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Articoli di riviste sul tema "Dynamic loading"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 7 luglio 2024

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1

Vlasov, P. A. "Loading device for oncoming dynamic loading". Traktory i sel hozmashiny 81, n. 10 (15 ottobre 2014): 15–16. http://dx.doi.org/10.17816/0321-4443-65494.

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Methods of running and testing of parts, units and aggregates under load in case of transferring required drive torques through them are considered. The method of loading by oncoming drive torques using inertial loaders is theoretically substantiated.

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2

Moshier, Monty A., Ronald L. Hinrichsen e Gregory J. Czarnecki. "Dynamic Loading Methodologies". AIAA Journal 41, n. 11 (novembre 2003): 2291–94. http://dx.doi.org/10.2514/2.6823.

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3

Tsyganov, V. V. "FEATURES OF MECHANICS DESTRUCTION TRIBOUNITSAT DIFFICULT DYNAMIC LOADING". Eurasian Physical Technical Journal 20, n. 2 (44) (21 giugno 2023): 99–105. http://dx.doi.org/10.31489/2023no2/99-105.

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The mechanics of contact destruction tribounits at a friction in the conditions of difficult dynamicloading is considered. Possibilityof mathematical description of complex damage knots friction is shown, intensities of wear taking into account the features of forming superficial layer at a contact.Methodology of calculation superficial durability and longevity oftribounits is presented and the examples of practical estimation of this interdependence are shown.The model of destruction surface at a friction with a different dynamic loadingis offered, methods of estimation wearproofness on the change of the structural state of superficial layer by a tribospectral method and the electron work function.

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4

James, Ken. "Dynamic Loading of Trees". Arboriculture & Urban Forestry 29, n. 3 (1 maggio 2003): 165–71. http://dx.doi.org/10.48044/jauf.2003.020.

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The dynamic forces on tree structures during periods of high winds is being studied in order to determine the loads on trees and the responses of the trees to those dynamic loads. Field measurements of dynamic forces on trees, branches, and cables have been conducted on urban trees in an attempt to quantify the magnitude of these forces and to provide a basis for evaluating tree stability. Equipment was constructed to measure the dynamic wind loads on tree trunks and branches in situ. This equipment is described, and results are presented which indicate that tree structure is loaded by highly variable wind gusts and responds by behaving in a complex dynamic manner, which minimizes the energy transfer from the wind to the tree structure. The dynamic response of the tree involves a complex interaction of the natural frequencies of each component of the tree, including the trunk, main branches, sub-branches, and smaller sections. A dynamic model of trees is presented and includes mass damping that minimizes the sway energies and combines with the drag forces of the canopy to help the tree cope with large wind forces. A discussion of windthrow and tree dismantling is presented, based on the information collected from these studies.

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5

Heywood, Rob, Wayne Roberts e Geoff Boully. "Dynamic Loading of Bridges". Transportation Research Record: Journal of the Transportation Research Board 1770, n. 1 (gennaio 2001): 58–66. http://dx.doi.org/10.3141/1770-09.

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6

CRAWFORD, LYNDON. "PIPING UNDER DYNAMIC LOADING". Journal of the American Society for Naval Engineers 68, n. 2 (18 marzo 2009): 345–70. http://dx.doi.org/10.1111/j.1559-3584.1956.tb04033.x.

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7

Щельников, V. Shchelnikov, Мандрица, D. Mandritsa, Мандрица e P. Mandritsa. "Parameters Definition of Dynamic Loading of the Destroyed Part of a Plate of a Covering at Emergency Explosion on a Starting Complex". Safety in Technosphere 5, n. 5 (25 ottobre 2016): 48–53. http://dx.doi.org/10.12737/24151.

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The article considers questions of parameters definition of dynamic loading from the destroyed part of a plate of a covering at emergency Explosion on a starting complex. For the estimation of parameters of dynamic loading the approach based on an experimentally-theoretical estimation of parameters of pulse loading of contact explosion of a mix of components of rocket fuel is used. Dependences for an estimation of parameters of dynamic loading on overlapping of an underlying floor of a starting construction are defined; estimations of dynamic loading from the destroyed part of a covering of a starting construction are received at emergency explosion of mix КРТ. The method of definition of loadings and influences from the destroyed part of a plate of a covering on underlying designs is offered.

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8

Jeong, T. G., e D. B. Bogy. "Numerical Simulation of Dynamic Loading in Hard Disk Drives". Journal of Tribology 115, n. 3 (1 luglio 1993): 370–75. http://dx.doi.org/10.1115/1.2921645.

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The dynamic loading process in hard disk drives is simulated numerically. The effects of the slider’s loading velocity and initial pitch and roll on its dynamics during loading, as well as on slider-disk contacts, are studied by using the dynamic loading simulator. The air bearing forces due to the squeezing and shearing flows are calculated and their contributions to the dynamics of the slider during loading are investigated. Slider-disk contacts are considered in the numerical simulation through generalized impulse-momentum equations. Slider-disk contact criteria are obtained from the numerical simulation, and they are compared with those obtained from a previous experimental parameter study.

