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Journal articles on the topic 'Plastic slip'

Author: Grafiati

Published: 13 July 2024

Last updated: 31 July 2025

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1

Kawano, Yoshiki, Tsuyoshi Mayama, Ryouji Kondou та Tetsuya Ohashi. "Crystal Plasticity Analysis of Change in Active Slip Systems of α-Phase of Ti-6Al-4V Alloy under Cyclic Loading". Key Engineering Materials 725 (грудень 2016): 183–88. http://dx.doi.org/10.4028/www.scientific.net/kem.725.183.

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In this paper, we investigated changes in active slip systems of α-phase of Ti-6Al-4V alloy under a cyclic plastic loading using a crystal plasticity finite element method. In the analyses, a bicrystal model was employed, and the crystallographic orientations were set so as that prismatic <a> or basal slip system was the primary slip system in each grain. The results showed that there was a mechanism where the basal slip systems could reach the stage of activation under the cyclic plastic loading even though the condition was that the prismatic <a> slips initially operate. The reas

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2

Zhu, Xiao Hua, Yu Wang, Fu Cheng Deng, Li Ping Tang, and Hua Tong. "Optimal Design of Slip Dog Based on the Elasticoplasticity Contact Analysis." Applied Mechanics and Materials 34-35 (October 2010): 1718–23. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1718.

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Based on the elasticoplasticity contact analysis theory, a mechanical model for the whole process of the slip holding fast to the drilling pipe is established and a complete method is proposed to assess the performance of slip dog's structural parameters. For drilling pipe systems of different specifications, the coupling effect among tooth anterior corner, posterior corner, tooth height, tooth spacing of slip dog and the effect of the parameter variation on both the drilling pipe and itself after the slips hold fast to the drilling pipe are analyzed, and the slip dog's plastic damage law on t

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3

Yokogawa, Toshiya, Sachi Niki, Junko Maekawa, Masahiko Aoki, and Masaki Fujikane. "Dislocation Formation via an r-Plane Slip Initiated by Plastic Deformation during Nano-Indentation of a High Quality Bulk GaN Surface." MRS Advances 1, no. 58 (2016): 3847–52. http://dx.doi.org/10.1557/adv.2016.165.

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ABSTRACTBulk GaN substrates are of significant interest because they offer both high quality and low dislocation densities. Our group has previously reported the formation and movement of dislocations in high quality bulk GaN in response to nano-indentation. We have also proposed a mechanism involving an r-plane (-1012) slip initiated by plastic deformation during a pop-in event, a theory that was supported by molecular dynamics simulations. Herein, we present experimental evidence for this r-plane (-1012) slip mechanism in an indented GaN surface using nano-indentation with an indenter having

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4

Zhu, Eryu, Teng Li, Haoran Liu, et al. "Bond-Slip Behavior between Plastic Bellow and Concrete." Advances in Materials Science and Engineering 2022 (June 14, 2022): 1–16. http://dx.doi.org/10.1155/2022/2450503.

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Despite the widespread use of plastic bellows in prestressed channels, their poor bonding with concrete and mortar results in “layering,” which limits their application in practical engineering. In this study, the bonding property between plastic bellows and concrete or grout material was investigated using a single-end compression test on plastic bellow concrete. The slip failure mode, ultimate load, and slip of plastic bellows were obtained. Furthermore, the analysis of the bond-slip properties of plastic bellows indicated that the bond strength decreased with increasing bond length. Moreove

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5

POP, ELENA ANGELA. "STUDIES ON THE THEORY OF SLIP-LINES TO PLASTIC DEFORMATION." Scientific Bulletin Series D : Mining, Mineral Processing, Non-Ferrous Metallurgy, Geology and Environmental Engineering 38, no. 2 (2024): 57–61. https://doi.org/10.37193/sbsd.2024.2.07.

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The paper presents a theoretical and experimental study regarding the evolution of slip lines during the plastic deformation of metallic materials. The slip lines theory provides a description of a structural deformation, produced by plastic distortions in narrow slip bands. Numerical experiments are in agreement with classical solutions of slip field theory as it allows the development of slip bands as the boundary conditions are varied.

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6

Liu, Yun Xi, Wei Chen, Zhi Qiang Li, Liang Liang Liu та Dong Liu. "In Situ Observation on the Deformation Behavior of Primary α-Ti in a Textured Ti-6Al-4V". Materials Science Forum 993 (травень 2020): 365–73. http://dx.doi.org/10.4028/www.scientific.net/msf.993.365.

