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Journal articles on the topic 'High-frequency loading'

Author: Grafiati

Published: 28 June 2021

Last updated: 8 February 2022

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1

Minhas, Zill-e. Hasnain, and Sun Qin. "Temperature Evolution in High Frequency Mechanical Loading." Advanced Materials Research 664 (February 2013): 866–70. http://dx.doi.org/10.4028/www.scientific.net/amr.664.866.

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A generic heat generation equation with the heat transfer has been developed for pure mechanical loading. Frequency dependent temperature field can be obtained on a specimen subjected to pure mechanical, cyclic or non-cyclic loading. Results have been compared with the literature and a good agreement has been found with the experimental results. Applications and effectiveness of the equation is highlighted in predicting the fatigue damage in case of high cyclic or vibration fatigue.

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2

Davidenko, P. M., V. B. Strutinskii, and V. I. Rashkulev. "Hydraulic jet pulser with high loading frequency." Strength of Materials 17, no. 4 (April 1985): 573–76. http://dx.doi.org/10.1007/bf01533965.

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3

Baum, H.-P., Y. J. Qian, M.-F. Xu, A. Schenstrom, M. Levy, and Bimal K. Sarma. "Top-Loading Dilution Refrigerator for High Frequency Measurements." Japanese Journal of Applied Physics 26, S3-2 (January 1, 1987): 1731. http://dx.doi.org/10.7567/jjaps.26s3.1731.

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4

Cairns, A. M., and J. D. Road. "High-frequency oscillation and centroid frequency of diaphragm EMG during inspiratory loading." Respiration Physiology 112, no. 3 (June 1998): 305–13. http://dx.doi.org/10.1016/s0034-5687(98)00032-2.

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5

LaMothe, Jeremy M., and Ronald F. Zernicke. "Rest insertion combined with high-frequency loading enhances osteogenesis." Journal of Applied Physiology 96, no. 5 (May 2004): 1788–93. http://dx.doi.org/10.1152/japplphysiol.01145.2003.

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Mechanical loading can significantly affect skeletal adaptation. High-frequency loading can be a potent osteogenic stimulus. Additionally, insertion of rest periods between consecutive loading bouts can be a potent osteogenic stimulus. Thus we investigated whether the insertion of rest-periods between short-term high-frequency loading bouts would augment adaptation in the mature murine skeleton. Right tibiae of skeletally mature (16 wk) female C57BL/6 mice were loaded in cantilever bending at peak of 800 μϵ, 30 Hz, 5 days/wk for 3 wk. Left tibiae were the contralateral control condition. Mice were randomly assigned into one of two groups: continuous high-frequency (CT) stimulation for 100 s ( n = 9), or 1-s pulses of high-frequency stimuli followed by 10 s of rest (RI) for 100 s ( n = 9). Calcein labels were administered on days 1 and 21; label incorporation was used to histomorphometrically assess periosteal and endosteal indexes of adaptation. Periosteal surface referent bone formation rate (pBFR/BS) was significantly enhanced in CT (>88%) and RI (>126%) loaded tibiae, relative to control tibiae. Furthermore, RI tibiae had significantly greater pBFR/BS, relative to CT tibiae (>72%). The endosteal surface was not as sensitive to mechanical loading as the periosteal surface. Thus short-term high-frequency loading significantly elevated pBFR/BS, relative to control tibiae. Furthermore, despite the 10-fold reduction in cycle number, the insertion of rest periods between bouts of high-frequency stimuli significantly augmented pBFR/BS, relative to tibiae loaded continually. Optimization of osteogenesis in response to mechanical loading may underpin the development of nonpharmacological regiments designed to increase bone strength in individuals with compromised bone structures.

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6

Hu, Yuanpei, Chengqi Sun, Jijia Xie, and Youshi Hong. "Effects of Loading Frequency and Loading Type on High-Cycle and Very-High-Cycle Fatigue of a High-Strength Steel." Materials 11, no. 8 (August 16, 2018): 1456. http://dx.doi.org/10.3390/ma11081456.

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High-cycle and very-high-cycle fatigue tests via rotary bending (52.5 Hz), electromagnetic resonance (120 Hz) axial cycling, and ultrasonic (20 kHz) axial cycling were performed for a high-strength steel with three heat treatment conditions, and the effects of loading frequency and loading type on fatigue strength and fatigue life were investigated. The results revealed that the loading frequency effect is caused by the combined response of strain rate increase and induced temperature rise. A parameter η was proposed to judge the occurrence of loading frequency effect, and the calculated results were in agreement with the experimental data. In addition, a statistical method based on the control volume was used to reconcile the effect of loading type, and the predicted data were consistent with the experimental results.

