Journal articles: 'Twisting moment'

1

Lau, John H. "Bending and Twisting of 60Sn40Pb Solder Interconnects With Creep." Journal of Electronic Packaging 116, no. 2 (June 1, 1994): 154–57. http://dx.doi.org/10.1115/1.2905504.

Full text

Abstract:

An exact analysis is presented for the creep deformation of a thin-walled circular solder cylinder under the actions of bending and twisting moments. Dimensionless interaction curves and charts which relate the variables, interconnect geometry, solder material properties, bending moment, twisting moment, curvature rate, and twist rate are also provided for engineering practice convenience.

APA, Harvard, Vancouver, ISO, and other styles

2

Webb, George, Kanyakon Kosinanonth, Tushar Chaudhari, Saeid Alizadeh, and Gregory A. MacRae. "Column Moment Demands from Orthogonal Beam Twisting." Key Engineering Materials 763 (February 2018): 259–69. http://dx.doi.org/10.4028/www.scientific.net/kem.763.259.

Full text

Abstract:

Beam column joint subassemblies in steel moment frames often have simply-supported gravity beams framing into the joint in the perpendicular direction. When these subassemblies undergo lateral displacement, moments enter the column from the beams. Some of these moments are directly applied from the in-plane beam and slab stresses as they contact the column, and additional moments occur as the slab causes the perpendicular simply supported beams to twist. In most design codes around the world, no explicit consideration of these moments is performed even though they may increase the likelihood of column yielding and a soft-storey mechanism. This paper quantifies the magnitude of these perpendicular beam twisting moments in typical subassemblies using inelastic finite element analysis. It is shown that for beam-column-joint-slab subassemblies where the primary and secondary beams are fully welded to the column, the addition of slab effects significantly increases the total stiffness and strength of the composite frame structure. In addition to this, it is also shown the twisting moment demand of the secondary beams increased the frames strength by approximately 2% for an imposed drift of 5% for the subassembly investigated when no gap was provided between slab and the column. It was also shown the twisting moment demand of the secondary beams increased the frames strength by approximately 10% for a maximum imposed drift of 5% for the subassembly investigated when a gap was provided between the slab and the column.

APA, Harvard, Vancouver, ISO, and other styles

3

Strozzi, A., and G. Monegato. "On the incompatibility between the equivalent shear force concept and the integral formulation of contact problems between Kirchhoff plates and irregular linear supports." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 7 (July 1, 2008): 1149–63. http://dx.doi.org/10.1243/09544062jmes801.

Full text

Abstract:

It is shown that, when employing the integral formulation to describe contact problems between Kirchhoff plates and irregular linear supports, the equivalent shear force concept may be incompatible with the integral approach. In such circumstances the equivalent shear force concept has to be abandoned in favour of an equivalent twisting moment approach. A classical example of an infinite plate resting on a linear central segment is revisited in the light of the equivalent twisting moment concept, where all the computations are carried out in exact form. An additional example is developed to show that the usefulness of an integral approach based upon the equivalent twisting moment concept remains valid even when the equivalent twisting moment is applied at a plate border along which the twisting moment must be null, as it occurs in a partially clamped border. The reaction singularity at the endpoints of a linear support is examined with the Williams asymptotic method. Finally, a physical interpretation is proposed for the adoption of a distributed twisting moment among the contact reactions.

APA, Harvard, Vancouver, ISO, and other styles

4

Złoto, Tadeusz, and Konrad Kowalski. "Load of the slipper-swash plate kinematic pair of an axial piston pump." MATEC Web of Conferences 157 (2018): 08013. http://dx.doi.org/10.1051/matecconf/201815708013.

Full text

Abstract:

The paper presents problems related to the twisting moment of the slipper. The load of the slipper and the piston has been presented and the complex formula of twisting moment of the slipper has been established. Achieved results has been presented graphically. The conducted research has indicated that the value of the twisting moment relays on both the exploitation and geometrical parameters.

APA, Harvard, Vancouver, ISO, and other styles

5

SERBEST, KASIM, MILAIM BERISHA, and MURAT CILLI. "DYNAMIC ANALYSIS OF THREE DIFFERENT HIGH BAR DISMOUNTS IN THE SIMMECHANICS ENVIRONMENT." Journal of Mechanics in Medicine and Biology 18, no. 03 (May 2018): 1850030. http://dx.doi.org/10.1142/s0219519418500306.

Full text

Abstract:

This study compares certain kinematic and kinetic parameters in giant circles performed before twisting, double stretched and double tucked dismounts using the dynamic model in the SimMechanics environment. The joint moments calculated using the designed model were investigated for the three different dismounts. The study included a 13-year-old voluntary national gymnast with seven years of training history. Markers were placed on the wrist, elbow, shoulder, hip, knee and ankle joints of the gymnast. The gymnast was asked to perform twisting, double stretched and double tucked dismounts. MATLAB and SimMechanics were used to calculate joint moments. The moves were simulated and the joint moments during the moves were calculated using the SimMechanics toolbox. The study observed that the highest joint moment was in the wrist joint in all three dismounts, in line with the findings of previous studies. However, unlike other studies, higher joint moments were calculated in the accelerated giant circle performed together with thrusts, compared with the regular giant circle. While there were similar maximum moment values in twisting dismounts and double tucked dismounts, an almost three times higher moment was observed in double stretched dismounts. In terms of joint moments, stretched dismount is obviously the most difficult move, which is consistent with the difficulty levels. A recorded performance of the mechanical model created in the SimMechanics environment was investigated in terms of the twist angle and moments generated on the bar, and found to be sufficient and useful. However, there are certain restrictions regarding the methods employed in this study. We concluded that the mechanical model will allow for the performance of kinematic and kinetic analyses of different gymnasts and types of moves thanks to its flexible structure.

APA, Harvard, Vancouver, ISO, and other styles

6

Li, Jun Lin, Xue Xia Zhang, and Wei Yang Yang. "An Analysis of Fracture Problems of Orthotropic Composite Plate under Bending and Twisting." Key Engineering Materials 306-308 (March 2006): 805–10. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.805.

Full text

Abstract:

An analysis of fracture problems near crack tip for linear elastic orthotropic composite plate under bending and twisting is carried out. By solving the boundary value problem of partial differential equations and applying the method of undetermined coefficients, the two group expressions for bending moment, twisting moment and displacement near crack tip are derived. The formulae have certain practical and referential value in related fracture analysis.

APA, Harvard, Vancouver, ISO, and other styles

7

Zhang, En Wei, Yun Bo Yang, Wei Song, Xiao Wei Wei, Zhi Bin Qiu, Jiang Jun Ruan, and Dao Chun Huang. "Study on Bending and Twisting Mechanical Properties of High Voltage Porcelain Post Insulator." Applied Mechanics and Materials 521 (February 2014): 334–38. http://dx.doi.org/10.4028/www.scientific.net/amm.521.334.

