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Relevant bibliographies by topics / High-frequency loading

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Academic literature on the topic 'High-frequency loading'

Author: Grafiati

Published: 28 June 2021

Last updated: 8 February 2022

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Journal articles on the topic "High-frequency loading"

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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "High-frequency loading"

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Coyles, Virginia. "High frequency components of lower leg loading during locomotor activities." Thesis, Liverpool John Moores University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247716.

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MYERS, MATTHEW RONALD. "EFFECT OF AIRFOIL MEAN LOADING ON HIGH-FREQUENCY GUST INTERACTION NOISE (AEROACOUSTICS, FAN, TURBOMACHINERY)." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184032.

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This dissertation investigates the effect of airfoil steady loading on the sound generated by the interaction of an isolated, zero-thickness airfoil with a high-frequency convected disturbance. The analysis is based on a linearization of the inviscid equations of motion about a nonuniform mean flow. The mean flow is assumed to be two-dimensional and subsonic. Throughout most of the dissertation, we assume that the Mach number is 0(1), though in one section we concentrate on the leading-edge region and study the behavior of the sound field as the Mach number tends to zero. The small parameter representing the amount of airfoil camber and incidence angle, and the large parameter representing the ratio of airfoil chord to disturbance wavelength, are utilized in a singular perturbation analysis. The analysis shows that essentially all of the sound is generated at the leading and trailing edges, in regions the size of the disturbance wavelength. The solution in the local-leading-edge region reveals several sound-generating mechanisms which do not exist for an airfoil with no mean loading. These mechanisms are not present at the trailing edge; the trailing edge is important only as a scatterer of the sound produced at the leading edge. The propagation of sound away from the airfoil edges is described by geometric acoustics, with the amplitude varying on the scale of the airfoil chord and the phase varying on the much smaller scale of the disturbance wavelength. In addition, a diffraction-type transition region exists downstream of the airfoil. Calculations of radiated acoustic power show that the sound field depends strongly on Mach number, gust characteristics, and airfoil steady loading. Small changes in these properties can produce large changes in radiated power levels. Most importantly, we find that the amount of power radiated correlates very well with the strength of the mean flow around the leading edge.

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Boroch, Robert Edward. "Mechanical Properties and Fatigue of Polycrystalline Silicon under Static and High Frequency Cyclic Loading." [S.l. : s.n.], 2008. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000009793.

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Horwich, Elizabeth Ann. "Unsteady response of a two-dimensional hydrofoil subject to high reduced frequency gust loading." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12408.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
Includes bibliographical references (leaves 111-112).
by Elizabeth Ann Horwich.
M.S.

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Melcher, Anthony A. "Estimating Suspended Solids and Phosphorus Loading in Urban Stormwater Systems Using High-Frequency, Continuous Data." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7455.

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The introduction of pavement, buildings, and other impervious surfaces to urban landscapes greatly influences the quantity and quality of urban stormwater runoff. In this study, we designed and implemented modern stormwater monitoring technologies to establish a “smart” stormwater sensor network within the Northwest Field Canal (NWFC), an urban water conveyance located in Logan, Utah, USA. This network was designed to collect flow and water quality data at high frequencies and simultaneously at multiple locations. The observatory’s innovative method of inter-site communication and changing sampling frequencies during storm events was able to capture short duration events at the upstream and downstream ends of the NWFC and at multiple outfalls in the canal simultaneously without human intervention. We then investigated statistical regression models between turbidity and TSS so as to predict TSS at high frequencies. Finally, the addition of the high-frequency discharge data in the calibration procedure for a stormwater simulation model developed using the Environmental Protection Agency’s Stormwater Management Model did little to improve model performance at the downstream end of the canal, but did provide important insight into the overall contribution of discharge from individual stormwater outfalls to the NWFC. The results of this study inform water professionals on how to build and operate automated monitoring systems and how to create high-frequency estimates of TSS and TP loads in urban water systems.

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Delpero, Philip Mario. "Investigation of flows around a two dimensional hydrofoil subject to a high reduced frequency gust loading." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13132.

