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Academic literature on the topic 'Super Plastic Deformation'

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Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Super Plastic Deformation"

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Ragozin, Alexey, Dmitry Zedgenizov, Vladislav Shatsky, Konstantin Kuper, and Hiroyuki Kagi. "Deformation Features of Super-Deep Diamonds." Minerals 10, no. 1 (December 24, 2019): 18. http://dx.doi.org/10.3390/min10010018.

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The paper presents new data on the internal structure of super-deep (sublithospheric) diamonds from Saõ-Luiz river placers (Brazil) and from alluvial placers of the northeastern Siberian platform (Yakutia). The sublithospheric origin of these diamonds is supported by the presence of mineral inclusions corresponding to associations of the transition zone and lower mantle. The features of morphology and internal structure have been studied by optical and scanning electron microscopy (SEM), cathodoluminescence topography (CL), and electron backscatter diffraction (EBSD) techniques. Diamonds typically have complicated growth histories displaying alternating episodes of growth, dissolution, and post-growth deformation and crushing processes. Most crystals have endured both plastic and brittle deformation during the growth history. Abundant deformation and resorption/growth features suggest a highly dynamic growth environment for super-deep diamonds. High temperatures expected in the transition zone and lower mantle could explain the plastic deformations of super-deep diamonds with low nitrogen content.
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Hao, Y. L., S. J. Li, S. Y. Sun, C. Y. Zheng, Q. M. Hu, and R. Yang. "Super-elastic titanium alloy with unstable plastic deformation." Applied Physics Letters 87, no. 9 (August 29, 2005): 091906. http://dx.doi.org/10.1063/1.2037192.

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Ma, Chao Qun, Qi Qiang Duan, and Xiao Wu Li. "Plastic Deformation and Damage Behavior of AL6XN Super-Austenitic Stainless Steels." Advanced Materials Research 79-82 (August 2009): 1951–54. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1951.

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Tensile and compressive deformation and damage behaviors of Al6XN super-austenitic stainless steels were examined at different strain rates. The deformation and fracture surfaces were characterized by scanning electron microscopy (SEM). It was found that the uniaxial deformation (tensile or compressive) behaviors of Al6XN stainless steel shows a low strain rate sensitivity over the range of 10-4s-1 - 10-2s-1. The tensile and compressive yield strengths measured are nearly comparable. The steel shows a good tensile plasticity. Dislocation slip deformation is the main characteristic of uniaxial deformation. All fracture surfaces induced by tensile deformation at different strain rates can be divided into two parts, i.e., fibrous zone and shear lip zone. The fibrous zone consists of dimples with a bimodal size.
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Sun, Jian Hua, Hai Gu, and Guo Ding Yuan. "Super Plastic Deformation Behavior of the Commonly as-Extruded Mg-3Zn-1Al Magnesium Alloy." Advanced Materials Research 798-799 (September 2013): 79–82. http://dx.doi.org/10.4028/www.scientific.net/amr.798-799.79.

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Super plastic behavior of the commonly as-extruded Mg-3Zn-1Al (ZA31) magnesium alloy is investigated at temperatures ranging from 593 to 623K and strain rates ranging from 8×10-5 to 10-3s-1. The results show that the alloy exhibits excellent super plasticity and the maximum elongation-to-failure reaches 220.4%. The alloy also shows a high strain rate sensitivity exponent of 0.38. Microstructure observations suggest that grain boundary sliding (GBS) with cavity coordination makes a substantial contribution to the super plastic deformation.
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Hua, Ding, Wu Qingling, and Ma Longxiang. "Deformation behaviour in α/β two-phase super-plastic brass." Journal of Materials Science 27, no. 3 (February 1992): 607–10. http://dx.doi.org/10.1007/bf02403867.

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Lukasiewicz, S. A. "Geometrical super-elements for elasto-plastic shells with large deformation." Finite Elements in Analysis and Design 3, no. 3 (October 1987): 199–211. http://dx.doi.org/10.1016/0168-874x(87)90024-2.

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Hua, Ding, Wu Qingling, and Ma Longxiang. "Deformation behaviour in α/β two-phase super-plastic brass." Journal of Materials Science 27, no. 3 (January 1992): 607–10. http://dx.doi.org/10.1007/bf00554024.