Full text

Abstract:

To study the mechanical properties of porcelain post insulators, the finite element model was established by ANSYS to calculate stress and strain distribution under bending or torsion moments. Mechanical tests based on resistance strain measurement technology were carried out on the actual porcelain post insulators to measure their strain distribution. The results show that sheds will cause strain concentration at the roots of porcelain column whether the post insulator is bearing bending or torsion load. The stress and strain of shed roots gradually increase from top to bottom along the post insulator when bearing bending moment, while they are relatively uniform under torsion moment. It should be taken full account of the stress concentration caused by sheds during the selection or maintenance of porcelain post insulators.

APA, Harvard, Vancouver, ISO, and other styles

8

Chen, Xu Qin, Gui Lan Jiang, and Guang Zhen Cheng. "Material Mechanical Performance about Worm Bending and Twisting Deformation for Civil Engineering." Advanced Materials Research 568 (September 2012): 187–90. http://dx.doi.org/10.4028/www.scientific.net/amr.568.187.

Full text

Abstract:

On the condition of line elastic and small deformation, more than 80% failure of the drive shaft is due to fatigue damage. It relates to the alternating stress of the drive shaft under the combination effect of bending and twisting. When drive shaft is under the combination effect of bending and twisting for civil engineering, torsion shear stress is perpendicular to bending normal stress. They can’t be simply stacked. Combining with the belt conveyor tension device of the worm transmission, first, simplify the external force; do stress analysis in horizontal plane and vertical plane respectively. Then make corresponding bending moment figure and separately calculate the internal force, stress of each basic deformation and make comprehensive bending moment figure and torque figure. Then use the application of superposition principle, the fourth strength theory to calculate worm transmission’s strength. The method makes senses to other transmission mechanism shaft bending and twisting combination strength analysis as a reference.

APA, Harvard, Vancouver, ISO, and other styles

9

Sinha, Hemant K., S. Muralidharan, and Keith Yates. "Ground and excited state dipole moments of planar vs. twisted p-N,N-(dimethylamino)benzonitrile systems: maximum charge transfer for minimum overlap." Canadian Journal of Chemistry 70, no. 7 (July 1, 1992): 1932–38. http://dx.doi.org/10.1139/v92-242.

Full text

Abstract:

Electric field induced change in the absorption spectrum (electrochromism) has been employed to obtain the ground and excited state dipole moments of planar and sterically hindered (twisted) p-N,N-(dimethylamino)benzonitriles in dioxane solution. These studies support the twisted intramolecular charge transfer (TICT) hypothesis and provide additional insight to the TICT concept. The charge transfer nature of the excited state has been found to directly depend on the torsional angle of the N,N-dimethylamino group with respect to the benzonitrile moiety. It is suggested that solvent coupling is essential to initiate twisting by affecting the intramolecular degrees of freedom and the existence of the highly dipolar excited state is a result of such twisting of the donor–acceptor bond. Theoretical calculations have been performed to explain the observed changes in dipole moment values.

APA, Harvard, Vancouver, ISO, and other styles

10

Petazzoni, Massimo, Fabio Carli, Micheal Kowaleski, and Roberto Tamburro. "Comparison of Rotation Force to Maintain Acetabular Ventroversion after Double Pelvic Osteotomy and 2.5 Pelvic Osteotomy in a Canine Cadaveric Model." Veterinary and Comparative Orthopaedics and Traumatology 31, no. 01 (2018): 062–66. http://dx.doi.org/10.3415/vcot-16-09-0135.

Full text

Abstract:

Objective The aim of this article was to compare the force required to maintain the acetabular ventroversion after double pelvic osteotomy (DPO) and modified triple pelvic osteotomy (2.5PO). Methods Unilateral DPO (group A) and unilateral modified DPO (group B = 2.5PO) were performed on cadaveric canine pelves (n = 10/group). The twisting moment required to maintain fragment position for DPO and 2.5DPO was compared. Results Mean twisting moment for the DPO group [5.92 N/m ± 2.59 (range, 2.61–12.17 N/m)] and the 2.5PO group [2.11 N/m ± 0.93 (range, 0.63 -3.85 N/m)] was significantly different (p < 0.01). Conclusion Dorsal cortex osteotomy of the ischium decreases the acetabular segment rotation force. Decreased force may facilitate acetabular rotation during DPO procedure.

APA, Harvard, Vancouver, ISO, and other styles

11

Kirkwood, M. G., G. D. T. Carmichael, and D. G. Moffat. "Finite element stress analysis of an equal diameter branch pipe intersection subjected to out-of-plane and twisting moments." Journal of Strain Analysis for Engineering Design 21, no. 1 (January 1, 1986): 9–16. http://dx.doi.org/10.1243/03093247v211009.

Full text

Abstract:

The authors have used the BERSAFE finite element computer program to model an equal diameter branch pipe intersection of mean diameter/thickness ratio 24.5. Previous results for internal pressure and the two in-plane bending moments are augmented by the present results for the two out-of-plane and the two twisting moment load categories. The predicted stresses are compared with results from tests on a 254 mm (10 inch) diameter welded branch junction, and also with the values from the current UK power piping code BS 806.

APA, Harvard, Vancouver, ISO, and other styles

12

Li, Mao Qi. "The Study of Mechanical Behaviors Performance of Bearing Form's Influence on Small-Radius Bridge." Advanced Materials Research 255-260 (May 2011): 776–80. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.776.

Full text

Abstract:

With the structural method, the "bending - twisting" coupling of the curve bridge is possible. As the small-radius bridge’s radius become smaller and smaller, the "Bending-Twisting" coupling become more and more common in order to discuss and verify the mechanical behaviors performance of supports' influence on small-radius bridge. This is done by changing the small-radius bridge’s supporting approach, using girder lattice method to construct a finite element model, analysis on a small-radius bridge of supporting longitudinal bending moment, torque and the influence of reaction force. The data shows that the double supports can reduce the small-radius bridge’s torque, make the medial and lateral support bearings equal reaction, make the small-radius bridge’s mechanical behaviors performance more reasonable, but was less affected by longitudinal bending moment. This conclusion of the small-radius bridge is significant to the designing work in the future.