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The tensile deformation process and dislocation behavior of primary α-Ti of Ti-6Al-4V were studied by the in-situ tensile test combined with EBSD (electron backscatter diffraction). The initiation, evolution and distribution of dislocation slips at different strains were discussed. The results showed that the microtexture of the material had a significant influence on slip behavior. Typically, basal and prismatic <a> slips initiated first, but the dominant slip type was related to the local texture characteristics. Sometimes, the basal and prismatic <a> slips could still initiate w

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7

Ohashi, Tetsuya, Michihiro Sato, and Yuhki Shimazu. "Evaluation of Plastic Work Density, Strain Energy and Slip Multiplication Intensity at Some Typical Grain Boundary Triple Junctions." Materials Science Forum 654-656 (June 2010): 1283–86. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.1283.

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Plastic slip deformations of tricrystals with simplified geometries are numerically analyzed by a FEA-based crystal plasticity code. Accumulation of geometrically necessary (GN) dislocations, distributions of the total slip, plastic work density and GN dislocations on slip systems, as well as some indices for the intensity of slip multiplication are evaluated. Results show that coexistence of GN dislocations on different slip systems is prominent at triple junctions of grain boundaries.

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8

Gerdeen, J. C., W. W. Predebon, P. M. Schwab, and A. Shah. "Elastic-Plastic Analysis of Directionally Solidified Lamellar Eutectic Composites." Journal of Engineering Materials and Technology 109, no. 1 (1987): 53–58. http://dx.doi.org/10.1115/1.3225933.

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Yielding in a crystal structure occurs with plastic slip on preferential planes. It is similar to yielding on maximum shear planes in an isotropic continuum, but in this case the slip is anisotropic. The anisotropic slip is described by 24 piecewise, continuous yield functions, also known as the generalized Schmid’s law for FCC crystals. The plastic strain increment for any one slip mechanism is assumed given by the potential flow law of plasticity. However, there are combined slip situations where two or more slip mechanisms are activated simultaneously. In this paper, the plastic strains for

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9

Ando, Shinji, Masayuki Tsushida, and Hiromoto Kitahara. "Plastic Deformation Behavior in Magnesium Alloy Single Crystals." Materials Science Forum 706-709 (January 2012): 1122–27. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1122.

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Zn and Al are major alloying elements of Mg alloys. Main slip system of Mg is a basal slip and the CRSS increases with Zn or Al content. According to von-Mises criterion, five kinds of independent slip systems are required for uniform deformation, so it is necessary to activate non-basal slip systems to show good ductility. However, it has not become clear the effect of Zn or Al for non-basal slip systems yet. To investigate deformation behavior of magnesium crystal by non-basal slip, Mg-Zn and Mg-Al single crystals were stretched in the [110] direction and Mg-Zn single crystals were compresse

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10

Liu, Conghui, Rhys Thomas, João Quinta da Fonseca, and Michael Preuss. "Early slip activity and fatigue crack initiation of a near alpha titanium alloy." MATEC Web of Conferences 321 (2020): 11040. http://dx.doi.org/10.1051/matecconf/202032111040.

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For titanium alloys, crack initiation as a result of plastic strain accumulation has been shown to govern fatigue life under the high cycle fatigue regime. In this study, the early plastic slip activity and fatigue crack initiation was studied using a cyclic four point bending test at 10 Hz with a load ratio of 0.1, up to 90% of the proof stress. The plastic slip in the high stress area was monitored by interrupting the test and performing optical microscopy. Following fatigue crack initiation, scanning electron microscopy (SEM) combined with electron backscatter diffraction (EBSD) was used to

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11

Anguige, Keith, and Patrick W. Dondl. "Relaxation of the Non-Convex, Incremental Energy-Minimization Problem in Single-Slip Strain-Gradient Plasticity." Key Engineering Materials 651-653 (July 2015): 963–68. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.963.

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We consider a variational formulation of gradient elasto-plasticity, as they arise in the incremental formulation of the plastic evolution problem, subject to a class of single-slip side conditions. Such side conditions typically render the associated boundary-value problems non-convex. We first show that, for a large class of plastic deformations, a given single-slip condition (specification of Burgers' vectors and slip planes) can be relaxed by introducing a lamination microstructure. This yields a relaxed side condition which allows for arbitrary slip in a prescribed family of slip planes.

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12

Ortiz, M. "Plastic Yielding as a Phase Transition." Journal of Applied Mechanics 66, no. 2 (1999): 289–98. http://dx.doi.org/10.1115/1.2791048.

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A statistical mechanical theory of forest hardening is developed in which yielding arises as a phase transition. For simplicity, we consider the case of a single dislocation loop moving on a slip plane through randomly distributed forest dislocations, which we treat as point obstacles. The occurrence of slip at the sites occupied by these obstacles is assumed to require the expenditure of a certain amount of work commensurate with the strength of the obstacle. The case of obstacles of infinite strength is treated in detail. We show that the behavior of the dislocation loop as it sweeps the sli

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13

Huang, Houxu, Jie Li, and Jiuqi Wei. "Analytical Solution of Displacements Around Circular Openings in Generalized Hoek-Brown Rocks." Journal of Theoretical and Applied Mechanics 47, no. 3 (2017): 81–95. http://dx.doi.org/10.1515/jtam-2017-0015.

