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Journal articles on the topic 'Plastic deformations'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Liu, Jing, Zhifeng Shi, Yimin Shao, and Huifang Xiao. "Effects of spall edge profiles on the edge plastic deformation for a roller bearing." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 5 (2017): 850–61. http://dx.doi.org/10.1177/1464420717710276.

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A clear understanding of the plastic deformations at the spall edges is a primary task for the edge propagation predictions in rolling element bearings. This work proposed an elastic–plastic two-dimensional finite element model for calculating the contact stress and plastic deformation between the rolling element and raceway. This model includes a rolling element and one raceway. The rectangular plane strain solid elements are used to formulate the finite element model. The Coulomb model is used to formulate the friction force between the rolling element and raceway. A bilinear kinematic harde

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2

Buketkin, B. V., V. M. Zyablikov, and A. A. Shirshov. "EVALUATION OF RESIDUAL STRESSES DURING PLASTIC BENDING." Spravochnik. Inzhenernyi zhurnal, no. 303 (June 2022): 20–23. http://dx.doi.org/10.14489/hb.2022.06.pp.020-023.

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The technological operation of bending is widely used in the manufacture of various parts, both rod-like, for example, springs of various types, and shell-type, such as shells and bottoms of petrochemical apparatus, hulls of ships, automobiles. The magnitude of the maximum plastic deformations arising in this case varies within wide limits and can reach rather large values, significantly exceeding the elastic deformations. Regardless of the level of maximum deformations in the product, residual stresses arise, affecting its performance. The paper proposes an approximate method for assessing re

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3

Tang, Ai Jun, Hai Long Ma, and Zhan Qiang Liu. "Elastic-Plastic Deformation of Milling Thin Wall Part." Applied Mechanics and Materials 345 (August 2013): 321–24. http://dx.doi.org/10.4028/www.scientific.net/amm.345.321.

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Aircraft components are mostly made by aluminum alloy as thin wall types. These parts are usually end milled to required thicknesses and tight tolerances in specific areas. The thin wall parts are difficult to machine because they are easy to vibrate and deformed due to their lower rigidity. This paper proposes a new elastic-plastic deformation model which is suitable for prediction of machining deformations of end milled thin wall parts. The theoretical deformation model is established on the basis of the equations of Von Kármán. The part deformations are simulated using FE analysis and Matla

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4

Dragobetskii, Volodymyr, Mykhaylo Zagirnyak, Olena Naumova, Sergii Shlyk, and Aleksandr Shapoval. "Method of Determination of Technological Durabilityof Plastically Deformed Sheet Parts of Vehicles." International Journal of Engineering & Technology 7, no. 4.3 (2018): 92. http://dx.doi.org/10.14419/ijet.v7i4.3.19558.

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The purpose of the article is to develop an apparatus providing maximum or predicted durability of parts treated during their manufacture by plastic deformation. In these terms, the parameters of the technological process should provide the maximum or expected increase of the endurance limit in comparison with the initial parts values before the strengthening by the surface plastic deformation or after plastic forming. The article describes the influence of the degree of preliminary deformation on the kinetics of fatigue failure of metals and alloys. Experimental data of the ultimate deformati

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Barkov, L. A., Marina N. Samodurova, and O. A. Nevraeva. "Kinematic and Dynamic Conditions in Metal Rolling of Porous Materials." Materials Science Forum 989 (May 2020): 705–10. http://dx.doi.org/10.4028/www.scientific.net/msf.989.705.

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Mathematical modeling of plastic deformations in rolling consists in a consequent combination of the general energetic relationship in plasticity and the variation inequality expressed the principle of minimum of entire deformation energy. A real deformation state in a plastic zone beneath rolls and corresponding kinematic and dynamics conditions on the contact surface are considered as a limited one for the consequent approximate deformation states and are found out by the method of approximated approach. Any realization of this method on personal computers requires a rational construction of

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6

Kvačkaj, Tibor, and Jana Bidulská. "From Micro to Nano Scale Structure by Plastic Deformations." Materials Science Forum 783-786 (May 2014): 842–47. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.842.

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Nowadays, the strategy for improving of mechanical properties in metals is not oriented to alloying followed by heat treatment. An effective way how to improve the mechanical properties of metals is focused on the research looking for some additional structural abilities of steels. Structural refinement is one of the ways. Refinement of the austenitic grain size (AGS) carried out through plastic deformation in a spontaneous recrystallization region of austenite, formation of AGS by plastic deformations in a non-recrystallized region of austenite will be considered as potential ways for AGS ref

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7

Stefanelli, Ulisse. "Existence for dislocation-free finite plasticity." ESAIM: Control, Optimisation and Calculus of Variations 25 (2019): 21. http://dx.doi.org/10.1051/cocv/2018014.

