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Journal articles on the topic 'Breakaway torque'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Graham, Aaron K., Daniel P. Hess, and Heidi M. Stephens. "Screw Loosening in an In Vitro Mid Fibular Osteotomy Model under Dynamic Loading Conditions." Foot & Ankle International 21, no. 10 (2000): 849–51. http://dx.doi.org/10.1177/107110070002101009.

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The purpose of this study was to evaluate the effect of cyclic loading on screw fixation in an experimental bone plating model. The test specimens consist of plated porcine fibulae subjected to cyclic compressive, bending and torsional loading. Breakaway torque measurements of orthopedic screws are found to be significantly less than the screws tightening torque. The breakaway torque for a given screw and tapped bone hole is found to be consistent after repeated tightening, and is proposed as a viable approach to quantify bone screw loosening. After cyclic loading at moderate levels no screw l

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2

Nassar, Sayed A., and Xianjie Yang. "Novel Formulation of the Tightening and Breakaway Torque Components in Threaded Fasteners." Journal of Pressure Vessel Technology 129, no. 4 (2006): 653–63. http://dx.doi.org/10.1115/1.2767354.

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New formulas are developed for the torque-tension relationship, various torque components, and breakaway torque values in threaded fastener applications. The three-dimensional aspects of the lead helix and thread profile angles and the kinetic and static friction coefficients are all taken into account. Two scenarios of the contact pressure between threads and under the turning fastener head are considered, namely, uniformly distributed and linearly distributed contact pressure scenarios. The effect of thread pitch, lead helix and thread profile angles, friction coefficients, and fastener geom

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3

Scola, Alexander, Florian Gebhard, Sebastian Weckbach, et al. "Mechanical Quantification of Local Bone Quality in the Humeral Head: A Feasibility Study." Open Orthopaedics Journal 7, no. 1 (2013): 172–76. http://dx.doi.org/10.2174/1874325001307010172.

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Objectives: Surgical treatment of proximal humerus fractures can be challenging due to osteoporosis. The weak bone stock makes stable implant anchorage difficult, which can result in low primary stability. Accordingly, significant failure rates, even with modern locking plates, are reported in the literature. Intraoperative knowledge of local bone quality could be helpful in improving results. This study evaluates the feasibility of local bone quality quantification using breakaway torque measurements. Materials and Methods: A torque measurement tool (DensiProbe™) was developed to determine lo

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4

Bastian, Johannes Dominik, Mathias Bergmann, Ronald Schwyn, Marius Johann Baptist Keel, and Lorin Michael Benneker. "Assessment of the Breakaway Torque at the Posterior Pelvic Ring in Human Cadavers." Journal of Investigative Surgery 28, no. 6 (2015): 328–33. http://dx.doi.org/10.3109/08941939.2015.1016249.

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5

Kozik, T. J., J. E. Lowell, and A. Ertas. "Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part I: Derivation of General Equations." Journal of Energy Resources Technology 112, no. 3 (1990): 188–99. http://dx.doi.org/10.1115/1.2905757.

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General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to drill ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent.

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6

Kozik, T. J., J. E. Lowell, and A. Ertas. "Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part II: Analysis and Computer Simulation." Journal of Energy Resources Technology 112, no. 3 (1990): 200–207. http://dx.doi.org/10.1115/1.2905758.

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An analysis of the variation of forces acting on the upper ball joint of a riser string due to the drill ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the ship joint-tensioner system derived in Part I are solved. The variation in the tensioner cable forces is compared to data generated in field operation.

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7

Manoj Kumar, A. P., and Nayak S. Nagaraj. "Calculation of Friction Coefficients in Journal Bearings to Determine the Turning Gear Motor Power." Applied Mechanics and Materials 232 (November 2012): 869–73. http://dx.doi.org/10.4028/www.scientific.net/amm.232.869.