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9

Lin, I. H., e R. M. Thomson. "Dynamic cleavage in ductile materials". Journal of Materials Research 1, n. 1 (febbraio 1986): 73–80. http://dx.doi.org/10.1557/jmr.1986.0073.

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Ductile materials are found to sustain brittle fracture when the crack moves at high speed. This fact poses a paradox under current theories of dislocation emission, because even at high velocities, these theories predict ductile behavior. A theoretical treatment of time-dependent emission and cleavage is given which predicts a critical velocity above which cleavage can occur without emission. Estimates suggest that this velocity is in the neighborhood of the sound velocity. The paper also discusses the cleavage condition under mixed mode loading, and concludes that the cleavage condition involves solely the mode I loading, with possible sonic emission under such loadings

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10

Sabih, Saba. "Harmonic dynamic loading response of reinforced concrete column". MATEC Web of Conferences 162 (2018): 04024. http://dx.doi.org/10.1051/matecconf/201816204024.

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A reinforced concrete column is classified as compression structural element mostly analyzed and designed due to the applied combinations of dead and live loading with other considered loadings. Industries of considerable or relatively great size, production and electrical utilities are very concerned about the presence of dynamic loads in their electrical power systems. This behavior provides current with different components that are multiples of the fundamental frequency of the system which are called harmonics. Reinforced concrete elements such as column must be checked for the strength capacity and the response due to applied harmonic loading after completed the static analysis and design. In present article evaluations of reinforced concrete columns under the effects of dynamic harmonic loadings are studied. The main parameters are the reinforcement ratio and harmonic ranged loadings. Finite elements approach was adopted to analyze the columns by ANSYS software and all models are simulated in three dimensions. The analysis results indicated that the square cross sections with that rectangular of the same cross sectional area are closed in performance against static and dynamic loadings.

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11

CHANG, SHUENN-YIH. "CAPABILITY TO CAPTURE DYNAMIC LOADING IN LINEAR DYNAMIC ANALYSIS OF SINGLE DEGREE OF FREEDOM SYSTEMS". International Journal of Structural Stability and Dynamics 13, n. 05 (28 maggio 2013): 1350012. http://dx.doi.org/10.1142/s0219455413500120.

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In this work, the importance of the capability to capture dynamic loading for an integration method is emphasized. In a step-by-step integration procedure, amplitude distortions in the transient and steady-state responses depend on the step discretization error of dynamic loading for each time step. Correlations between amplitude distortion and step discretization error for dynamic loadings are analytically established for a specified integration method. These correlations may be considered as the basic numerical properties in evaluating a step-by-step integration method. As a result, the superiority of the previously published algorithm (PPA) [S. Y. Chang, Int. J. Numer. Meth. Eng.77(8) (2009) 1100–1120] over its modified form and the member of Newmark family method (MNM) with β = γ = 1/2 in capturing dynamic loading is analytically verified (even though the three algorithms have exactly the same characteristic equation).

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12

Markov, Iliyan, e Kalin Radlov. "About effect of dynamic loading caused by concrete pump on bending moments, anchor forces and deformations in single level anchored retaining wall". IOP Conference Series: Materials Science and Engineering 1297, n. 1 (1 dicembre 2023): 012005. http://dx.doi.org/10.1088/1757-899x/1297/1/012005.

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Abstract This paper explore effect of dynamic loading caused by concrete pump on bending moments, anchor forces and deformations in single level anchored retaining wall. Dynamic loading is obtained by using a special developed dynamic mathematical model of truck-mounted concrete pump, by means of which are calculated the maximal dynamic loadings (acceleration and forces), which are transferred from concrete pump to the soil, and from there accordingly – from soil to the retaining wall under consideration. After that is performed a detailed finite element analysis of the retaining wall, by using software product Plaxis 3D, during which are analyzed the variation of bending moments, anchor forces and deformations in single level anchored retaining wall and after dynamic loading applying. There is also a numerical example considered, for which are calculated the maximal dynamic loadings, which are transferred from concrete pump to the soil, and from ground supports to the retaining wall. An amplification factor (dynamic factor) due to dynamic effects is calculated, by which is necessary to be multiplied the static loadings caused by concrete pump on soil. In the conclusion is made a qualitative assessment of the dynamic influence of concrete pump on the soil and the retaining wall section and ground anchor.

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13

Peng, Kang, Ke Gao, Jian Liu, Yujiao Liu, Zhenyu Zhang, Xiang Fan, Xuyan Yin, Yongliang Zhang e Gun Huang. "Experimental and Numerical Evaluation of Rock Dynamic Test with Split-Hopkinson Pressure Bar". Advances in Materials Science and Engineering 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/2048591.