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This note addresses finite plasticity under the constraint that plastic deformations are compatible. In this case, the total elastoplastic deformation of the medium is decomposed as y = ye ○ yp, where the plastic deformation yp is defined on the fixed reference configuration and the elastic deformation ye is a mapping from the varying intermediate configuration yp(Ω). Correspondingly, the energy of the medium features both Lagrangian (plastic, loads) and not Lagrangian contributions (elastic). We present a variational formulation of the static elastoplastic problem in this setting and show tha

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8

Mykhalevych, Volodymyr, Andrii Shtuts, and Mykola Kolisnyk. "INVESTIGATION OF STAMPING BY WRAPPING PROCESSES THROUGH MATERIAL DEFORMATION MODELING ANALYSIS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 3(122) (December 2, 2023): 22–34. http://dx.doi.org/10.37128/2520-6168-2023-3-3.

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This scientific article addresses the pressing issue of material deformation modeling in the context of stamping by wrapping processes (SWP). The main challenges in the development of these processes include the likelihood of workpiece failure due to insufficient material plasticity and unfavorable stress-strain states, determined by technological process parameters. Thus, effective SWP process development requires the utilization of material deformation modeling. The article indicates that any material deformation model in plastic deformation processes comprises three main elements: Analytica

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9

Williamson, M., and A. Majumdar. "Effect of Surface Deformations on Contact Conductance." Journal of Heat Transfer 114, no. 4 (1992): 802–10. http://dx.doi.org/10.1115/1.2911886.

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This study experimentally investigates the influence of surface deformations on contact conductance when two dissimilar metals are brought into contact. Most relations between the contact conductance and the load use the surface hardness to characterize surface deformations. This inherently assumes that deformations are predominantly plastic. To check the validity of this assumption, five tests were conducted in the contact pressure range of 30 kPa to 4 MPa, with sample combinations of (I) smooth aluminum-rough stainless steel, (II) rough aluminum-smooth stainless steel, (III) rough copper-smo

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10

Wang, Bo, and Anjiang Cai. "Influence of mold design and injection parameters on warpage deformation of thin-walled plastic parts." Polimery 66, no. 5 (2021): 283–92. http://dx.doi.org/10.14314/polimery.2021.5.1.

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Thin-walled plastic parts are susceptible to deformation during injection molding. Using the example of a notebook battery cover, optimization of the injection mold design and injection process parameters was performed with Moldflow software, which resulted in about 69% reduction of the deformations. Moreover, the uneven material shrinkage during the injection process has been shown to be the main cause of deformations of thin-walled plastic parts.

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11

Bucko, Stefan, Henryk Jodłowski, and Marcin Trzebicki. "An Experimental-Numerical Analysis of Plastic Zones Initiation Around Holes in Shields Made of Steel C45 Under Tension." Archive of Mechanical Engineering 61, no. 1 (2014): 179–98. http://dx.doi.org/10.2478/meceng-2014-0011.

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Abstract The paper presents the results of research on the plastic zones formation in thin (3.51 [mm]) shields made of steel C45 with holes of 4, 10 and 20 diameters. The authorship method of identifying plastic macro-strains utilizing optical interference phenomenon was used in the experiments. The basic idea of the method is summarized below as being: “The occurrence of plastic deformations in the active process of loading is testified by a loss of the interference fringes that were previously present or by a clear and rapid change in their character”. In the experiments, the values of the s

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12

Degtyarev, Kirill, Vasyl Gnitko, and Anatoly Tonkonozhenko. "Finite element method in determining the destructive load on the perforated shell under short-term forces." 48, no. 48 (December 28, 2020): 22–35. http://dx.doi.org/10.26565/2304-6201-2020-48-02.

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Stress-strain state of cylindrical shells with periodic system of openings is considered. It is supposed that the shell moves under the influence of short-term intense load. The method of determining destructive loads in case of short-term force effects on a perforated cylindrical shell is proposed. The problem of determining the shell motion is considered in the elastic-plastic formulation. It is supposed that when the equivalent loads are equal to or exceed the yield strength; plastic deformations begin to develop in the elastic body. The zone of plastic deformations is specified at each ste

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13

Goanta, Viorel. "Experimental Analysis Regarding the Degree of Plastic Deformation of Fractured Surfaces under da/dN, K_Ic and J_IcDetermination." Applied Mechanics and Materials 658 (October 2014): 189–94. http://dx.doi.org/10.4028/www.scientific.net/amm.658.189.