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Steam turbine turning gear is a gear train, driven by electric motor, which is used to drive the rotor at a given speed and capable of breaking away the turbine and its load equipment from a standstill. Steam turbine rotor trains are supported by journal bearing which require lube oil for cooling. The normal turning gear operation requires that lube oil and the lift oil systems must be in-service in order to reduce the friction coefficient at the journal bearings during breakaway. The rotor train breakaway and running torque is the resisting moments at each of the journal bearings. The resisti

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8

Konuhova, M., E. Kamolins, S. Orlova, A. Suleiko, and R. Otankis. "Optimisation of Permanent Magnets of Bioreactor Magnetic Coupling while Preserving their Efficiency." Latvian Journal of Physics and Technical Sciences 56, no. 4 (2019): 38–48. http://dx.doi.org/10.2478/lpts-2019-0023.

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Abstract The paper discusses issues related to the optimisation of magnetic couplings used in bioreactors (manufactured by JSC “Biotehniskais Centrs”). The purpose of optimisation was to preserve the maximum breakaway torque of the magnetic coupling while reducing the mass of rare earth elements used in its structure. The paper presents the rationale for the selected optimisation option taking into account the economic aspect. To solve the optimisation problem, the factors affecting the maximum torque of the magnetic coupling, such as the shape and height of the internal and external magnets,

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9

Syzrantsev, V. N., E. Y. Moskvina, and L. A. Chernaya. "A Method of Profile Modification of the Tooth Surface of Semi-Rolled Pan Gear." Proceedings of Higher Educational Institutions. Маchine Building, no. 05 (722) (May 2020): 32–40. http://dx.doi.org/10.18698/0536-1044-2020-5-32-40.

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The use of drives based on pan precession gears with a small shaft angle in which multiple-tooth meshing is implemented significantly increases the efficiency and transmitted torque in oil and gas equipment. It also and reduces the breakaway torque by almost an order in comparison with worm gears. The production of pan gears in the semi-rolled version significantly simplifies tooth cutting technology. To exclude the possibility of edge contact of the teeth coming into meshing due to their contact and bending deformations, it is necessary to carry out profile correction of the teeth. To address

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10

De Agostinis, M., S. Fini, and G. Olmi. "The influence of lubrication on the frictional characteristics of threaded joints for planetary gearboxes." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 15 (2016): 2553–63. http://dx.doi.org/10.1177/0954406215605863.

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Planetary gearboxes generally consist of a ring gear, or gear body, connected with the input and output flanges by means of several screws, equally spaced along the diameter. The ring gear is manufactured with steel, whereas the flanges are usually made of cast iron. These screws must provide axial preload between the parts, allowing the assembly withstanding the breakaway torque given by the difference between the output and input torque applied to the gearbox. For a given screw geometry, the axial preload can be calculated, provided that the friction coefficients in the thread and in the und

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11

Zhang, Haina, Decai Li, Qinglei Wang, and Zhili Zhang. "Theoretical analysis and experimental study on breakaway torque of large-diameter magnetic liquid seal at low temperature." Chinese Journal of Mechanical Engineering 26, no. 4 (2013): 695–700. http://dx.doi.org/10.3901/cjme.2013.04.695.

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12

Grote, Stefan, Tatjana Noeldeke, Michael Blauth, Wolf Mutschler, and Dominik Bürklein. "Mechanical torque measurement in the proximal femur correlates to failure load and bone mineral density ex vivo." Orthopedic Reviews 5, no. 2 (2013): 16. http://dx.doi.org/10.4081/or.2013.e16.

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Knowledge of local bone quality is essential for surgeons to determine operation techniques. A device for intraoperative measurement of local bone quality has been developed by the AO-Research Foundation (DensiProbe®). We used this device to experimentally measure peak breakaway torque of trabecular bone in the proximal femur and correlated this with local bone mineral density (BMD) and failure load. Bone mineral density of 160 cadaver femurs was measured by <em>ex situ </em>dual-energy X-ray absorptiometry. The failure load of all femurs was analyzed by side-impact analysis. Femur

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13

Chen, Xue Mei, Jing Liu, Jing Xu, et al. "An Experimental Study of Compatibility for Metallic Inserts Bonded into CFRP Laminates Soaked in Aircraft Fuel." Advanced Materials Research 1095 (March 2015): 518–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1095.518.

