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Relevant bibliographies by topics / Shearing

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Academic literature on the topic 'Shearing'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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Journal articles on the topic "Shearing"

1

Koga, Nobuhiro. "Shearing." Journal of Japan Institute of Light Metals 57, no. 12 (December 30, 2007): 601–8. http://dx.doi.org/10.2464/jilm.57.601.

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SASADA, Masahiro. "Shearing." Journal of the Japan Society for Technology of Plasticity 47, no. 547 (2006): 724–26. http://dx.doi.org/10.9773/sosei.47.724.

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McGregor, B. A., K. L. Butler, and M. B. Ferguson. "The allometric relationship between clean mohair growth and the fleece-free liveweight of Angora goats is affected by liveweight change." Animal Production Science 53, no. 2 (2013): 154. http://dx.doi.org/10.1071/an12070.

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Clean fleece weight (CFWt) is affected by liveweight and change in liveweight in Merino sheep, Angora and cashmere goats. However, how these relationships progress as animals age has not been elucidated. Measurements were made over 12 shearing periods on a population of Angora goats representing the current range and diversity of genetic origins including South African, Texan and interbred admixtures of these and Australian sources. Records of breed, sire, dam, date of birth, dam age, birthweight, birth parity, weaning weight, liveweight, fleece growth and fleece quality were taken for does and castrated males (wethers) (n = 267 animals). Fleece-free liveweights (FFLwt) were determined for each goat at shearing time by subtracting the greasy fleece weight from the liveweight recorded immediately before shearing. The average of the FFLwt at the start of the period and the FFLWt at the end of the period was calculated (AvFFLwt). Liveweight change (LwtCh) was the change in FFLwt over the period between shearings. A restricted maximum likelihood model was developed for CFWt, after log10 transformation, which allowed the observations of the same animal at different ages to be correlated in an unstructured manner. A simple way of describing the results is: CFWt = κ (AvFFLwt)β, where κ is a parameter that can vary in a systematic way with shearing age, shearing treatment and LwtCh; and β is an allometric coefficient that only varies with LwtCh. CFWt was proportional to FFLwt0.67 but only when liveweight was lost at the rate of 5–10 kg during a shearing interval of 6 months. The allometric coefficient declined to 0.3 as LwtCh increased from 10 kg loss to 20 kg gain during a shearing interval. A consequence is that, within an age group of Angora goats, the largest animals will be the least efficient in converting improved nutrition to mohair.

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Hatcher, S., K. D. Atkins, and K. J. Thornberry. "Strategic use of sheep coats can improve your economic return." Australian Journal of Experimental Agriculture 48, no. 7 (2008): 762. http://dx.doi.org/10.1071/ea08036.

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Merino wethers from a mixed bloodline flock in western New South Wales were coated for varying periods of time after shearing between August 1999 and August 2000. The coated and a similar number of uncoated control wethers from each of nine bloodlines (three fine and six superfine) were grazed together as part of a larger mob. Dyebands were placed in the fleeces of each wether before fitting of the coats and were removed before shearing when a midside sample was taken and several subjective assessments and objective measurements were made of each fleece. It was concluded that coating sheep for 6 months after shearing is as effective in improving the quality of the Merino fleece as coating for the entire 12 month period between annual shearings. Strategic coating of sheep after shearing is a viable option for wool producers to both reduce some of the management implications of coating and extend the useful life of sheep coats. Importantly, the magnitude of the net financial gain will vary according to the prevailing micron premium and premiums and discounts applied to style and vegetable matter. A software tool is described that allows producers to identify the potential financial gain in any market scenario.

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Hofmann, K. H., and G. Weigelt. "High angular resolution shearing spectroscopy and triple shearing interferometry." Applied Optics 25, no. 23 (December 1, 1986): 4280. http://dx.doi.org/10.1364/ao.25.004280.

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Hudson, P. R. W. "High Technology Options for Sheep Shearing: Improved Shearing Devices." Outlook on Agriculture 15, no. 4 (December 1986): 218–24. http://dx.doi.org/10.1177/003072708601500408.

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Wool production is a very important factor in the Australian economy, representing $3 billion in exports. Nevertheless, rising production costs and growing competition from manmade fibres necessitate increased attention to all aspects of productivity if the industry worldwide is to remain viable. As some 80 per cent of labour content is involved in harvesting wool, improvements in the shearing process potentially offer particular opportunities for economies. This article reviews the results of a widely based Australian research programme which has investigated the fundamental physics of wool severance, especially in terms of energy requirement, leading to improved design of shearing devices incorporating more efficient motors and novel cutter materials. Subsequent articles will review the process of automated mechanical shearing and chemical and biological defleecing.