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When loaded over their yield strength, materials suffer significant plastic deformations. In such zones, the degree of plastic deformation depends on the characteristics of the material and also on the nature of the loading. As known, the degree of plastic deformation may be correlated with the value of hardness, determined in the plastically-deformed zone. The present paper discusses the three types of testings applied, which led to the fracture of some specimens and, consequently, to plastic deformations in the immediate vicinity of the fractured surfaces. The testings, performed on Compact

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14

Xie, Fan, Weibin Li, and Yuxiang Zhang. "Monitoring of environmental loading effect on the steel with different plastic deformation by diffuse ultrasound." Structural Health Monitoring 18, no. 2 (2018): 602–9. http://dx.doi.org/10.1177/1475921718762323.

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Diffuse ultrasound is highly sensitive to changes in mechanical properties. Based on the coda wave interferometry analysis, we investigate the environmental temperature-induced wave velocity variations in high-manganese steels with plastic deformations by diffuse ultrasound. We observe the velocity changes in the materials at test with [Formula: see text] relative resolution. We propose the temperature-dependent coefficient as the key parameter for damage assessment in the specimens with different plastic deformations. The results show that the early-stage damage caused by plastic deformation

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15

Pop, Elena. "GENERATING SEVERE PLASTIC DEFORMATIONS THROUGH LAMINATION." Scientific Bulletin Series D : Mining, Mineral Processing, Non-Ferrous Metallurgy, Geology and Environmental Engineering 31, no. 2 (2017): 35–40. http://dx.doi.org/10.37193/sbsd.2017.2.05.

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This paper presents a theoretical and experimental study of the possible occurrence of microstructure up to nanometric level through severe plastic deformations. An aluminium alloy sample was laminated, in the form of a band and it withstood 4 passes through cylinders. As a result, ultrafine grains were obtained and the hardness of the sample increased. By generating severe plastic deformation through lamination, materials with ultrafine grains can be obtained. These materials possess a high potential of coping with many advanced applications in nanomaterials.

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16

Roslan, L., Tetsuya Ohashi, Yohei Yasuda, and Chikara Suruga. "Elasto-Plastic Deformation of Colony Boundaries in Pearlite Microstructure by Finite Element Analyses." Applied Mechanics and Materials 786 (August 2015): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amm.786.33.

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Elasto-plastic tensile deformations in multi-colony structures are studied by finite element analyses to investigate how the deformation in multi-colony structures influence the strain concentration around colony boundary. The results obtained from plastic strain distributions show that plastic strain concentrates around colony boundary when there is a large difference of deformation between adjacent colonies and around the point where boundaries of differently aligned colonies meet.

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17

Giambanco, F., and L. Palizzolo. "Optimal Bounds on Plastic Deformations for Bodies Constituted of Temperature-Dependent Elastic Hardening Material." Journal of Applied Mechanics 64, no. 3 (1997): 510–18. http://dx.doi.org/10.1115/1.2788922.

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Bounds are investigated on the plastic deformations in a continuous solid body produced during the transient phase by cyclic loading not exceeding the shakedown limit. The constitutive model employs internal variables to describe temperature-dependent elastic-plastic material response with hardening. A deformation bounding theorem is proved. Bounds turn out to depend on some fictitious self-stresses and mechanical internal variables evaluated in the whole structure. An optimization problem, aimed to make the bound most stringent, is formulated. The Euler-Lagrange equations related to this last

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18

Kravchuk, E. V., A. A. Iodchik, and V. A. Kravchuk. "LOAD-CARRYING ABILITY OF TRADITIONAL AND PRE-STRESED BIMETALLIC BEAMS UNDER PLASTIC RESPONSE OF THEIR WALL MATERIAL." Вестник ВСГУТУ 95, no. 4 (2024): 96–107. https://doi.org/10.53980/24131997_2024_4_96.