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Boroch, Robert Edward [Verfasser], and P. [Akademischer Betreuer] Gumbsch. "Mechanical Properties and Fatigue of Polycrystalline Silicon under Static and High Frequency Cyclic Loading / Robert Edward Boroch ; Betreuer: P. Gumbsch." Karlsruhe : KIT-Bibliothek, 2008. http://d-nb.info/1197695494/34.

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Adekanmbi, Isaiah. "Investigating tendon mechanobiology and the potential of high frequency low magnitude loads for tendon repair and remodelling using a novel in vitro loading system." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:73ae9cec-3cea-4204-894f-382a68623c41.

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Tendon injuries are ubiquitous in the sporting and occupational environment. Clinically they present a challenge to Orthopaedic surgeons as they account for up to half of all sports injuries and almost half of reported work related ailments. The capacity for tendons to heal subsequent to injury is restricted due to their poor blood supply. Moreover, healed tendon tissue may be inferior to the intact tendon, having diminished biochemical and biomechanical properties and this brings about an ever increasing need for optimized treatment methods for tendon repair. Mechanobiology is concerned with how mechanical forces influence physiological and pathological aspects of the living tissue. However, the complex and poorly controlled loading environment in living organisms prevent the establishment of direct relationships between mechanical stimuli and tissue response. By developing a novel in vitro loading system (IVLS), the work in this thesis investigates the potential of a new and exciting biophysical loading intervention, High Frequency Low Magnitude (HFLM) mechanical loading, for stimulation of tendon repair and remodelling. Following a pre-defined stimulation period, healthy rat tail tendon fascicles (RTTFs) were evaluated for tissue viability and metabolism, Glycosaminoglycan (GAG) content, collagen arrangement and tangent modulus, using staining and biochemical assays, together with microscopy techniques, and mechanical testing. HFLM mechanically loaded tendons showed a trend for a higher tangent modulus than fresh tissue, and significantly higher modulus than unloaded. Further, when varying mechanical loading parameters of frequencies and dosages over clinically relevant ranges, a frequency dependent response was observed with increased tangent modulus and GAG content with increasing frequency. An association between high tendon crimp pattern and elevated tendon modulus as a result of HFLM mechanical loading was also demonstrated. Concomitantly, an injury model was developed to evaluate the effects of in vitro static, low frequency cyclic and HFLM mechanical loading conditions on the biochemical and biomechanical properties of in vitro damaged tendons. HFLM mechanically loaded damaged tendons again demonstrated significantly higher modulus and metabolism than unloaded tissue, although these were reduced below those of fresh damaged tissue. The findings in this thesis together with the newly developed IVLS reveal the potential for an exciting and unique biophysical therapeutic loading intervention for treatment of tendon injuries, and provide a scientific platform for further investigation of the effects of HFLM mechanical loads, potentially leading to an application within the clinic for enhanced connective tissue repair and remodelling.

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Kozáková, Kamila. "Vliv vrubů při cyklickém vysokofrekvenčním únavovém zatěžování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443717.

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The diploma thesis deals with the evaluation of the lifetimes of smooth and notched specimens. The comparison of their lifetimes is focused on the case of high-frequency cyclic loading in the area of high-cycle and gigacycle fatigue of materials. The theory of critical distances is used to evaluate and recalculate the life curves of the notched specimens. The effect of the notch is quantified using the Line method. The critical length parameter is determined so that the life curve of the notched specimens corresponds to the curve measured on smooth specimens. The result is the dependence of the critical length parameter on the number of cycles to fracture. Knowledge of critical length parameters can be used to determine the lifetime of notched specimens as well as real notched components using the results of fatigue tests of smooth specimens.

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Lin, Sheng-Da, and 林聖達. "High cycle fatigue life prediction and investigation of loading frequency effect of Si-based micro structures under bending cyclic loading." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u532b3.

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Books on the topic "High-frequency loading"

1

Kordgharachorloo, Faramarz. Fragmentation of Sudbury hard rock by high frequency cyclic loading. [s.l: s.n.], 1987.

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Reskusich, John. Cyclic strain amplitude and heat treatment effects on the high damping behavior of incramute alloy under random vibration loading in the 50-1000 HZ frequency range. 1986.