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AbstractThe rock in plastic region is divided into numbers of elements by the slip lines, resulted from shear localization. During the deformation process, the elements will slip along the slip lines and the displacement field is discontinuous. Slip lines around circular opening in isotropic rock, subjected to hydrostatic stress are described by the logarithmic spirals. Deformation of the plastic region is mainly attributed to the slippage. Relationship between the shear stresses and slippage on slip lines is presented, based on the study of Revuzhenko and Shemyakin. Relations between slippage

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14

Sung, T. H., J. C. Huang, J. H. Hsu, S. R. Jian, and T. G. Nieh. "Yielding and plastic slip in ZnO." Applied Physics Letters 100, no. 21 (2012): 211903. http://dx.doi.org/10.1063/1.4720169.

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15

Hayroyan, S. G., and H. S. Hayroyan. "Methods for determining shear resistance by a system of cracks and old slip surfaces with the purpose to evaluate the stability of landslides." Journal of Physics: Conference Series 2231, no. 1 (2022): 012017. http://dx.doi.org/10.1088/1742-6596/2231/1/012017.

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Abstract On slopes, landslide displacements mainly occur along bedding boundaries, lithogenetic and tectonic fractures, as well as along existing ancient slip surfaces, which are the weak zones and potential slip surfaces for new landslides. According to experimental studies to determine the shear resistance by the standard and double cut test methods: a) without wetting the sliding surface, and b) by the wetting the sliding surface, we can conclude: when double- cutting the clay soils of a solid, semi-solid and tight-plastic consistency, the cohesion is mainly reduced, but the internal fricti

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16

Hayroyan, S. G., and H. S. Hayroyan. "Methods for determining shear resistance by a system of cracks and old slip surfaces with the purpose to evaluate the stability of landslides." Journal of Physics: Conference Series 2231, no. 1 (2022): 012017. http://dx.doi.org/10.1088/1742-6596/2231/1/012017.

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Abstract On slopes, landslide displacements mainly occur along bedding boundaries, lithogenetic and tectonic fractures, as well as along existing ancient slip surfaces, which are the weak zones and potential slip surfaces for new landslides. According to experimental studies to determine the shear resistance by the standard and double cut test methods: a) without wetting the sliding surface, and b) by the wetting the sliding surface, we can conclude: when double- cutting the clay soils of a solid, semi-solid and tight-plastic consistency, the cohesion is mainly reduced, but the internal fricti

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17

Lian, Yong, Li Hu, Tao Zhou, Mingbo Yang, and Jin Zhang. "Numerical Investigation of Secondary Deformation Mechanisms on Plastic Deformation of AZ31 Magnesium Alloy Using Viscoplastic Self-Consistent Model." Metals 9, no. 1 (2019): 41. http://dx.doi.org/10.3390/met9010041.

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Uniaxial tension and compression of AZ31 magnesium alloy were numerically investigated via the viscoplastic self-consistent (VPSC) model to shed a light on the effect of secondary deformation mechanisms (prismatic <a> slip, pyramidal <c+a> slip, and { 10 1 ¯ 1 } contraction twinning) during plastic deformation. The method adopted in the present study used different combinations of deformation mechanisms in the VPSC modeling. In terms of the pyramidal <c+a> slip, it served as the first candidate for sustaining the extra plastic strain during the plastic deformation. The improv

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18

Yu, Qin, Jian Wang, and Yanyao Jiang. "Inverse Slip Accompanying Twinning and Detwinning during Cyclic Loading of Magnesium Single Crystal." Journal of Materials 2013 (September 17, 2013): 1–8. http://dx.doi.org/10.1155/2013/903786.

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In situ, observation of twinning and detwinning in magnesium single crystals during tension-compression cyclic loading was made using optical microscopy. A quantitative analysis of plastic strain indicates that twinning and detwinning experience two stages, low and high work hardening de-twinning, and pure re-twinning and fresh twinning combined with retwinning. Slip is always activated. For the first time, inverse slip accompanying with pure retwinning and high work hardening detwinning was experimentally identified, which provides insights in better understanding of the activity of twining,

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19

Man, Jiří, Anja Weidner, Petr Klapetek, and Jaroslav Polák. "Slip Activity of Persistent Slip Bands in early Stages of Fatigue Life of Austenitic 316L Steel." Key Engineering Materials 592-593 (November 2013): 785–88. http://dx.doi.org/10.4028/www.scientific.net/kem.592-593.785.