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Feasibility of rock dynamic properties by split-Hopkinson pressure bar (SHPB) was experimentally and numerically evaluated with ANSYS/LS-DYNA. The effects of different diameters, different loading rates, and different propagation distances on wave dispersion of input bars in SHPB with rectangle and half-sine wave loadings were analyzed. The results show that the dispersion effect on the diameter of input bar, loading rate, and propagation distance under half-sine waveform loading is ignorable compared with the rectangle wave loading. Moreover, the degrees of stress uniformity under rectangle and half-sine input wave loadings are compared in SHPB tests, and the time required for stress uniformity is calculated under different above-mentioned loadings. It is confirmed that the stress uniformity can be realized more easily using the half-sine pulse loading compared to the rectangle pulse loading, and this has significant advantages in the dynamic test of rock-like materials. Finally, the Holmquist-Johnson-Concrete constitutive model is introduced to simulate the failure mechanism and failure and fragmentation characteristics of rock under different strain rates. And the numerical results agree with that obtained from the experiment, which confirms the effectiveness of the model and the method.

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14

SHIRAI, Yuki, e Kazushi SHIMAZAKI. "EVALUATION BY STATIC LOADING AND DYNAMIC LOADING EXPERIMENTS". AIJ Journal of Technology and Design 26, n. 62 (20 febbraio 2020): 136–40. http://dx.doi.org/10.3130/aijt.26.136.

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15

Mei, Huihao, Wuming Leng, Rusong Nie, Renpan Tu, Yafeng Li e Junli Dong. "Experimental research on the dynamic response characteristics of the transition subgrade induced by heavy-haul train passage". Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 233, n. 9 (25 gennaio 2019): 974–87. http://dx.doi.org/10.1177/0954409718822924.

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The dynamic response of the subgrade under moving train loads provides information on subgrade settlement prediction, condition evaluation, and so forth. This paper presents the field dynamics tests on the transition subgrade in the Shuo-Huang heavy-haul railway in China. The variation characteristics of the peak dynamic displacements along the track and subgrade slope were analyzed, and the random distribution characteristics of the peak dynamic displacements at the subgrade shoulder were studied. The response characteristics of the subgrade during the train passage were investigated, and the attenuation regularities of vibration along the subgrade slope were identified. The results indicated that the action of the train moving loads on the subgrade has obvious periodicity, and two bogies in the adjacent wagons should be considered as one loading unit. The peak dynamic displacements at the subgrade shoulder obey normal distribution under the repeated loading of the loading unit. The subgrade bed is dramatically influenced by the dynamic loadings of the trains, and the moving train loads have little influence on the part below the subgrade bed. The results of the research provide the basis for the evaluation of instantaneous and long-term dynamic stability of the subgrade and offer guidance for simulating train moving loads in the model test and numerical analysis to study the dynamic response of the subgrade.

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16

Li, Ziyun, Yunhui Zhu, Qianghui Song, Peiyong Wang e Dongyan Liu. "Dynamic Mechanical Properties and Failure Characteristics of Sandstone with Pre-Flaws Parallel to the Loading Direction". Sustainability 15, n. 4 (15 febbraio 2023): 3587. http://dx.doi.org/10.3390/su15043587.

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Investigations on rock dynamics have been comprehensively focused on when the dynamic impact is perpendicular to the trend of the flaws, while understanding the dynamic mechanical properties and failure characteristics of rock with pre-flaws parallel to the loading direction remains unrevealed. In this study, impact tests are performed to experimentally study the dynamic mechanical properties, failure characteristics, and energy evolution of pre-flawed sandstone using the split Hopkinson pressure bar (SHPB) apparatus, in which the pre-flaws are parallel to the loading direction. The results show that for specimens, the dynamic loading rate and the number of flaws greatly influence the dynamic strength, peak strain, energy absorption rate, and failure behaviors. The dynamic strength increases exponentially with an increase in loading rate and decreases with an increase in flaw numbers. The fractal dimension of triple-flawed specimens is the largest at the same loading rate range. The failure modes of different pre-flawed specimens show a transition from tensile failure to tensile-shear failure with the increase of dynamic loading rate.

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17

Raovic, Nevena, Otto Anker Nielsen e Carlo Giacomo Prato Carlo Giacomo Prato. "DYNAMIC QUEUING TRANSMISSION MODEL FOR DYNAMIC NETWORK LOADING". Transport 32, n. 2 (13 luglio 2015): 146–59. http://dx.doi.org/10.3846/16484142.2015.1062417.