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Book chapters on the topic "High-frequency loading"

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Lorsch, P., M. Sinapius, and Peter Wierach. "Methodology for the high-frequency testing of fiber-reinforced plastics." In Fatigue of Materials at Very High Numbers of Loading Cycles, 487–509. Wiesbaden: Springer Fachmedien Wiesbaden, 2018. http://dx.doi.org/10.1007/978-3-658-24531-3_22.

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Lara, Paul A., Hugh A. Bruck, and Edda C. Müller. "Characterization of High Frequency Pulse Loading on Fatigue of Metals." In Fracture, Fatigue, Failure and Damage Evolution , Volume 3, 7–18. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60959-7_2.

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Gridasova, Ekaterina, Pavel Nikiforov, Alexey Loktev, Vadim Korolev, and Irina Shishkina. "Changes in the Structure of Rail Steel Under High-Frequency Loading." In VIII International Scientific Siberian Transport Forum, 559–69. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37916-2_54.

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Yan, Nu, Qing Yuan Wang, Q. Chen, and J. J. Sun. "Influence of Loading Frequency on Fatigue Behavior of High Strength Steel." In Key Engineering Materials, 227–30. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.227.

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Shibamoto, Aya, Toru Ogawa, Masayoshi Yokoyama, Joke Duyck, Katleen Vandamme, Ignace Naert, and Keiichi Sasaki. "Osteogenetic Effect of Low-Magnitude High-Frequency Loading and Parathyroid Hormone on Implant Interface in Osteoporosis." In Interface Oral Health Science 2016, 269–77. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1560-1_22.

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Lesne, P. M., and G. Gailletaud. "CREEP FATIGUE INTERACTION UNDER HIGH FREQUENCY LOADING." In Mechanical Behaviour of Materials V, 1053–61. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-08-034912-1.50142-9.

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Karamnejad, A., L. Sluys, and V. Nguyen. "Modeling concrete under high frequency loading using a multi-scale method." In Computational Modelling of Concrete Structures, 189–97. CRC Press, 2014. http://dx.doi.org/10.1201/b16645-21.

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"The thermo–mechanical behavior of a gas storage cavern during high frequency loading." In Mechanical Behaviour of Salt VII, 377–84. CRC Press, 2012. http://dx.doi.org/10.1201/b12041-51.

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Salajegheh, Eysa, and Ali Heidari. "Optimum Design of Structures for Earthquake Induced Loading by Wavelet Neural Network." In Intelligent Computational Paradigms in Earthquake Engineering, 80–100. IGI Global, 2007. http://dx.doi.org/10.4018/978-1-59904-099-8.ch005.

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Optimum design of structures for earthquake induced loading is achieved by a modified genetic algorithm (MGA). Some features of the simulated annealing (SA) are used to control various parameters of the genetic algorithm (GA). To reduce the computational work, a fast wavelet transform is used. The record is decomposed into two parts. One part contains the low frequency of the record, and the other contains the high frequency of the record. The low-frequency content is used for dynamic analysis. Then using a wavelet neural network, the dynamic responses of the structures are approximated. By such approximation, the dynamic analysis of the structure becomes unnecessary in the process of optimisation. The wavelet neural networks have been employed as a general approximation tool for the time history dynamic analysis. A number of structures are designed for optimal weight and the results are compared to those corresponding to the exact dynamic analysis.

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"Fatigue." In Damage Mechanisms and Life Assessment of High-Temperature Components, 111–82. ASM International, 1989. http://dx.doi.org/10.31399/asm.tb.dmlahtc.t60490111.

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Abstract This chapter describes the phenomenological aspects of fatigue and how to assess its effect on the life of components operating in high-temperature environments. It explains how fatigue is measured and expressed and how it is affected by loading conditions (stress cycles, amplitude, and frequency) and factors such as temperature, material defects, component geometry, and processing history. It provides a detailed overview of the damage mechanisms associated with high-cycle and low-cycle fatigue as well as thermal fatigue, creep-fatigue, and fatigue-crack growth. It also demonstrates the use of tools and techniques that have been developed to quantify fatigue-related damage and its effect on the remaining life of components.