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Гадалов, Владимир, Vladimir Gadalov, Ирина Ворначева, Irina Vornacheva, Александр Филонович, Alexander Filonovich, Александр Чернышев, and Aleksandr Chernyshev. "Thermo-cycling impact upon velocity choice of titanium alloy super-plastic flow." Science intensive technologies in mechanical engineering 2019, no. 10 (October 29, 2019): 19–25. http://dx.doi.org/10.30987/article_5d6518cd691f02.33724732.

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The modes of the thermo-cyclical deformation of pseudo-α alloys having the super-plastic deformation state under isothermal conditions at temperatures in the field of two-phase state are investigated. The modes for preliminary thermo-processing influencing processing characteristics of VT20 and OT$ alloys, that is, increasing a deformation temperature interval and decreasing processing time are determined.
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Li, Ying Jie, Xiu Zhi Zhang, and Feng Li. "Study on the Super-Plastic Property of ECAPed Magmesium Alloy." Advanced Materials Research 311-313 (August 2011): 640–43. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.640.

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In this paper, the influence of temperature and strain rate on the superplastic deformation behaviors of the Mg-Zn-Nd alloy has been investigated through performing tensile tests at different temperatures and strain rates. After 4 passes of ECAP by route C, the strain-rate sensitivity coefficients reached 0.32 at 300°C, indicating that the ECAPed Mg-Zn-Nd alloy exhibited a good superplasticity at lower temperature. The results of flow activation energy showed that the super-plastic deformation mechanism of magnesium alloys is grain-boundary sliding controlled by grain boundary diffusion.
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Wang, Jun, Guang Lan Liao, Qiang Yu, and Tie Lin Shi. "Oxidation Behavior in Super-Plastic Microforming of Zr65Cu17.5Ni10Al7.5 Bulk Metallic Glass." Applied Mechanics and Materials 117-119 (October 2011): 1377–82. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.1377.

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The influence of oxidation behavior on super-plastic microforming of bulk metallic glass Zr65Cu17.5Ni10Al7.5in the super-cooled liquid region was investigated. Samples were heated in air from room temperature to 395°C, 410°C, and 430°C, respectively, and kept under each temperature for 40 minutes. The increased weight of samples and the thickness of oxide layer were measured. Subsequently, the sample was compressed under 410°C with a micro gear silicon mold. In result, the oxide layer of the gear cracked and could be easily removed; also, the X-ray diffractometer showed that the gear core below the oxide layer remained an amorphous structure. It can be concluded that the oxidation behavior of Zr65Cu17.5Ni10Al7.5does not affect the super-plastic deformation, which indicates the feasibility of super-plastic microforming process in air.
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Dissertations / Theses on the topic "Super Plastic Deformation"

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Bommareddy, Aravinda Reddy Materials Science &amp Engineering Faculty of Science UNSW. "Thermal stability of submicron grain structure in an Al-Sc alloy." Publisher:University of New South Wales. Materials Science & Engineering, 2008. http://handle.unsw.edu.au/1959.4/41492.

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Severe plastic deformation (SPD) has been used over the past few decades for producing submicron grain (SMG) structures in range of metals and alloys. Equal channel angular pressing (ECAP) is a useful process for producing these types of structures whereby the material is deformed to very high plastic strains by passing a billet several times through the ECAP die. This process has an added advantage maintaining the initial dimensions of the billet. SMG materials produced by ECAP and related routes are useful as they usually exhibit excellent properties including high strength and hardness, and excellent superplastic formability: these and other properties make SMG materials useful for industrial and aerospace applications. In this thesis, a binary aluminium alloy containing a very low concentration of scandium (0.1 wt. %) Sc alloy was investigated and compared with higher Sc-containing alloys. The material was deformed by ECAP in the solution treated condition to an equivalent von Mises strain of 9.2 then pre-aged at 250 0C to generate a submicron grained material containing a relatively uniform dispersion of nanosized Al3Sc dispersiods. The thermal stability of this pre-aged microstructure was investigated by annealing at temperatures up to 450 0C resulted in continuous grain coarsening by the process of continuous recrystallization whereby the initial microstructure evolves gradually with no marked change in the grain size distribution, texture and grain boundary character. However, extended annealing (> 1h) at 4500 C resulted in discontinuous grain coarsening (often termed recrystallization) whereby a few grains grow rapidly to eventually produce a coarse-grained final microstructure. Throughout annealing, there was a good correlation between the dispersion parameter, (f/d) where f and d is the volume fraction and the mean diameter of Al3Sc particles in the alloy, respectively, and both the mean grain size (D ) and D /D max where max D is the maximum grain diameter observed in the microstructure. The grain structure was found to undergo moderate coarsening at the high f/d-values but converted to a coarsegrained structure for f/d ~<0.5/μm, and this change occurred when the mean grain diameter was ~ 3-4μm. Hence, the critical value of the dispersion parameter for the transition from continuous to discontinuous coarsening falls between the theoretical value for submicron grain size alloys (f/d ~ 1.5/μm) and the value found for conventionally-deformed alloys (f/d ~ 0.1/μm). This behaviour is the result of the alloy no longer being ultra-fine grained at the onset of discontinuous coarsening.
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Thuramalla, Naveen. "Multiscale modeling and analysis of failure and stability during super plastic deformation -- under different loading conditions." Lexington, Ky. : [University of Kentucky Libraries], 2004. http://lib.uky.edu/ETD/ukymeen2004t00171/NAVEEN.pdf.