APA, Harvard, Vancouver, ISO, and other styles

13

ASO, Atsushi, and Hiroaki TANAKA. "Investigation of Twisting Moment of Twistable Morphing Wing Having Arbitrary Twist Distribution." Proceedings of Mechanical Engineering Congress, Japan 2019 (2019): J19102. http://dx.doi.org/10.1299/jsmemecj.2019.j19102.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Choi, Dong Hoon. "An algorithmic solution for frictional contact problems subjected to a twisting moment." KSME Journal 1, no. 2 (September 1987): 108–14. http://dx.doi.org/10.1007/bf02971653.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Gupta, Prakhar, and Ajeet Kumar. "Effect of surface elasticity on extensional and torsional stiffnesses of isotropic circular nanorods." Mathematics and Mechanics of Solids 24, no. 6 (February 5, 2018): 1613–29. http://dx.doi.org/10.1177/1081286517753719.

Full text

Abstract:

We present a continuum formulation to obtain the effects of surface residual stress and surface elastic constants on extensional and torsional stiffnesses of isotropic circular nanorods. Analytical expressions of axial force, twisting moment, and extensional and torsional stiffnesses are obtained. Unlike the case of rectangular nanorods, we show that the stiffnesses of circular nanorods also depend on surface residual stress components. This is attributed to non-zero surface curvature inherent in circular nanorods. We further normalize these expressions and analyze their asymptotic limits in the limit of the nanorod’s radius approaching both zero and infinity, corresponding to surface-dominated and bulk-dominated regimes, respectively. Finally, we use the recently proposed helical Cauchy–Born rule and perform molecular statics calculations to obtain axial force, twisting moment, and stiffnesses of the tungsten nanorod. The tungsten material is selected since its bulk crystal exhibits isotropy in the stress-free state. The results from molecular statics calculations are shown to match the derived continuum formulas accurately.

APA, Harvard, Vancouver, ISO, and other styles

16

CHATTOPADHYAY, LALITHA, S. SRIDHARA MURTHY, and S. VISWANATH. "EXACT SOLUTION FOR BENDING OF AN ELASTIC PLATE CONTAINING A CRACK AND SUBJECTED TO A CONCENTRATED MOMENT." International Journal of Computational Methods 04, no. 02 (June 2007): 265–81. http://dx.doi.org/10.1142/s0219876207001023.

Full text

Abstract:

The problem of estimating the bending stress distribution in the vicinity of cracks located on a single line in an elastic plate subjected to concentrated moment is examined. Using classical plate theory and integral transform techniques, the general formulae for the bending moment and twisting moment in an elastic plate containing cracks located on a single line are derived. The solution is obtained in detail for the case in which there is a single crack in an infinite plate, and the bending stress intensity factor is determined in a closed form. Two examples are considered to illustrate the present approach.

APA, Harvard, Vancouver, ISO, and other styles

17

LEE, C. S., N. L. WONG, S. SRIGRAROM, and N. T. NGUYEN. "DEVELOPMENT OF 3-COMPONENT FORCE-MOMENT BALANCE FOR LOW SPEED WATER TUNNEL." Modern Physics Letters B 19, no. 28n29 (December 20, 2005): 1575–78. http://dx.doi.org/10.1142/s0217984905009948.

Full text

Abstract:

An effort is made to develop a new 3-component force-moment balance, which is capable of measuring lift force, drag force and pitching moment of a model mounted in the water tunnel. The concept used in the balance design is the bending- beam principle. The forces acting on the spring element cause strains on its surface, which are measured by strain gauges. Since strain yielded by the axial force is usually very small, therefore it is not practical to measure axial force using strain gauge directly to sense the strain in axial direction. The main idea of the new balance design is to translate all desired forces (lift and drag) in such a way that they yield bending strain at selected strain-gauge station. This is done by using a bending balance geometry. Under this apparatus, the model wing is mounted at one of its end to the bending balance. The corresponding Lift, Drag forces and Pitching moment are translated into moments at the other end of the balance, and can be measured from sets of strain gauges in bending mode (twisting mode for pitching moment). Example readings are presented in this paper.

APA, Harvard, Vancouver, ISO, and other styles

18

Liu, C., and B. Paul. "Fully Developed Sliding of Rough Surfaces." Journal of Tribology 111, no. 3 (July 1, 1989): 445–51. http://dx.doi.org/10.1115/1.3261945.

Full text

Abstract:

Given the contact region between two bodies, the normal pressure distribution over the contact region, and the coefficient of friction, we seek to find all combinations of tangential forces and twisting moment (about the normal to the contact surface) for which fully developed sliding impends. As part of the solution we must determine the distribution of the surface tractions (shear stresses) and the location of the instantaneous center (IC) of the impending motion. New closed form solutions of the stated problem are found for circular contact patches with pressure distributions corresponding to (a): a flat stamp; and (b): elastic spheroids with Hertzian pressure distributions. For contact regions other than circular, no closed form solutions are known. We have developed numerical procedures to solve for arbitrary contact patches, with arbitrary distributions of normal pressure, and present carpet plots of tangential force components (Fx, Fy) and IC coordinates for the following cases: flat ellipsoidal stamps; ellipsoidal indenters (Hertzian pressure); and a non-Hertzian, nonelliptical contact of a rail and wheel. Level curves of twisting moment Mz versus tangential force components are provided. Given any two of the three quantities (Fx, Fy, Mz), the algorithms and the plots in this paper make it possible and convenient to find the remaining force or moment which will cause gross sliding to impend, for virtually arbitrary contact regions and arbitrary pressure distributions.

APA, Harvard, Vancouver, ISO, and other styles

19

Sinha, Hemant K., and Keith Yates. "On the ground and excited state dipole moments of planar vs. twisted nitroaniline analogues." Canadian Journal of Chemistry 69, no. 3 (March 1, 1991): 550–57. http://dx.doi.org/10.1139/v91-083.

Full text

Abstract:

Planar and conformationally twisted p-nitroaniline (PNA) and N,N-dimethyl-p-nitroaniline (DMPNA) systems have been subjected to electric field study (electrochromism) to understand their charge transfer characteristics in the ground and excited states. The observed values of ground and excited state dipole moments suggest that twisting of either the donor (D) with respect to the acceptor (A) or vice versa can have a large impact on the resultant charge distribution, particularly on the excited state charge distribution. These observations remarkably support the TICT hypothesis and minimum overlap rule, as proposed by Grabowski et al. Simple molecular orbital calculations provide adequate explanation for the observed changes in the dipole moment and reasonable agreement has been found in each case studied. Key words: electrochromism, dipole moments, charge transfer.