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7

Vaško, A., L. Hurtalová, M. Uhríčik, and E. Tillová. "Fatigue of nodular cast iron at high frequency loading." Materialwissenschaft und Werkstofftechnik 47, no. 5-6 (May 17, 2016): 436–43. http://dx.doi.org/10.1002/mawe.201600519.

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8

Lyashenko, B. A., and E. B. Soroka. "Special features of high-frequency loading of coated materials." Strength of Materials 30, no. 5 (September 1998): 556–59. http://dx.doi.org/10.1007/bf02522640.

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9

Drobot, Yu B., A. M. Lazarev, and L. Yu Odnopozov. "Acoustic emission during high-frequency loading of structural materials." Strength of Materials 19, no. 6 (June 1987): 837–40. http://dx.doi.org/10.1007/bf01522844.

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10

Adekanmbi, Isaiah, Sarah Franklin, and Mark S. Thompson. "A novel in vitro loading system for high frequency loading of cultured tendon fascicles." Medical Engineering & Physics 35, no. 2 (February 2013): 205–10. http://dx.doi.org/10.1016/j.medengphy.2012.08.015.

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11

He, Chao, Yong Jie Liu, and Qing Yuan Wang. "Very High Cycle Fatigue Properties of Welded Joints under High Frequency Loading." Advanced Materials Research 647 (January 2013): 817–21. http://dx.doi.org/10.4028/www.scientific.net/amr.647.817.

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Very high cycle fatigue (VHCF) properties of welded joints under ultrasonic fatigue loading have been investigated for titanium alloy (TI-6Al-4V) and bridge steel (Q345). Ultrasonic fatigue tests of base metal and welded joints were carried out in ambient air at room temperature at a stress ratio R=-1. It was observed that the fatigue strength of welded joints reduced by 50-60% as compared to the base metal. The S-N fatigue curves in the range of 107~109 cycles of base metal and welded joints for both materials exhibited the characteristic of continually decreasing type. The fatigue failure still occurred after 107 cycles of loading, and the fatigue limit in traditional does not exist. The fatigue facture mainly located in the weld metal region at low cycle fatigue range, but in the fusion area in HCF and VHCF. Analysis of fracture surfaces analyzed by SEM revealed that the fatigue cracks initiated from welding defects such as pores, cracks and inclusions.

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12

Sonko, El hadji Mamadou, Mbaye Mbéguéré, Cheikh Diop, Seydou Niang, and Linda Strande. "Effect of hydraulic loading frequency on performance of planted drying beds for the treatment of faecal sludge." Journal of Water, Sanitation and Hygiene for Development 4, no. 4 (August 25, 2014): 633–41. http://dx.doi.org/10.2166/washdev.2014.024.

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This study was conducted to evaluate the effect of loading frequency on treatment performance of faecal sludge (FS) with drying beds planted with Echinochloa pyramidalis. Beds were loaded at a constant total solids (TS) loading rate of 200 kg TS/m2*year, at a frequency of 1X, 2X or 3X per week. The FS was highly variable, with a range of 2,600–21,492 mg/L TS, which resulted in variable hydraulic loadings. Weekly monitoring was conducted 23 times over a period of nine months. Increased loading frequency resulted in increased plant growth with 211, 265 and 268 plants/m2, respectively, for the 1X, 2X and 3X, and the 2X and 3X loadings had 12–13% more liquid lost due to evapotranspiration versus percolation. Even with high removals that were resistant to variable hydraulic loadings, leachate had 883–5,228 mg/L TS, 49–727 mg/L total suspended solids and 92–1,853 mg/L chemical oxygen demand due to the high initial concentrations. Increased loading frequency resulted in greater nitrification, with 7–28, 18–43 and 28–51 mg/L NO3− for 1X, 2X and 3X, respectively. FS requires a longer storage time than three months for stabilization and pathogen reduction. These results provide valuable information for FS planted drying bed operation.

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13

Zhang, Xiaolei, Antonia Torcasio, Katleen Vandamme, Toru Ogawa, G. Harry van Lenthe, Ignace Naert, and Joke Duyck. "Enhancement of Implant Osseointegration by High-Frequency Low-Magnitude Loading." PLoS ONE 7, no. 7 (July 10, 2012): e40488. http://dx.doi.org/10.1371/journal.pone.0040488.