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Flat specimen of 316L steel was cyclically pre-deformed with constant plastic strain amplitude to early stage of fatigue life relevant to the period of cyclic strain localization and fatigue crack initiation. To document slip activity and reversibility/irreversibility of persistent slip bands (PSBs) in situ experiments in the high-resolution SEMFEG under special imaging conditions were performed. The half-and full-cycle slip activity and distribution of plastic strain within PSBs in individual grains were investigated via slip steps generated in half-and full-cycle deformation after intermedia

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20

Eterashvili, Tamaz, T. Dzigrashvili, and M. Vardosanidze. "Initial Aspects of Low-Cycle Fatigue Fracture of Martensitic Steels." Key Engineering Materials 348-349 (September 2007): 385–88. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.385.

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This study deals with the SEM and optical microscopic characterization of fatigue plastic deformation process during fatigue crack initiation to understand where, why and how cracks initiate under conditions of low cycle fatigue. Samples were prepared from the 13Х11Н2В2МФ high-chromium stainless steel used for fusion power applications. The low-cycle tests were conducted at room temperature with the standard V-notched samples prepared from conventional stainless steel. The following characteristics were studied during fatigue tests: 1 macrocrack propagation, 2. interaction between macrocrack a

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21

Uehara, Takuya. "An Atomistic Study on the Slip Deformation Mechanism of Crystalline Materials Using a Weak-Plane Model." Applied Mechanics and Materials 197 (September 2012): 321–26. http://dx.doi.org/10.4028/www.scientific.net/amm.197.321.

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Molecular dynamics simulations were carried out to investigate the plastic deformation mechanism of fcc crystalline materials using the conventional Lennard-Jones potential. An fcc structure with square cross-section was prepared, and a tensile load was applied in the longitudinal direction. A weak potential was assigned to a specific (111) plane to induce a slip on the specified plane. Accordingly, a slip was initiated in the weak plane following an elastic deformation. The step-by-step motion of the atoms on the slip plane was studied, and a detailed trajectory is presented. The slip then ex

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22

Polák, Jaroslav, and Jiří Man. "Cyclic Slip Localization and Crack Initiation in Crystalline Materials." Advanced Materials Research 891-892 (March 2014): 452–57. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.452.

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Cyclic plastic straining in crystalline materials is localized to persistent slip bands (PSBs) and results in formation of persistent slip markings (PSMs) consisting of extrusions and intrusions. Intensive plastic strain in PSBs results in dislocation interactions and formation of point defects. The extended model based on point defect formation, migration and annihilation is presented describing surface relief formation in the form of extrusion-intrusion pairs. Point defect migration and resulting mass transfer is the principle source of cyclic slip irreversibility leading to crack-like defec

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23

Serre, Ingrid, Daniel Salazar, and Jean Bernard Vogt. "Plastic Deformation Quantified by Atomic Force Microscopy Measurements for Duplex Stainless Steel under Monotonic and Cyclic Loading." Applied Mechanics and Materials 13-14 (July 2008): 163–72. http://dx.doi.org/10.4028/www.scientific.net/amm.13-14.163.

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By atomic force microscopy, the plastic deformation marks resulting from monotonic and cyclic plastic deformation were analysed to study the plasticity in each phase of Duplex Stainless Steels. In austenite, straight slip bands were observed after monotonic loading. These straight slip bands seem to serve as fatigue extrusion nucleation sites, which are the marks of the accommodation of the cyclic plasticity by the austenite. In ferrite, after monotonic loading, slip bands, could be classified into two different groups depending on whether they result from the bulk activities of ferrite or whe

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24

Eterashvili, Tamaz, T. Dzigrashvili, and M. Vardosanidze. "TEM Study of Microstructure Changes, Formation and Distribution of Slip Bands in Austenitic Steels after Low-Cycle Fatigue (LCF) Deformation - II." Key Engineering Materials 665 (September 2015): 141–44. http://dx.doi.org/10.4028/www.scientific.net/kem.665.141.

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The microstructure changes, development of micro plastic deformation and formation and distribution of slip bands were studied. It is shown that development of micro deformation during LCF depends on loading conditions (amplitude and number of cycles) and microstructureIt is shown that as non-localized as well as localized micro plastic deformation takes place because of structural inhomogeneity. Supposedly, the localized deformation is related to the sites of internal stress concentration accumulated during the LCF.The effect of microstructure of structural steels on the rate of local cyclic

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25

Tabatabaei Mirhosseini, Ramin, Ehsan Araghizadeh, and Soroush Rashidi. "Approximate Relationship for the Bond-Slip Using a Concrete Damage-Plastic Model." Advances in Materials Science and Engineering 2023 (April 17, 2023): 1–15. http://dx.doi.org/10.1155/2023/1320192.