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The article theoretically determines maximum load-carrying ability of traditional bimetallic beams, optimal distribution of material along flange sheets and wall, and height of wall material zone of flowage. It is established that using high-strength steels according to GOST 27720 for bimetallic beam flanges, plastic deformations of wall material penetrate into depth of beam section at the distance of 0.3h (h-height of beam section). There is no plasticity hinge in wall material. The problem of finding depth, length and areas of plastic deformations in bimetallic beams prestressed by wall stre

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19

Kim, Seung Gyun, Eun Seong Yu, Jong Mo Lee, Seung Jae Moon, Ki-Yong Lee, and Byung Seong Bae. "P‐144: Late‐News Poster: Evaluation for Flexible Substrates According to the Number of Rollings." SID Symposium Digest of Technical Papers 54, no. 1 (2023): 1532–35. http://dx.doi.org/10.1002/sdtp.16883.

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A scratch test was performed to evaluate the substrate deformation according to the number of rolling times for the rollable display. For polyimide and thermal plastics polyurethane, the critical loads are analyzed according to the number of rolling times. As increasing the load, friction coefficients were measured during the scratch on films. The effect of substrate rolling times on plastic n and elastic deformations were evaluated.

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20

Dzhabrailov, Arsen, Anatoly Nikolaev, and Natalya Gureeva. "Calculation of thin-walled axisymmetrically loaded structures of the AIC taking into account FEM-based physical nonlinearity." BIO Web of Conferences 17 (2020): 00199. http://dx.doi.org/10.1051/bioconf/20201700199.

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The article describes an algorithm for calculating an axisymmetrically loaded shell structure with a branching meridian, taking into account elastic-plastic deformations when loading based on the deformation theory of plasticity without assuming that the material is incompressible during plastic deformations. The correct relations which determine the static conjugation conditions of several revolution shells in the joint assembly are used. A comparative analysis of finite element solutions is presented for various options plasticity matrix development at the loading stage.

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21

Sapieta, Milan, Vladimír Dekýš, Ondrej Štalmach, Alžbeta Sapietová, and Martin Svoboda. "Detection of Elastic Deformation in Metal Materials in Infrared Spectral Range." Materials 14, no. 18 (2021): 5359. http://dx.doi.org/10.3390/ma14185359.

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The aim of this work is to verify the presence of deformation in the metal specimen from the material AISI 316L by means of lock-in thermography. The specimen was cyclically loaded by the three-point bending in the fatigue testing machine. A response of the specimen to such excitation can be detected in the infrared spectrum and to determine temperature changes during a loading cycle. By means of the lock-in method, an increased signal to noise ratio (radiation energy detected by an infrared camera) was achieved. Besides, the temperature changes were determined on the basis of amplitudes of ra

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22

Tang, Ai Jun, and Zhan Qiang Liu. "Experiments and Simulation of Elastic-Plastic Deformation in Thin Wall Part Milling." Advanced Materials Research 314-316 (August 2011): 482–86. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.482.

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Aircraft components are mostly made by aluminum alloy as thin wall types. These parts are usually end milled to required thicknesses and tight tolerances in specific areas. The thin wall parts are difficult to machine because they are easy to vibrate and deformed due to their lower rigidity. This paper proposes a new elastic-plastic deformation model which is suitable for prediction of machining deformations of end milled thin wall parts. The theoretical deformation model is established on the basis of the equations of Von Kármán. The effect of bending springback is also taken into account. Th

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23

Zalilov, I. V., M. V. Ariskin, and D. O. Martyshkin. "Additive technologies for improving the strength and deformation characteristics of plastic washer joints of wooden structures." Bulletin of Science and Research Center of Construction 42, no. 3 (2024): 16–27. https://doi.org/10.37538/2224-9494-2024-3(42)-16-27.

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Introduction. Modern wooden structures are mostly connected by mechanical working joints. To increase the reliability of nodal joints, various kinds of washers can be pressed, inserted, or glued into the wood of the elements, thus ensuring the transmission of forces from one element to another. Joints on glued washers can transfer significant forces on a relatively small area of mutual contact, which is due to their high loadbearing capacity. Thus, the gluing of steel washers in places of increased stress concentration during force transfer ensures a significant redistribution of buckling/crac

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Kovtanyuk, L. V. "ANALYTICAL SOLUTION OF THE CREEP PROBLEM VISCOELASTIC MATERIAL IN A ROUND TUBE." Доклады Российской академии наук. Физика, технические науки 513, no. 1 (2023): 67–71. http://dx.doi.org/10.31857/s2686740023060111.