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This paper presents a new macroscopic multi-class dynamic network loading model called Dynamic Queuing Transmission Model (DQTM). The model utilizes ‘good’ properties of the Dynamic Queuing Model (DQM) and the Link Transmission Model (LTM) by offering a DQM consistent with the kinematic wave theory and allowing for the representation of multiple vehicle classes, queue spillbacks and shock waves. The model assumes that a link is split into a moving part plus a queuing part, and p that traffic dynamics are given by a triangular fundamental diagram. A case-study is investigated and the DQTM is compared with single-class LTM, single-class DQM and multi-class DQM. Under the model assumptions, single-class models indicate that the LTM and the DQTM give similar results and that the shock wave property is properly included in the DQTM, while the multi-class models show substantially different travel times for two vehicle classes. Moreover, the results show that the travel time will be underestimated without considering the shock wave property.

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18

Wang, Huai Liang, e Jun Yu Yuan. "Dynamic Failure Surface of Concrete under Multiaxial Dynamic Loads". Advanced Materials Research 261-263 (maggio 2011): 228–32. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.228.

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Study on the dynamic behavior of concrete is important, for the sake of seismic design and safety evaluation of mass concrete structures, such as concrete dams, nuclear reactors and so on. There have been a lot of uniaxial strength experiment data of concrete under dynamic loading, but multiaxial data is scarce, for the test of multiaxial strength of concrete under dynamic loading is difficult, while most mass structures work under multiaxial static and dynamic stress states. In this paper a three-dimension failure criterion of concrete under dynamic loading in octahedral stress space was proposed. Then the multixial strength tests of concrete under dynamic loading were carried out with concrete triaxial static and dynamic apparatus system. The selected loading paths consisted of uniaxial compression and tension, biaxial proportional loading compression, biaxial compression with one constant lateral compression and triaxial compression with two constant lateral compressions. In the test the strain rate range is 10-5~10-2/s. Based on the test data and the literature data, the characteristic of this failure surface is that it considered the influence of the strain rate and the angle of similarity; it is smooth, convex in meridian and deviatoric plane. The proposed model for nonlinear dynamic analysis and design of mass concrete structures under dynamic loading is useful.

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19

Govardhan, T., Achintya Choudhury e Deepak Paliwal. "Load Distribution in a Rolling Element Bearing under Dynamic Radial Load". Applied Mechanics and Materials 592-594 (luglio 2014): 1099–103. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1099.

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External load in a bearing is transferred from one race to another race through the rolling elements. In the present work, an investigation has been made to estimate the load on a rolling element in a bearing subjected to dynamic loading. The dynamic loading, in the present study, included harmonic and periodic loadings which are deterministic functions of time. The roller load is also investigated under random loading with known statistical values of mean and variance. Numerical values have been obtained for NJ204 bearing with known radial clearance. These results show the variation in the spectra obtained for different nature of external loadings. These results can be expected to satisfy the difference in theoretical and experimental spectra obtained by earlier researchers.

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20

Gao, Lian-sheng, Han-cheng Dan e Liang Li. "Response Analysis of Asphalt Pavement under Dynamic Loadings: Loading Equivalence". Mathematical Problems in Engineering 2019 (18 luglio 2019): 1–15. http://dx.doi.org/10.1155/2019/7020298.

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This paper establishes the equivalent relationships between the half-sinusoidal load, triangular load, vertical stepwise load, and moving traffic load. The governing equation was established for analyzing the dynamic responses of pavement, and half-sinusoidal load, triangular load, and vertical stepwise load functions were transformed into Fourier series expressions. The partial differential governing equations were simplified as ordinary differential equations and the analytical solutions were obtained. Further, the solutions were validated through comparing the theoretical results with numerical simulated results. Calculation results revealed that, for unchanged load periods, increasing the amplitudes of the three loads by 1.06, 1.31, and 1.35 times can better simulate the moving traffic loads. For unchanged load function amplitudes, increasing the function periods by 1.07, 2.23, and 2.1 times (for half-sinusoidal, triangular, and vertical stepwise loads, resp.) can improve the simulation performance. The fatigue life of asphalt pavements under the moving traffic load agrees with that of the three load simulations, indicating that the fatigue life of asphalt pavements is only associated with the load amplitude but not the load patterns.

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21

Kang, Moon Ki. "Shear Resistance of CIP Anchors under Dynamic Loading: Unreinforced Anchor". Journal of Korean Society of Steel Construction 26, n. 1 (2014): 11. http://dx.doi.org/10.7781/kjoss.2014.26.1.011.

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Kang, Moon Ki. "Shear Resistance of CIP Anchors under Dynamic Loading: Reinforced Anchor". Journal of Korean Society of Steel Construction 26, n. 1 (2014): 21. http://dx.doi.org/10.7781/kjoss.2014.26.1.021.

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23

Throne, J. L., e R. C. Progelhof. "Closed-Cell Foam Behavior Under Dynamic Loading—II. Loading Dynamics of Low-Density Foams". Journal of Cellular Plastics 21, n. 1 (gennaio 1985): 43–50. http://dx.doi.org/10.1177/0021955x8502100105.