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Thesis (m.s.)--University of Kentucky, 2004.
Title from document title page (viewed Jan. 5, 2005). Document formatted into pages; contains x, 112p. : ill. Includes abstract and vita. Includes bibliographical references.
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Sousa, S?rgio Barros de. "Desenvolvimento de um prot?tipo para an?lise din?mica da dureza de superf?cies met?licas." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12723.

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Made available in DSpace on 2014-12-17T14:06:59Z (GMT). No. of bitstreams: 1 SergioBS_DISSERT.pdf: 2441407 bytes, checksum: dc40986905dcf52b4a6c2c3e2499b479 (MD5) Previous issue date: 2010-03-30
In this paper we developed a prototype for dynamic and quantitative analysis of the hardness of metal surfaces by penetration tests. It consists of a micro-indenter which is driven by a gear system driven by three-rectified. The sample to be tested is placed on a table that contains a load cell that measures the deformation in the sample during the penetration of micro-indenter. With this prototype it is possible to measure the elastic deformation of the material obtained by calculating the depth of penetration in the sample from the difference of turns between the start of load application to the application of the load test and return the indenter until the complete termination of load application. To determine the hardness was used to measure the depth of plastic deformation. We used 7 types of steel trade to test the apparatus. There was a dispersion of less than 10% for five measurements made on each sample and a good agreement with the values of firmness provided by the manufacturers.
Nesse trabalho ? desenvolvido um prot?tipo para an?lise din?mica e quantitativa da dureza de superf?cies met?licas atrav?s de ensaios de penetra??o. Ele consiste de um micro-penetrador que ? movimentado por um sistema de engrenagens guiado por tr?s pinos retificados. A amostra a ser ensaiada ? colocada sobre uma mesa que cont?m uma c?lula de carga que mede a deforma??o na amostra durante a penetra??o do micro-penetrador. Com esse prot?tipo ? poss?vel medir a deforma??o el?stica do material obtida pelo c?lculo, atrav?s de software, da profundidade da penetra??o na amostra a partir da diferen?a de voltas entre o in?cio de aplica??o de carga at? a aplica??o total da carga de teste e o retorno do indentador at? a completa finaliza??o da aplica??o de carga. Para determina??o da dureza foi utilizada a medida da profundidade de deforma??o pl?stica. Foram utilizados 07 tipos de a?os comerciais para teste do aparato. Verificou-se uma dispers?o inferior a 10% para cinco medi??es efetuadas em cada amostra e uma boa concord?ncia com os valores de dureza fornecidos pelos fabricantes.
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Book chapters on the topic "Super Plastic Deformation"

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Elhoud, A., N. Renton, and W. Deans. "Hydrogen Embrittlement Enhanced by Plastic Deformation of Super Duplex Stainless Steel." In Damage and Fracture Mechanics, 59–67. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2669-9_7.

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"Super-Elongation." In Elastic and Plastic Deformation of Carbon Nanotubes, 125–38. Jenny Stanford Publishing, 2013. http://dx.doi.org/10.1201/b15420-10.

