Relevant bibliographies by topics / Large strain extrusion machining

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Large strain extrusion machining'

Author: Grafiati
Published: 9 March 2023

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Journal articles on the topic "Large strain extrusion machining"

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Gurusamy, Muralimohan, and Balkrishna C. Rao. "A Comprehensive Review of Large-Strain-Extrusion Machining Process for Production of Fine-Grained Materials." Crystals 13, no. 1 (January 11, 2023): 131. http://dx.doi.org/10.3390/cryst13010131.

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Bulk nanostructured metals and alloys are finding increasing structural applications due to their superior mechanical properties. The methods that rely on the severe plastic deformation technique for effecting microstructural refinement through imposing large strains are utilized mostly to produce nanostructured materials. The machining process has been demonstrated as a simple process for severe plastic deformation by imposing large strains through a single pass of the cutting tool where strains in a range of 1–15 can be imposed for a variety of materials by varying the cutting conditions and tool geometry. However, the geometry of the resulting chip subjected to severe plastic deformation during the machining process is not under control and, hence, a variant of the machining process, called the large-strain-extrusion machining process, has been proposed and utilized extensively for producing bulk nanostructured materials. Large-strain-extrusion machining possesses simultaneous control over microstructure refinement, through managing the strain during large-strain machining, and the shape and dimension of the resulting chip by the extrusion process. This study provides a comprehensive review of the large-strain-extrusion machining process by presenting the findings related to the utilization of this process for the production of fine-grained foils for various metals and alloys. Further research efforts related to finite-element modelling of large-strain-extrusion machining and their usefulness in designing the experimental setup and process conditions are also discussed.
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Moscoso, W., M. R. Shankar, J. B. Mann, W. D. Compton, and S. Chandrasekar. "Bulk nanostructured materials by large strain extrusion machining." Journal of Materials Research 22, no. 1 (January 2007): 201–5. http://dx.doi.org/10.1557/jmr.2007.0021.

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Large strain extrusion machining (LSEM) is presented as a method of severe plastic deformation for the creation of bulk nanostructured materials. This method combines inherent advantages afforded by large strain deformation in chip formation by machining, with simultaneous dimensional control of extrusion in a single step of deformation. Bulk nanostructured materials in the form of foils, plates, and bars of controlled dimensions are shown to result by appropriately controlling the geometric parameters of the deformation in large strain extrusion machining.
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Lin, Ping, Zi Chun Xie, and Qing Li. "Effect of the Friction Coefficient on Large Strain Extrusion Machining." Applied Mechanics and Materials 273 (January 2013): 138–42. http://dx.doi.org/10.4028/www.scientific.net/amm.273.138.

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The present study focused on the influence of the friction coefficient on the deformation behavior in large strain extrusion machining (LSEM). A series of simulation results of effective strain were obtained under different friction coefficients by conducting finite element simulations with a FEM code. The results show that LSEM can produce different effective strains by changing the friction coefficients, thus enabling the fabrication of bulk nanostructured materials. An analysis of the variation of effective strain through the chip demonstrated that the chip deformed much more inhomogeneously when the friction coefficient became larger. The obtained results can offer valuable guidelines for later LSEM studies.
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Deng, Wen Jun, Ping Lin, Zi Chun Xie, and Qing Li. "Analysis of Large-Strain Extrusion Machining with Different Chip Compression Ratios." Journal of Nanomaterials 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/851753.

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Large-Strain Extrusion Machining (LSEM) is a novel-introduced process for deforming materials to very high plastic strains to produce ultra-fine nanostructured materials. Before the technique can be exploited, it is important to understand the deformation behavior of the workpiece and its relationship to the machining parameters and friction conditions. This paper reports finite-element method (FEM) analysis of the LSEM process to understand the evolution of temperature field, effective strain, and strain rate under different chip compression ratios. The cutting and thrust forces are also analyzed with respect to time. The results show that LSEM can produce very high strains by changing in the value of chip compression ratio, thereby enabling the production of nanostructured materials. The shape of the chip produced by LSEM can also be geometrically well constrained.
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Bertolini, R., S. Bruschi, A. Ghiotti, L. Pezzato, and M. Dabalà. "Large strain extrusion machining of magnesium alloys for biomedical applications." Procedia CIRP 71 (2018): 105–10. http://dx.doi.org/10.1016/j.procir.2018.05.080.