APA, Harvard, Vancouver, ISO, and other styles

20

Kennedy, Benjamin T., David C. Weggel, David M. Boyajian, and R. E. Smelser. "Closed-form solution for a cantilevered sectorial plate subjected to a twisting tip moment." Mechanics Research Communications 35, no. 8 (December 2008): 491–96. http://dx.doi.org/10.1016/j.mechrescom.2008.03.001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Wang, Z.-J., F.-M. Meng, K. Xiao, J.-X. Wang, and W.-Z. Wang. "Numerical Analysis of Partial Slip Contact under a Tangential Force and a Twisting Moment." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 225, no. 2 (February 2011): 72–83. http://dx.doi.org/10.1177/2041305x10392125.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

KHAN, ZIAUDDIN, ANANYA KUNDU, and SUBRATA PRADHAN. "Experimental study of yttrium barium copper oxide superconducting tape’s critical current under twisting moment." Pramana 81, no. 4 (September 26, 2013): 667–76. http://dx.doi.org/10.1007/s12043-013-0598-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Steel, John A. "Vibration Transmission Between Columns and Built Up Structures." Building Acoustics 1, no. 3 (September 1994): 235–46. http://dx.doi.org/10.1177/1351010x9400100305.

Full text

Abstract:

Vibration transmission from columns into built up structures is studied using laboratory models. Beams attached to plates, forming built up structures, can influence transmission characteristics at these joints. Good agreement is found between measured and predicted results. The orientation of the beams effects coupling and strongest coupling is through a twisting moment applied to the beam. The effects of these changes in coupling on sound transmission between floors is discussed.

APA, Harvard, Vancouver, ISO, and other styles

24

LEVY, R., and E. GAL. "BUCKLING AND STRESS SOFTENING OF BEAM-COLUMNS UNDER COMPLEX THREE-DIMENSIONAL LOADING." International Journal of Structural Stability and Dynamics 02, no. 04 (December 2002): 487–98. http://dx.doi.org/10.1142/s0219455402000713.

Full text

Abstract:

This paper is concerned with buckling and stress softening of beam-columns under axial compression, biaxial bending and torsion. Members with no warping whose cross sections vary along the axis in a uniform manner with respect to the principal directions are also considered. The basic four coupled differential equations governing the behavior of three-dimensional beam columns are reformulated to include varying cross sections. A 12 × 12 stiffness matrix is assembled by solving the equations 6 times (which is sufficient to describe 3D behavior) for a sequence of appropriate discontinuities using the finite difference method. Two sets of curves are then computed. One set displays interaction diagrams that highlight the stress softening of beam stiffnesses. The other set of curves displays the buckling compressive load of a rectangular cantilevered beam under a variety of tri-directional moments (two bending moments and one twisting moment).

APA, Harvard, Vancouver, ISO, and other styles

25

Kumar, Narinder, Pawan Singh, Khem B. Thapa, and Devesh Kumar. "Electro-optical effect of the nCOOCB liquid crystal molecules under the terahertz frequency range: A theoretical approach." Journal of Physical Science 31, no. 3 (November 25, 2020): 113–27. http://dx.doi.org/10.21315/jps2020.31.3.9.

Full text

Abstract:

The homologous series of 4-cyano-4'-phenyl-phenol-alkanoates (nCOOCB) was studied under the influence of terahertz (THz) frequency range. The nCOOCB series has a re-entrant nematic phase, which is suitable for electro-optical properties under the THz frequency. The birefringence and order parameter expresses the twisting of the nematic phase at the higher frequency range. The director angle has fluctuated at a higher frequency range. The refractive index has remained constant at a higher frequency. The ionisation potential, electron affinity and Homo-Lumo energy gap continuously decrease with an extension of alkyl chain length; however, the dipole moment increases. The Homo-Lumo energy bandgap is reciprocal to the dipole moment.

APA, Harvard, Vancouver, ISO, and other styles

26

ROCHA, B. F., and M. SCHULZ. "Skew decks in reinforced concrete bridges." Revista IBRACON de Estruturas e Materiais 10, no. 1 (February 2017): 192–205. http://dx.doi.org/10.1590/s1983-41952017000100009.

Full text

Abstract:

Abstract This research investigates reinforced concrete plates and shells with skew reinforcement whose directions are not aligned with the principal internal forces. Two normal forces, one tangential force, two bending moments, and one twisting moment are defined in the plane of the element. The analysis includes two shear forces in the transverse direction. The membrane and flexural forces are distributed between two panels at the upper and lower faces of the element. The smeared cracking model, equilibrium considerations, and plasticity approach yield the design equations of the skew reinforcement. The slab reinforcement of flat bridges, with and without lateral beams and girder bridges are compared considering different skew angles. The minimum reinforcement criteria of skew meshes are discussed. The results show that skew reinforcement yields higher steel and concrete stresses.

APA, Harvard, Vancouver, ISO, and other styles

27

Liu, Xin Jin, Xu Zhong Su, and Ting Ting Wu. "Quasistatic Model for the Symmetrical Ring Spinning Triangle." Advanced Materials Research 331 (September 2011): 498–501. http://dx.doi.org/10.4028/www.scientific.net/amr.331.498.

Full text

Abstract:

In this paper, theoretical model of the distribution of fiber tension in the symmetrical spinning triangle was given firstly. Then, based on the force balance of the twisting point, the quasistatic model for the symmetrical ring spinning triangle was present. It is shown that the convergence point can be determined with ease for different spinning tension, torsion moment, the numbers of fibers at the roller nip, the fiber tensile Young’s modulus and cross-section, and the width of the spinning triangle.

APA, Harvard, Vancouver, ISO, and other styles

28

Marchlewski, Paweł. "Strength assessment of biomaterial models using selective sintering technology." Inżynieria Powierzchni 24, no. 2 (September 2, 2019): 34–38. http://dx.doi.org/10.5604/01.3001.0013.3595.

Full text

Abstract:

The article presents an innovative method for the assessment of mechanical properties of biomaterials. 3D models were used for this purpose, obtained by selective laser sintering, designed in various spatial configuration (size of pores, orientation of pores ). The Rotational Bridge test stand was used to carry out the tests, which allowed generating of twisting deformations in the tested materials. The values of the moment of torsion forces transferred by the tested models were analyzed and compared, depending on their spatial structure.

APA, Harvard, Vancouver, ISO, and other styles

29

Smriti and Ajeet Kumar. "Microscopic definition of internal force, moment, and associated stiffnesses in one-dimensional nanostructures at finite temperature." Mathematics and Mechanics of Solids 25, no. 4 (January 16, 2020): 986–1010. http://dx.doi.org/10.1177/1081286519897936.