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This paper presents an approximate multicontact model to study dynamic bond stress-slip based on the concrete damage-plastic model. To establish the bond stress-slip between rebar and concrete, an elastic-plastic steel cylinder contact element was used as the tube (ring contact element), and then, by reducing the bond strength, the amount of slip between rebar and concrete and its effect on concrete damage-plastic parameters were considered. When concrete cracks, the parameters of concrete cracking, the plasticity of rebar and concrete fracture, and the pull-out of rebar from concrete are used

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26

Li, Haitao, Chenxu Li, Dongmei Chen, et al. "Temperature-Dependent Deformation Mechanisms in Ti65 Alloy: An In Situ Tensile Study." Materials 18, no. 14 (2025): 3270. https://doi.org/10.3390/ma18143270.

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Understanding the relationship between deformation behavior and mechanisms at elevated temperatures is of great significance for applications of high-temperature titanium alloys. This study systematically investigates the plastic deformation behavior of Ti65 alloy under both room-temperature and high-temperature conditions through in situ tensile testing, combined with slip trace analysis, crystal orientation analysis, and geometrical compatibility factor evaluation. TEM observations and molecular dynamics simulations reveal that plastic deformation is predominantly accommodated by basal and p

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27

Wu, Bingxin, Kaikai Jin, and Yin Yao. "Molecular Dynamics Study on the Mechanical Behaviors of Nanotwinned Titanium." Metals 14, no. 8 (2024): 918. http://dx.doi.org/10.3390/met14080918.

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Titanium and titanium alloys have been widely applied in the manufacture of aircraft engines and aircraft skins, the mechanical properties of which have a crucial influence on the safety and lifespan of aircrafts. Based on nanotwinned titanium models with different twin boundary spacings, the impacts of different loadings and twin boundary spacings on the plastic deformation of titanium were studied in this paper. It was found that due to the different contained twin boundaries, the different types of nanotwinned titanium possessed different dislocation nucleation abilities on the twin boundar

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28

Schmalzer, Andrew M., and A. Jeffrey Giacomin. "Die drool theory." Journal of Polymer Engineering 33, no. 1 (2013): 1–18. http://dx.doi.org/10.1515/polyeng-2012-0044.

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Abstract When molten plastic is extruded from a die, it sometimes collects on the open face of the die. Known as die drool, this phenomenon costs plastics manufacturers by requiring die cleaning. This has been attributed to many causes, but none of these has led to an equation for the drool rate. In this work, we provide an exact analytical solution for the drool rate, and we base this solution on a postulate of a cohesive slip layer near the die walls. We thus attribute die drool to cohesive failure within the fluid at an internal surface where the fluid slips on itself. We adimensionalize th

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29

Matsuno, Hiroshi. "Characteristics of Complementary Plastic Energy Produced by Hysteresis Curves and Analyses of Microstructures in Fatigued Metals." Key Engineering Materials 340-341 (June 2007): 513–18. http://dx.doi.org/10.4028/www.scientific.net/kem.340-341.513.

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Experimental characteristics of complementary plastic energy produced by a stress-strain hysteresis curve at a saturated stage in low cycle fatigue are investigated for some steels, and mechanical models for analyzing microstructures of fatigued metals are discussed. As a result, it is found that volume of a cell is varied in inverse proportion to plastic strain range: the density of cells is in proportion to plastic strain range. Consequently, the total number of cells is proportional to plastic strain range. This final conclusion is similar to Winter's opinion concerning persistent slip band

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30

Xu, Shuang, and Ya Fang Guo. "Effects of Strain Rate on the Tensile Deformation of Single-Crystal Copper Films." Materials Science Forum 675-677 (February 2011): 671–73. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.671.

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Molecular dynamics (MD) simulations with an EAM potential are carried out to study the strain rate effects on the tensile deformation of single-crystal copper films. The stress, the atomic energy, as well as the atomic configurations of the systems are presented to explore the strain rate effects on copper films. It is found that yield stress increases with loading rate. Meanwhile, deformation mechanisms with different strain rates are analyzed in the present work. At lower strain rate, slips along {111} planes are primarily responsible for the plastic deformation in nano-Cu films. As strain r

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31

Matsugaki, Aira, Gento Aramoto, Takuya Ishimoto, and Takayoshi Nakano. "Control of Osteoblastic Cell Behavior by Surface Topography Introduced by Plastic Deformation of Ti Single Crystal with h.c.p. Structure." Materials Science Forum 706-709 (January 2012): 549–52. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.549.