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Nygren, Mats, and Zhijian Shen. "ELECTRICAL FIELD ENHANCEMENT OF COMPACTION AND SUPER-PLASTIC DEFORMATION OF CERAMICS." In Novel Materials Processing by Advanced Electromagnetic Energy Sources, 267–73. Elsevier, 2005. http://dx.doi.org/10.1016/b978-008044504-5/50055-6.

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Sharma, Sanjay, Gurmeet Singh Cheema, Sahib Sartaj Singh, and Deepak Verma. "Improvement of Mechanical Properties and Morphological Studies of Friction Stir Processed Composites." In Design and Optimization of Mechanical Engineering Products, 152–79. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3401-3.ch008.

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Friction-stir processing (FSP) is a property enhancement technique which, not only removes the defects of initial casting process, but also improves the microstructure of the metals and metal matrix composites (MMCs). The process is based on frictional heating which results in a considerable dynamic plastic deformation within the metals. FSP can be specifically applied to develop fine-grained microstructures throughout the thickness of metal surface, to impart super plasticity and ensure homogeneous distribution of reinforced particles, if any. This chapter is a dedicated effort to consolidate the latest developments contributed by different researchers in last few years. The work covers various components and parameters, selected and used, for FSP to obtain specific desired results. Also, it includes past researches to exhibit various changes in mechanical properties with a keen focus on morphological study (by scanning electron microscopy) of these MMCs. In the last, a brief discussion on application and future scope of FSP processed MMC materials, is presented.
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Conference papers on the topic "Super Plastic Deformation"

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An, Bai, Takashi Iijima, Chris San Marchi, and Brian Somerday. "Micromechanisms of Hydrogen-Assisted Cracking in Super Duplex Stainless Steel Investigated by Scanning Probe Microscopy." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28181.

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Understanding the micromechanisms of hydrogen-assisted fracture in multiphase metals is of great scientific and engineering importance. By using a combination of scanning electron microscopy (SEM), scanning tunneling microscopy (STM), atomic force microscopy (AFM) and magnetic force microscopy (MFM), the micromorphology of fracture surface and microcrack formation in hydrogen-precharged super duplex stainless steel 2507 are characterized from microscale to nanoscale. The results reveal that the fracture surfaces consist of quasi-brittle facets with riverlike patterns at the microscale, which exhibit rough irregular patterns or remarkable quasi-periodic corrugation patterns at the nanoscale that can be correlated with highly localized plastic deformation. The microcracks preferentially initiate and propagate in ferrite phase and are stopped or deflected by the boundaries of the austenite phase. The hydrogen-assisted cracking mechanisms in super duplex stainless steel are discussed according to the experimental results and hydrogen-enhanced localized plasticity theory.
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Padisala, S. K., A. Bhardwaj, K. Poluri, and A. K. Gupta. "Effect of Constrained Groove Pressing on Mechanical Properties of Nitinol Alloy." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87295.

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Nitinol shape memory alloy is well known for its shape memory effect and super elastic effect. In the present work, the improvement of mechanical properties of nitinol alloy like yield strength, ultimate tensile strength and micro-hardness is discussed along with the study of evolution of micro-structure after every pass to extend the applications of shape memory alloys into high strength application areas. Severe plastic deformation processes are usually adopted for producing fine grain structures which improve the mechanical properties of a material. One such severe deformation process is constrained groove pressing, which is considered as one of the best severe plastic deformation techniques for sheet metals. The results of constrained groove pressing process on nitinol alloy show that the yield strength and the ultimate tensile strength have increased by about 3.6 times 2.5 times respectively, with an increment of 50% and 74% in micro-hardness after 1st pass of constrained groove pressing and 2nd pass of constrained groove pressing respectively. Microstructure shows increase in martensitic phase after constrained groove pressing processing. Increasing in twinning and grain boundary density can be observed in constrained groove pressing processed nitinol, which are the reasons for the tremendous increase in the strength of the alloy. Thus, the constrained groove pressing process on nitinol alloy can increase its range of application for high strength requirements.
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Kumar, V. S. Senthil, C. Ezilarasan, and A. Velayudham. "Acoustic Emission Based Tool Wear Condition Monitoring While Turning Nimonic C-263 Alloy Using PVD Coated Carbide Insert." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64246.