Full text

Abstract:

We present a one-dimensional variant of the Irving–Kirkwood–Noll procedure to derive microscopic expressions of internal contact force and moment in one-dimensional nanostructures. We show that these expressions must contain both the potential and kinetic parts: just the potential part does not yield meaningful continuum results. We further specialize these expressions for helically repeating one-dimensional nanostructures for their extension, torsion, and bending deformation. As the Irving–Kirkwood–Noll procedure does not yield expressions of stiffnesses, we resort to a thermodynamic equilibrium approach to first obtain the Helmholtz free energy of the supercell of helically repeating nanostructures. We then obtain expressions of axial force, twisting moment, bending moment, and the associated stiffnesses by taking the first and second derivatives of the Helmholtz free energy with respect to conjugate strain measures. The derived expressions are used in finite-temperature molecular dynamics simulation to study extension, torsion, and bending of single-walled carbon nanotubes and their buckling.

APA, Harvard, Vancouver, ISO, and other styles

30

Gupta, Prakhar, and Ajeet Kumar. "Phonons in chiral nanorods and nanotubes: A Cosserat-rod-based continuum approach." Mathematics and Mechanics of Solids 24, no. 12 (June 30, 2019): 3897–919. http://dx.doi.org/10.1177/1081286519856407.

Full text

Abstract:

A Cosserat-rod-based continuum approach is presented to obtain phonon dispersion curves of flexural, torsional, longitudinal, shearing, and radial breathing modes in chiral nanorods and nanotubes. Upon substituting the continuum wave form in the linearized dynamic equations of stretched and twisted Cosserat rods, we obtain an analytical expression of a coefficient matrix (in terms of the rod’s stiffnesses, induced axial force, and twisting moment) whose eigenvalues and eigenvectors give us frequencies and mode shapes, respectively, for each of the above phonon modes. We show that, unlike the case of achiral tubes, these phonon modes are intricately coupled in chiral tubes owing to extension–torsion–inflation and bending–shear couplings inherent in them. This coupling renders the conventional approach of obtaining stiffnesses from the long wavelength limit slope of dispersion curves redundant. However, upon substituting the frequencies and mode shapes (obtained independently from phonon dispersion molecular data) in the eigenvalue–eigenvector equation of the above-mentioned coefficient matrix, we are able to obtain all the stiffnesses (bending, twisting, stretching, shearing, and all coupling stiffnesses corresponding to extension–torsion, extension–inflation, torsion–inflation, and bending–shear couplings) of chiral nanotubes. Finally, we show unusual effects of the single-walled carbon nanotube’s chirality as well as stretching and twisting of the nanotube on its phonon dispersion curves obtained from the molecular approach. These unusual effects are accurately reproduced in our continuum formulation.

APA, Harvard, Vancouver, ISO, and other styles

31

Harwood, Casey M., Mario Felli, Massimo Falchi, Steven L. Ceccio, and Yin L. Young. "The hydroelastic response of a surface-piercing hydrofoil in multi-phase flows. Part 1. Passive hydroelasticity." Journal of Fluid Mechanics 881 (October 24, 2019): 313–64. http://dx.doi.org/10.1017/jfm.2019.691.

Full text

Abstract:

Compliant lift-generating surfaces have widespread applications as marine propellers, hydrofoils and control surfaces, and the fluid–structure interactions (FSI) of such systems have important effects upon their performance and stability. Multi-phase flows like cavitation and ventilation alter the hydrodynamic and hydroelastic behaviours of lifting surfaces in ways that are not yet completely understood. This paper describes experiments on one rigid and two flexible variants of a vertical surface-piercing hydrofoil in wetted, ventilating and cavitating conditions. Tests were conducted in a towing tank and a free-surface cavitation channel. This work, which is Part 1 of a two-part series, examines the passive, or flow-induced, fluid–structure interactions of the hydrofoils. Four characteristic flow regimes are described: fully wetted, partially ventilated, partially cavitating and fully ventilated. Hydroelastic coupling is shown to increase the hydrodynamic lift and yawing moments across all four flow regimes by augmenting the effective angle of attack. The effective angle of attack, which was derived using a beam model to account for the effect of spanwise twisting deflections, effectively collapses the hydrodynamic load coefficients for the three hydrofoils. A generalized cavitation parameter, using the effective angle of attack, is used to collapse the lift and moment coefficients for all trials at a single immersed aspect ratio, smoothly bridging the four distinct flow regimes. None of the hydrofoils approached the static divergence condition, which occurs when the hydrodynamic stiffness negates the structural stiffness, but theory and experiments both show that ventilation increases the divergence speed by reducing the hydrodynamic twisting moment about the elastic axis. Coherent vortex shedding from the blunt trailing edge of the hydrofoil causes vortex-induced vibration at an approximately constant Strouhal number of 0.275 (based on the trailing edge thickness), and leads to amplified response at lock-in, when the vortex-shedding frequency approaches one of the resonant modal frequencies of the coupled fluid–structure system.

APA, Harvard, Vancouver, ISO, and other styles

32

Xiong, Yi Bo, Chun Ming Wang, and Lu Peng. "Numerical Simulation on Combined Deformation of Tip-Loaded Cantilever Beam with Particle Flow Code." Advanced Materials Research 378-379 (October 2011): 31–34. http://dx.doi.org/10.4028/www.scientific.net/amr.378-379.31.

Full text

Abstract:

In order to calculate the combined deformations of an Euler-Bernoulli cantilever beam subjected to bending moment, twisting moment, transverse load and axial load, particle flow code in 3 dimensions (PFC3D) is used with parallel bonds model. The computed deformations, including transverse deflections, rotations about axis, maximum normal and shear stresses, were compared with the analytical beam-theory solution in terms of axial tension, axial compression and none axial load, respectively. Between computed results and analytical beam-theory solution, the error bands are greater than 99.7% at the beam tip, while the error of the transverse deflection of the whole beam is less than 0.6%. So, the PFC3D is able to precisely simulate the combined deformation of cantilever beam, and this work has special reference to engineering calculations and designs when PFC is applied to model the mechanical behaviors of continuum materials.

APA, Harvard, Vancouver, ISO, and other styles

33

Wineman, Alan, and John Shaw. "A Correspondence Principle for Scission-Induced Stress Relaxation in Elastomeric Components." Journal of Applied Mechanics 71, no. 6 (November 1, 2004): 769–73. http://dx.doi.org/10.1115/1.1794701.

Full text

Abstract:

A method is presented for calculating the stress relaxation due to scission in elastomeric components that operate at a fixed deformation while at an elevated temperature. A relationship is established between stresses at different temperatures that is called the correspondence principle for scission/healing materials. Two examples involving cylinders illustrate its use. The first example involves combined tension-torsion, for which an axial force-twisting moment relation is derived, that might be useful in experimental studies to assess the applicability of the correspondence principle. The second example provides a criterion for estimating the lifetime of an annular seal.

APA, Harvard, Vancouver, ISO, and other styles

34

Boyarkin, O. M., and I. O. Boyarkina. "Solar neutrinos as indicators of the Sun’s activity." International Journal of Modern Physics A 34, no. 33 (November 30, 2019): 1950227. http://dx.doi.org/10.1142/s0217751x19502270.