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14

Shevchenko, V. B., T. A. Molodkina, and Yu F. Lugovskoi. "Durability and dislocation structure of nickel at high loading frequency." Strength of Materials 22, no. 1 (January 1990): 29–33. http://dx.doi.org/10.1007/bf00774976.

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15

Černý, Michal, Josef Filípek, and Pavel Mazal. "Dynamic loading of galvanized parts." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 58, no. 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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16

Alikhani, M., E. Khoo, B. Alyami, M. Raptis, J. M. Salgueiro, S. M. Oliveira, A. Boskey, and C. C. Teixeira. "Osteogenic Effect of High-frequency Acceleration on Alveolar Bone." Journal of Dental Research 91, no. 4 (February 14, 2012): 413–19. http://dx.doi.org/10.1177/0022034512438590.

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Mechanical stimulation contributes to the health of alveolar bone, but no therapy using the osteogenic effects of these stimuli to increase alveolar bone formation has been developed. We propose that the application of high-frequency acceleration to teeth in the absence of significant loading is osteogenic. Sprague-Dawley rats were divided among control, sham, and experimental groups. The experimental group underwent localized accelerations at different frequencies for 5 min/day on the occlusal surface of the maxillary right first molar at a very low magnitude of loading (4 µε). Sham rats received a similar load in the absence of acceleration or frequency. The alveolar bone of the maxilla was evaluated by microcomputed tomography (µCT), histology, fluorescence microscopy, scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR imaging), and RT-PCR for osteogenic genes. Results demonstrate that application of high-frequency acceleration significantly increased alveolar bone formation. These effects were not restricted to the area of application, and loading could be replaced by frequency and acceleration. These studies propose a simple mechanical therapy that may play a significant role in alveolar bone formation and maintenance.

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17

Cao, Phu Cuong, Zhong Yin Guo, Yong Shun Yang, and Zhi Chao Xue. "Analysis of Effects of High Temperature and Loading Frequency on Asphalt Binder." Applied Mechanics and Materials 372 (August 2013): 314–17. http://dx.doi.org/10.4028/www.scientific.net/amm.372.314.

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Based on the theory of viscoelasticity, the Dynamic Shear Rheology test is used as study method. Study subjects are AH70 asphalt, SBS modified asphalt and MAC modified asphalt. Study objective is to analyze the effects of both high temperature and loading frequency on asphalt binder in asphalt mixture. Results from studies have revealed that: At high temperature and low loading frequency, the elasticity of asphalt binder decreases or low possibility of strain recovery, rutting resistance parameter decreases or the risk of rutting increases; At high temperature and high loading frequency, the viscosity of asphalt binder decreases or the strain speed of asphalt binder increases; At low temperature and high loading frequency, the fatigue resistance parameter increases, in other words there exists high fatigue cracking potential.

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18

Zhang, Li, Brian J. Gavigan, and Joseph L. Rose. "High Frequency Guided Wave Natural Focusing Pipe Inspection With Frequency and Angle Tuning." Journal of Pressure Vessel Technology 128, no. 3 (April 20, 2005): 433–38. http://dx.doi.org/10.1115/1.2218348.

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When ultrasonic guided wave nondestructive evaluation is used to inspect pipelines, partial loading of transducers around the circumference leads to a non-axisymmetric energy distribution. At particular axial distances and frequencies, the ultrasonic energy is naturally focused at some spots via constructive wave interference. This so-called “natural focusing” phenomenon can be used to improve guided wave sensitivity for a defect by impinging more energy onto it. However, defects located in other places can be missed, unless we can move the natural focusing points throughout the pipe. We have done this by frequency and circumferential angle tuning for specific circumferential loading lengths. In order to utilize the natural focusing phenomenon to enhance detection sensitivity, a frequency and angle tuning (FAT) technique is employed to extend the area that can be scanned by focal energy. It is observed that the natural focal points at a fixed axial distance move with frequency variation and circumferential excitation length change. In this paper, the natural focusing phenomenon with FAT is theoretically calculated and experimentally investigated. The results show that the natural focusing inspection technique can sufficiently inspect an entire pipe with FAT.

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19

Gerspacher, M., C. P. O'Farrell, L. Nikiel, H. H. Yang, and F. Le Méhauté. "High Frequency Viscoelasticity of Carbon Black Filled Compounds." Rubber Chemistry and Technology 69, no. 5 (November 1, 1996): 786–800. http://dx.doi.org/10.5254/1.3538402.