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Due to its ability to resist thermal fatigue and creep resistance at higher temperature, nimonic C-263 super alloy is frequently applied in the hot combustion chamber of gas turbines. By virtue of the above they induce tool wear while machining which seriously affect the life of the component, and it is a serious concern, since it is used in critical applications. To monitor the status of the tool condition, several sensors are utilised, of which acoustic emission is most widely used due to its nature of generation phenomenon. In this paper PVD coated carbide insert is utilised to conduct tool wear study through turning of nimonic C-263 super alloy. The experiments were performed at different combinations of cutting conditions. The life of the cutting tool at different cutting conditions and the tool wear mechanisms were analysed. Results revealed that acoustic signal predict the condition well and that cutting velocity play a major role in the tool wear progression. Abrasion, micro chipping and plastic deformation are observed to be the major tool wear mechanisms.
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Yu, Kuahai, Danesh Tafti, Xi Yang, and Shihong Xin. "Heat Transfer During Impact of Elastoplastic and Cohesive Particles." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91087.

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Abstract This paper presents a theoretical study of the heat transfer during particles colliding with a surface considering the material elastoplastic properties and adhesion forces of particles. The model divides the impact processes into three stages, the elastic stage, the elastic-plastic stage, and full plastic stage, and assumes that the recovery stage is fully elastic. The rebound velocities of particles are obtained by the comparison of initial kinetic energy and total energy losses, and the major loss mechanisms in the form of adhesion forces and plastic deformation of particles. During each stage of the collision, the impact duration of collision is predicted numerically by integrating the differential equations of contact forces and particle motion. Elastic impact duration and heat transfer of a 4.76 mm stainless steel particle with 304 stainless steel surface agrees well with a previous analytical model. The result shows that at higher impact velocity, a larger percentage of time is spent in the compression stage. Sand particles under 50 μm impacting a nickel based super alloy surface (DD3) from room temperature to 1273 K are evaluated. Time duration decreases with an increase in impact velocity and a decrease in particle size. Heat transfer at particle impact is determined primarily by the contact area and time duration, besides the temperature difference and thermal conductivity. Heat transfer of plastic impact is noticeably smaller than the Sun and Chen’s analytical model, and the difference increases with increase in impact velocity. Adhesion forces affect the time duration significantly at low impact velocity. Heat transfer for 20 μm sand particles at 1073 K, 1173 K and 1273 K is about 1.12, 1.15 and 1.25 times that at room temperature, and about 1.07, 1.08 and 1.15 times the impact duration at room temperature.
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Ding, Hongtao, and Yung C. Shin. "Dislocation Density-Based Grain Refinement Modeling of Orthogonal Cutting of Commercially Pure Titanium." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50220.

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Recently, machining has been exploited as a means for producing ultra-fine grained (UFG) and nanocrystalline microstructures for various metal materials, such as aluminum alloys, copper, stainless steel, titanium and nickel-based super alloys, etc. However, no predictive, analytical or numerical work has ever been presented to quantitatively predict the change of grain sizes during machining. In this paper, a dislocation density-based viscoplastic model is adapted for modeling the grain size refinement mechanism during machining by means of a finite element based numerical framework. A novel Coupled Eulerian-Lagrangian (CEL) finite element model embedded with the dislocation density subroutine is developed to model the severe plastic deformation and grain refinement during a steady-state cutting process. The orthogonal cutting tests of a commercially pure titanium (CP Ti) material are simulated in order to assess the validity of the numerical solution through comparison with experiments. The dislocation density-based material model is calibrated to reproduce the observed material constitutive mechanical behavior of CP Ti under various strains, strain rates and temperatures in the cutting process. It is shown that the developed model captures the essential features of the material mechanical behavior and predicts a grain size of 100–160 nm in the chips of CP Ti at a cutting speed of 10 mm/s.
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Jiao, Rong, and Stelios Kyriakides. "Ratcheting, Wrinkling and Collapse of Tubes Induced by Axial Cycling Under Internal Pressure." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49706.