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Cai, S. L., Y. Chen, G. G. Ye, M. Q. Jiang, H. Y. Wang, and L. H. Dai. "Characterization of the deformation field in large-strain extrusion machining." Journal of Materials Processing Technology 216 (February 2015): 48–58. http://dx.doi.org/10.1016/j.jmatprotec.2014.08.022.

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Sevier, M., H. T. Y. Yang, W. Moscoso, and S. Chandrasekar. "Analysis of Severe Plastic Deformation by Large Strain Extrusion Machining." Metallurgical and Materials Transactions A 39, no. 11 (August 7, 2008): 2645–55. http://dx.doi.org/10.1007/s11661-008-9608-0.

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Molafilabi, Sajad, Alireza Sadeghi, and Mohammadjafar Hadad. "Investigation of large strain extrusion machining (LSEM) of pure magnesium (Mg)." International Journal of Lightweight Materials and Manufacture 3, no. 2 (June 2020): 100–107. http://dx.doi.org/10.1016/j.ijlmm.2019.09.001.

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Deng, Wen Jun, Ping Lin, Qing Li, and Wei Xia. "Effect of Constraining Tool Corner Radius on Large Strain Extrusion Machining." Materials and Manufacturing Processes 28, no. 10 (October 3, 2013): 1090–94. http://dx.doi.org/10.1080/10426914.2013.811747.

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Moradi, Marzyeh, Saurabh Basu, and M. Ravi Shankar. "Creation of ultrafine-grained surfaces by large strain extrusion machining (LSEM)." Machining Science and Technology 21, no. 4 (July 10, 2017): 617–31. http://dx.doi.org/10.1080/10910344.2017.1336624.

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Dissertations / Theses on the topic "Large strain extrusion machining"

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(9027656), Jason Marion Davis. "Exploring the Role of Surface-Adsorbing Media in Cutting of Corrosion-Resistant Metals." Thesis, 2020.

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Tantalum, niobium, stainless steels, and nickel are corrosion-resistant metals that have become critical in many industrial sectors. Due to the demanding environments and temperatures in which they operate, few materials can serve as substitutes. The advantages of these materials are offset by the difficulties in their machining. Belonging to a group of metals and alloys often referred to as ‘gummy’, their poor machinability or gumminess is manifest as thick chip formation, large cutting forces, and poor finish on cut surface. Hence, machining costs can be prohibitive, and applications limited. The gumminess has been attributed broadly to their high strain-hardening capacity.

To examine why these metals are difficult to machine, we used direct in situ observations of the cutting process with a high-speed imaging system, complemented by force measurements. The observations showed that chip formation occurred by repeated large-amplitude folding of the material – sinuous flow – with vortex-like components and extensive redundant deformation. The folding was particularly severe in Ta and Nb. Although Ta and Nb displayed a higher rate of fold nucleation than the Ni and stainless steel, the flow dynamics underlying chip formation across the metals was the same – sinuous flow nucleated by a plastic (buckling-type) flow instability on the workpiece surface just ahead of the advancing tool. The large strains and energy dissipation associated with sinuous flow is the reason for the poor machinability of these metals.

Prior work with Cu and Al has shown that sinuous flow can be disrupted and replaced by an energetically more favorable (segmented) flow mode, characterized by quasi-periodic fracture, when suitable chemical media are applied to the initial workpiece surface – a mechanochemical effect. The segmented flow is beneficial for machining processes since it involves much smaller forces and plastic strains. It has been hypothesized that the chemical media influence the flow through their adsorption onto the workpiece surface, thereby altering the surface energy and/or surface stress, and effecting a local embrittlement (ductile-to-brittle transition).