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Cells are known to sense the topographic features of the substrate and align along the direction of the surface pattern, and this is believed to be an important aspect in the formation and regeneration of anisotropic biological tissues. In this study, a unique and anisotropic stepped pattern was produced on single crystals of α-Ti with the h.c.p. lattice by plastic deformation in compression to demonstrate the effect of the pattern on cell behavior. Because the Schmid factor for the operative slip system of prismatic (100)[110] was set to be 0.5, the slip traces with an acute angle of 45° appe

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32

Xu, Biqiang, and Yanyao Jiang. "Elastic-Plastic Finite Element Analysis of Partial Slip Rolling Contact." Journal of Tribology 124, no. 1 (2001): 20–26. http://dx.doi.org/10.1115/1.1395630.

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The finite element model with the implementation of a robust cyclic plasticity theory was used to simulate the elastic-plastic stresses for the partial slip (stick-slip) line rolling contact. Detailed rolling contact stresses and strains were obtained for up to 40 rolling passes. The partial slip condition greatly affects the residual stress in the rolling direction and the residual shear strain within a thin layer of material near the contact surface. The residual stress in the axial direction was not significantly influenced by the partial slip condition. An increase in friction coefficient

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33

Zaiser,, M., and E. C. Aifantis,. "Avalanches and Slip Patterning in Plastic Deformation." Journal of the Mechanical Behavior of Materials 14, no. 4-5 (2003): 255–70. http://dx.doi.org/10.1515/jmbm.2003.14.4-5.255.

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34

Muñoz, A., A. Domínguez-Rodríguez, and J. Castaing. "Slip Systems and plastic anisotropy in CaF2." Journal of Materials Science 29, no. 23 (1994): 6207–11. http://dx.doi.org/10.1007/bf00354561.

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35

Setz, Luiz Fernando Grespan, Laís Koshimizu, Sonia Regina Homem de Mello-Castanho, and Márcio Raymundo Morelli. "Rheological Analysis of Ceramics Suspensions with High Solids Loading." Materials Science Forum 727-728 (August 2012): 646–51. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.646.

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The pure oxides (yttria, zirconia, titania, alumina, etc.) pastes ceramics production by concentrate suspensions is interesting because differently than plastic ceramics (clays), where these behaviours are often empirical available, the rheological suspensions behaviour are extensively studied. Thus, controlling the concentrate slips rheological parameters, is possible extend these analysis for better understand and control the plastic pastes production, providing subsidies to obtain after shaping process, such as extrusion and calendering, suitable products for the desired application. Thus,

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36

Zhang, Xin Ming, and Yang Xiao. "Fracture Mechanism Analysis of Mg-9Gd-4Y-0.6Zr Alloy." Materials Science Forum 546-549 (May 2007): 261–66. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.261.

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The fractographs of Mg-9Gd-4Y-0.6Zr alloy specimens which were tensioned at different temperatures were investigated by optical and scanning electron microscopy, respectively. The results showed that different slip systems were activated at different temperatures, which were responsible for varied deformation mechanisms and fracture mechanisms. At 25 °C, the enabled slip systems were few and only the slip systems on basal plane were able to be activated, so cleavage fracture was observed. At −196°Cthe number of enabled slip systems increased, prismatic or pyramidal slip maybe occurred, so that

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37

Непершин, Р. И. "Поперечное сдавливание цилиндра штампом с криволинейной гладкой границей". Вестник Чувашского государственного педагогического университета им. И.Я. Яковлева. Серия: Механика предельного состояния, № 3(61) (19 грудня 2024): 43–59. https://doi.org/10.37972/chgpu.2024.61.3.005.

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Приведено численное моделирование поперечного сдавливания жесткопластического цилиндра штампом с гладкой криволинейной границей. Рассматривается плоское пластическое течение при вогнутовыпуклой границе штампа с непрерывным полем скоростей на конечной стадии сдавливания. Заполнение полости штампа на вогнутом участке границы происходит без скольжения по границе контакта и моделируется линиями скольжения по Прандтлю с разрывом скоростей по жесткопластическим границам. При скольжении по выпуклой границе происходит уменьшение жесткой области на вогнутой границе контакта, переходящее в пластическое

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Wang, Hongbo, Bowen Huang, Wangyu Hu та Jian Huang. "Studying Plastic Deformation Mechanism in β-Ti-Nb Alloys by Molecular Dynamic Simulations". Metals 14, № 3 (2024): 318. http://dx.doi.org/10.3390/met14030318.

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Using molecular dynamics (MD) simulations, the transition of the plastic deformation mechanism of Ti-Nb alloys during the tensile process was studied, and the effects of temperature, Nb composition, and strain rate on the deformation mechanism were also investigated. The results show that the deformation process of Ti-Nb alloys involves defect formation, followed by twinning and ω-phase transition, and ultimately, dislocation slip occurs. The <111>{112} slip makes the ω-phase easily overcome the transition energy barrier, inducing the phase transition in the twinning process. Increasing

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Polák, Jaroslav. "Role of Persistent Slip Bands and Persistent Slip Markings in Fatigue Crack Initiation in Polycrystals." Crystals 13, no. 2 (2023): 220. http://dx.doi.org/10.3390/cryst13020220.