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24

Celikoglu, H. B. "A Dynamic Network Loading Model for Traffic Dynamics Modeling". IEEE Transactions on Intelligent Transportation Systems 8, n. 4 (dicembre 2007): 575–83. http://dx.doi.org/10.1109/tits.2007.903051.

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Meng, Meng, Stefan Z. Miska, Mengjiao Yu e Evren M. Ozbayoglu. "Fully Coupled Modeling of Dynamic Loading of the Wellbore". SPE Journal 25, n. 03 (14 novembre 2019): 1462–88. http://dx.doi.org/10.2118/198914-pa.

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Summary Loadings acting on a wellbore are more realistically regarded as dynamic rather than static, and the wellbore response under dynamic loading can be different from that under static loading. Under dynamic loading, the inertia term should be considered and the changing rate of loading could induce a change in the mechanical properties of the wellbore, which might compromise wellbore stability and integrity. In this paper, a fully coupled poroelastodynamic model is proposed to study wellbore behavior. This model not only considers fully coupled deformation/diffusion effects, but also includes both solid and fluid inertia terms. The implicit finite-difference method was applied to solve the governing equations, which allows this model to handle all kinds of dynamic loading conditions. After modifying the existing code only slightly, our numerical solution can neglect inertia terms. The numerical results were validated by comparing them to the analytical solution with a simulated sinusoidal boundary condition. To understand this model better, a sensitivity analysis was performed, and the influence of inertia terms was investigated. After that, the model was applied to analyze wellbore stability under tripping operations. The results show that the inertial effect is insignificant for tripping and a fully coupled, quasistatic model is recommended for wellbore stability under tripping operations. The fully coupled poroelastodynamic model should be used for rapid dynamic loading conditions, such as earthquakes and perforations.

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Yan, Dong Ming, e Gao Lin. "Failure Mechanism of Concrete in Dynamic Loading". Key Engineering Materials 324-325 (novembre 2006): 623–26. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.623.

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Understanding the dynamic behavior of concrete in rapid loading is an issue of great importance in civil engineering. In this study, an experimental program was performed to investigate the dynamic behavior of concrete subjected to different strain-rate loadings. From the test results the rate-dependent effect on the ultimate strength of concrete was confirmed, i.e., the strength increases with the increasing strain rate. The dynamic failure process of concrete in tension and physical mechanism were discussed based on the experimental observations.

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Zhang, Jian, Guo-Kai Yuan, Songye Zhu, Quan Gu, Shitang Ke e Jinghua Lin. "Seismic Analysis of 10 MW Offshore Wind Turbine with Large-Diameter Monopile in Consideration of Seabed Liquefaction". Energies 15, n. 7 (30 marzo 2022): 2539. http://dx.doi.org/10.3390/en15072539.

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With the increasing construction of large-scale wind turbines in seismically active coastal areas, the survivability of these high-rated-power offshore wind turbines (OWTs) in marine and geological conditions becomes extremely important. Although research on the dynamic behaviors of OWTs under earthquakes has been conducted with consideration of the soil-structure interaction, the attention paid to the impact of earthquake-induced seabed liquefaction on OWTs supported by large-diameter monopiles remains limited. In view of this research gap, this study carries out dynamic analyses of a 10 MW OWT under combined wind, wave, and earthquake loadings. This study uses a pressure-dependent multisurface elastoplastic constitutive model to simulate the soil liquefaction phenomenon. The results indicate that the motion of the large-diameter monopile leads to more extensive soil liquefaction surrounding the monopile, specifically in the zone near the pile toe. Moreover, compared with earthquake loading alone, liquefaction becomes more severe under the coupled wind and earthquake loadings. Accordingly, the dynamic responses of the OWT are apparently amplified, which demonstrates the importance of considering the coupling loadings. Compared with wind loading, the effect of wave loading on the dynamic response and liquefaction potential is relatively insignificant.

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Reilly, Donald T. "Dynamic Loading of Normal Joints". Rheumatic Disease Clinics of North America 14, n. 3 (dicembre 1988): 497–502. http://dx.doi.org/10.1016/s0889-857x(21)00861-9.

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Pushkov, Victor, Alexey Yurlov, Andrew Okinchits e Tatiana Naydanova. "Beryllium strain under dynamic loading". EPJ Web of Conferences 94 (2015): 02002. http://dx.doi.org/10.1051/epjconf/20159402002.

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Belikova, A. F., S. N. Buravova e E. V. Petrov. "Strain localization under dynamic loading". Technical Physics 58, n. 8 (agosto 2013): 1152–58. http://dx.doi.org/10.1134/s1063784213080057.

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Vakili, Fazlollah, Michael R. Viles, Jerry L. Reding e Neal G. Sheery. "Dynamic Thermal Line Loading Monitor". IEEE Power Engineering Review PER-6, n. 5 (maggio 1986): 35. http://dx.doi.org/10.1109/mper.1986.5527934.