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Abstract A high frequency viscoelasticity spectrometer, using the state-of-the-art ultrasonic technology, was constructed. The longitudinal and shear waves characteristics were measured in rubber compounds to obtain the attenuation coefficient, α, and sound velocity, v Preliminary results were obtained for a number of filled and unfilled polymers. The grade of carbon black used, filler loading, crosslinking density and filler dispersion were varied during the study. Temperature sweepS from −100°C to +60°C were also studied. It was found that the polymer type had a greater influence on α and v than did the grade of carbon black, loading or dispersion. The experimental data show that shear waves do not propagate in the rubbery state. Above the glass transition temperature, Tg, the longitudinal wave measurements could be sufficient to determine the high frequency dynamic properties of filled and unfilled polymers to characterize a tire tread compound. The temperature sweep measurements allowed the determination of the Tg of polymers at high frequency. It is proposed that the described method of measuring α and v be used as a laboratory tool for potential tire traction prediction.

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20

Meng, H. J., Y. Wang, B. Zhang, and S. H. Gao. "Investigation on the Effect of Dynamic Frequency on Fracture Evolution in Preflawed Rock under Multistage Cyclic Loads: Insight from Acoustic Emission Monitoring." Geofluids 2020 (October 29, 2020): 1–15. http://dx.doi.org/10.1155/2020/8891395.

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This study is aimed at revealing the effect of dynamic loading frequency on the fracture evolution behavior in preflawed rock samples under multistage cyclic loading conditions. The fracture evolution characteristics were investigated using stress-strain descriptions and in situ acoustic emission techniques. It is shown that rock strength, deformation, AE pattern, and fatigue life are strongly affected by the applied dynamic loading frequency. Rock fatigue strength and lifetime increase with the increase of dynamic loading frequency. The AE count and energy output both increase with the increase of the applied loading frequency. Six kinds of cracking modes were revealed by AE spectral frequency analysis. It is shown that large-scaled cracks are easy to be formed for rock subjected to high-frequency loads, reflected as the deceasing of AE signals with high-frequency–high-amplitude signal feature. It is suggested that applied dynamic loading frequency has obvious impact on the crack coalescence at the rock bridge segment. The testing results are helpful to enhance the cognitive of the influence of dynamic frequency on the crack communication behavior and can be expected to predict the stability of rock mass structures where rock mass is subjected to fatigue loading.

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21

Yan, Nu, Qing Yuan Wang, Q. Chen, and J. J. Sun. "Influence of Loading Frequency on Fatigue Behavior of High Strength Steel." Key Engineering Materials 353-358 (September 2007): 227–30. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.227.

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In order to investigate the influence of loading frequency on the fatigue behaviors of the high strength steel, ultrasonic fatigue tests were carried out for a high-carbon-chromium steel and the results were compared with those of fatigue tests using conventional rotary bending fatigue test machine with a frequency of 52.5Hz. The different of fatigue strength at ultrasonic frequency level and conventional frequency level is very small and the S-N curve obtained from 20 kHz or 52.5 Hz shows the step-wise shape. The fatigue crack occurred from inclusions on the subsurface site in the long life regime and the typical surface fracture occurred in the short life one though the loading frequency level is different. It is indicated that ultrasonic fatigue method is an effective method to investigate the fatigue properties in super-long life region.

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22

Zatloukalova, Jana, and Kay Raum. "High frequency ultrasound assesses transient changes in cartilage under osmotic loading." Mathematical Biosciences and Engineering 17, no. 5 (2020): 5190–211. http://dx.doi.org/10.3934/mbe.2020281.

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23

Teranishi, Takashi, Tsuyoshi Sogabe, Hidetaka Hayashi, Akira Kishimoto, Kengo Iokibe, and Yoshitaka Toyota. "Effect of Mg loading on the high-frequency tunability of Ba0.8Sr0.2TiO3ceramics." Japanese Journal of Applied Physics 54, no. 1 (December 16, 2014): 011502. http://dx.doi.org/10.7567/jjap.54.011502.

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24

Kultural, S. E., and I. B. Eryurek. "Fatigue behavior of calcium carbonate filled polypropylene under high frequency loading." Materials & Design 28, no. 3 (January 2007): 816–23. http://dx.doi.org/10.1016/j.matdes.2005.11.009.