We demonstrate similar media (mechanochemical) effects and segmented flow development in cutting of the corrosion-resistant metals, with significant benefits for their machining. These benefits include > 35 percent reduction in the cutting force/energy, and an order of magnitude improvement in cut surface quality (finish, tears and residual strain). Importantly, the experiments with the corrosion-resistant metals provide strong evidence that it is indeed adsorption – not corrosion, as in case of hydrogen embrittlement – that underpins the mechanochemical effect. The experiments used chemical agents well-known for their strong adsorption to metal surfaces, namely green corrosion inhibitors (e.g., plant extracts, propolis) and other natural organic molecules (e.g., dyes, antibacterial drugs, cow’s milk). Lastly, the suitability and application of the mechanochemical effect at industrial cutting speeds is explored in turning experiments with these corrosion-resistant metals. Collectively, our observations, measurements, and analysis show that the gumminess of metals in cutting is due to sinuous flow; the gumminess can be eliminated by use of chemical media; and adsorption is the key to engendering the mechanochemical effect. Implications of the results for industrial processes ranging from machining to particle comminution, and for sustainable manufacturing are discussed.


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Coates, Philip D., Philip D. Caton-Rose, Ian M. Ward, and Glen P. Thompson. "Process structuring of polymers by solid phase orientation processing." 2013. http://hdl.handle.net/10454/9638.

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Solid phase orientation of polymers is one of the most successful routes to enhancement of polymer properties. It unlocks the potential of molecular orientation for the achievement of a range of enhanced physical properties. We provide here an overview of techniques developed in our laboratories for structuring polymers by solid phase orientation processing routes, with a particular focus on die drawing, which have allowed control of significant enhancements of a single property or combinations of properties, including Young's modulus, strength, and density. These have led to notable commercial exploitations, and examples of load bearing low density materials and shape memory materials are discussed.
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Book chapters on the topic "Large strain extrusion machining"

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Bai, Xiaolong, Andrew Kustas, Srinivasan Chandrasekar, and Kevin Trumble. "Large Strain Extrusion Machining on 6013 Aluminum Alloy." In Light Metals 2016, 225–29. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48251-4_38.

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Bai, Xiaolong, Andrew Kustas, Srinivasan Chandrasekar, and Kevin Trumble. "Large Strain Extrusion Machining on 6013 Aluminum Alloy." In Light Metals 2016, 225–29. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274780.ch38.

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Klenosky, Daniel R., David R. Johnson, Srinivasan Chandrasekar, and Kevin P. Trumble. "Characterization of Large Strain Extrusion Machining (LSEM) of AA7050." In Light Metals 2017, 301–4. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51541-0_40.

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Swaminathan, Srinivasan, Srinivasan Chandrasekar, W. Dale Compton, Alexander H. King, and Kevin P. Trumble. "Large Strain Deformation of Single-Phase Copper Solid Solutions by Machining." In Materials Science Forum, 651–56. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-985-7.651.

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Sharma, Deepak, Kunal Arora, Vinod Kumar, and Vipin Kumar Sharma. "Study of mechanical and microstructural properties of titanium chips fabricated by large strain machining process." In Additive Manufacturing in Industry 4.0, 185–97. New York: CRC Press, 2022. http://dx.doi.org/10.1201/9781003360001-11.

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Kobayashi, Shiro, Soo-Ik Oh, and Taylan Altan. "Thermo-Viscoplastic Analysis." In Metal Forming and the Finite-Element Method. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195044027.003.0015.