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CFRP laminates are used for various aircraft structural components because of their good mechanical and physical properties. Metallic inserts are one kind of aerospace fasteners, which are usually installed in the metallic components by an interference fit. However, when metallic inserts are installed in the CFRP laminates by the traditional installing way, delamination and low efficiencies are troublesome. Therefore, excellent quality and cost effective installing metallic inserts into the CFRP laminates remains a challenge. In this paper, a series of experiments were carried out to study the

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14

Khrebtova, O. A., and N. V. Zachepa. "Analysis of electric drive systems for performance of driving and starting under load." Electrical Engineering and Power Engineering, no. 4 (December 30, 2020): 18–25. http://dx.doi.org/10.15588/1607-6761-2020-4-2.

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Purpose. Perform an analysis of existing automated control systems of the electric drive and methods of forming the starting torque to determine the compliance of the selected system and method to the requirements for trouble-free mode of start and start of the technological mechanism in difficult conditions or breakaway and start under load.. Methodology. Comparison of energy performance and capabilities of control systems and methods for the formation of starting torque, mathematical calculations, analysis of the properties of systems and methods in accordance with the requirements of

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15

Gun, Evgeny I., Alexander R. Vakhitov, Vitaly V. Salnikov, Igor G. Gun, Jon Ortueta, and Agustin Anitua. "Simulation of the axial joint pressing process." Vestnik of Nosov Magnitogorsk State Technical University 17, no. 1 (2019): 46–52. http://dx.doi.org/10.18503/1995-2732-2019-17-1-46-52.

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When designing the axial joint pressing process, a relevant issue is the process parameters which directly influence the nature of the deformation of the housing, and, ultimately, on the formation of an all-in-one connection of a ball stud with a joint housing. These parameters are press force, punch displacement and matrix geometry. The quality of the all-in-one connection depends on a correct selection of the indicated parameters. If the axial joint insert is compressed evenly, the connection will be considered to be the most rational, that is the load will be distributed uniformly over the

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16

Nassar, Sayed A., and Xianjie Yang. "Torque-Angle Formulation of Threaded Fastener Tightening." Journal of Mechanical Design 130, no. 2 (2007). http://dx.doi.org/10.1115/1.2821388.

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In this paper, the evolution equations of the bearing and thread friction coefficients are proposed based on mechanical behavior of the bolted joint assembly. The study shows excellent correlation between the proposed model and the experimental results for the breakaway torque values in both the tightening and loosening directions. Evaluation of the torque-angle control of the tightening process is made, and a modified torque-angle control approach is proposed. The effect of friction coefficients on the error in the clamping force prediction is analyzed.

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17

Gehweiler, Dominic, Ursula Styger, Boyko Gueorguiev, Christian Colcuc, Thomas Vordemvenne, and Dirk Wähnert. "Local bone quality measure and construct failure prediction: a biomechanical study on distal femur fractures." Archives of Orthopaedic and Trauma Surgery, February 15, 2021. http://dx.doi.org/10.1007/s00402-021-03782-7.

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Abstract Introduction The aim of this investigation was to better understand the differences in local bone quality at the distal femur and their correlation with biomechanical construct failure, with the intention to identify regions of importance to optimize implant anchorage. Materials and methods Seven fresh–frozen female femurs underwent high-resolution peripheral quantitative computed tomography (HR-pQCT) to determine bone mineral density (BMD) within three different regions of interest (distal, intermedium, and proximal) at the distal femur. In addition, local bone quality was assessed b

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18

Jo, Jong Chull, Myung Jo Jhung, Seon Oh Yu, Hho Jung Kim, and Young Gill Yune. "Root Cause Analysis of SI Nozzle Thermal Sleeve Breakaway Failures Occurring at PWR Plants." Journal of Pressure Vessel Technology 131, no. 1 (2008). http://dx.doi.org/10.1115/1.2980017.

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At conventional pressurized water reactors (PWRs), cold water stored in the refueling water tank of emergency core cooling system is injected into the primary coolant system through a safety injection (SI) line, which is connected to each cold leg pipe between the main coolant pump and the reactor vessel during the SI operation, which begins on the receipt of a loss of coolant accident signal. In normal reactor power operation mode, the wall of SI line nozzle maintains at high temperature because it is the junction part connected to the cold leg pipe through which the hot main coolant flows. T

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