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Omolayo, M. Ikumapayi, A. Afolalu Sunday, S. Fatoba Olawale, A. Kazeem Rasaq, A. Adetunla Adedotun, and O. Ongbali Samuel. "A Concise Study on Shearing Operation in Metal Forming." E3S Web of Conferences 309 (2021): 01004. http://dx.doi.org/10.1051/e3sconf/202130901004.

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This study outlines the recent developments in metal forming processes, focusing mainly on the shearing process. A summary of the background of the shearing process is given to give perspective on how such a process has changed over time. It explains what shearing operations are and how the shearing process is operated in metal forming. While also outlining the difference between shearing, slitting, punching, notching, and blanking processes, and the advantages and disadvantages of the shearing process are detailed. Different types of modern shearing machines are documented. The ways of ensuring the optimal functionality of the shearing machine and how the shearing operation has improved the manufacturing products were scripted. Three cases were given on the recent advancement in the use of shearing operation. Recommendations on how to improve efficiency in shearing metal forming are specified with relevance to the theory and a conclusion is drawn.

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Mears, G. J., F. A. Brown, and L. R. Redmond. "Effects of handling, shearing and previous exposure to shearing on cortisol and β-endorphin responses in ewes." Canadian Journal of Animal Science 79, no. 1 (March 1, 1999): 35–38. http://dx.doi.org/10.4141/a98-013.

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The objectives of the study were to compare the effects of handling and shearing on plasma cortisol and β-endorphin levels of ewes and to determine if adaptation to annual shearing occurred. Plasma cortisol and β-endorphin concentrations were determined during either handling only or handling plus shearing in 12 ewes previously exposed to annual shearing (1–4 times) and in 12 naïve ewes. The handling process consisted of four steps: 1) moving ewes from their quarters into the shearing room; 2) moving them in groups of four into a holding pen; 3) moving them in pairs to a shearing platform where they were up-ended and restrained as in shearing; and 4) moving them into another holding pen in the shearing room. Half of the ewes were sheared during step 3 of the handling process. Handling and shearing elevated (P < 0.0001) plasma cortisol and β-endorphin concentrations, but the responses to the handling process and to the handling plus shearing process were similar (P > 0.1). Moving the ewes from their quarters to the shearing platform resulted in significantly higher plasma cortisol, which remained elevated for 60 min. Plasma β-endorphin was only transiently elevated after shearing was completed. Previous exposure to shearing enhanced the cortisol (P < 0.001) and β-endorphin (P < 0.05) responses to handling and shearing. Both responses were significantly greater and longer in the ewes sheared previously. The results indicate that the stress response to handling was equivalent to that of handling plus shearing, and that the stress response was much greater in ewes previously exposed to annual shearing. Key words: Cortisol, β-endorphin, negative adaptation, shearing, stress, ewes

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Willard, Berton C. "Rotational Shearing Interferometer." Applied Optics 32, no. 34 (December 1, 1993): 7118. http://dx.doi.org/10.1364/ao.32.007118.

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Tuan, Le Zhuĭ, and V. K. Kirillovskiĭ. "Computerized shearing interferometer." Journal of Optical Technology 75, no. 3 (March 1, 2008): 156. http://dx.doi.org/10.1364/jot.75.000156.

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Dissertations / Theses on the topic "Shearing"

1

Huang, Jen-Rong. "Optoelectronic speckle shearing interferometry." Thesis, Cranfield University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309680.

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Sharrock, Glenn. "Tool shearing of granular media /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17559.pdf.

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Mui, Tak Sang. "The shearing effect of suction /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20MUI.

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Iscimen, Mehmet. "Shearing Behavior Of Curved Interfaces." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7256.