Full text

Abstract:

Opportunity of the solar flares (SFs) prediction observing the solar neutrino fluxes is investigated. In three neutrino generations, the evolution of the neutrino flux traveling the coupled sunspots (CSs) which are the SF source is considered. It is assumed that the neutrinos possess both the dipole magnetic moment and the anapole moment while the magnetic field above the CSs may reach the values [Formula: see text] Gs, display the twisting nature and posses the nonpotential character. The possible resonance conversions of the solar neutrino flux are examined. Since the [Formula: see text] resonance takes place before the convective zone, its existence can in no way be connected with the SF. However, when the solar neutrino flux moves through the CSs in the preflare period, then it may undergo the additional resonance conversions and, as a result, depleting the electron neutrinos flux may be observed.

APA, Harvard, Vancouver, ISO, and other styles

35

Wang, Wei Zhang, and Hai Wen Wang. "Research on Fracturing Mechanism of Ground-Drive Screw Pump Polish Rod." Applied Mechanics and Materials 34-35 (October 2010): 1671–75. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1671.

Full text

Abstract:

In addition to vertical pulling force, the ground-drive screw pump oil recovery rod also stands twisting moment and bending moment. The diameter of the polish rod is generally larger than that of the pumping rod, and it stands a bit less stress than the pumping rod close to it, and the polish rod is generally made of relatively better materials. In practice, however, the polish rod fractures more often than the pumping rod above. This thesis considers that if the driving head deflects, the upper and the lower polish rods of the packing set are not in the same axial line, and bending moment will come into being in the polish rod of the lower part of the packing set due to the restriction of the polish rod by the packing set. Alternating stress caused by bending moment yields fatigue rupture of the polish rod during its rotation. This verdict is confirmed by the fracture position, the shape of the fractured surface, and quantitative calculation. This thesis proposes strict controlling of the deflection of the driving head by means of polish rod verticality survey instrument. Both theory and practice have proved that this method can effectively avoid fatigue rupture of the polish rod.

APA, Harvard, Vancouver, ISO, and other styles

36

Schilaty, Nathan D., Nathaniel A. Bates, Aaron J. Krych, and Timothy E. Hewett. "Frontal Plane Loading Characteristics of Medial Collateral Ligament Strain Concurrent With Anterior Cruciate Ligament Failure." American Journal of Sports Medicine 47, no. 9 (June 20, 2019): 2143–50. http://dx.doi.org/10.1177/0363546519854286.

Full text

Abstract:

Background: Both the anterior cruciate ligament (ACL) and the medial collateral ligament (MCL) bear load during athletic tasks of landing, cutting, pivoting, and twisting. As dynamic knee valgus is a purported mechanism for ACL injury, the MCL should bear significant strain load with valgus force. Hypothesis: The intact MCL will demonstrate a significant increase in strain upon failure of the ACL at 25° of knee flexion. Study Design: Controlled laboratory study. Methods: In vivo kinetics/kinematics of 44 healthy athletic participants were measured to determine stratification of injury risk (ie, low, medium, and high) in 3 degrees of knee forces/moments (knee abduction moment, anterior tibial shear, and internal tibial rotation). These stratified kinetic values were input into a cadaveric impact simulator to assess ligamentous strain during a simulated landing task. Uniaxial and multiaxial load cells and differential variable reluctance transducer strain sensors were utilized to collect mechanical data for analysis. Conditions of external loads applied to the cadaveric limbs were varied and randomized. Results: ACL strain increased with increased dynamic knee abduction moment (χ2[5] = 14.123, P = .0148). The most extreme dynamic knee abduction moment condition demonstrated significantly higher ACL strain compared with lower loaded trials ( P≤ .0203). Similarly, MCL strain increased with dynamic knee abduction moment (χ2[5] = 36.578, P < .0001). Matched-pairs analysis compared ACL strain with MCL strain (maximum ACL strain – maximum MCL strain) and demonstrated high strain for the ACL versus the MCL ( S177 = 6223.5, P < .0001). Conclusion: Although significant, MCL strain had minimal increase with increased dynamic knee abduction moment, and the event of ACL failure did not significantly increase MCL strain when compared with high dynamic knee abduction moment conditions in the cadaveric model. The ACL bears more strain than the MCL at increasing amounts of dynamic knee abduction moment at 25° of knee flexion, which may explain the limited concomitant MCL injury rate that can occur during a dynamic valgus collapse of the knee. Clinical Relevance: These characteristics of ACL and MCL strain are important to understand the mechanisms that drive these injuries at the knee and will improve rehabilitation and injury prevention techniques.

APA, Harvard, Vancouver, ISO, and other styles

37

Yasuhide, Shindo, and Tamura Hitoshi. "Singular twisting moment in a cracked thin plate under an electric current flow and a magnetic field." Engineering Fracture Mechanics 31, no. 4 (January 1988): 617–22. http://dx.doi.org/10.1016/0013-7944(88)90104-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Huang, Wenjun, Deli Gao, and Fengwu Liu. "Buckling Analysis of Tubular Strings in Horizontal Wells." SPE Journal 20, no. 02 (July 24, 2014): 405–16. http://dx.doi.org/10.2118/171551-pa.

Full text

Abstract:

Summary A new buckling equation in horizontal wells is derived on the basis of the general bending and twisting theory of rods. The boundary conditions of a long tubular string are divided into two categories: the sum of the virtual work of bending moment and shear force at the ends of tubular strings is equal to zero, and the sum of the virtual work of bending moment and shear force at the ends is not equal to zero. Buckling solutions under different boundary conditions are obtained by solving the new buckling model. For the boundary conditions of the first category, the buckling solutions are identical with previous results. For the boundary conditions of the second category, the buckling solutions are different from the results under the boundary conditions of the first category. The results indicate that buckling behaviors depend on both the axial force and the boundary conditions. Compared with previous results, buckling solutions of the new model provide a more comprehensive description of tubular-buckling behaviors.

APA, Harvard, Vancouver, ISO, and other styles

39

Bigoni, D., F. Dal Corso, D. Misseroni, and F. Bosi. "Torsional locomotion." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, no. 2171 (November 8, 2014): 20140599. http://dx.doi.org/10.1098/rspa.2014.0599.

Full text

Abstract:

One edge of an elastic rod is inserted into a friction-less and fitting socket head, whereas the other edge is subjected to a torque, generating a uniform twisting moment. It is theoretically shown and experimentally proved that, although perfectly smooth, the constraint realizes an expulsive axial force on the elastic rod, which amount is independent of the shape of the socket head. The axial force explains why screwdrivers at high torque have the tendency to disengage from screw heads and demonstrates torsional locomotion along a perfectly smooth channel. This new type of locomotion finds direct evidence in the realization of a ‘torsional gun’, capable of transforming torque into propulsive force.