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Černý, Michal, Josef Filípek e Pavel Mazal. "Dynamic loading of galvanized parts". Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 58, n. 1 (2010): 33–42. http://dx.doi.org/10.11118/actaun201058010033.

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This work is divided into two parts: the theoretical part includes actual knowledge and points of view about degradation processes in construction materials, anticorrosion protection, zinc coat composition and high frequency fatigue. The laboratory part follow-up existing regulations contents Czech standards and formulate specifications for acquisition of objective information from acceleration laboratory tests in condensation chests, mechanical high frequency fatigue tests on pulsator machine and possibilities of evaluation of fatigue tests. Laboratory findings declare to fundamental types of damage of constructions with anticorrosion protection in real loading conditions with dynamic high frequency character. Laboratory tests were made in sulphide and chloride environments.

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Irvine, Max. "Dynamic loading on bucketwheel reclaimers". International Journal of Impact Engineering 15, n. 3 (gennaio 1994): 281–96. http://dx.doi.org/10.1016/s0734-743x(05)80018-1.

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Buravova, S. N., A. A. Goncharov e Ju N. Kiselev. "Surface damage under dynamic loading". Tribology International 29, n. 5 (agosto 1996): 357–63. http://dx.doi.org/10.1016/0301-679x(95)00062-9.

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Le Bouteiller, Caroline, e Mohamed Naaim. "Aggregate breakage under dynamic loading". Granular Matter 13, n. 4 (5 dicembre 2010): 385–93. http://dx.doi.org/10.1007/s10035-010-0235-2.

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Vakili, Fazlollah, Michael R. Viles, Jerry L. Reding e Neal G. Sherry. "Dynamic Thermal Line Loading Monitor". IEEE Transactions on Power Systems 1, n. 2 (1986): 62–66. http://dx.doi.org/10.1109/tpwrs.1986.4334902.

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Johannesson, Tomas, e Martin Distner. "Dynamic Loading of Synchronous Belts". Journal of Mechanical Design 124, n. 1 (1 maggio 2000): 79–85. http://dx.doi.org/10.1115/1.1426088.

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In automotive timing belt drives friction history effects must be taken into concern due to rapidly changing loads. Here a spring based model capable of handling dynamic load conditions is presented. The model also covers partial meshing effects and utilizes Coulomb friction. The model shows good agreement with experimental data found in literature. It is proven that when simulating synchronous belt drives during rapidly changing load conditions, using models for quasi-static load conditions stepwise are not sufficient.

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Yokota, Hiroki, Andrés Tovar e Alexander Robling. "Dynamic muscle loading and mechanotransduction". Bone 51, n. 4 (ottobre 2012): 826–27. http://dx.doi.org/10.1016/j.bone.2012.07.025.

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39

Wang, Yanbing, Xingyuan Zhou, Ji Kong e Bingbing Yu. "Dynamic Fracture Experiment of Fractured Rock under Dynamic Loading". Shock and Vibration 2020 (14 febbraio 2020): 1–22. http://dx.doi.org/10.1155/2020/9761650.

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Abstract (sommario):

In order to examine the dynamic mechanical properties, dynamic crack proposition process, and energy loss of fractured rock under dynamic loading, the specimens with different fracture dig angles were processed with Φ50 mm × 50 mm cylindrical sandstone, the impact loading test was conducted on 50 mm stem diameter split Hopkinson pressure bar (SHPB) experiment platform, and the whole process of crack propagation and dynamic failure was recorded using a high-speed camera. As a result, the dynamic mechanical properties such as stress wave fluctuation characteristics, peak strength and stress-strain relationship, crack initiation angle, stress and other dependencies with prefabricated fracture angle of the prefabricated fracture specimens under high strain rate were obtained, and the incident energy, absorbed energy, and energy absorption rates were compared to investigate the energy loss law in the dynamic loading; on the contrary, the effects of different loading rates on the dynamic mechanical properties of the sandstone specimens were identified, and finally a set of findings were presented.

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40

Koo, J. Y., e C. G. Kang. "Forming of Metallic Bipolar Plates by Dynamic Loading". Transactions of Materials Processing 21, n. 1 (1 febbraio 2012): 5–12. http://dx.doi.org/10.5228/kstp.2012.21.1.5.

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41

O’Hara, G. Peter. "Dynamic Analysis of a 155 mm Cannon Breech". Shock and Vibration 8, n. 3-4 (2001): 215–21. http://dx.doi.org/10.1155/2001/421852.