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The frictional behavior of soil-construction material interfaces is of significant importance in geotechnical engineering applications such as retaining structures, pile foundations, geosynthetic liners, and trenchless technologies. Since most failures initiate and develop on the interfaces, special attention is required to predict the capacity of these weak planes in the particular application. Pipe-jacking and microtunneling technologies are being more widely used over the past decade and there is significant interest to predict the jacking forces and jacking distances achievable in order to achieve more efficient design and construction. This study focuses on the evaluation of the frictional characteristics and factors affecting the shear strength of pipe-soil interfaces. Eight different pipes made from fiber reinforced polymer (FRP), polycrete, steel, concrete, and vitrified clay were tested in the experimental program. For this purpose, a new apparatus was designed to conduct conventional interface direct shear testing on pipes of different curvature. This device allows coupons cut from actual conduits and pipes to be tested in the laboratory under controlled conditions. The apparatus includes a double-wall shear box, the inner wall of which is interchangeable to allow for testing against surfaces of different curvatures. By considering a narrow width section, the circular interface of pipes was approximated with a surface along the axial direction and the boundary is defined by the inner box. Roughness tests were performed using a stylus profilometer to quantify the surface characteristics of the individual pipes and relate these to the interface shear behavior. The surface topography showed different degrees of variability for the different pipes. To extend the range of roughness values tested and force the failure to occur in the particulate media adjacent to the interface, two artificial pipe surfaces were created using rough sandpapers. Interface shear tests were performed using the new apparatus with air-pluviated dense specimens of Ottawa 20/30 sand. Additional tests were performed using Atlanta blasting sand to evaluate the effect of particle angularity. The effect of normal stress and relative density were also examined. The interface strength was shown to increase with surface roughness and finally reach a constant value above a certain critical roughness value, which corresponded to the internal strength of the soil itself. This represented the failure location moving from the interface into the soil adjacent to the interface. Both the strength and the shearing mechanism were thus affected by the surface topography. It was also shown that the interface shear strength was affected by particle angularity, relative density and normal stress.

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Zhao, Qibin. "Oscillatory shearing in polymer opals." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709151.

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Gustafsson, Emil. "Experiments on Sheet Metal Shearing." Licentiate thesis, Högskolan Dalarna, Materialteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:du-21356.

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Jones, A.-Andrew D. III (Akhenaton-Andrew Dhafir). "Exoelectrogenic biofilm growth in shearing flows." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115610.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis. Pages 100 and 101 blank.
Includes bibliographical references.
Microbial biofouling occurs when a biofilm adheres to materials involved in liquid transport causing economic loss through corrosion and drag losses on ship hulls, and in oil and food distribution. Microorganisms interacting with surfaces under these open channel flows contend with high shear rates and active transport to the surface. The metallic surfaces they interact with carry charge at various potentials that are little addressed in literature. We demonstrate for the first time that mass transport limiting current, chronoamperometry, and cyclic voltammetry in a rotating disk electrode are ideal for studying adhesion of microbes to metallic surfaces under shear. We study the adhesion of Escherichia coli, Bacillus subtilis, and 1 μm silica microspheres over a range of shear stresses. Our results agree with literature on red blood cells in rotating disk electrodes and deposition rates of B. subtilis and E. coli from optical systems, and show that we can quantify changes in active electrode area by bacteria adhesion and protein secretion.
Our methodology measures changes in area instead of mass simultaneously providing measurements of the protein binding step that initiates biofilm formation. Unlike fluorescence microscopy, these methods are in vivo and apply to a larger range of problems than on-chip flow devices. We also use the rotating disk system to present the first study of how electroactive biofilms adapt to shear stress over time. These biofilms are unique in that they do not rely on electron acceptor diffusion as they are "wired" to the electron acceptor, leading to thicker biofilms. Furthermore, it is possible to use the current produced by the biofilms as a proxy for metabolic respiration. We measure current, open circuit potential, electron diffusion current, electrochemical impedance, and formal potential throughout the course of seven days of Geobacter sulfurreducens forming a biofilm on a graphite disk exposed to three different shear stresses (1, 0.1, 0.01 Pa) and fixed mass flux. We image the resulting biofilm to measure biofilm thickness, porosity, and surface roughness. We find that high shear rates lead to faster start-up times and higher current, and by proxy higher metabolic rates, at the cost of long term sustainability of this current. We also find that there was no statistical difference in thickness or surface roughness between biofilms of different stresses. Similar to previous work, we propose that the lack of stability is due to the absence of waste removal. Our results are the first to show that the rotating disk system can be used investigate biofilm's development, metabolism, and structure from initiation to decay in vivo under fluid shear stress and electrical stress conditions that occur in our engineered environments. Future work using this system can include increased sampling frequency to understand start-up behavior and analysis of how mixed cultures modify adhesion, start-up respiration rates, and waste removal.
by Akhenaton-Andrew Dhafir Jones, III.
Ph. D.