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25

Naoe, Takashi, Zhihong Xiong, and Masatoshi Futakawa. "Temperature measurement for in-situ crack monitoring under high-frequency loading." Journal of Nuclear Materials 506 (August 2018): 12–18. http://dx.doi.org/10.1016/j.jnucmat.2017.12.019.

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26

Torcasio, Antonia, Katharina Jähn, Maarten Van Guyse, Pieter Spaepen, Andrea E. Tami, Jos Vander Sloten, Martin J. Stoddart, and G. Harry van Lenthe. "Trabecular Bone Adaptation to Low-Magnitude High-Frequency Loading in Microgravity." PLoS ONE 9, no. 5 (May 2, 2014): e93527. http://dx.doi.org/10.1371/journal.pone.0093527.

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27

Wang, Q. Y., N. Kawagoishi, and Q. Chen. "Fatigue voids in structural Al-alloys under high-frequency cyclic loading." Journal of Materials Science 39, no. 1 (January 2004): 365–67. http://dx.doi.org/10.1023/b:jmsc.0000008091.55395.ee.

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28

Paul Boy, Jean, and Florent Lyard. "High-frequency non-tidal ocean loading effects on surface gravity measurements." Geophysical Journal International 175, no. 1 (October 2008): 35–45. http://dx.doi.org/10.1111/j.1365-246x.2008.03895.x.

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29

Chatterjee, M., K. Hatori, J. Duyck, K. Sasaki, I. Naert, and K. Vandamme. "High-frequency loading positively impacts titanium implant osseointegration in impaired bone." Osteoporosis International 26, no. 1 (August 28, 2014): 281–90. http://dx.doi.org/10.1007/s00198-014-2824-0.

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30

Qian, Zhixiong, Shigeo Takezono, and Katsumi Tao. "Effect of loading frequency on fatigue crack growth under high temperature." International Journal of Solids and Structures 33, no. 24 (October 1996): 3601–10. http://dx.doi.org/10.1016/0020-7683(95)00201-4.

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31

Xu, Wei, Yanguang Zhao, Xin Chen, Bin Zhong, Huichen Yu, Yuhuai He, and Chunhu Tao. "An Ultra-High Frequency Vibration-Based Fatigue Test and Its Comparative Study of a Titanium Alloy in the VHCF Regime." Metals 10, no. 11 (October 24, 2020): 1415. http://dx.doi.org/10.3390/met10111415.

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This paper proposes an ultra-high frequency (UHF) fatigue test of a titanium alloy TA11 based on electrodynamic shaker in order to develop a feasible testing method in the VHCF regime. Firstly, a type of UHF fatigue specimen is designed to make its actual testing frequency reach as high as 1756 Hz. Then the influences of the loading frequency and loading types on the testing results are considered separately, and a series of comparative fatigue tests are hence conducted. The results show the testing data from the present UHF fatigue specimen agree well with those from the conventional vibration fatigue specimen with the loading frequency of 240 Hz. Furthermore, the present UHF testing data show good consistency with those from the axial-loading fatigue and rotating bending fatigue tests. But the obtained fatigue life from ultrasonic fatigue test with the loading frequency of 20 kHz is significantly higher than all other fatigue test results. Thus the proposed ultra-high frequency vibration-based fatigue test shows a balance of high efficiency and similarity with the conventional testing results.

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32

Gadenin, M. M. "Study of the effect of strain amplitude ratio at two-frequency cyclic loading." Industrial laboratory. Diagnostics of materials 84, no. 12 (December 20, 2018): 50–60. http://dx.doi.org/10.26896/1028-6861-2018-84-12-50-60.

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The operating modes of loading elements of machines and structures exhibit, as a rule, more complicated character of their loading cycles compared to sinusoidal used in the practice of calculations and experiments. It is noted that in a number of cases the actual conditions of load changing can be schematized by dual-frequency loading modes with superposition of the high-frequency component of the main workload attributed to the effects of vibrations, aero- and hydrodynamic impacts, regulation of the working process, etc. Testing of three steel samples which differ in their cyclic properties has shown that such two-frequency regimes lead to a decrease in the durability in comparison with single-frequency loading, equal in the amplitude of maximum stresses. This reduction depends on the parameters of the basic low-frequency and imposed high-frequency loads. Evaluation of this reduction can be performed both i) using the laws of summation of the damage expressed in the strain terms, and ii) using an analytical expression considered below, which includes calculated or experimentally determined durability for single-frequency loading with the maximum (total) amplitude of the effective stress and durability coefficient, characteristic of each type of material and determined by the ratio of amplitudes and hours of low- and high stresses. A computational-experimental analysis of the effect of the amplitude of low-frequency and superimposed high-frequency loading under two-frequency modes of stress change on the cyclic durability showed that the imposition of the high-frequency component of cyclic deformation on the main low-cycle loading process leads to a significant decrease in the cyclic durability, the level of the decrease correlates with the level of amplitudes and frequencies ratios of the summarized harmonic processes of load application.