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The cyclic plastic deformation of polycrystals leads to the inhomogeneous distribution of the cyclic plastic strain. The cyclic plastic strain is concentrated in thin bands, called persistent slip bands (PSBs). The dislocation structure of these bands generally differs from the matrix structure and is characterized by alternating dislocation-rich and dislocation-poor regions. The mechanisms of the dislocation motion in the PSBs and the formation of the point defects and their migration are quantitatively described. It is shown that, due to localized cyclic plastic straining in the PSBs, persis

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Zeng, Bo, Hongwei Liu, Hongzhou Song, et al. "Design and slip prevention control of a multi-sensory anthropomorphic prosthetic hand." Industrial Robot: the international journal of robotics research and application 49, no. 2 (2021): 289–300. http://dx.doi.org/10.1108/ir-07-2021-0133.

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Purpose The purpose of this paper is to design a multi-sensory anthropomorphic prosthetic hand and a grasping controller that can detect the slip and automatically adjust the grasping force to prevent the slip. Design/methodology/approach To improve the dexterity, sensing, controllability and practicability of a prosthetic hand, a modular and multi-sensory prosthetic hand was presented. In addition, a slip prevention control based on the tactile feedback was proposed to improve the grasp stability. The proposed controller identifies slippages through detecting the high-frequency vibration sign

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Wang, Jiwei, Bin Shao, Debin Shan, Bin Guo та Yingying Zong. "The Effect of Hydrogen on Plastic Anisotropy of Mg and α-Ti/Zr from First-Principles Calculations". Materials 16, № 8 (2023): 3016. http://dx.doi.org/10.3390/ma16083016.

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Mg and α-Ti/Zr exhibit high plastic anisotropy. In this study, the ideal shear strength across the basal, prismatic, pyramidal I, and pyramidal II slip systems in Mg and α-Ti/Zr with and without hydrogen was computed. The findings indicate that hydrogen reduces the ideal shear strength of Mg across the basal and pyramidal II slip systems, as well as of α-Ti/Zr across all four systems. Moreover, the activation anisotropy of these slip systems was analyzed based on the dimensionless ideal shear strength. The results suggest that hydrogen increases the activation anisotropy of these slip systems

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Fu, Ge Yan, and Shi Hong Shi. "Mechanism Research of Low-Stress Threshold of Plastic Accumulation under Super-Low Repeated Impact Stress." Key Engineering Materials 464 (January 2011): 605–8. http://dx.doi.org/10.4028/www.scientific.net/kem.464.605.

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It is discovered that, if material has been applied with super-low impact stress that for certain times, macroscopic plastic deformation may be happen. The stress can be far below the static yield limit of material. The strain rate will decrease with impact times and distance from the surface. For exploring the micro-mechanism of the new deformation phenomena, the paper presents the theory of dislocation slip based on the principle of superposed dislocation vibration and the microscopic dislocation slip model under low-stress repeated impact. Analysis showed that the stress threshold is relate

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Zeng, Xiang Guo, Qing Yuan Wang, Jing Hong Fan, Zhan Hua Gao, and Xiang He Peng. "A Cyclic Stress-Strain Constitutive Model for Polycrystalline Magnesium Alloy and its Application." Materials Science Forum 546-549 (May 2007): 81–88. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.81.

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The stress-strain behavior of cast magnesium alloy (AM60) was investigated by strain-controlled cyclic testing carried out on MTS. In order to describe the cyclic stress and strain properties of AM60 by means of the energy storing characteristics of microstructure during irreversible deformation, a plastic constitutive model with no yielding surface was developed for single crystal by adopting a spring-dashpot mechanical system. Plastic dashpots reflecting the material transient response were introduced to describe the plasticity of slip systems. By utilizing the KBW self-consistent theory, a

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Brown, Donald W., Sean R. Agnew, S. P. Abeln, et al. "The Role of Texture, Temperature and Strain Rate in the Activity of Deformation Twinning." Materials Science Forum 495-497 (September 2005): 1037–42. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.1037.