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Using a mathematical model of large deformations of materials with elastic, plastic and viscous properties, an analytical solution was obtained for deformation under creep conditions of a bung in a round tube with a varying pressure drop. The motion is considered taking into account the sliding of the material in the vicinity of the rigid wall of the pipe and its deformation under increasing, constant and decreasing pressure. Displacements, reversible and irreversible deformations, stresses at all stages of deformation, including residual deformations and stresses at full unloading are calcula

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25

Sokov, Valerii. "Study of influence of the auxiliary factors onto characteristics of elastic-plastic deformation in the stress concentrator of the beam-wall with broken edges." Scientific journal of the Ternopil national technical university 114, no. 2 (2024): 60–72. http://dx.doi.org/10.33108/visnyk_tntu2024.02.060.

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The thin-walled steel beam-wall with broken edges is being investigated, which is a part of many structures. The wall of this beam consists of two prismatic parts with a linear transition from a smaller to a larger wall height, together forming an angular upper edge with the edges of the prismatic parts. The lower linear edge of the wall is attached to the sheathing.The beam-wall is subjected to static and cyclic loads, under which elastic-plastic deformations strains may occur at in the stress concentrator. This leads to failure of static strength and growth of fatigue cracks. The factors inf

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26

Dafalias, Yannis. "Finite elastic-plastic deformations: Beyond the plastic spin." Theoretical and Applied Mechanics 38, no. 4 (2011): 321–45. http://dx.doi.org/10.2298/tam1104321d.

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One important aspect of finite elastic-plastic deformation constitutive theories is addressed in this work, namely the appropriate embedding of tensor-valued internal variables into the plastic deformation continuum description, which has been called physico-geometrical coupling reflecting the relation between geometry of deformation and the physical nature of an internal variable. In the past it was assumed hat such embedding was co-rotational with a material substructure, rotating independently from the continuum, which required the introduction of the concepts of constitutive and plastic sp

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27

Fatt, Michelle S. Hoo, Yi Liu, and Z. Brandon Wang. "Plastic Deformations of Impulsively Loaded, Rigid-Plastic Beams." Journal of Engineering Mechanics 126, no. 2 (2000): 157–65. http://dx.doi.org/10.1061/(asce)0733-9399(2000)126:2(157).

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28

Klochkov, Yuriy V., Anatoliy P. Nikolaev, Olga V. Vakhnina, and Mikhail Yu Klochkov. "Variants of determining correlations of deformation theory of plasticity in the calculation of shell of rotation on the basis of finite element method." Structural Mechanics of Engineering Constructions and Buildings 15, no. 4 (2019): 315–22. http://dx.doi.org/10.22363/1815-5235-2019-15-4-315-322.

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Relevance. The problems of decline of resource-demanding of objects of building and engineer dictate the necessity of consideration of processes of deformation of constructions at the resiliently-plastic state. The widely in-use theory of account of practical properties of material is a deformation theory of plasticity. The aim of the research is development of variants of receipt of determining correlations on the step of ladening at deformation of material outside a resiliency. Methods. Algorithms over of receipt of determining correlations of theory of small resiliently-plastic deformations

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29

Sahoo, Santosh Kumar, V. D. Hiwarkar, Prita Pant, et al. "Plastic Deformation of Textured Zircaloy 2." Materials Science Forum 702-703 (December 2011): 838–41. http://dx.doi.org/10.4028/www.scientific.net/msf.702-703.838.

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The present study deals with deformation behaviour of textured Zircaloy 2 with two dominant orientations: basal and non-basal. During initial stages (20%), two distinct class of grains were observed – non-deforming/non-fragmenting grains and deforming/fragmenting grains. The so-called non- deforming/non-fragmenting grains remain equiaxed even after 50% of deformation. They also have insignificant in-grain misorientation developments and have more residual stresses. Dislocation dynamics simulation showed that the dislocation interactions/mobility is insignificant in basal orientations at room t

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30

Piekarczuk, Artur, Ewa Szewczak, Ewelina Kozikowska, and Łukasz Gołębiowski. "3D Scanning of Wood–Plastic Composite Decking After Cyclic Thermal Action." Materials 18, no. 1 (2024): 97. https://doi.org/10.3390/ma18010097.