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33

Wong, E. H., S. K. W. Seah, and V. P. W. Shim. "Frequency-Dependent Low Cycle Fatigue of Sn1Ag0.1Cu(In/Ni) Solder Joints Subjected to High-Frequency Loading." Journal of Electronic Materials 43, no. 2 (November 23, 2013): 586–93. http://dx.doi.org/10.1007/s11664-013-2889-0.

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34

M., KUFFOVA. "FATIGUE RESISTANCE OF MAGNESIUM ALLOY AZ 91D AT HIGH-FREQUENCY CYCLE LOADING." International Conference on Applied Mechanics and Mechanical Engineering 12, no. 12 (May 1, 2006): 15–21. http://dx.doi.org/10.21608/amme.2006.41694.

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35

Torcasio, Antonia, Katharina Jähn, Maarten Van Guyse, Pieter Spaepen, Andrea E. Tami, Jos Vander Sloten, David B. Jones, Martin J. Stoddart, and G. Harry van Lenthe. "TRABECULAR BONE ADAPTATION TO LOW-MAGNITUDE HIGH-FREQUENCY LOADING AT MICRO-GRAVITY." Journal of Biomechanics 45 (July 2012): S531. http://dx.doi.org/10.1016/s0021-9290(12)70532-8.

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36

Sun, Qi Deng, Buddhima Indraratna, and Sanjay Nimbalkar. "Deformation and Degradation Mechanisms of Railway Ballast under High Frequency Cyclic Loading." Journal of Geotechnical and Geoenvironmental Engineering 142, no. 1 (January 2016): 04015056. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0001375.

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37

Kong, Xin-Bing, and Cheng Liu. "Testing against constant factor loading matrix with large panel high-frequency data." Journal of Econometrics 204, no. 2 (June 2018): 301–19. http://dx.doi.org/10.1016/j.jeconom.2018.03.001.

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38

Evropin, S. V., and V. M. Filatov. "Service-life analysis of nuclear reactor elements under high-frequency random loading." Atomic Energy 113, no. 4 (February 2013): 258–64. http://dx.doi.org/10.1007/s10512-013-9627-9.

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39

Fintová, Stanislava, Pavel Pokorný, Rostislav Fajkoš, and Pavel Hutař. "EA4T railway axle steel fatigue behavior under very high-frequency fatigue loading." Engineering Failure Analysis 115 (September 2020): 104668. http://dx.doi.org/10.1016/j.engfailanal.2020.104668.

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40

Han, Guebum, Utku Boz, Melih Eriten, and Corinne R. Henak. "Glycosaminoglycan depletion increases energy dissipation in articular cartilage under high-frequency loading." Journal of the Mechanical Behavior of Biomedical Materials 110 (October 2020): 103876. http://dx.doi.org/10.1016/j.jmbbm.2020.103876.

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41

Zhang, Xiaolei, Katleen Vandamme, Antonia Torcasio, Toru Ogawa, G. Harry van Lenthe, Ignace Naert, and Joke Duyck. "In vivo assessment of the effect of controlled high- and low-frequency mechanical loading on peri-implant bone healing." Journal of The Royal Society Interface 9, no. 72 (January 25, 2012): 1697–704. http://dx.doi.org/10.1098/rsif.2011.0820.