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The main concern here is the analysis of plastic deformation processes in the warm and hot forming regimes. When deformation takes place at high temperatures, material properties can vary considerably with temperature. Heat is generated during a metal-forming process, and if dies are at a considerably lower temperature than the workpiece, the heat loss by conduction to the dies and by radiation and convection to the environment can result in severe temperature gradients within the workpiece. Thus, the consideration of temperature effects in the analysis of metal-forming problems is very important. Furthermore, at elevated temperatures, plastic deformation can induce phase transformations and alterations in grain structures that, in turn, can modify the flow stress of the workpiece material as well as other mechanical properties. Since materials at elevated temperatures are usually rate-sensitive, a complete analysis of hot forming requires two considerations—the effect of the rate-sensitivity of materials and the coupling of the metal flow and heat transfer analyses. A material behavior that exhibits rate sensitivity is called viscoplastic. A theory that deals with viscoplasticity was described in Chap. 4. It was shown that the governing equations for deformation of viscoplastic materials are formally identical to those of plastic materials, except that the effective stress is a function of strain, strain-rate, and temperature. The application of the finite-element method to the analysis of metal-forming processes using rigid-plastic materials leads to a simple extension of the method to rigid-viscoplastic materials. The importance of temperature calculations during a metal-forming process has been recognized for a long time. Until recently, the majority of the work had been based on procedures that uncouple the problem of heat transfer from the metal deformation problem. Several researchers have used the following approach. They determined the flow velocity fields in the problem either experimentally or by calculations, and they then used these fields to calculate heat generation. Examples of this approach are the works of Johnson and Kudo on extrusion, and of Tay et al. on machining. Another approach uses Bishop’s numerical method in which heat generation and transportation are considered to occur instantaneously for each time-step with conduction taking place during the time-step.
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Conference papers on the topic "Large strain extrusion machining"

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Kumar, Pushpinder, Ravinder Singh Joshi, and Rohit Kumar Singla. "Mechanical and Metallurgical Characterization of Ultrafine Grained Titanium Laminates Developed by LSEM." In ASME 2022 17th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/msec2022-85839.

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Abstract Titanium alloy sheets find its broad use in the automotive, biomedical, and aerospace industries. One of the most demanding role of these sheets is in making of Ti/GFRP based stacked composites. Production of Titanium laminates for this application is difficult and expensive than other metals due to the challenges of multipass processing with intermediate annealing. In the present research work, ultrafine titanium laminates are fabricated through novel technique based on large strain extrusion machining in a single pass. Laminates were produced from Ti-6Al-4V and pure titanium (CP-Ti). Metallurgical characterization through SEM/XRD/EBSD analysis is performed to check the effects of different parameters on laminates properties. Mechanical testing is performed using vicker’s hardness tester. It is evident from the analysis that the hardness of laminates is increased by 25–52% as compared to the base materials. Changes in crystallite structure of the material with severe plastic deformation may have led to an increase in hardness of laminates. Scanning electron microscopy is used to see the topography of the surface, and roughness is measured using a roughness tester. Deformation in different laminates was analysed through X-ray diffraction. Electron backscatter diffraction (EBSD) was done on the sample to find the crystallographic information of the microstructure of laminates fabricated by large strain extrusion machining.
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Salilkumar, Vandana A., and Narayan K. Sundaram. "On the Application of Arbitrary Lagrangian-Eulerian and Remeshing Techniques to Simulate Certain Machining and Deformation Processing Operations." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2957.

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Abstract Metal cutting and deformation processing operations provide some of the most challenging problems for modeling and simulation in computational plasticity. These challenges include, but are not limited to, extreme plastic deformation, challenges in constitutive and interfacial friction modeling, microstructural effects, mechanical and thermoplastic instabilities, multiphysics effects due to cutting fluid and high temperatures, and are generally computationally intensive. Despite considerable progress in each of these fronts, there is scope to expand the envelope of simulations that capture the deformation physics while being computationally feasible. Moreover, even conventional standard FEA codes can be leveraged for modeling and simulation in more effective ways. In this work, we present three challenging scenarios for modeling, namely large strain extrusion machining (LSEM), forming using a flat punch, and cutting of inhomogeneous metal, using a mix of Arbitrary Lagrangian Eulerian (ALE), conventional Lagrangian FE, and remeshing techniques. Some of these simulations are ‘standard’, while others are first-in-class, and we discuss both specific and general modeling issues that must be considered to obtain good quality solutions. Specific mechanics insights gleaned from each of these case studies are also presented, ranging from the influence of friction in deep punch indentation to the selection of the chip thickness ratio in LSEM. The last part of this work focuses on problems that arise in the simulation of polycrystalline aggregate cutting, and the progress made in addressing them.
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Mann, J. B., M. Saei, A. Udupa, B. Stiven Puentes-Rodriguez, and D. Sagapuram. "Applications of Machining in Materials Manufacturing." In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8491.