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Wood–plastic composites (WPC) combine the properties of polymers and wood, providing an attractive alternative to traditional materials, particularly for terrace flooring. When exposed to various environmental conditions, WPCs are affected by factors, such as water and ultraviolet (UV) radiation. Although most test methods for assessing the durability of these products have focused on changes in mechanical properties and linear dimensions, out-of-plane deformations (concavity and convexity) are often overlooked. This study focusses on evaluating the usefulness of the test method that allows fo

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31

Tutyshkin, Nikolai Dmitrievich. "Modeling of deformation damage of metals in case of plastic compression deformations." Chebyshevskii Sbornik 24, no. 5 (2024): 331–42. https://doi.org/10.22405/2226-8383-2023-24-5-331-342.

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The performance properties of many precision mechanical engineering products manufactured by plastic deformation methods depend significantly on the structural deformation damage of their material. In this regard, methods of mathematical modeling of the complex physical process of structural damage are essential for calculating and predicting reliable operational characteristics of these products. According to systematic experimental data, the damage of metals in large plastic deformations is mainly associated with the formation, growth and coalescence of pores. To formulate the defining relat

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Zhang, Peihong, Paul E. Lammert, and Vincent H. Crespi. "Plastic Deformations of Carbon Nanotubes." Physical Review Letters 81, no. 24 (1998): 5346–49. http://dx.doi.org/10.1103/physrevlett.81.5346.

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Grammenoudis, P., and Ch Tsakmakis. "Incompatible deformations - plastic intermediate configuration." ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 88, no. 5 (2008): 403–32. http://dx.doi.org/10.1002/zamm.200800015.

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Shakhov, Sergey, and Nikita Nikolaev. "Management of structural and mechanical properties of moulding compound using mineral additives." MATEC Web of Conferences 239 (2018): 04022. http://dx.doi.org/10.1051/matecconf/201823904022.

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The purpose of work: the choice of the rational composition of the batch mixture, which improves the molding properties of the silt loams in the production of wall ceramics by the method of plastic molding. In the course of the study, the fraction-size distribution and morphological features of the fractions were analyzed on a photometric sedimentometer FSX-6K and by optical microscopy. Determination of the plastic strength of elasto-visco-plastic systems was carried out by Rehbinder’s conical plastometer. The values of fast and slow elastic and plastic deformations were determined on an insta

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35

Luri, R., C. J. Luis, J. León, and M. A. Sebastian. "A New Configuration for Equal Channel Angular Extrusion Dies." Journal of Manufacturing Science and Engineering 128, no. 4 (2006): 860–65. http://dx.doi.org/10.1115/1.2194555.

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Equal channel angular extrusion or pressing (ECAE or ECAP) is a process used in order to impart severe plastic deformations to processed materials with the aim of improving their mechanical properties by reducing the grain size. The grain size reduction leads to mechanical properties improvement. In the present study, a new die configuration is proposed for the ECAE process. The advantage of this die geometry is that it allows us to obtain higher plastic strain in each ECAE passage than traditional ECAE dies. It is important to optimize the die geometry, as the main aim of the ECAE process is

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Spišák, Emil, Janka Majerníková, Emília Duľová Spišáková, and Ľuboš Kaščák. "Analysis of Plastic Deformation of Double Reduced Sheets." Acta Mechanica et Automatica 10, no. 4 (2016): 271–74. http://dx.doi.org/10.1515/ama-2016-0041.

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Abstract This paper discusses the causes and the effects of plastic deformation of double reduced sheets under uniaxial and biaxial loading. It focuses on the specific inhomogeneity and localization of plastic deformation, which is analysed in detail. The uniaxial and the hydraulic biaxial tensile tests were used for material testing and the results were compared and evaluated. The final part of the paper deals with the microstructure of material deformations.

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Lidyana, Roslan, Tetsuya Ohashi, Yohei Yasuda, Kohsuke Takahashi, and Chikara Suruga. "Finite Element Analyses of Elasto-Plastic Deformation in Pearlite Lamellar and Colony Structures." Key Engineering Materials 626 (August 2014): 307–10. http://dx.doi.org/10.4028/www.scientific.net/kem.626.307.

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Elasto-plastic tensile deformations in pearlite lamellar and two-colony structures are studied by finite element analyses to investigate the effects of lamellar thickness ratio and difference of lamellae orientation of two colonies in pearlite microstructure. The results obtained from plastic strain distributions in lamellar and colony structures show that plastic deformation in cementite lamellar stabilized when ferrite lamellar is thicker than cementite lamellar thickness and plastic strain concentrates when the difference between cementite lamellar orientation in two colonies are larger tha

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Ustinov, Artem M., Anatoliy A. Klopotov, A. I. Potekaev, et al. "Study of the Elasto-Plastic Deformation of the Steel/Steel Adhesive Joint Using Digital Image Correlation Method." Solid State Phenomena 303 (May 2020): 143–60. http://dx.doi.org/10.4028/www.scientific.net/ssp.303.143.