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The aim of this study was to investigate the effect of controlled high- (HF) and low-frequency (LF) mechanical loading on peri-implant bone healing. Custom-made titanium implants were inserted in both tibiae of 69 adult Wistar rats. For every animal, one implant was loaded by compression through the axis of tibia (test), whereas the other one was unloaded (control). The test implants were randomly distributed among four groups receiving different loading regimes, which were determined by ex vivo calibration. Within the HF (40 Hz) or LF (2 Hz) loading category, the magnitudes were chosen as low- (LM) and high-magnitude (HM), respectively, leading to constant strain rate amplitudes for the two frequency groups. This resulted in the four loading regimes: (i) HF-LM (40 Hz–0.5 N); (ii) HF-HM (40 Hz–1 N); (iii) LF-LM (2 Hz–10 N); and (iv) LF-HM (2 Hz–20 N) loading. Loading was performed five times per week and lasted for one or four weeks. Tissue samples were processed for histology and histomorphometry (bone-to-implant contact, BIC; and peri-implant bone fraction, BF) at the cortical and medullar level. Data were analysed statistically with ANOVA and paired t -tests with the significance level set at 0.05. For the one-week experiments, an increased BF adjacent to the implant surface at the cortical level was exclusively induced by the LF-HM loading regime (2 Hz–20 N). Four weeks of loading resulted in a significant effect on BIC (and not on BF) in case of HF-LM loading (40 Hz–0.5 N) and LF-HM loading (2 Hz–20 N): BIC at the cortical level significantly increased under both loading regimes, whereas BIC at the medullar level was positively influenced only in case of HF-LM loading. Mechanical loading at both HF and LF affects osseointegration and peri-implant BF. Higher loading magnitudes (and accompanying elevated tissue strains) are required under LF loading to provoke a positive peri-implant bone response, compared with HF loading. A sustained period of loading at HF is needed to result in an overall enhanced osseointegration.

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Gan, Xuehui, Jianhua Yan, Bohong Gu, and Baozhong Sun. "Impact tensile behavior and frequency response of 3D braided composites." Textile Research Journal 82, no. 3 (November 8, 2011): 280–87. http://dx.doi.org/10.1177/0040517511427970.

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The uniaxial tensile properties of 4-step 3D braided E-glass/epoxy composites under quasi-static and high-strain rate loadings have been investigated to evaluate the tensile failure mode at different strain rates. The uniaxial tensile properties at high strain rates from 800/s to 2100/s were tested using the split Hopkinson tension bar (SHTB) technique. The tensile properties at quasi-static strain rate were also tested and compared with those in high strain rates. Z-transform theory is applied to 3D braided composites to characterize the system dynamic behaviors in frequency domain. The frequency responses and the stability of 3D braided composites under quasi-static and high-strain rate compression have been analyzed and discussed in the Z-transform domain. The results indicate that the stress-strain curves are rate sensitive, and tensile modulus, maximum tensile stress and corresponding tensile strain are also sensitive to the strain rate. The tensile modulus, maximum tensile stress of the 3D braided composites are linearly increased with the strain rate. With increasing of the strain rate (from 0.001/s to 2100/s), the tensile failure of the 3D braided composite specimens has a tendency of transition from ductile failure to brittle failure. The magnitude response and phase response is very different in quasi-static loading with that in high-strain rate loading. The 3D braided composite system is more stable at high strain rate than quasi-static loading.

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Summers, Jeffery J., Winston D. Byblow, Don F. Bysouth-Young, and Andras Semjen. "Bimanual Circle Drawing during Secondary Task Loading." Motor Control 2, no. 2 (April 1998): 106–13. http://dx.doi.org/10.1123/mcj.2.2.106.

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Seven right-handed participants performed bimanual circling movements in either a symmetrical or an asymmetrical coordination mode. Movements were paced with an auditory metronome at predetermined frequencies corresponding to transition frequency, where asymmetrical patterns became unstable, or at two-thirds transition frequency, where both symmetrical and asymmetrical patterns were stable. The pacing tones were presented in either a high (1000 Hz) or low (500 Hz) pitch, and the percentage of high-pitched tones during a 20 s trial varied between 0% and 70%. Participants were instructed to count the number of high-pitched pacing tones that occurred during a trial of bimanual circling. Overall, the symmetrical pattern was more stable than the asymmetrical pattern at both frequencies. Errors on the tone-counting task were significantly higher during asymmetrical circling than symmetrical circling but only at the transition movement frequency. The results suggest that cognitive processes play a role in maintaining coordination patterns within regions of instability.

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SHUI, L., T. JIN, X. F. SUN, and Z. Q. HU. "HIGH-CYCLE FATIGUE BEHAVIOR OF AM3 NICKEL-BASE SINGLE CRYSTAL SUPERALLOY AT HIGH TEMPERATURE." International Journal of Modern Physics B 24, no. 15n16 (June 30, 2010): 2886–91. http://dx.doi.org/10.1142/s0217979210065805.