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Plastic deformation in cubic metals is relatively simple due to the high crystallographic symmetry of the underlying structure. Typically, one unique slip mode can provide arbitrary deformation. This is not true in lower symmetry hexagonal metals, where prismatic and basal slip (the usual favored modes) are insufficient to provide arbitrary deformation. Often, either pyramidal slip and/or deformation twinning must be activated to accommodate imposed plastic deformation. The varied difficulty of activating each of these deformation mechanisms results in a highly anisotropic yield surface and su

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Abe, Takeji. "On the Relation between R-Value of a Grain and the Operating Slip Systems of the Grain." Key Engineering Materials 626 (August 2014): 566–69. http://dx.doi.org/10.4028/www.scientific.net/kem.626.566.

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The r-value is defined as the ratio of the width strain to the thickness strain under uniaxial tensile loading. The r-value can be defined for each grain in polycrystalline metal during plastic deformation. It was pointed out that r-value of a grain affects the surface roughening of polycrystalline metal, and hence also affects the formability of thin sheet metal. On the other hand, it was shown that by using a rate-type constitutive relation for crystal slips the effect of the number of active slip systems on the yield curves is clarified. In the present paper, the relation between r-value of

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Alharbi, Hamad F., Monis Luqman, Ehab El-Danaf, and Nabeel H. Alharthi. "Experimental and Numerical Study of Texture Evolution and Anisotropic Plastic Deformation of Pure Magnesium under Various Strain Paths." Advances in Materials Science and Engineering 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/2867281.

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The deformation behavior and texture evolution of pure magnesium were investigated during plane strain compression, simple compression, and uniaxial tension at room temperature. The distinctive stages in the measured anisotropic stress-strain responses and numerically computed strain-hardening rates were correlated with texture and deformation mechanisms. More specifically, in plane strain compression and simple compression, the onset of tensile twins and the accompanying texture-hardening effect were associated with the initial high strain-hardening rates observed in specimens loaded in direc

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Jang, Min Gyu, Chul Hee Lee, and Seung Bok Choi. "Stick-Slip Compensation of Micro-Positioning Using Elastic-Plastic Static Friction Model." Advanced Materials Research 47-50 (June 2008): 246–49. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.246.

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In this paper, a stick-slip compensation for the micro-positioning is presented using the statistical rough surface contact model. As for the micro-positioning structure, PZT (lead(Pb) zirconia(Zr) Titanate(Ti)) actuator is used to drive the load for precise positioning with its high resolution incorporating with the PID (Proportional Integral Derivative) control algorithm. Since the stick-slip characteristics for the micro structures are highly nonlinear and complicated, it is necessary to incorporate more detailed stick-slip model for the applications involving the high precision motion cont

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Eterashvili, Tamaz, Temur Dzigrashvili, and M. Vardosanidze. "SEM Study of the Influence of Microstructure on Low Cycle Fatigue Crack Growth in Martensitic Steel I." Key Engineering Materials 774 (August 2018): 96–100. http://dx.doi.org/10.4028/www.scientific.net/kem.774.96.

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Distribution of fatigue cracks in chromium martensitic steel after low cycle fatigue (LCF) tests at room temperature has been studied using SEM, and the experimental evidences of localized plastic flow (LPF) are presented. The influence of the location of LPF and the microstructure elements on the trajectory and growth of microcracks is also considered. The dimensions of plastic zones ahead of macrocrack tip as well as at its edges were measured in the process of crack propagation inside of the sample. The processes occurring in plastic zone, particularly ahead of macrocrack tip, were analyzed

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Meng, Li, Ping Yang, Zude Zhao, and Wei Min Mao. "An OIM Analysis on the Deformation Mechanism in Hot Compressed AZ31 Magnesium Alloy." Materials Science Forum 488-489 (July 2005): 633–36. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.633.

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Orientation mapping based on EBSD technique was applied to analyze the rules of orientation evolution of grains in AZ31 magnesium alloy. Results show that not only under deformation strain rate of 1×10-2s-1, but under 4×10-4s-1(the superplastic deformation condition), grains in all samples with initial textures rotate gradually to near basal orientation ({0002} || compression plane) at different ways, and basal texture becomes stronger with increasing strain, which indicates plastic slip plays an important role during hot deformation. Otherwise, no evident non-basal pyramidal slip of <a+c&g

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Zou, Zongxing, Qi Zhang, Chengren Xiong, et al. "In Situ Shear Test for Revealing the Mechanical Properties of the Gravelly Slip Zone Soil." Sensors 20, no. 22 (2020): 6531. http://dx.doi.org/10.3390/s20226531.

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Slip zone soil is usually composed of clay or silty clay; in some special geological environments, it contains gravels, which make the properties of the slip zone soil more complex. Unfortunately, in many indoor shear tests, gravels are removed to meet the demands of apparatus size, and the in situ mechanical property of the gravelly slip zone soil is rarely studied. In this study, the shear mechanical property of the gravelly slip zone soil of Huangtupo landslide in the Three Gorges Reservoir area of China was investigated by the in situ shear test. The test results show that the shear deform

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