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Abstract The deformation conditions in machining of metals and alloys offer a unique route for materials processing with remarkable advantages over conventional deformation processes. The intense shear strain and high strain-rates in machining can be applied to form chips with controlled geometry. That is, the chip formation in machining can be used directly as a materials processing route wherein the chip becomes the product. The technical details for two of these processes — hybrid cutting-extrusion (HCE) and modulation-assisted machining (MAM) — are discussed and recent experimental results are presented. Both processes involve direct control of the shear-based deformation in machining. HCE applies an additional constraint in cutting which converts the otherwise uncontrolled chip thickness to a controlled format of specific size and shape. In HCE processing of sheet and strip, the deformed chip thickness is less than the deformed chip thickness in conventional cutting. The superimposed oscillation in MAM converts the otherwise continuous cutting process into a series of discrete cutting events. The control of the MAM and cutting conditions enable unique control of chip formation and the production of equiaxed, fiber, and platelet powder (particle) morphologies. The HCE and MAM processes demonstrate how chip control in machining can provide a route to applications opportunities in materials manufacturing.
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Jun, Huang, Wang Shulin, Liu Xu, and Sun Chunhua. "Experimental Research on Producing Nanostructured Materials by Machining Al6061-T6 with Large Strain." In 2010 International Conference on Electrical and Control Engineering (ICECE). IEEE, 2010. http://dx.doi.org/10.1109/icece.2010.240.

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Iglesias, P., M. D. Bermúdez, S. Chandrasekar, B. C. Rao, A. E. Jiménez, and T. Perdigón. "A Study of the Wear Behavior of Nanocrystalline Titanium Created by Large Strain Machining." In STLE/ASME 2006 International Joint Tribology Conference. ASME, 2006. http://dx.doi.org/10.1115/ijtc2006-12337.

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Lee, Seongeyl, Jihong Hwang, M. Ravi Shankar, Srinivasan Chandrasekar, and W. Dale Compton. "Velocity and Strain Distributions in Two-Dimensional Orthogonal Machining." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62433.

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A study has been made of the primary deformation zone and tool-chip interface in two-dimensional (plane strain) orthogonal machining of commercially pure metals. The use of a high-speed, Charge-Coupled Device (CCD) imaging system in conjunction with an optically transparent, sapphire cutting tool, has enabled characteristics of the deformation field such as velocity, strain, and material flow, to be obtained at high spatial and temporal resolution. The velocity distributions in the primary deformation zone and along the tool rake face have been obtained by applying a Particle Image Velocimetry (PIV) technique to sequences of high-speed images of the chip-tool interface taken through the transparent tool, and of the primary deformation zone recorded from a side of the workpiece. A procedure is presented and demonstrated for determining the strain and strain rate distributions in the primary deformation zone. The measurements have provided data about the variations of strain, strain rate and velocity, in and around the cutting edge and primary deformation zone; confirmed the existence of a region of retarded sliding in the region of intimate contact between tool and chip; and highlighted the occurrence of a region of dead metal ahead of the cutting edge when cutting with a negative rake angle tool. The implications of these results to the use of machining as a controlled test for studying very large strain deformation, and for estimating material properties under extreme conditions of deformation are discussed.
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Burkett, M. W. "Eulerian Hydrocode Modeling of a Dynamic Tensile Extrusion Experiment." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-057.

