the angle was ±20 nrad (0.004 arcsec).

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Radhakrishnan, K., A. Godwin Antony, K. Rajaguru, and B. Sureshkumar. "Torsional vibration analysis of torsion bar spring for off road vehicle driver seat." Materials Today: Proceedings 21 (2020): 669–72. http://dx.doi.org/10.1016/j.matpr.2019.06.736.

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Chernyavsky, D. I., and D. D. Chernyavsky. "Calculation strength of torsion bar suspension of micromirrors (MEOMS)." Omsk Scientific Bulletin, no. 177 (2021): 5–12. http://dx.doi.org/10.25206/1813-8225-2021-177-5-12.

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The paper considers the strength calculation of the torsion bar suspension of a micromirror with a reflective layer of high optical quality of the surface for deflecting the reflected laser beam. By changing the angle of inclination of the micromirror, the laser beam enters the various input channels of the optical sensor. In this case, a control signal is generated for the further operation of the microcircuit. Thus, the micromirror performs the function of a switch for input optical channels connecting certain input or output elements of the microcircuit in various combinations for further processing. In this work, the calculation of the strength parameters of the mechanical structure of a micromirror made of various materials has been carried out. Practical recommendations related to the development of micromirror torsion bar suspension are given

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Li, Shuguang. "The Centre of Twist for a Prismatic Bar under Free Torsion." International Journal of Mechanical Engineering Education 31, no. 3 (July 2003): 226–32. http://dx.doi.org/10.7227/ijmee.31.3.4.

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This paper presents a proof that the centre of twist for a prismatic bar under torsion coincides with the centroid of the cross-section. The centre of twist has long been regarded as arbitrary, since the consequence of a differently chosen centre of twist amounts only to a rigid-body rotation. However, what has not been properly addressed is that an arbitrarily chosen centre of twist results in an inconsistency in the formulation of conventional torsion theory.

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Heller, Klaus, Moritz Hallmannseder, David Colin, Kalle Kind, and Klaus Drechsler. "Comparing Test Methods for the Intra-ply Shear Properties of Uncured Prepreg Tapes." Science and Engineering of Composite Materials 27, no. 1 (April 15, 2020): 89–96. http://dx.doi.org/10.1515/secm-2020-0009.

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AbstractTo achieve cost-efficient manufacturing and a high part quality in Thermoset Automated Fiber Placement (TS-AFP), knowledge about the interaction between material and process parameters is of special interest. Material properties of prepregs are well known at the cured state of the resin. However, there are no standardized test procedures for the mechanical behavior of the uncured prepreg tapes. To investigate the intra-ply shear deformation behavior of uncured unidirectional prepreg tapes, we compared several measurement procedures and conducted experiments for rheometer based tests using 8552/AS4 material. We identified a rotational parallel platens rheometer test method and a torsion bar rheometer test method to be suitable. Experiments using both methods revealed that the Torsion Bar Test has a higher repeatability and the analysis is less complex. Furthermore, first results show that changes in material properties caused by aging can be analyzed using this method. In the future,we will use the Torsion Bar Test to characterize changes in deformation behavior due to material aging as well as material modifications. By this, we will be able to provide data for the material modeling thus enabling the prediction of lay-up defects such as buckling due to steering.

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