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Conference papers on the topic "High-frequency loading"

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Braune, H., V. Erckmann, S. Illy, G. Michel, F. Noke, and F. Purps. "Collector loading during high frequency power modulation." In 2010 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010). IEEE, 2010. http://dx.doi.org/10.1109/icimw.2010.5613028.

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Qi, Zhengpan, Li Lu, Linh Doan, Bhavani Thota, Danielle Zeng, and Xuming Su. "Frequency Effects on High-Density Polyethylene Failure under Cyclic Loading." In WCX™ 17: SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2017. http://dx.doi.org/10.4271/2017-01-0332.

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Johannessen, Thomas B. "High Frequency Loading and Response of Offshore Structures in Steep Waves." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50110.

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Offshore structures such as the TLP or the GBS have natural frequencies which are much higher than the frequencies of the incident waves in the survival conditions. Nevertheless, many offshore structures experience significant resonant response of modes with periods in the range of 2s to 5s, particularly in steep waves. In particular the ringing response of offshore structures characterised by sudden, large and isolated resonant response packets, has been a concern for many years. The loads which give rise to these events are difficult to describe both because they are small in magnitude relative to the load level close to the wave spectral peak and also because they are nonlinear in nature. In the present paper, available theoretical methods for high frequency loading is employed for irregular waves and compared with model tests. The methods which are used in the present are first and second order diffraction methods as well as a third order loading model for slender cylinders applied to irregular waves with continuous wave spectra. The results are compared with measurements of tether response and overturning moments on a TLP and a GBS respectively. Provided that the incident waves are treated carefully and care is taken in treating the high frequency tail of the incident wave, it is found that methods which are presently available give a good representation of the resonant response for the GBS structure. The GBS structure has a relatively low natural frequency and a mode shape which is excited easily by horizontal loading in the surface zone. In contrast, weakly nonlinear theory does not capture the high frequency loading on a TLP which has resonant frequencies at more than five times the spectral peak in the survival seastates. For this case it is found that wave impact with both the columns and the deck gives significant contributions to the resonant tether response. This is the case even if no significant horizontal deck impact is observed and highlights the need for a reliable deck impact load model.

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Sun, Q. D., B. Indraratna, and S. Nimbalkar. "The Deformation and Degradation of Granular Material under High-Frequency Cyclic Loading." In Geotechnical and Structural Engineering Congress 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784479742.145.

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Yang, H., S. Ho, and A. Przekwas. "A numerical study of a two-dimensional foil subject to high reduced frequency gust loading." In Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-2266.

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Sheng, Zhiqing, and Yunhua Li. "An improved hybrid suppression method for extraneous force of high-frequency electro-hydraulic loading system." In 2015 IEEE International Conference on Advanced Intelligent Mechatronics (AIM). IEEE, 2015. http://dx.doi.org/10.1109/aim.2015.7222567.

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Huang, X., L. Xu, R. Wang, J. Wang, and X. Yin. "Research on Heavy-Loading Thermal Spray Turntable with High Precision and Self Controlled Frequency Conversion." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0871.

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Abstract This paper discusses the basic design and operating characteristics of a precision heavy-duty thermal spray turntable. The system incorporates eccentricity and speed control and accommodates working pieces up to 100 mm in diameter and 2000 mm in height weighing as much as 1500 kg. Site tests, as reported in the paper, indicate that the turntable also meets dust and heat tolerance requirements.

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Francis, Benjamin, and David Mair. "High Frequency Fatigue and Using Frequency Domain Techniques." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21392.