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Abstract Eulerian hydrocode simulations using the Mechanical Threshold Stress (MTS), Zerilli-Armstrong (Z-A), and Johnson Cook (J-C) flow stress models were performed to provide insights into dynamic tensile extrusion (DTE) experiments with copper (Cu) and tantalum (Ta). The extrusion of Cu and Ta projectiles was simulated with an explicit, two-dimensional Eulerian continuum mechanics hydrocode and compared with data to determine if this extrusion concept is a useful indirect hydrocode material strength model evaluation experiment. The data consisted of high-speed images of the extrusion process, photon Doppler velocimetry (PDV) to measure the projectile velocity history and die transit time, dynamic temperature measurements of the extruded material, recovered extruded samples, and post-test metallography. The hydrocode was developed to predict large-strain and high-strain-rate loading problems. The code features a high-order advection algorithm, material interface tracking scheme, and van Leer monotonic advection-limiting algorithm. The strength models were utilized to evolve the flow stress (σ) as a function of strain, strain rate, and temperature. Average strain rates on the order of 104 s−1 and plastic strains exceeding 300% were predicted in the extrusion of copper at impact velocities between 400–450 m/s, while plastic strains exceeding 800% were predicted for Ta. The predicted and measured deformation topologies, projectile velocity profiles and die transits times, plastic strains, and temperatures were qualitatively compared. The flow stress distributions predicted by the three strength models were also compared for one experiment. Finally, the feasibility of using DTE to evaluate hydrocode strength models will be discussed.
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Huang, Yong, and Mason Morehead. "Study of Machining-Induced Microstructure Variations of ECAE-Processed Ultrafine-Grained Copper." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84124.

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Various methods for production of bulk ultrafine-grained (UFG)/nanostructured materials have been developed. Recently, a top-down approach named equal channel angular extrusion (ECAE), a form of severe plastic deformation (SPD), has gained increasing attention in making bulk UFG materials. Such bulk materials are favored for their high strength, wear resistance, ductility, and high strain-rate superplasticity, which makes them suitable for light weight engineering and medical applications. Further precision machining work is normally indispensable for structural applications after bulk ultrafine grained materials are manufactured from any SPD processes. Unfortunately, the microstructure stability issues in precision machining such materials are frequently ignored. Using an ECAE copper bar as an example, this study has investigated its machining-induced workpiece microstructure variation. It has been found that there was a small increase in the size parameter median and the average arithmetic and area weighted grain sizes when comparing those of machined and unmachined bars, and the measured grain sizes oscillated slightly in the radial direction of the machined bar. Dislocation density was shown to have the most reduction at the outer radius location of the machined ECAE bar where more heat and/or higher pressure were experienced.
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Swaminathan, Srinivasan, M. Ravi Shankar, Balkrishna C. Rao, Travis L. Brown, Srinivasan Chandrasekar, W. Dale Compton, Alexander H. King, and Kevin P. Trumble. "Nanostructured Materials by Machining." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81242.

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Large strain deformation, a key parameter in microstructure refinement by Severe Plastic Deformation (SPD) processes, is a common feature of chip formation in machining. It is shown that the imposition of large plastic strains by chip formation can create metals and alloys with nanocrystalline or ultra-fine grained microstructures. The formation of such nanostructured materials is demonstrated in a wide variety of material systems including pure metals, light-weight aluminum alloys, and high strength steels and alloys. Nanocrystalline microstructures with different morphologies are demonstrated. The hardness and strength of the nanostructured chips are significantly greater than that of the bulk material. The production of nanostructured chips by machining, when combined with comminution and powder processing methods, may be expected to lead to the creation of a number of advanced materials with new and interesting combinations of properties. These materials are expected to find wide-ranging applications in the discrete products sector encompassing ground transportation, aerospace and bio-medical industries.
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Fortin, J., R. Fortier, and A. Gatien. "New Machining Method of Ice-Rich Permafrost Samples for Large Strain Thaw Consolidation Tests in an Oedometer." In 18th International Conference on Cold Regions Engineering and 8th Canadian Permafrost Conference. Reston, VA: American Society of Civil Engineers, 2019. http://dx.doi.org/10.1061/9780784482599.006.

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