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A buried offshore pipeline is essentially axially constrained by the soil cover. Heating by the passage of hot oil at high pressure can plastically deform it. The deformation involves expansion of the diameter, which for thinner pipes can be accompanied by axisymmetric wrinkling. During a lifetime of 20 or more years, lines experience regular startup and shutdown cycles. This study examines how this cycling affects wrinkling and the hoop expansion of such lines. A set of experiments on super-duplex tubes with D/t of 28.5 was conducted using the following idealized cyclic loading history. A tube is first pressurized and then compressed into the plastic range to a level that initiates wrinkling. It is then cycled under stress control about a compressive mean stress while the pressure is kept constant. The combined loads cause simultaneous ratcheting in the hoop and axial directions as well as a gradual growth of the wrinkles. At some stage the amplitude of the wrinkles starts to grow exponentially with the number of cycles N leading to localization and collapse. The rate of ratcheting and the number of cycles to failure depend on the initial compressive pre-strain, the internal pressure and the stress cycle parameters. The problem is modeled as a shell with initial axisymmetric imperfections. A challenge in the simulations is that the cyclic plasticity model that is used must be capable of capturing correctly the type of biaxial material ratcheting that develops. The Dafalias-Popov two-surface nonlinear kinematic hardening model, enhanced and suitably calibrated is shown to capture the prevalent ratcheting deformations correctly leading to predictions that are in good agreement with the experimental results. The model is then used to evaluate the ratcheting behavior of pipes under thermal-pressure cyclic loading histories seen by buried pipelines.
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Shrestha, Deepika, Fardad Azarmi, and X. W. Tangpong. "Effect of Heat Treatment on Residual Stress of Cold Sprayed Nickel-Base Superalloys." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0197.

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Abstract Residual stress can be developed in most thermally sprayed coatings due to the momentum of molten particles during impact; and heat transfer during solidification of the splats. Another reason for residual stress built-up in thermally sprayed coatings is due to splat curl-up during solidification and the differences in thermal expansion coefficients between the coating and the substrate. However; in the cold spraying process; it is believed that the main reason for residual stress formation is plastic deformation during impact and flattening of solid particles. Residual stresses can drastically influence coating quality and reduce its service time. In this study; residual stress is measured for two well-known nickel based super alloys (Inconel 625 and Inconel 718) deposited on 7074 aluminum alloy substrates by the cold spraying technique. Residual stress in Inconel 625 was found to be highly tensile on the surface and compressive on the subsurfaces. After heat treatment the residual stress was relieved and was compressive in nature. Whereas for Inconel 718; residual stress was compressive on the surface and tensile on the subsurfaces in the as-sprayed condition. After heat treatment; the residual stress was compressive with increased magnitude. The heat treatment at 800°C made the residual stress more compressive. The porosities of both Inconel 625 and Inconel 718 were reduced after heat treatment.
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Youssef, Sawsen, Olivier Calonne, and Hédi Hamdi. "Influence of Hand Disc Grinding on Surface Integrity of Nickel-Based Alloys: Numerical Approach." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97974.

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For complex part geometry, hand grinding is one of finishing and super finishing process the most used in mechanical industry. Surface integrity is today one major concern for industrials. The surface integrity is defined by a set of important characteristics of ground surface as surface geometric parameters (roughness, …), mechanical behaviour of the subsurface (hardness, residual stress, …) and structural changes of the material in the near surface. High heat and pressure, high strain and strain rate observed during hand grinding process, strongly influence surface integrity. Therefore, the surface behaviour, in terms of resistance to corrosion and crack initiation depends on how the process was conducted. The purpose of this study is to understand the effects of thermal and mechanical plastic deformation induced on the surface of components. The action of the disc-grinding wheel on the workpiece is modelled by a moving heat flux on the surface. The challenge is to be able to find the shape and intensity of thermomechanical load entering the workpiece in accordance with the hand disc grinding process and taking into account specific parameters of the process. In a first part, a mechanical description of the action of the disc-wheel on the surface is proposed in order to develop an analytic formulation of the grinding power and the heat flux density. They are function of the disc-grinding wheel velocity, the feed speed and the applied forces. This expression is then used in a finite element modelling to perform thermomechanical simulations of the hand disc-grinding process. In a first stage, heating and cooling are computed. They give maximum temperature reached, temperature gradients and cooling kinematic. In a second stage, thermomechanical computation is conducted in order to compute residual stresses induced by this abrasion process. A discussion based on experimental results obtained by XRD method is then proposed and some local explanation are given on the way the material structure has changed leading to a structural hardening in the 50 first microns beneath the ground surface.
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