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Abstract (sommario):

This report describes a finite element analysis of the breech closure for the 155 mm Cannon M199, which is normally mounted on the Towed Howitzer M198. In this configuration it has has an excellent record for reliability in the field and is easy to service. However when the breech is used in an ammunition test environment, some maintenance problems exist. The analysis is for a 9 body problem with 13 contact surfaces and was solved for both static and dynamic load cases. The two dynamic loads were of similar shape with different loading times. The 9 bodies in the model include, a facility mount, four major structural components, the obturator seal and 3 minor components. The results show that the major components are normally subjected to quasi-static loading but under fast `pressure spike' loadings, the dynamic effect can be important. This is particularly true for the contact between minor components which can show extreme behavior with the fast loading rates.

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42

Chen, W. H., Z. R. Lu, S. H. Chen, Y. Q. Ni e W. Y. Liao. "Monitoring Dynamic Characteristics for a Supertall Structure under Different Loading Events". Advanced Materials Research 243-249 (maggio 2011): 5356–59. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.5356.

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Abstract (sommario):

The Guangzhou New TV Tower (GNTVT), completed its construction in May 2009 in Guangzhou China, is a super tall tube-in-tube structure with a total height of 600m. A complicated structural health monitoring (SHM) system consisting of over 700 sensors has been implemented to the GNTVT for both in-construction and in-service real-time monitoring. This implemented SHM system has monitored the structural responses of the GNTVT after having completed its construction under different loading events (the typhoon, the earthquake and normal wind loading conditions). Firstly, the time history and PSD of the acceleration response under different loading events have been compared. Secondly, the modal properties (modal frequencies, mode shapes, and damping ratios) of the structure under different loading events have been identified. The results of this paper supply some references for better understanding the dynamic characteristics of supertall under different loadings.

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43

Chen, Fengxiao, Jitang Fan, David Hui, Chao Wang, Fuping Yuan e Xiaolei Wu. "Mechanisms of the improved stiffness of flexible polymers under impact loading". Nanotechnology Reviews 11, n. 1 (1 gennaio 2022): 3281–91. http://dx.doi.org/10.1515/ntrev-2022-0437.

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Abstract The flexible polymers have an outstanding impact-resistant performance because of the improved stiffness upon a high speed loading. At the aspect of microstructure, the soft segments make an important contribution. In this article, molecular dynamics simulation is carried out to reveal the dynamic mechanical behavior of a mono helical soft segment. The tensile loadings at various strain rates are conducted. The stress–strain relations and strain rate dependencies of mechanical properties are derived. The evolution of potential energy with straining accompanied by the disentanglement of molecular chain is characterized. The characteristic molecular chain of dynamic mechanical response is determined. The intrinsic physical origins of straightening of characteristic molecular chain and bond angle expansion are explored. New parameters are defined to quantitatively analyze the micro mechanisms and their rate dependencies, which are linked to the dynamic mechanical properties. This work is full of interest to fill a knowledge gap of the physical origins of dynamic mechanical behavior of flexible polymers.

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44

Wang, Yanfeng, Xiaohui Wu, Shaofeng Ji, Faping Xiao e Dayang Wang. "Evaluation of Mechanical Performance of a New Disc Spring-Cable Counter Pressure Shock Absorber". Applied Sciences 13, n. 15 (28 luglio 2023): 8718. http://dx.doi.org/10.3390/app13158718.

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Abstract (sommario):

Mechanical performance evaluation of a new disc spring-cable counter pressure shock absorber is focused on in this study. The proposed shock absorber is always in a compressive working state with energy dissipation capacity under both tension and compression loadings. The design formulas of its axial bearing capacity, vertical stiffness, deformation energy of the shock absorber were derived, and the corresponding specific design process was provided in detail. Experimental and numerical investigations of the mechanical performance were conducted under static and dynamic loadings. The parameters influencing the laws of the mechanical performance of the shock absorber, including loading frequency, pre-compression deformation and loading amplitude, were investigated. The rationality of the proposed shock absorber was firstly verified through comparative analysis using experimental, numerical and theoretical calculations. The shock absorber with a friction coefficient of 0.005 between disc springs, and a friction coefficient of 0.3 between the disc spring and cover plate has the smallest error between experiment and theory for the flattening force. The bearing capacity of the shock absorber exhibits a linear relationship with the loading displacement in static loading. In dynamic loading, however, the bearing capacity shows a trend of slow growth followed by rapid growth. The energy dissipation capacity of the shock absorber shows an increase with the increase of loading displacement. The minimum equivalent damping ratio of all of the dynamic test cases is 7%, with a maximum up to 15.3%. Under the same loading frequency, the equivalent stiffness and equivalent damping ratio have a linear amplification trend with the increase of pre-compression deformation, and the maximum increase of equivalent stiffness is equal to 41.37%. Under the same loading frequency and pre-compression deformation, the energy consumption capacity can be improved by increasing the loading amplitude.

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45

Ting, John M., Claudia R. Kauffman e Maryann Lovicsek. "Centrifuge static and dynamic lateral pile behaviour". Canadian Geotechnical Journal 24, n. 2 (1 maggio 1987): 198–207. http://dx.doi.org/10.1139/t87-025.