APA, Harvard, Vancouver, ISO, and other styles

40

Jin, Yaqing, Jin-Tae Kim, Shifeng Fu, and Leonardo P. Chamorro. "Flow-induced motions of flexible plates: fluttering, twisting and orbital modes." Journal of Fluid Mechanics 864 (February 7, 2019): 273–85. http://dx.doi.org/10.1017/jfm.2019.40.

Full text

Abstract:

The unsteady dynamics of wall-mounted flexible plates under inclined flows was fundamentally described using theoretical arguments and experiments under various Cauchy numbers $Ca=\unicode[STIX]{x1D70C}_{f}bL^{3}U_{0}^{2}/(EI)\in [7,81]$ (where $\unicode[STIX]{x1D70C}_{f}$ is the fluid density, $b$ and $L$ are the plate width and length, $U_{0}$ is the incoming velocity, $E$ is Young’s modulus and $I$ is the second moment of the area) and inclination angles $\unicode[STIX]{x1D6FC}$. Three-dimensional particle tracking velocimetry and a high-resolution force sensor were used to characterize the evolution of the plate dynamics and aerodynamic force. We show the existence of three distinctive, dominant modes of tip oscillations, which are modulated by the structure dynamic and flow instability. The first mode is characterized by small-amplitude, planar fluttering-like motions occurring under a critical Cauchy number, $Ca=Ca_{c}$. Past this condition, the motions are dominated by the second mode consisting of unsteady twisting superimposed onto the fluttering patterns. The onset of this mode is characterized by a sharp increase of the force fluctuation intensity. At sufficiently high $Ca$ and $\unicode[STIX]{x1D6FC}$, the plate may undergo a third mode given by large-scale tip orbits about the mean bending. Using the equation of motion and first-order approximations, we propose a formulation to estimate $Ca_{c}$ as a function of $\unicode[STIX]{x1D6FC}$; it exhibits solid agreement with experiments.

APA, Harvard, Vancouver, ISO, and other styles

41

Tombak, A., and Y. A. Onur. "Investigation on the Mechanical Behavior of the Prestressing Strand by Finite Element Method." Journal of Engineering Sciences 7, no. 1 (2020): D1—D4. http://dx.doi.org/10.21272/jes.2020.7(1).d1.

Full text

Abstract:

Wire ropes that have a wide range of applications endure loads, stresses, strains, and moments while carrying out the duty of carrying loads. Wire ropes and strands are frequently used as load carrying elements due to their flexible structure and being reliable products. A prestressing steel strand is a form of the pattern of 1×6 helical wires which supply extra stiffness. Contact conditions between adjacent wires, helical geometry of wires at outer layers make it difficult to find the mechanic response of wire ropes or strands under axial load. A good way to overcome this difficulty is to perform a computer-aided simulation with finite element method. In this study, a prestressing strand having 11.11 mm diameter is computer-aided modeled by using SolidWorks, and then ANSYS Workbench is used to determine the mechanical response of the investigated rope strand. The findings indicate that results remained in the elastic region in all finite element simulations until the strain value of 0.00728. Keywords: prestressing strand, finite element method, tensile stress, strain, twisting moment.

APA, Harvard, Vancouver, ISO, and other styles

42

Velinsky, S. A. "Analysis of Fiber-Core Wire Rope." Journal of Energy Resources Technology 107, no. 3 (September 1, 1985): 388–93. http://dx.doi.org/10.1115/1.3231206.

Full text

Abstract:

A theory has been developed for the analysis of fiber-core wire rope with multilayered strands. The rope is subjected to both an axial force and an axial twisting moment. The previously developed linear theory for helically shaped wires is used and the equations governing compliance of the fiber core are formulated in a linear fashion. The resultant linear equations are easily solved. The theory is applied to a 6 × 19 Seale fiber-core wire rope and dimensionless results are presented. A load-deformation curve for a Seale fiber-core wire rope is obtained experimentally. Both the theoretically predicted effective modulus of elasticity and the predicted effective Poisson’s ratio of the rope compare favorably with the experimental results.

APA, Harvard, Vancouver, ISO, and other styles

43

Korte, A. P., E. L. Starostin, and G. H. M. van der Heijden. "Triangular buckling patterns of twisted inextensible strips." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 467, no. 2125 (June 23, 2010): 285–303. http://dx.doi.org/10.1098/rspa.2010.0200.

Full text

Abstract:

When twisting a strip of paper or acetate under high longitudinal tension, one observes, at some critical load, a buckling of the strip into a regular triangular pattern. Very similar triangular facets have recently been found in solutions to a new set of geometrically exact equations describing the equilibrium shape of thin inextensible elastic strips. Here, we formulate a modified boundary-value problem for these equations and construct post-buckling solutions in good agreement with the observed pattern in twisted strips. We also study the force–extension and moment–twist behaviour of these strips by varying the mode number n of triangular facets and find critical loads with jumps to higher modes.

APA, Harvard, Vancouver, ISO, and other styles

44

Jensen, A. E., J. Taby, K. Pran, G. Sagvolden, and G. Wang. "Measurement of Global Loads on a Full-Scale SES Vessel Using Networks of Fiber Optic Sensors." Journal of Ship Research 45, no. 03 (September 1, 2001): 205–15. http://dx.doi.org/10.5957/jsr.2001.45.3.205.

Full text

Abstract:

A method for measurement of global loads on a vessel, using strain measurements from a network of strain sensors and extensive Žnite-element analyses (FEA) with idealistic load cases, is presented. The sensors are attached at carefully selected locations at a cross section amidships, where the most signiŽcant loads have their maximum values. The Žnite-element (FE) strain values are used in precalculations to reduce the computational effort to solve a set of linear algebraic equations in real time. The method has been successfully tried out on the full-scale surface effect ship (SES) KNM Skjold (47 m, 270 tons, and 50 knots) instrumented with a network of Žber optic Bragg strain sensors. The seakeeping tests were performed in the North Sea (1999) in sea states 3, 5, and upper 6. Other parameters that were varied during the test program were the heading, forward speed, and on/off-cushion. The loads measured during the tests were the sagging/hogging moment, the horizontal bending moment, and the longitudinal twisting moment. The measured loads were compared with respective dimensioning loads based on DNV rules (HSLC) (1996). The results showed that when the vessel is subjected to bow flare slamming impacts, the sagging moment exceeded the DNV dimensioning value by a factor of 1.6, indicating that the HSLC rules do not provide conservative global loads when these extreme events occur. However, the peak loads were well within the design limits.