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A single crystal nickel-base superalloy with ‹001› orientation was subjected to high cycle fatigue loading at temperature of 700°C and 870°C. The tests were performed in ambient atmosphere under load control at a stress ratio R =σ min /σ max =0.1 and a frequency of 83.3 Hz on smooth specimens. In this paper, the premature initiation and rapid propagation of cracks to failure due to high frequency cyclic loading were explored. The dislocation characteristics and fracture surface observation were evaluated through scanning electron microscopy and transmission electron microscopy, respectively. The results showed that the fatigue strength at 700°C was higher than that at 870°C. At 700°C the interaction of cyclic stress with high temperature induced the precipitation of homogeneous hyperfine secondary γ′ particles, that is beneficial to fatigue strength. At 870°C, the cyclic stress led to the formation of persistent slip bands moving through the γ matrix channels and the γ′ precipitates. The morphology change of γ′ phase was not notable during the deformation at high frequency cyclic loading.

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MATSUO, Akitoshi, Noboru EGAMI, Hirohisa KIMACHI, and Junpei WAKAO. "422 Evaluation of Fatigue Strength by Ultrasonic Fatigue Testing : Application to Fatigue Strength under Low Frequency Loading, and Fatigue Properties under High Frequency Loading." Proceedings of Conference of Tokai Branch 2005.54 (2005): 125–26. http://dx.doi.org/10.1299/jsmetokai.2005.54.125.

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Muangma, Rakdiaw, and Kanitta Supawan. "Hysteresis Effect of Sensor Materials for Measuring of Brinell Hardness Truncated Using High-Frequency of Cyclic Measurement." Applied Mechanics and Materials 901 (August 2020): 57–63. http://dx.doi.org/10.4028/www.scientific.net/amm.901.57.

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This presentation focuses on the high-frequency of cyclic measurement that can be used for minimizing the effect of mechanical hysteresis. By this experiment, the investigating conditions include the periods of cyclic loading were varied as following: 1500, 1250, 1000, and 500 counts per period and the time interval between the periods of cyclic loading was fixed at 1 hour. After modifying procedures, it was found that the linearity of characteristic curve with condition of 500 counts per period demonstrated more clearly than random one. Finally, the linking between the Active Weight Loading (AWL) and the Weight Loading (WL) elucidated using the characteristic curves, while, the cyclic measuring of AWL exhibited in the ranging: 7.0 to 110.0 N which were exhibited using the Graphical User Interface (GUI), respectively.

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Vasko, Alan, and Juraj Belan. "Fatigue tests of nodular cast iron at low and high frequency cyclic loading." Materials Today: Proceedings 4, no. 5 (2017): 5985–88. http://dx.doi.org/10.1016/j.matpr.2017.06.082.

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Vijayakumar, K., Apurbba Kr Sharma, M. M. Mayuram, and R. Krishnamurthy. "Response of plasma-sprayed alumina–titania ceramic composite to high-frequency impact loading." Materials Letters 54, no. 5-6 (June 2002): 403–13. http://dx.doi.org/10.1016/s0167-577x(01)00601-2.

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Vijayakumar, K., Apurbba Kr Sharma, M. M. Mayuram, and R. Krishnamurthy. "Response of plasma sprayed alumina–titania ceramic composite to high frequency impact loading." Materials Letters 56, no. 3 (October 2002): 252–62. http://dx.doi.org/10.1016/s0167-577x(02)00452-4.

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Gridasova, Ekaterina A., Pavel Nikiforov, and Alexey Loktev. "The Influence of High-Frequency Cyclic Loading on the Mechanical Properties of Steel." Materials Science Forum 945 (February 2019): 549–55. http://dx.doi.org/10.4028/www.scientific.net/msf.945.549.

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The modern development of high-speed transport causes a requirement toughening of the safety requirements for rolling stock and upper track components. Researchers and constructors are actively working towards the creation of more complete and adequate models of constructers and their elements, as well as new materials for their manufacture. The problem of studying traditional materials in various modes of rolling stock operation, including increasing the frequencies of dynamic influences and imposing effects from various loads and oscillations to the high-frequency area, becomes relevant and timely. This work is devoted to modeling the influence of high-frequency loading on a sample made of rail steel, this kind of influence takes place when rolling stock passes through an artificial constructer. It is assumed that the work of the rail within the sleepers step is described by the laws of uniaxial tension-compression. Experimental results and conclusions on ultrasonic high-frequency cyclic tests and structural analysis of the model material - low-carbon steel of the perlite class are presented.

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