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Abstract In recent years API 579 has provided the analyst with a detailed outline of the Wang-Brown algorithm (WBCC) for the cycle counting. The WBCC algorithm has become the generally accepted core of cycle counting implementations whenever multi-axial non-proportional fatigue stress histories are encountered. However, for vibration based fatigue, in the absence of any time history at all; it is common in industry to assess fatigue using frequency domain techniques. This paper presents special considerations for determination of the spectral stress fatigue in the spirit of API 579. In the frequency domain the stress cycles are counted a priori as a set of complex vectors. These complex stress vectors may represent the full stress tensor of a reduced set in an appropriate sub-space. The phase relationship between the vectors represents the time delay between the stress components of the stress field. This paper presents some of the actions that are necessary in order to accurately capture the phase relationships. It is often the case that the physics of the driving loads are either unknown or too complex to practically model. This is the case for complex fluid and particle interactions with vessel shells, piping or other wetted surfaces. This paper presents some tools and techniques that can be applied in order to characterize the loading spectrum in a manner which is specifically designed to capture the important fatigue characteristics. Any fatigue estimation technique must convert the stress vector set into a singularly dimensioned scalar metric that represents the stress amplitude of a cycle. However, the maximum stress amplitude from the cycle is not immediately accessible from the complex stress vectors. While a number of papers present techniques that are intended to calculate the maximum stress amplitude in the case where the stress metric is the equivalent stress this paper provides a slightly more general relation for the phase of the maximum amplitude. Finally the analyst must compare their calculated fatigue stress amplitudes to the API 579 fatigue curves. Closed form expressions for mono-linear spectral fatigue have been extensively investigated in the literature but more complex fatigue curves do not have such simple solutions. To this end this paper investigates the smooth bar carbon steel fatigue curves of ASME VIII-2.

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Khurshid, Mansoor, Zuheir Barsoum, and Gary Marquis. "Behavior of Compressive Residual Stresses in High Strength Steel Welds Induced by High Frequency Mechanical Impact Treatment." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97042.

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Residual stress state plays an important role in the fatigue life of welded structures. They can be beneficial or detrimental, depending on the nature of residual stresses. High frequency mechanical impact (HFMI) treatment is a post-weld fatigue improvement technique for welded joints. In this research work the behavior of compressive residual stresses induced in welded joints in high strength steels (HSS) by HFMI treatment has been investigated. Longitudinal non load carrying attachments in HSS are tested with constant amplitude (CA) and variable amplitude (VA) loading. Stress concentration factors have been calculated using Finite Element Analysis (FEA). Residual stresses have been measured at different cycles during fatigue testing using X-ray diffraction technique. It is observed that the induced residual stresses are quite stable with some relaxation in CA and VA loading. The overloads in VA loading seem to be more detrimental. Relaxation of residual stresses is more obvious in VA tests.

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Hudak, Stephen J., James H. Feiger, and Jason A. Patton. "The Effect of Cyclic Loading Frequency on Corrosion-Fatigue Crack Growth in High-Strength Riser Materials." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20705.

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Corrosion-fatigue is a significant design consideration in deepwater floating production systems. Mechanical loading is accentuated due to the compliant nature of these structures, and sour service conditions can also occur either due to the nature of the crude production or due to seawater flooding of the reservoir to enhance production yield. New high-strength riser steels have recently been developed to meet the demands of deepwater development. The objective of this study was to characterize the corrosion-fatigue resistance of these materials in terms of crack growth rates as a function of applied stress intensity factor range (ΔK), as well as cyclic loading frequency. Experiments were performed on five different steels with yield strengths ranging from 848 to 1080 MPa. Two environments were considered: seawater with cathodic protection to simulate the environment outside of the riser, and a sour brine environment with low oxygen (< 10 ppb) to simulate the environment inside the riser. Not all steels were tested in the sour brine environment since not all were designed to operate in sour service. For both environments, higher strength steels were found to exhibit higher growth rates and lower saturation frequencies. Fatigue crack growth rates as a function of ΔK were also measured, and exhibited two different frequency responses. At high ΔK, the classical frequency response occurred: decreased frequency gave increased crack growth rates. At low ΔK, an inverse frequency effect was observed: deceased frequency gave decreased crack growth rates, as well as increased corrosion-fatigue crack growth thresholds. These differences are believed to be caused by different underlying processes controlling crack growth — specifically, material-environment reaction kinetics at high ΔK, and crack closure due to corrosion-product wedging at low ΔK. The practical significance of these results is discussed, including selection of frequencies for corrosion-fatigue crack growth testing, and applicability of results to structural integrity assessments.

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Reports on the topic "High-frequency loading"

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Fujczak, Robert R. The Effects of Fatigue Loading Frequency on Fatigue Life of HIgh- Strength Pressure Vessel Steels. Fort Belvoir, VA: Defense Technical Information Center, June 1994. http://dx.doi.org/10.21236/ada285301.

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