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The study of the steel/steel adhesive joint using digital image correlation method has been carried out. A correlation between the evolution of distributions of deformation regions on the surface of the adhesive joint and the stages on the deformation curve is revealed. It has been found that a destruction along the adhesive seam begins when the adhesive joint reaches total deformations of about 0.5%. The analysis of deformation fields on the steel surface have allowed revealing the formation of extensive tension regions with greatest deformations at the interface of loaded plates. An increase

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Hoo Fatt, M. S. "Rigid-Plastic Deformation of a Ring-Stiffened Shell Under Blast Loading." Journal of Pressure Vessel Technology 119, no. 4 (1997): 467–74. http://dx.doi.org/10.1115/1.2842331.

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An approximate solution for the plastic deformation of a ring-stiffened cylindrical shell in response to a nonaxisymmetric, exponentially decaying pressure load, is presented. The analogy between the ring-stiffened cylindrical shell and a rigid-plastic string-on-foundation with discrete plastic resisting elements is used to find closed-form solutions for the transient and final deformations of the shell. Dynamic equilibrium of the central bay of the shell and the adjacent ring-stiffeners results in an inhomogeneous wave equation with inhomogeneous boundary conditions for the string. The initia

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Garbacz, G., and L. Kyzioł. "Application of metric entropy for results interpretation of composite materials mechanical tests." Advances in Materials Science 17, no. 1 (2017): 70–81. http://dx.doi.org/10.1515/adms-2017-0006.

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Abstract In this paper the results of mechanical studies of the Aropol 536 composite on the epoxy-resin base are described. The aim of the studies was to measure elastic-plastic changes in the composite during its deformation. The obtained results were analyzed using Kolmogorov-Sinai metric entropy. The entropy was computed applying phase portraits reconstructed from a phase plane using delayed coordinates. Resolution of the particular experimental setup limits the number of the acquired data points, i.e., from several to tens of thousands of points and it has significant influence on accuracy

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Bakushev, S. V. "DIFFERENTIAL EQUATIONS OF EQUILIBRIUM OF ELASTIC PERFECTLY PLASTIC CONTINUOUS MEDIUM FOR PLANE DEFORMATION IN CYLINDRICAL COORDINATES AT BILINEAR APPROXIMATION OF THE CLOSING EQUATIONS." STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS, no. 1 (February 25, 2021): 18–33. http://dx.doi.org/10.37538/0039-2383.2021.1.18.33.

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Abstract. The article considers the construction of differential equations of equilibrium in displacements for plane deformation of elastic perfectly plastic regarding shear deformations continuous medium and nonlinearly elastic continuous medium with respect to volumetric deformations with bilinear approximation of the closing equations, both regarding and regardless geometrical nonlinearity in a cylindrical coordinate system. Nonlinear diagrams of volumetric and shear deformation are approximated by bilinear functions. Proceeding from the assumption of independence, generally speaking, of vo

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Gautam, Sachin, and Ravindra Saxena. "A finite element study on effect of frictional heating in the taylor rod impact problem." World Journal of Engineering 11, no. 6 (2014): 529–42. http://dx.doi.org/10.1260/1708-5284.11.6.529.

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In an impact phenomenon the material is subjected to very short duration high force levels resulting large plastic deformations and rise in temperature at high strain rates. A circular rod impacting against a rigid surface called as Taylor rod impact test is widely used for determining the mechanical behaviour of materials subjected to high strain rates with associated increase in temperature. A three-dimensional large deformation, thermo-elasto-plastic, dynamic, contact, finite element formulation is developed to study the effect of temperature rise due to plastic deformation and surface fric

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Luengo, Rita de Fátima Alves, Adonai Gimenez Calbo, and Angelo Pedro Jacomino. "Vegetable crops deformation assays for package height definition: a new approach." Ciência e Agrotecnologia 32, no. 1 (2008): 180–85. http://dx.doi.org/10.1590/s1413-70542008000100026.