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Abstract (sommario):

The behaviour of a single vertical pile embedded in saturated sand and subjected to cyclic static and dynamic loading is studied using an extensive centrifuge model testing program. A reliable data reduction method allows computation of the dynamic and static cyclic lateral pile resistance–deflection p–y curves. The results are compared with full-scale dynamic test results and oil industry design guidelines.From these comparisons, the centrifuge technique appears to model the dynamic soil–pile system properly. For loadings causing significant nonlinearity, the static stiffness appears to be greater than the dynamic stiffness, while material hysteresis appears about the same in each case. Current American Petroleum Institute guidelines for static cyclic loading appear to overestimate the dynamic lateral resistance for medium dense sands. Key words: centrifuge model, cyclic loads, dynamic response, lateral loads, liquefaction, model tests, pile lateral loads.

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46

Horr, A. M., A. Yibulayin e P. Disney. "Nonlinear spectral dynamic analysis of guyed towers. Part II: Manitoba towers case study". Canadian Journal of Civil Engineering 31, n. 6 (1 dicembre 2004): 1061–76. http://dx.doi.org/10.1139/l04-084.

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Abstract (sommario):

Dynamic response of large complex space structures under wind loading is important in terms of performance and safety. Conventional method of wind loading calculation has been used successfully in codes to analyze large space structures. The method can be applied by approximating the air pressure, induced by wind, on the surfaces of structures. Although this replaces a wind loading test using complicated wind tunnel tests for any structural systems, the accuracy of the method, in the case of complex geometry guyed tower structures, is a matter of consideration. Hence, it is desirable to search for a procedure with more accuracy and reliability. In this respect, attention is paid to the advanced spectral element method and the computational fluid dynamics. Using the proposed formulation, a material and geometric nonlinear dynamic analyses have been performed to simulate post-buckling behaviours and also collapse modes for series of Manitoba Hydro's guyed towers under extreme wind loading conditions. Key words: computational fluid dynamics, wind loading, collapse mode, nonlinear analysis, post-buckling.

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47

Song, Xi Xian, Yu Jun Zuo, Wan Cheng Zhu, Cheng Yu Jiang e Pai Ke Wen. "Numerical Simulation on Effect of Pressure-Released Hole Combined Support with Rockbolt by Dynamic Loading". Applied Mechanics and Materials 490-491 (gennaio 2014): 789–93. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.789.

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Abstract (sommario):

In order to study the effect on the structure of pressure-released hole combined support with rockbolt under dynamic loading, utilize RFPA2D-Dynamics on a numerical simulation of dynamic responses of roadway surrounding rock under different depths and different continued time of stress wave and different amplitudes of stress wave. It had gained the general law of the stress redistribution of roadway surrounding rock under static-dynamic coupling loading, and analysed the damage effect of static-dynamic coupling loading to surrounding rock from the perspective of acoustic emission energy release and failure units. Studies show that dynamic disturbance is the main inducing factor on instability of deep roadway supported by pressure-released hole combined support with rockbolt, the waveform of dynamic stress has important influence on broken surrounding rock, with the stress amplitude is the higher and the action time is longer, dynamic disturbance on stability of roadway bring about more significant effect would become.

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48

Fujikake, Kazunori, e Amornthep Somraj. "Dynamic Shear Resistance of RC Beams Based on Modified Compression Field Theory". Key Engineering Materials 711 (settembre 2016): 799–805. http://dx.doi.org/10.4028/www.scientific.net/kem.711.799.

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Abstract (sommario):

The aim of this study was to develop an analytical model to estimate the dynamic shear capacity of RC beams which may exhibit diagonal tension failure under impact and blast loadings. Thus, the modified compression field theory has been extended to dynamic loading in this study. The developed analytical model has been applied to the experimental results obtained from rapid loading tests of RC beams. As a result, the developed analytical model has been in good agreement with the experimental results.

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49

Singh, D. K., e A. Mandal. "Dynamic Effect of Soil-Tunnel Interface Under Dynamic Loading". Soil Mechanics and Foundation Engineering 56, n. 2 (maggio 2019): 91–97. http://dx.doi.org/10.1007/s11204-019-09575-w.

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50

Chernobryvko, Marina, Leopold Kruszka e Yuorii Vorobiev. "Thermo-Elastic-Plastic Constitutive Model for Numerical Analysis of Metallic Structures under Local Impulsive Loadings". Applied Mechanics and Materials 566 (giugno 2014): 493–98. http://dx.doi.org/10.4028/www.scientific.net/amm.566.493.

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Abstract (sommario):

The tasks of dynamic behavior of constructions’ elements under the impulsive loadings modeling are examined. Mathematical models are taken into account to calculate thermo-elastic-plastic deformations, dynamic properties of materials, large deformations and strains. Numerical calculations of the dynamic stress-strain state for steel constructions are conducted for a local impulsive loading.

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