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Loufman, Michael. "Diatomic Interaction Simulations in Shearing Flows." Miami University Honors Theses / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=muhonors1110922735.

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Curran, Dian Beard. "Magnetic shearing instabilities in accretion disks /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Ravotti, Davide. "Mixing via shearing in some parabolic flows." Thesis, University of Bristol, 2018. http://hdl.handle.net/1983/3223f101-f30e-4877-b4e5-07be52945a9d.

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Parabolic flows are slowly chaotic flows for which nearby trajectories diverge polynomially in time. Examples of smooth parabolic flows are unipotent flows on semisimple Lie groups and nilflows on nilmanifolds, which are both well-understood. Beyond the homogeneous set-up, however, very little is known for generic smooth parabolic flows and a general theory about their ergodic properties is missing. In this thesis, we study three classes of smooth, non-homogeneous parabolic flows and we show how a common geometric shearing mechanism can be exploited to prove mixing. We first establish a quantitative mixing result in the setting of locally Hamiltonian flows on compact surfaces. More precisely, given a compact surface with a smooth area form, we consider an open and dense set of locally Hamiltonian flows which admit at least one saddle loop homologous to zero and we prove that the restriction to any minimal component of typical such flows is mixing. We provide an estimate of the speed of the decay of correlations for a class of smooth observables. We then focus on perturbations of homogeneous flows. We study time-changes of quasi-abelian filiform nilflows, which are nilflows on a class of higher dimensional nilmanifolds. We prove that, within a dense set of time-changes of any uniquely ergodic quasi-abelian filiform nilflow, mixing occurs for any time-change which is not cohomologous to a constant, and we exhibit a dense set of explicit mixing examples. Finally, we construct a new class of perturbations of unipotent flows in compact quotients of SL(3,R) which are not time-changes and we prove that, if they preserve a measure equivalent to Haar, then they are ergodic and, in fact, mixing.

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Books on the topic "Shearing"

1

Cantrell, Charles Thomas. The 20th century Shearin genealogy: Shearing, Shearon, Shearron, Sheron, Sherron. [Brentwood, TN] (1208 Norton Court, Brentwood 37027): C.T. Cantrell, 1996.

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Cantrell, Charles Thomas. The 20th century Shearin genealogy and variant spelling of the name: Shearin, Shearing, Shearon, Shearron, Sheron, Sherron. 2nd ed. Brentwood, Tenn. (1208 Norton Court, Brentwood 37027): C.T. Cantrell, 1999.

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3

New Zealnd. New Zealand Wool Board. The shearing handbook. Wellington: The Shearing Service, New Zealand Wool Board, 1993.

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Ford, Kevin. Shearing day: Sheep handling, wool science, and shearing with blades. Charlemont, Mass: Feet on the Ground Press, 1999.

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Marsh, Bill. Great Australian shearing stories. Sydney, N.S.W: ABC Books, 2007.

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Marsh, Bill. Great Australian shearing stories. Sydney, N.S.W: ABC Books, 2007.

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Marsh, Bill. Great Australian shearing stories. Sydney, N.S.W: ABC Books, 2007.

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8

Estabrooks, G. F. Shearing balsam fir Christmas trees. Fredericton, N.B: Canadian Forestry Service - Maritimes, 1986.

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9

Goodwin, Geraint. The shearing and other stories. Llanrwst: Carreg Gwalch, 2004.

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1957-, Baxter Selina, ed. To ring the shed. South Fremantle, W.A: Fremantle Arts Centre Press, 1995.

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Book chapters on the topic "Shearing"

1

Gooch, Jan W. "Shearing." In Encyclopedic Dictionary of Polymers, 657. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10526.

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Lynch, Gordon S., David G. Harrison, Hanjoong Jo, Charles Searles, Philippe Connes, Christopher E. Kline, C. Castagna, et al. "Shearing." In Encyclopedia of Exercise Medicine in Health and Disease, 786. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-29807-6_3028.

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Behrens, Bernd-Arno. "Billet Shearing." In CIRP Encyclopedia of Production Engineering, 1–5. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-35950-7_16803-1.

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Gooch, Jan W. "Shearing Strength." In Encyclopedic Dictionary of Polymers, 657. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10527.

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Gooch, Jan W. "Shearing Stress." In Encyclopedic Dictionary of Polymers, 657. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10528.

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Behrens, Bernd-Arno. "Billet Shearing." In CIRP Encyclopedia of Production Engineering, 140–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_16803.

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Huilgol, Raja R., and Georgios C. Georgiou. "Unsteady Shearing Flows." In Fluid Mechanics of Viscoplasticity, 161–92. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98503-5_6.

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Berzi, Diego, and James T. Jenkins. "Dense, Inhomogeneous, Granular Shearing." In Advances in Mechanics and Mathematics, 21–38. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49267-0_2.

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Rush, Beth. "Shearing Injury, Shear Strain." In Encyclopedia of Clinical Neuropsychology, 3168–69. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-57111-9_277.

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Drew, Donald A., and Stephen L. Passman. "Solutions for Shearing Flows." In Theory of Multicomponent Fluids, 254–72. New York, NY: Springer New York, 1999. http://dx.doi.org/10.1007/0-387-22637-0_22.

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Conference papers on the topic "Shearing"

1

RuDeng, Wang, He Wei, and Chen Shiming. "Shearing Photoelasticity." In 1988 International Congress on Optical Science and Engineering, edited by Werner P. O. Jueptner. SPIE, 1989. http://dx.doi.org/10.1117/12.950247.

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Rupeng, Wang, Du Bin, and Xu Zhu. "Shearing Photoelasticity." In SPIE International Symposium on Optical Engineering and Industrial Sensing for Advance Manufacturing Technologies, edited by Y. Y. Hung and Ryszard J. Pryputniewicz. SPIE, 1988. http://dx.doi.org/10.1117/12.947671.

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Matsuda, Kiyofumi. "Shearing interferometry." In Selected Papers from the International Conference on Optics and Optoelectronics, edited by Kehar Singh, Om P. Nijhawan, Arun K. Gupta, and A. K. Musla. SPIE, 1999. http://dx.doi.org/10.1117/12.346805.

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Strojnik, Marija, Beethoven Bravo-Medina, Guillermo Garcia-Torales, Azael Mora-Nuñez, and Eduardo de la Fuente. "Differential shearing interferometer." In Infrared Remote Sensing and Instrumentation XXV, edited by Marija Strojnik and Maureen S. Kirk. SPIE, 2017. http://dx.doi.org/10.1117/12.2275343.

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Strojnik, Marija, Guillermo Garcia-Torales, and Gonzalo Paez. "Vectorial shearing interferometer." In International Conference on Optical Metrology, edited by Malgorzata Kujawinska and Mitsuo Takeda. SPIE, 1999. http://dx.doi.org/10.1117/12.357757.

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Kandis, Janis, Henry Valberg, and Wu Wenbin. "On The Mechanics Of The Shearing Process in Bar Shearing." In THE 14TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2011. AIP, 2011. http://dx.doi.org/10.1063/1.3589583.

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Sweatt, W. C., and R. C. Duffus. "Rotating Shearing Plate Interferometer." In 31st Annual Technical Symposium. SPIE, 1987. http://dx.doi.org/10.1117/12.978899.

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Ghadyani, Z. "Inhomogeneous radial shearing technique." In Photonics Asia 2007, edited by Yongtian Wang, Theo T. Tschudi, Jannick P. Rolland, and Kimio Tatsuno. SPIE, 2007. http://dx.doi.org/10.1117/12.758598.

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Tang, Guomao, Mingquan Li, Jiaxi Huang, and Wenhan Jiang. "Photon-counting shearing interferometer." In Photoelectronic Detection and Imaging: Technology and Applications '93, edited by LiWei Zhou. SPIE, 1993. http://dx.doi.org/10.1117/12.142065.

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Wang, Hongjun, Cong Zhang, Ailing Tian, and Bingcai Liu. "Influence of shearing displacement error study on two dimensional lateral shearing interferometry." In The International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference (icPOE 2014), edited by Ailing Tian, Anand Asundi, Weiguo Liu, and Chunmin Zhang. SPIE, 2015. http://dx.doi.org/10.1117/12.2083156.

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Reports on the topic "Shearing"

1

Balmforth, N. J., and P. J. Morrison. Singular eigenfunctions for shearing fluids I. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/41380.

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Hahm, T. S. E x B shearing rate in quasi-symmetric plasmas. Office of Scientific and Technical Information (OSTI), June 1997. http://dx.doi.org/10.2172/304190.

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Richardson, Jonathan William. Experimental Constraints of the Exotic Shearing of Space-Time. Office of Scientific and Technical Information (OSTI), August 2016. http://dx.doi.org/10.2172/1329050.

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Ali, Usman, Mamoru Kikumoto, Matteo Ciantia, and Ying Cui. Direct observation of particle kinematics in biaxial shearing test. University of Dundee, December 2021. http://dx.doi.org/10.20933/100001233.

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Biaxial shearing tests on dual-sized, 2d particle assemblies are conducted at several confining pressures. The effect of particle angularity, an important mesoscale shape descriptor, is investigated at the macro and micro levels. Macroscopically, it is observed that assemblies composed of angular particles exhibit higher strengths and dilations. The difference observed in bulk behavior due to particle angularity can be explained reasonably by considering particle-level mechanisms. A novel 2D image analysis technique is employed to estimate particle kinematics. Particle rotation results to be a key mechanism strongly influenced by particle shape determining the overall granular behavior. Unlike circular particles, angular ones are more resistant to rotations due to stronger interlocking and consequently exhibit higher strengths.

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Sharma, Prateek, Gregory, W. Hammett, Eliot Quataert, and James, M. Stone. Shearing Box Simulations of the MRI in a Collisionless Plasma. US: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ, August 2005. http://dx.doi.org/10.2172/878172.

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Nohel, J. A., R. L. Pego, and A. E. Tzavaras. Stability of Discontinuous Shearing Motions of a Non-Newtonian Fluid. Fort Belvoir, VA: Defense Technical Information Center, July 1989. http://dx.doi.org/10.21236/ada210643.

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Rogers, H. C. Investigations of the Material Factors in the Adiabatic Shearing of Steels. Fort Belvoir, VA: Defense Technical Information Center, February 1985. http://dx.doi.org/10.21236/ada153084.

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8

Carr, S. D. Ductile shearing and brittle faulting in Valhalla gneiss complex, southeastern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120029.

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9

Kinikles, Dellena, and John McCartney. Hyperbolic Hydro-mechanical Model for Seismic Compression Prediction of Unsaturated Soils in the Funicular Regime. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, December 2022. http://dx.doi.org/10.55461/yunw7668.

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Abstract:

A semi-empirical elasto-plastic constitutive model with a hyperbolic stress-strain curve was developed with the goal of predicting the seismic compression of unsaturated sands in the funicular regime of the soil-water retention curve (SWRC) during undrained cyclic shearing. Using a flow rule derived from energy considerations, the evolution in plastic volumetric strain (seismic compression) was predicted from the plastic shear strains of the hysteretic hyperbolic stress-strain curve. The plastic volumetric strains are used to predict the changes in degree of saturation from phase relationships and changes in pore air pressure from Boyle’s and Henry’s laws. The degree of saturation was used to estimate changes in matric suction from the transient scanning paths of the SWRC. Changes in small-strain shear modulus estimated from changes in mean effective stress computed from the constant total stress and changes in pore air pressure, degree of saturation and matric suction, in turn affect the hyperbolic stress-strain curve’s shape and the evolution in plastic volumetric strain. The model was calibrated using experimental shear stress-strain backbone curves from drained cyclic simple shear tests and transient SWRC scanning path measurements from undrained cyclic simple shear tests. Then the model predictions were validated using experimental data from undrained cyclic simple shear tests on unsaturated sand specimens with different initial degrees of saturation in the funicular regime. While the model captured the coupled evolution in hydro-mechanical variables (pore air pressure, pore water pressure, matric suction, degree of saturation, volumetric strain, effective stress, shear modulus) well over the first 15 cycles of shearing, the predictions were less accurate after continued cyclic shearing up to 200 cycles. After large numbers of cycles of undrained shearing, a linear decreasing trend between seismic compression and initial degree of saturation was predicted from the model while a nonlinear increasing-decreasing trend was observed in the cyclic simple shear experiments. This discrepancy may be due to not considering post shearing reconsolidation in the model, calibration of model parameters, or experimental issues including a drift in the position of the hysteretic shear-stress strain curve. Nonetheless, the trend from the model is consistent with predictions from previously- developed empirical models in the funicular regime of the SWRC. The developments of the new mechanistic model developed in this study will play a key role in the future development of a holistic model for predicting the seismic compression across all regimes of the SWRC.

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Liu, Wu-ming, P. Z. Takacs, and D. P. Siddons. Applications of the lateral shearing interferometer in measurement of synchrotron radiation optical elements. Office of Scientific and Technical Information (OSTI), November 1987. http://dx.doi.org/10.2172/5609599.

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