APA, Harvard, Vancouver, ISO, and other styles

45

Liu, Zhongyuan, Lie Luo, and Binqian Zhang. "An Aerodynamic Design Method to Improve the High-Speed Performance of a Low-Aspect-Ratio Tailless Aircraft." Applied Sciences 11, no. 4 (February 9, 2021): 1555. http://dx.doi.org/10.3390/app11041555.

Full text

Abstract:

This paper puts forward an aerodynamic design method to improve the high-speed aerodynamic performance of an aircraft with low-aspect-ratio tailless configuration. The method can ameliorate the longitudinal moment characteristics of the configuration by designing and collocating the key section airfoils with the constrains of fixed parameters of planform shape and capacity. Firstly, the effect of twisting the wing, fore-loading and aft-reflexing key section airfoils on the high-speed aerodynamic performance of the configuration is evaluated by high-fidelity numerical methods, and quantified by defining trimming efficiency factors. Then, a linear superposition formula is obtained by analyzing the effect rule of trimming efficiency factor, and based on the formula the design and collocation methods of key section airfoils are achieved. According to the methods, a trimmed configuration is obtained. The results of computational fluid dynamics (CFD) and wind tunnel tests show that the trimmed configuration has smaller zero-lift pitching moment and higher available lift-to-drag ratio than the initial configuration at cruise, besides the trimmed configuration achieves the design principle raised for tailless configuration, which can be described as the zero-pitching moment, cruising design lift coefficient, and maximum lift-to-drag ratio are coincident. In addition, at off-design conditions, the trimmed configuration shows favorable drag divergence characteristics, satisfactory aerodynamic characteristics at medium-altitude maneuvering condition, and good stall and pitching-moment performance at low speed state.

APA, Harvard, Vancouver, ISO, and other styles

46

Orlova, Olga. "THE EXPERIMENTAL RESEARCHES OF REINFORCED CONCRETE I-BEAM ELEMENTS WITH NORMAL CRACKS WHEN TURNING." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 2, no. 53 (October 31, 2019): 171–76. http://dx.doi.org/10.26906/znp.2019.53.1987.

Full text

Abstract:

The data of experimental researches of the rigidity of reinforced concrete I-beam elements with normal cracks at the action on them of the twisting moment have resulted in this paper. It is shown that the dependence "torque-twist angle" is almost linear. Significant nonlinear deformations appear in the last stages of loading before failure. Therefore at normative torques, it is recommended to consider the work of reinforced concrete elements of the I-beam cross-section with normal cracks linear. It is shown that the presence of longitudinal reinforcement affects the strength and rigidity of beams with normal cracks. Quite a large part of the external torque is perceived by the pin forces in the longitudinal reinforcement. The difference between the external torque and the moment of the pin forces in the armature is perceived by the upper shelf of the I-beam element. In the absence of longitudinal reinforcement, the upper shelf can collapse at loads much smaller than the destructive load of beams with longitudinal reinforcement.

APA, Harvard, Vancouver, ISO, and other styles

47

Shokri, Mojtaba, and Mahmod Edalati. "Comparison of Twisting Angle-Torsional Moment in Unstrengthened Reinforced Concrete Beams with Reinforced Concrete Beams Strengthened with CFRP Sheets." Journal of History Culture and Art Research 6, no. 1 (February 28, 2017): 43. http://dx.doi.org/10.7596/taksad.v6i1.702.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Ren, Yuan, and Jiancheng Fang. "High-Stability and Fast-Response Twisting Motion Control for the Magnetically Suspended Rotor System in a Control Moment Gyro." IEEE/ASME Transactions on Mechatronics 18, no. 5 (October 2013): 1625–34. http://dx.doi.org/10.1109/tmech.2012.2211376.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Swett, Geoffrey D., John F. Stanton, and Phillip S. Dunston. "Methods for Controlling Stresses and Distortions in Stage-Constructed Steel Bridges." Transportation Research Record: Journal of the Transportation Research Board 1712, no. 1 (January 2000): 164–73. http://dx.doi.org/10.3141/1712-20.

Full text

Abstract:

Widening and staged construction of steel bridges are becoming more frequent with today’s heavy traffic demands, right-of-way restrictions, and environmental constraints. Both construction practices require the addition of new girders to an existing structure. When new girders are added to an existing structure, inherent constructibility problems arise. The completed structure requires that the new girders, after placement of the new concrete deck, be aligned in both elevation and cross slope with the existing structure. Problems occur when the loading over the new girders is unbalanced, causing a torsional moment and twisting of the bridge. The twisting of the new girders may add undesirable vertical and horizontal displacements. Six design and construction methodologies for staged construction or widening of straight, steel girders are discussed. Research was initiated in response to construction problems experienced by the Washington State Department of Transportation (WSDOT). Several state highway agencies were surveyed, and the survey revealed that the problems experienced by WSDOT were not unique. The six methods are presented and the advantages, disadvantages, and applicable situations are discussed. A finite-element model was developed and used to compare calculated deflections with actual WSDOT case study field measurements. The model was then used to investigate the stresses and deformations for the six methods. A design paradigm is also presented for use in determining the appropriate method to be used for each particular situation.

APA, Harvard, Vancouver, ISO, and other styles

50

Hull, M. L., M. Swanstrom, and B. Wade. "Electromechanical Ski Release Binding With Mechanical Backup." Journal of Mechanical Design 119, no. 1 (March 1, 1997): 145–48. http://dx.doi.org/10.1115/1.2828779.

Full text

Abstract:

To better protect Alpine skiers against injuries to both the lower leg and the knee, the objective of this work was to design a binding which: (1) maintained a consistent release level in twist in the presence of combined loads; (2) released the heelpiece based on the anterior/posterior (A/P) bending moment transmitted by the leg; and (3) modulated the release level in twist depending on the degree of contraction in muscles crossing the knee. To fulfill the objective, a conventional ski binding was modified. Modifications included integrating dynamometers into the toepiece, anti-friction device (AFD), and heelpiece. The toepiece sensor indicates the twisting moment while the AFD and heelpiece sensors indicate the anterior bending moment transmitted by the leg. To gain electronic control of binding release, a solenoid actuated mechanism was added which translated the heelpiece rearward along the ski to decouple the boot from the binding. Otherwise, the binding allowed normal mechanical function. Prototype testing confirmed the ability of the dynamometers to accurately measure desired loads in the presence of extraneous loads and the reliability of the solenoid actuated mechanism in releasing the hoot under loads typical of skiing. Thus, this work demonstrated the feasibility of hybrid electromechanical/mechanical releasable bindings. Such a demonstration should encourage the development of designs for commercial use.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Twisting moment'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles