Relevant bibliographies by topics / Size of deformations

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Size of deformations'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Size of deformations"

1

Rojas, Eduardo, Jaime Horta, and María de la Luz Pérez-Rea. "Modeling the soil-water retention curves for highly deforming soils." MATEC Web of Conferences 337 (2021): 02003. http://dx.doi.org/10.1051/matecconf/202133702003.

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A porous-solid model based on the grain and pore size distributions of the soil is coupled with a mechanical model to simulate the soil-water retention curves while the material is deforming. During the determination of the main drying curve, the soil is subjected to high suctions which induce important volumetric deformations. These volumetric deformations modify the pore size distribution of the sample affecting both the drying and the wetting retention curves. Although, most deformation occurs at drying, the drying curve is only slightly affected by soil deformation. In contrast, the wetting curve shows important shifting when volume change is considered.
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Ma, Dan, Yan Dong Qu, and Xiang Qing Kong. "Error Analysis in Calculating the Internal Force of Plane Statically Determinate Truss by the Original Size Principle." Applied Mechanics and Materials 268-270 (December 2012): 1168–71. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1168.

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Ignoring the deformation effect, the original size principle is normally used to calculate the internal force and deformations of the bars in Mechanics of Materials, the calculation error is not discussed in the textbooks, however. In order to show the adaptability of the original size principle to calculate the internal force of plane statically determinate truss, a case of the two-bar statically determinate truss was also given. The calculation error of the internal force and the angle deformations are quantitatively studied to make a comparison between the actual internal force and that calculated by the original size principle. The research showed that the relative error of angle deformations and the internal forces of the two rods are nonlinear dependent on the external forces (the given force), tensile stiffness and the initial angle of the plane truss. If the strength and tensile stiffness of the bars can meet the requirements of engineering, the original size principle can be used to calculate the internal force of metallic bar truss under the conditions of small deformations.
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Vershina, G. A., and L. E. Reut. "Influence of Elastic Core on Size of Ring Product under Bending of Fluoroplastic Band." Science & Technique 18, no. 1 (February 12, 2019): 21–31. http://dx.doi.org/10.21122/2227-1031-2019-18-1-21-31.

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The paper is devoted to study of a possibility to manufacture fluoroplastic products while using method of cold deformation of pressed blanks and research of peculiar features in mechanical behavior of fluoroplastic which are revealed during deformation that affects quality and accuracy of the manufactured parts. Manufacturing technique of fluoroplastic sealing rings which are obtained while using method of coiling a band blank on a cylindrical mandrel with further endurance in a wound state and subsequent cutting of a spiral on rings has been considered in the paper. An important stage in the development of the technological process is a calculation and a design of a tool (mandrel caliber) that ensure obtaining of ring products with the required size and shape. Deformation behavior of fluoroplastic under conditions of force action is significantly different from the behavior of the known classical materials and it has a number of specific features and manifestations. Therefore the problem for creation of a calculation methodology for tool development looks as a complicated one and it requires a justified approach while selecting a mechanical model of polymer. Considering the fact that fluoroplastic has a structure with a high degree of crystallinity, a mechanism and sequence of deformations in it due to load are largely similar to the behavior of metals and other low-molecular materials. It allows to use methods and approaches adopted in the mechanics of solids for a calculation of fluoroplastic products however it is necessary to take into account the fact that deformation processes in polymers proceed in time and have a different nature of elastic and residual deformations. When bending the fluoroplastic band in case of winding it on the mandrel residual deformations which provide the required size and shape play the most significant role. However elastic deformations which cause springing and change of size in a finished product after removal of loading are also important. It has been proved that an elastic zone of finite width which has a certain influence on accuracy of manufactured products with due account of all accumulated elastic deformations will be present in the field of a neutral layer even at high degrees of deformation. In this case, fluoroplastic is a multi-modulus material having elasticity which at stretching is significantly higher than in compression, and therefore elastic recovery is more associated with the area of stretched fibers. The authors have developed a methodology for calculation of the tool for obtaining rings of the required size on the basis of the analysis pertaining to deformation behavior of the fluoroplastic while taking into account specificity of its mechanical properties. The proposed methodology with a sufficient degree of accuracy is consistent with the results of experimental studies.
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Ivanova, Tatiana N., Witold Biały, Jiři Fries, and Victor Nordin. "Technological Forecasting of Deformations in Flat Parts." Multidisciplinary Aspects of Production Engineering 3, no. 1 (September 1, 2020): 1–12. http://dx.doi.org/10.2478/mape-2020-0001.

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AbstractThe deformation of a part occurring in the process of grinding directly influences its exploitation and quality parameters. The instability of shape and size, which occurs due to an imbalance of residual stress, can be the one of the major causes of deformation of a part. The decrease in stress slows down the deformation process. Considering the regularities of heat source intensity dependence on the grinding modes, it can be asserted that with increasing grinding depth and grinding wheel hardness, the value increases and it decreases with a growth in a speed of the part and the use of cooling. The higher the heat removal is and the better lubricant properties of the liquid are, the more significant the decrease in is. Changing these values allows regulation of the residual stresses. As a result of the research on determination of deformations, it is recommended to reduce thermal deformations by considering the geometric size of a plate to be machined, linear expansion coefficient of plate material and an allowance for nonflatness from thermal deformations. The value of nonflatness from thermal deformations is directly proportional to linear expansion coefficient of plate material and its square overall dimensions. At the same time, the value of nonflatness is inversely proportional to the plate thickness.
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Piekarska, Wiesława, Zbigniew Saternus, Milan Sapieta, and Peter Kopas. "The influence of joining technique on the deformation of laser welded T-joints." MATEC Web of Conferences 254 (2019): 02011. http://dx.doi.org/10.1051/matecconf/201925402011.

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T-joints are often used in large-scale welded constructions. The use of a laser beam for welding allows to create joints using various techniques. Used welding method affects the shape and size of heat affected zone, deformation of welded elements and consequently the quality of the joint. This work concerns the numerical modeling of the size of heat affected zone and welding deformations in T-joint obtained with two different welding techniques: single-side fillet T-joint and butt welded T-joint, called I-core welded joint. Numerical simulations are carried out in the commercial Abaqus FEA software, supplemented by an additional numerical subroutines which enabled the analysis of thermomechanical phenomena occurring in welding process. Mathematical model of a moveable welding source and the description of heat source positioning relative to the edges of the connected elements are described in numerical subroutines. The material parameters of austenitic steel are taken into account. The size of deformations of welded joints are determined as well as the influence of two different joininig techniques of T-joint on the amount of generated welding deformations are analyzed and compared.
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Markiewicz, Włodzimierz. "Remarks on the Automatic Cylinder Oil Mixing System for Two Stroke Dual Fuel Crosshead Marine Engines." Multidisciplinary Aspects of Production Engineering 3, no. 1 (September 1, 2020): 13–27. http://dx.doi.org/10.2478/mape-2020-0002.

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AbstractThe deformation of a part occurring in the process of grinding directly influences its exploitation and quality parameters. The instability of shape and size, which occurs due to an imbalance of residual stress, can be the one of the major causes of deformation of a part. The decrease in stress slows down the deformation process. Considering the regularities of heat source intensity dependence on the grinding modes, it can be asserted that with increasing grinding depth and grinding wheel hardness, the value increases and it decreases with a growth in a speed of the part and the use of cooling. The higher the heat removal is and the better lubricant properties of the liquid are, the more significant the decrease in is. Changing these values allows regulation of the residual stresses. As a result of the research on determination of deformations, it is recommended to reduce thermal deformations by considering the geometric size of a plate to be machined, linear expansion coefficient of plate material and an allowance for nonflatness from thermal deformations. The value of nonflatness from thermal deformations is directly proportional to linear expansion coefficient of plate material and its square overall dimensions. At the same time, the value of nonflatness is inversely proportional to the plate thickness.
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Niu, Xing Hua, Li Qiang Cui, Bao Chuan Hao, Si Yu Liu, Zhen Tao Zhang, and Xian Li Meng. "Analysis of Plunge Milling Force and Tool Deformation on Cr12." Advanced Materials Research 652-654 (January 2013): 2173–77. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.2173.

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The paper takes the cold working die steel Cr12 for specimen material,carries out the plunge milling test on Cr12 and the plunge milling force has been measured by YDX - Ⅲ 9702 piezoelectric milling dynamometer. The tool deformations are analyzed both in plunge milling and side milling on the same size milling force. Test and analysis show that the axial milling force significantly greater than the other two directions and the tool deformation in plunge milling less than the tool deformation in the side milling.
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Yurkov, A. S. "On the flexoelectric deformations of finite size bodies." JETP Letters 99, no. 4 (April 2014): 214–18. http://dx.doi.org/10.1134/s0021364014040158.

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Yurkov, A. S. "Calculation of flexoelectric deformations of finite-size bodies." Physics of the Solid State 57, no. 3 (March 2015): 460–66. http://dx.doi.org/10.1134/s1063783415030373.

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Pesin, Alexander, Ernst Drigun, D. O. Pustovoytov, and Ilya Pesin. "Technology Development of Large-Size Bodies Manufacturing from Thick Plate Materials Based on Combined Methods of Deformation." Key Engineering Materials 685 (February 2016): 375–79. http://dx.doi.org/10.4028/www.scientific.net/kem.685.375.

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The main goal of the investigation is to determine key technological parameters, necessary for producing required curvature of sheets up to 4000 mm in width with the required mechanical properties. Investigation into dynamics of the process' main technological parameters allowed it to define its three characteristic stages: asymmetric rolling, asymmetric rolling in combination with initial unsettled plastic bending, and asymmetric rolling combined with settled plastic bending. It was found out that the intensity of the deformations changes unevenly, depending on the height of the deformation zone, on all three stages, with its highest value being in the lower part of the sheet, and with the lowest value being in its center. In the second stage, the intensity of the deformation abruptly increases, and a significant asymmetry on the sheet thickness occurs. In the third stage, the non-uniformity of the intensity deformations fields decreases. Similar results can be also observed for stress intensities. Casings on two converters were produced and installed in the oxygen-converter plant.
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Dissertations / Theses on the topic "Size of deformations"

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Gu, Rui, and 顧瑞. "Size effect on deformation of aluminum and duralumin micro-pillars." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206336.

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It is by now well-known that micron-sized metallic crystals exhibit a smaller-being-stronger size effect: the yield strength σvaries with specimen size D approximately as a power law σ~D^(-m)_, and the exponent m has been found to vary within a range of ~0.3 to ~1.0 for different metals. However, little is known about why such a power law comes into play, and what determines the actual value of the exponent m involved. In this study, the power-law scaling of size effect on strength in micro-crystals is explained in terms of the Taylor-type resistance in the dislocation network distribution in the specimen. Theoretical analysis shows that the power-law dependence of yield strength of metallic micro-specimens is derived from a fractal geometry of the initial dislocation network, with m = 3/(q + n) where q is the fractal dimension and n the stress exponent of dislocation velocity. Moderate departures of the initial dislocation structure from an exact fractal geometry may also yield approximate power-law dependence of strength on size. The plastic deformation of micro-pillars is also known to be affected by whether dislocations can escape easily from the material volume, and the extent to which they mutually interact during the deformation. In the present work, pre-straining and coating are used to modify the initial dislocation content and the constraints on the escape of dislocations. Aluminum micro-pillars with or without thin coating by tungsten deposition and pre-straining, were compressed using a flat-punch nanoindenter to study their plasticity behavior. The results reveal very different behavior between specimens in the size regime of a few microns and that about one micron, suggesting that the dominant hardening mechanisms are different. As mentioned above, pure and pristine metal micro-specimens have been found to exhibit very strong size dependence of strength, but alloyed counterparts with a much refined microstructural length scale due to the precipitates present are unknown in this aspect. Here, compression tests on duralumin (aluminum 2025 alloy) micro-pillars reveal a much weaker size dependence of strength compared to pure Al, indicating the predominance of the internal length scale in determining strength. Moreover, two-dimensional dislocation dynamics simulations are used to study precipitate strengthening effects in duralumin micro-pillars. The results show that a refined microstructure may resist and slow down the movement of dislocations inside the confined volume, leading to hardening and weak size dependence of strength. In addition to the compression behavior, the size dependence of the creep behavior of duralumin micro-pillars is also investigated at room temperature. The effects of an internal grain boundary are also investigated. The results reveal that peak-aged duralumin pillars show increasingly significant creep with increasing pillar size, with a typical creep rate of ~〖10〗^(-4) S^(-1) which is drastically larger than that of bulk at room temperature. The bi-crystalline pillars creep even faster than the single crystalline counterparts. TEM examination of the deformed microstructures reveals that the creep rate depends on the residual dislocation density, indicating that dislocations are the agents for creep. Theoretical modeling suggests that the steadystate creep rate is proportional to the lifetime of mobile dislocations, which rises with specimen size in the microns range due to the fact that the dislocations are not easily pinned in this range, therefore they spend longer time in viscous motion across the specimen, leading to a higher strain rate according to the Orowan equation.
published_or_final_version
Mechanical Engineering
Doctoral
Doctor of Philosophy
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Akasheh, Firas. "Size effects and deformation mechanisms in nanoscale metallic multilayered composites." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Spring2007/F_Akasheh_050107.pdf.

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Li, Yuan. "General size effect in the Hall-Petch effect and in micromechanical deformation." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25904.

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This thesis is a study of the size effect. Improvements on both theoretical work and experimental design are involved in this thesis. The theoretical section focuses on the grain size effect, while the experimental section is related to the micro-foil bending test. Both classic experimental data and theories for the Hall-Petch relationship are reviewed comprehensively. The fitting of the datasets show that the inverse square-root dependence and simple inverse expressions are equally good. The fully Bayesian analysis strongly suggests that the latter is correct. Since the physical mechanism underlying the simple inverse dependence is a general size effect, the precise description of the Hall-Petch effect is that it is a manifestation of the general size effect, instead of having its own special character. Improvements on the classic Stolken and Evans' micro-foil bending experiments are also carried out in this thesis. The smart design of the new equipment eliminates the big risk of error in the classic experiment. By using the new device, precise datasets from the elastic region through the yield point and to high plastic strain area can be obtained. The initial results correspond well with the old published data.
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Ssemakula, Hamzah. "Manufacturihng of heavy rings and large copper canisters by plastic deformation." Doctoral thesis, KTH, Production Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3682.

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Plastic deformation processes transform material fromas-received state to products meeting certain requirements inproperties, microstructure and shape. To achieve thistransformation, the relationship between material response andprocess conditions should be understood. This is usuallycomplicated by the complex conditions describing the actualprocess. Numerous techniques including empirical, physical,analytical and numerical can be employed.

In this thesis, numerical technique supported by lab- andfull-scale experiments has been employed to analyse the formingparameters. The first part of the thesis is focused on the useof such parameters to predict occurrence of material poresduring manufacturing of bearing rings. The second part dealswith the influence of forming parameters on the grain sizeduring fabrication of large copper canisters for encapsulationof nuclear waste. The primary task has been to study with thehelp of commercial FE-codes the magnitude and distribution offorming parameters such as accumulated effective strain,temperature, instantaneous hydrostatic pressure and materialflow at different stages of the forming process. In the firstpart, two types of ring manufacturing routes, which result inpore free and pore loaded rings are studied and compared.Material elements located in different areas of the workpiecehave been traced throughout the process. Results of theaccumulated strain and instant hydrostatic pressure have beenanalysed and presented in pressure-strain space. It’sassumed that high hydrostatic pressures together with higheffective strains are favourable for pore closure. Area of theworkpiece with unfavourable parameters have been identified andcompared with ultrasonic test results. Good agreement has beenobtained. Based on the results of this analysis, a new conceptfor avoiding pores in manufacturing of yet heavier rings hasbeen presented. The concept proposes a lighter upsetting in theinitial stage of the process and a more efficient piercingwhich results in higher hydrostatic pressure and bigger andbetter distributed effective strain.

In the second part of the thesis, the influence of formingparameters such as effective strain and temperature on thefinal grain size of the product has been studied in laboratoryscale. As-cast billets of cylindrical shape were extruded atdifferent temperatures and reductions. It has been shown thatthe grain size in the final product should be small in order toenable ultrasonic tests and to guarantee resistance towardscreep and corrosion. Simulations for different materialelements located at different distances from the axis ofsymmetry of the initial cylindrical workpiece have been carriedout. In this way, the parameters describing the deformationhistory of the elements have been determined as functions oftime. Experimentally obtained pre- and post deformation grainsize in the corresponding locations of the material weredetermined. It’s concluded that low temperature coupledwith high effective strain are conducive for obtaining a smallgrain size. Based on the beneficial conditions for extrusion ofcopper, a more detailed FE-analysis of a full-scale industrialprocess is carried out. A coarse-grained cast ingot of purecopper is heated and by upset forging formed into a cylinder,which is then punched into a hollow blank for subsequentextrusion. The blank is extruded over a mandrel through a45-degree semi-angle die. Accumulated effective strain andtemperatureas functions of the tubular wall thickness havebeen studied at five different locations along the tubularaxis. Forming load requirement as function of tool displacementfor each stage of the process has been determined. Strain andtemperature levels obtained have been related to the grain sizeinterval obtained in the earlier work. It has been concludedthat the levels reached are within the interval that ensures asmall grain size. A similar analysis has been carried out forforging of large copper lids and bottoms. Die designmodifications to improve the grain size in the lid and tooptimise the forging process with respect to forging load andmaterial yield have been proposed. A method requiring a smallforging load for fabrication of the lids has been analysed

Keywords:Pores; grain size; low forging load; effective strain;temperature; hydrostatic pressure; extrusion; forging;canister; lid; rings

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Mao, Wenqi. "Deformation mechanism of metastable austenitic steel with TRIP effect and associated kinetics of deformation induced martensitic transformation." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263657.

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Vašíček, Jiří. "Kompatibilita vozidel při čelním střetu." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-232731.

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Thesis deals with the compatibility of vehicles in a frontal collision. The first section discusses about compatibility from different views. There are the physical processes used in the mechanics of impact. The second part is focused on solving the compatibility of vehicles in a frontal collision by crash analysis using the finite element method. Firstly there are described collisions of vehicles from different vehicle classes (small cars, lower middle class, Pick up / SUV) into the fixed barrier by the US NCAP. Furthermore there are simulated head-on collisions of vehicles from different vehicle classes. In the end there is shown the possibility of using data from crash tests to determine the EES.
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Knoche, Elisabeth Marie. "Influence of the precipitate size on the deformation mechanisms in two nickel-base superalloys." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/influence-of-the-precipitate-size-on-the-deformation-mechanisms-in-two-nickelbase-superalloys(8b80d24c-62de-4741-a827-4fb5a10c752b).html.

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The polycrystalline nickel-base superalloys RR1000 and Udimet 720Li (U720Li) were developed for turbine disc applications. These alloys contain a higher volume fraction of the ordered γ' phase (close to 50%) when compared to previous generation alloys (~ 25%) in order to ensure that they retain high strength at operating temperatures exceeding 700°C. The increased percentage of precipitates in the material leads to higher levels of constraint between matrix and the precipitates, and this will have consequences for the deformation mechanisms of the aggregate. It is therefore important to understand how the increased volume fraction of precipitates affects the deformation behaviour of the material. This is not only crucial for the design of the optimum microstructure, but also for lifing models, which predict the lifetime of a component. It is the aim of the present work to improve the understanding of the deformation behaviour of these alloys by focussing on the influence of the γ' precipitate size. These alloys usually comprise a complex trimodal γ' size distribution, which complicates studies on the dependence of the deformation behaviour on the precipitate size. Hence, simplified model microstructures were generated here with a unimodal γ' size distribution. The model microstructures were subjected to in-situ loading experiments with neutron diffraction at temperatures of 20°C, 500°C and 750°C. Neutron diffraction measurements during loading revealed the elastic lattice strain response of both the γ and the γ' phases, which can indicate changes in their respective deformation behaviour. These measurements showed a load transfer from γ to γ' for some test conditions, which indicated that γ was able to deform with noticeably less deformation in the γ' phase. With a larger γ' precipitate size and/or higher test temperature, the tendency for load transfer increased. A post-mortem analysis of the deformed microstructures using advanced electron microscopy techniques (EBSD, ECCI, TEM) showed that shearing of the γ' precipitates dominated the deformed microstructures at 20°C and 500°C and was also observed after deformation at 750°C. Deformation was less localised in the microstructures with large γ' precipitates, which might be correlated with the increased trend for load transfer. The onset of multiple slip or the activation of Orowan looping as an additional deformation mechanism are suggested as possible explanations for these observations.
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Norfleet, David M. "Sample size effects related to nickel, titanium and nickel-titanium at the micron size scale." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1187038020.

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Callejas, Juan. "Induced Asymmetric Deformation of Silver Coated Micron-Sized Wires." ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/honors_theses/9.

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The stimuli response of a polymer – metal bilayer architecture was investigated. This solvent activated system showed a dynamic response when exposed to a particular solvent. Polymer wires were fabricated using a glass capillary array (GCA) as a template. The synthesized wires were then sputtered with silver and exposed to dichloromethane (DCM). The solvent activated response results in a number of physical distortions of which the circular deformation was the most predominant. The thicknesses of the metal coating and the direction of the solvent front were studied in an effort to determine their relationship to the observed wired deformations.
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Combrinck, Willem Ludwig. "Crustal deformation and geodetic site stability determination using GPS." Doctoral thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/4193.

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Books on the topic "Size of deformations"

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Fe, SITE Santa. Disparities & deformations: Our grotesque : the Fifth International SITE Santa Fe Biennial : July 18, 2004-January 9, 2005. Santa Fe, N.M: SITE Santa Fe, 2004.

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Biennial, International SITE Santa Fe. Disparities & deformations: Our grotesque : the Fifth International SITE Santa Fe Biennial : July 18, 2004-January 9, 2005. Santa Fe, NM: SITE Santa Fe, 2005.

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International SITE Santa Fe Biennial (5th 2004 Santa Fe, N.M.). Disparities & deformations: Our grotesque : the Fifth International SITE Santa Fe Biennial : July 18, 2004-January 9, 2005. Santa Fe, N.M: SITE Santa Fe, 2004.

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Mirza, M. Development of austenite grain size in high carbon pearlitic wire rod according to aluminium and nitrogen contents and hot deformation schedule. Manchester: UMIST, 1996.

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Pavelko, Michael T. Estimates of hydraulic properties from a one-dimensional numerical model of vertical aquifer-system deformation, Lorenzi site, Las Vegas, Nevada. Carson City, Nev: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

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Pavelko, Michael T. Estimates of hydraulic properties from a one-dimensional numerical model of vertical aquifer-system deformation, Lorenzi site, Las Vegas, Nevada. Carson City, Nev: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

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Morozov, Alexei. Non-Hermitian ensembles. Edited by Gernot Akemann, Jinho Baik, and Philippe Di Francesco. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780198744191.013.18.

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This article discusses the three-fold family of Ginibre random matrix ensembles (complex, real, and quaternion real) and their elliptic deformations. It also considers eigenvalue correlations that are exactly reduced to two-point kernels in the strongly and weakly non-Hermitian limits of large matrix size. Ginibre introduced the complex, real, and quaternion real random matrix ensembles as a mathematical extension of Hermitian random matrix theory. Statistics of complex eigenvalues are now used in modelling a wide range of physical phenomena. After providing an overview of the complex Ginibre ensemble, the article describes random contractions and the complex elliptic ensemble. It then examines real and quaternion-real Ginibre ensembles, along with real and quaternion-real elliptic ensembles. In particular, it analyses the kernel in the elliptic case as well as the limits of strong and weak non-Hermiticity.
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J, Ader Mark, and Geological Survey (U.S.), eds. A survey of natural fractures at the Hi Vista site, Mojave Desert, California. [Denver, Colo.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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1952-, Dodds R. H., U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Engineering Technology., University of Illinois at Urbana-Champaign. Dept. of Civil Engineering., and Naval Surface Warfare Center (U.S.). Annapolis Detachment., eds. Size and deformation limits to maintain constraint in KIc and Jc testing of bend specimens. Washington, DC: Division of Engineering Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1995.

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Physical environment of the underground nuclear test site on Novaya Zemlya, Russia. Reston, Va: U.S. Dept. of the Interior, Geological Survey, 1993.

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Book chapters on the topic "Size of deformations"

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Femandes, J. V., J. J. Gracio, and J. H. Schmitt. "Grain size effect on the microstructural evolution of copper deformed in rolling-tension." In Large Plastic Deformations, 219–28. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203749173-24.

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Kirchner, Nina P., and Kolumban Hutter. "Modelling Particle Size Segregation in Granular Mixtures." In Dynamic Response of Granular and Porous Materials under Large and Catastrophic Deformations, 367–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-36565-5_13.

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Skripnyak, Vladimir A., Evgeniya G. Skripnyak, and Vladimir V. Skripnyak. "Failure Mechanisms of Alloys with a Bimodal Graine Size Distribution." In Springer Tracts in Mechanical Engineering, 521–34. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_23.

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AbstractA multi-scale computational approach was used for the investigation of a high strain rate deformation and fracture of magnesium and titanium alloys with a bimodal distribution of grain sizes under dynamic loading. The processes of inelastic deformation and damage of titanium alloys were investigated at the mesoscale level by the numerical simulation method. It was shown that localization of plastic deformation under tension at high strain rates depends on grain size distribution. The critical fracture stress of alloys depends on relative volumes of coarse grains in representative volume. Microcracks nucleation at quasi-static and dynamic loading is associated with strain localization in ultra-fine grained partial volumes. Microcracks arise in the vicinity of coarse and ultrafine grains boundaries. It is revealed that the occurrence of a bimodal grain size distributions causes increased ductility, but decreased tensile strength of UFG alloys. The increase in fine precipitation concentration results not only strengthening but also an increase in ductility of UFG alloys with bimodal grain size distribution.
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Donatini, Pietro, Patrizio Frosini, and Claudia Landi. "Deformation Energy for Size Functions." In Lecture Notes in Computer Science, 44–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48432-9_4.

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Derby, Brian. "Dynamic recrystallization and grain size." In Deformation Processes in Minerals, Ceramics and Rocks, 354–64. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-6827-4_14.

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Mutoh, Y., Y. Miyashita, T. Hansson, and M. Takahashi. "Effect of Grain Size on Fatigue Crack Growth in Silicon Nitride and Alumina." In Plastic Deformation of Ceramics, 653–66. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1441-5_57.

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Ungár, Tamás. "The Meaning of Size Obtained from Broadened X-Ray Diffraction Peaks." In Nanomaterials by Severe Plastic Deformation, 393–406. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527602461.ch7a.

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Ninos, Nik. "Effect of Particle Size on Pyroplastic Deformation." In Whitewares and Materials: Ceramic Engineering and Science Proceedings, Volume 24, Issue 2, 230–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294796.ch36.

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Tsuji, Nobuhiro, Naoya Kamikawa, and Bo Long Li. "Grain Size Saturation during Severe Plastic Deformation." In THERMEC 2006, 2837–42. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-428-6.2837.

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Fu, Ming Wang, and Wai Lun Chan. "Size Effects in Micro-scaled Plastic Deformation." In Springer Series in Advanced Manufacturing, 9–55. London: Springer London, 2014. http://dx.doi.org/10.1007/978-1-4471-6326-8_2.

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Conference papers on the topic "Size of deformations"

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Kabova, Yu O., and O. A. Kabov. "Heater Size Effect on 3D Liquid Film Flow." In ASME 2007 5th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2007. http://dx.doi.org/10.1115/icnmm2007-30095.

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Thin liquid films may provide very high heat transfer intensity and may be used for cooling of microelectronic equipment. Investigation of the influence of size of hot spots on 3-D structures, occurring at the film surface, is the main objective of the present work. Calculations were carried out for a rectangular heater of different width. It was obtained that there is a heater size effect on 3D liquid film deformations. Film pattern changes in spanwise direction with the heater size. Calculations have been done for various liquid Reynolds numbers.
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Sovizi, Javad, Rahul Rai, and Venkat Krovi. "3D Face Recognition Under Isometric Expression Deformations." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34449.

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In this paper, 3D face recognition under isometric deformation (induced by facial expressions) is considered. The main objective is to employ the shape descriptors that are invariant to (isometric) deformations to provide an efficient face recognition algorithm. Two methods of the correspondence are utilized for automatic landmark assignment to the query face. One is based on the conventional iterative closest point (ICP) method and another is based upon the geometrical/topological features of the human face. The shape descriptor is chosen to be the well-known geodesic distance (GD) measure. The recognition task is performed on SHREC08 database for both correspondence methods and the effect of feature (GD) vector size as well as landmark positions on the recognition accuracy were argued.
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Kõrgesaar, Mihkel, and Martin Storheim. "Treatment of Bending Deformations in Maritime Crash Analyses." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19272.

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Abstract This paper focuses on the bending deformation experienced by metallic materials and its characterization during the crash analysis of ship structures. These analyses are conducted with plane stress shell elements for computational reasons. The inherent nature of through thickness plane stress poses restrictions on how the bending associated stress and strain distribution are resolved. Namely, fracture criteria used in crash analysis account bending damage accumulation differently. Most criteria do not specifically address the issue as element erosion is activated once all through thickness integration points have reached the predefined failure condition. However, when elements are bent, material layers (top and bottom) display strong variations in mechanical field variables that are commonly used to control element deletion. Therefore, the focus of current analyses is to show how different fracture criteria account bending deformation and how sensitive are the results depending on the chosen element size.
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Sasaki, Katsuhiko, Takuji Kobayashi, and Ken-Ichi Ohguchi. "Microstructural Change of Sn/37Pb and Sn/3Ag/0.5Cu Solder Alloys Subjected to Uniaxial Ratchetting Deformation." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33603.

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Ratchetting deformations of solder alloys are significant deformations for the safety and reliability of solder joints of electronic packaging. In this paper, the microstructural change of the solder alloys due to the uniaxial ratchetting deformation is evaluated to clarify the effect of the microstructure on the viscous deformation of solder alloys. The microstructures are observed after the specimens are subjected to the uniaxial ratchetting deformation during several cycle numbers. The change of the size of grains or lamella structures is used to evaluate the uniaxial ratchetting deformation of solder alloys. The observation clarifies that the differences in the microstructural change due to the uniaxial ratchetting deformation between the lead-free and lead-containing solder alloys. The uniaxial ratchetting deformation and the additional creep deformation after the ratchetting deformation is also simulated by the dislocation based constitutive model. The simulation suggests that the material parameters used in the constitutive model may be correlated to the microstructural change of the solder alloys.
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Kim, H. S., and Ö. Bilgin. "Studying the Effect of Concrete Key Size on Mechanically Stabilized Earth Wall Deformations Using Finite Element Method." In Geo-Denver 2007. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40901(220)4.

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Tomar, Vikas, and Min Zhou. "Characterization of Defect Nucleation and Propagation in Fe2O3+FCC-Al Nanocomposites During Uniaxial Tensile and Compressive Deformations." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13629.

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The objective of this research is to analyze uniaxial tensile and compressive mechanical deformations of α-Fe2O3 + fcc Al nanoceramic-metal composites using classical molecular dynamics (MD). Specifically, variations in the nucleation and the propagation of defects (such as dislocations and stacking faults etc.) with variation in the nanocomposite phase morphology and their effect on observed tensile and compressive strengths of the nanocomposites are analyzed. For this purpose, a classical molecular dynamics (MD) potential that includes an embedded atom method (EAM) cluster functional, a Morse type pair function, and a second order electrostatic interaction function is developed, see Tomar and Zhou (2004) and Tomar and Zhou (2006b). The nanocrystalline structures (nanocrystalline Al, nanocrystalline Fe2O3 and the nanocomposites with 40% and 60% Al by volume) with average grain sizes of 3.9 nm, 4.7 nm, and 7.2 nm are generated using a combination of the well established Voronoi tessellation method with the Inverse Monte-Carlo method to conform to prescribed log-normal grain size distributions. For comparison purposes, nanocrystalline structures with a specific average grain size have the same grain morphologies and the same grain orientation distribution. MD simulations are performed at the room temperature (300 K). Calculations show that the deformation mechanism is affected by a combination of factors including the fraction of grain boundary (GB) atoms and the electrostatic forces between atoms. The significance of each factor is dependent on the volume fractions of the Al and Fe2O3 phases. Depending on the relative orientations of the two phases at an interface, the contribution of the interface to the defect formation varies. The interfaces have stronger effect in structures with smaller average grain sizes than in structures with larger average grain sizes.
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Gao, Huang, and Gary J. Cheng. "A Dislocation Dynamics Based Constitutive Model and Experimental Validations by 3D Microscale Laser Dynamic Forming of Metallic Thin Films." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34300.

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Microscale Laser Dynamic Forming (μLDF) shows great potential in fabricating the robust and high-aspect-ratio metallic microcomponents by the high speed plasma shockwave. Experiments revealed that strain rate and sample size play important roles in determining the final results of μLDF. To further understand the deformation behavior, we develop a constitutive model integrating size effects and ultrahigh strain rate effects to predict the ultimate plastic deformations. To derive this model, 3-D Discrete Dislocation Dynamics (DDD) simulations are first set up to investigate the dislocation evolutions and the dynamic responses during shockwave propagation. It is observed that there exist three dynamic stages during deformation process, and the initial strain hardening rate in Stage II increases with strain rate. The simulation also reveals that stain softening occurs only for the smaller cell size due to two competing mechanisms. In addition, the simulation predicts that the flow stress and yield strength increase with the strain rate and decrease with cell size. The modified mechanical threshold stress (MTS) model integrating these effects is implemented in Abaqus/Explicit and predicts the deformation depth and thickness variations in good agreement with the experimental results.
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Han, Wei, and Ryszard J. Pryputniewicz. "Investigations of Thermal Stresses and Deformations in Laser Microwelding Processes." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43434.

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Laser microwelding has become a significant industrial process, because there are many outstanding advantages in using laser welding as the bonding method over other widely used bonding technologies. As an alternative to the common adhesives or solders used for the joining process, laser welding offers a number of attractive features such as high weld strength to weld size ratio, reliability, and a minimal heat-affected zone (HAZ). These provide the benefits of low heat distortion, a non-contact process, repeatability, and ability to automate. Therefore, the applications of laser microwelding have been broadened, especially in the microelectronic and packaging industry, in recent past decades. Quality of the laser microwelding, however, depends on a number of parameters such as the characteristics of the laser beam, environmental conditions, and properties of the workpiece. Furthermore, the large temperature gradients occur during laser microwelding process leads to a high stress level, and might result in many undesirable phenomena such as the high level of residual stresses in the vicinity of the heat-affected zone (HAZ) that adversely affect the life time of the component. Numerous studies have been performed on the evaluation and prediction of the thermal stresses in laser microwelding process. However, it is very difficult to measure the thermal stresses, and to predict the magnitude and direction of thermal stress/deformation. Therefore, we develop an optical methodology, based on opto-electronic holography (OEH) technique, to measure and evaluate the thermal stresses/deformations non-destructively. In this paper, the system of OEH measurement of the thermal deformation of the laser welds will be described in details, and representative results will be included. In addition, analytical and computational models will also be developed to simulate the temperature field and thermal stresses/deformations in laser microwelding. Continued work will lead to novel measurement system for monitoring the thermal stresses/deformations during the process of laser microwelding, which will help optimizing efficient and effective laser micro-machining processes for applications in microelectronics and packaging.
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Hu, Xinpeng, Xi Wu, Jixin Wang, and Jim Meagher. "Fault Detection of Gears With Different Root Crack Size Using Wavelet." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47263.

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Although tremendous effort has been applied to develop reliable strategies for detecting tooth cracks of gearboxes, these methods have generally fallen short of the required performance. Cracks are usually initiated at the root of a tooth and are very difficult to be identified from time-domain measurement. The vibration signal transformed by wavelet is sensitive to energy change. In this study, the transient vibration variations induced by different sizes of cracks at the tooth root are captured using wavelet. Firstly, as the main parametric excitation, the time-varying gear meshing stiffness caused by the alternating of engaged gear teeth is accurately calculated based on energy method, in which comprehensive deformations including Hertz contact, axial compression, bending, shearing and fillet-foundation deflection are taken into consideration. Moreover, a sophisticated dynamic theoretical model is used to simulate a practical gear system. Unique vibration signatures are captured through the comparison of cracked and perfect gear system.
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Banu, Mihaela, Mitica Afteni, Alexandru Epureanu, and Valentin Tabacaru. "Prediction of the Stress-Strain Response of the Ultrafine-Grained Materials Using Multi-Scale Analysis." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30871.

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There are several severe plastic deformation processes that transform the material from microsized grains to the nanosized grains under large deformations. The grain size of a macrostructure is generally 300 μm. Following severe plastic deformation it can be reached a grain size of 200 nm and even less up to 50 nm. These structures are called ultrafine grained materials with nanostructured organization of the grains. There are severe plastic deformation processes like equal angular channel, high pressure torsion which lead to a 200 nm grain size, respectively 100 nm grain size. Basically, these processes have a common point namely to act on the original sized material so that an extreme deformation to be produced. The severe plastic deformation processes developed until now are empirically-based and the modeling of them requires more understanding of how the materials deform. The macrostructural material models do not fit the behavior of the nanostructured materials exhibiting simultaneously high strength and ductility. The existent material laws need developments which consider multi-scale analysis. In this context, the present paper presents a laboratory method to obtain ultrafine grains of an aluminum alloy (Al-Mg) that allows the microstructure observations and furthermore the identification of the stress–strain response under loadings. The work is divided into (i) processing of the ultrafine-grained aluminum alloy using a laboratory-scale process named in-plane controlled multidirectional shearing process, (ii) crystallographic analysis of the obtained material structure, (iii) tensile testing of the ultrafine-grained aluminum specimens for obtaining the true stress-strain behavior. Thus, the microscale phenomena are explained with respect to the external loads applied to the aluminum alloy. The proposed multi-scale analysis gives an accurate prediction of the mechanical behavior of the ultrafine-grained materials that can be further applied to finite element modeling of the microforming processes.
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Reports on the topic "Size of deformations"

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Sarobol, Pylin, Michael E. Chandross, Jay Carroll, William Mook, Brad Boyce, Paul Gabriel Kotula, Bonnie Beth McKenzie, Daniel Charles Bufford, and Aaron Christopher Hall. Deformation Behavior of Sub-micron and Micron Sized Alumina Particles in Compression. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1159119.

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Koppenhoefer, K. C., and R. H. Jr Dodds. Size and deformation limits to maintain constraint in K{sub Ic} and J{sub c} testing of bend specimens. Office of Scientific and Technical Information (OSTI), October 1995. http://dx.doi.org/10.2172/132781.

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Czarnogorska, M., S. V. Samsonov, and D. White. Ground deformation at the aquistore CO2 storage site in Saskatchewan (Canada) measured by Radarsat-2 DInSar. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296826.

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Samsonov, S. V., D. White, and M. Craymer. Time series of ground deformation for the Aquistore CO2 storage site located in southeastern Saskatchewan and computed from five beams of Radarsat-2 data combined using the MSBAS methodology. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296143.

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STRESS RESPONSE AND INITIAL STIFFNESS OF SIDE PLATE CONNECTIONS TO WCFT COLUMNS. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.9.

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To study the mechanism of load transfer in double-side-plate connections between I-beams and wall-type concrete-filled steel tubular columns, a pseudo-static experiment and finite element analysis were conducted for two full-scaled specimens. The results revealed that the primary load was transmitted along an S-shaped path in the side plate, and the primary strain occurred in an X-shaped region between the left and right steel beam flanges. The shear force in the steel beam web was transmitted first to the side plate centre and then to the joint area, where the side plate, steel tube web, and concrete all resisted the internal force. Based on principal component methods, a calculation formula was established for initial rotational stiffness that comprehensively considers the influence of the tensions, compression, and shear deformation of the cover plate, side plate, and web. Comparing this formula with an existing model showed that the proposed formula is suitable for new types of side plate joints. Moreover, it can accurately calculate the initial rotational stiffness of the joint, thus providing a reliable basis for future engineering design.
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Estimates of hydraulic properties from a one-dimensional numerical model of vertical aquifer-system deformation, Lorenzi site, Las Vegas, Nevada. US Geological Survey, 2004. http://dx.doi.org/10.3133/wri034083.

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