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In the present work one determined the threshold pile height below which cracking and other deformations do not occur in products with low apparent density such as lettuce, collard greens and bell pepper. Initially the threshold pile height was sought applying decreasing compression stresses equivalent to pile loads of 160, 120 and 80 cm, with four replicates in four hour assays. The safe threshold pile height which protects the products against cracking rupture in these three commodities were of 80 cm. In a complementary study, plastic and elastic deformations induced by this safe pile thresh

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Kril, T. V., and I. A. Cherevko. "Risks of the soil foundations stability losses of the Kyiv-Pechersk Lavra Dormition Cathedral due to the urban activities." IOP Conference Series: Earth and Environmental Science 1415, no. 1 (2024): 012111. https://doi.org/10.1088/1755-1315/1415/1/012111.

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Abstract In the research, the use of numerical analysis of the soil foundations stability losses of Dormition Cathedral, where in the interiors of the II tier northern part, deformations of structural elements have been recorded since 2016, probably caused by uneven settlement of the foundations due to overmoistening. The initial data were the results of constant monitoring of the technical condition of the building, engineering and geological investigations, etc. To determine (confirm) the deformation factors and forecast their activation stabilization, a numerical calculation of the stress-d

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Gertsriken, D. S. "Effect of an Impulse Loading on Localization of Diffusing Atoms in Metals." Defect and Diffusion Forum 277 (April 2008): 91–97. http://dx.doi.org/10.4028/www.scientific.net/ddf.277.91.

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Distribution and mobility of own and impurity atoms in metals subjected to different loadings: quasi-static plastic strains; quasi-static deformations in combination with impulse; sluggish and fast elastic deformations, including alternating, impulse plastic strains are investigated by methods of an autoradiography, layer-by-layer radiometric analysis and secondary ionic mass spectrometry. The common regularities of migration of atoms at deformation of metals are found, and threshold values of a strain rate, corresponding to change of the diffusion mechanism and localization of penetrating ato

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Wan, Qiang, Li Ming Wei, Zhen Kai Zhou, and Yun Fei Li. "Dependence of Damage-Induced Magnetization on the Plastic Deformation for X80 Steel." Applied Mechanics and Materials 330 (June 2013): 106–11. http://dx.doi.org/10.4028/www.scientific.net/amm.330.106.

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Metal magnetic memory (MMM) method is a novel, passive magnetic method for inspecting mechanical degradation of ferromagnetic components. In this paper, the correlation between plastic deformation and the deformation-induced magnetic field was experimentally investigated for the X80 steel. Various tensile plastic deformations are introduced into test pieces with different initial discontinuities. The surface strain distributions and normal natural magnetic fields component are measured after the tensile testings. The results show that the normal natural magnetic fields component are effective

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Sinha, Bikash K., and Thomas J. Plona. "Wave propagation in rocks with elastic‐plastic deformations." GEOPHYSICS 66, no. 3 (2001): 772–85. http://dx.doi.org/10.1190/1.1444967.

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Wave propagation in rocks subject to elastic‐plastic deformations can be described by the equations of motion for small dynamic fields superposed on a static bias. The static bias refers to the statically deformed state of the material with large deformations. Referred to this statically deformed state, the Piola‐Kirchhoff stress equations of motion describe wave propagation in terms of second- and third‐order elastic constants, static stresses, and finite deformation gradients. Plane wave propagation along the principal stress directions can be described in terms of principal stretches, total

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Kabantsev, Oleg, and Karomatullo Umarov. "Features of Elastic-plastic Deformation of Reinforced Concrete Shear-wall Structures under Earthquake Excitations." Earthquake Engineering. Construction Safety, no. 1 (February 25, 2020): 18–28. http://dx.doi.org/10.37153/2618-9283-2020-1-18-28.

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The article provides the results of studies the process of formation and development of plastic deformations in reinforced concrete structures with shear-wall under earthquake excitations. The studies are carried out by numerical methods using nonlinear dynamic analysis. The results of the research shown: that in the shear-wall elements of reinforced concrete structures the level of plastic deformations should be significantly reduced in relation to the normative level of plastics in other structural elements of the carrier system. The completed studies substantiated the introduction of differ

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Khlybov, A. A., and A. L. Uglov. "On the acoustic method of control of spatial inhomogeneity of plastic deformation of weakly anisotropic orthotropic materials." Дефектоскопия, no. 1 (January 15, 2023): 25–36. http://dx.doi.org/10.31857/s0130308223010037.

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In this paper, the possibilities of using non-destructive acoustic control to determine the features of the spatial distribution of local plastic deformations during deformation of flat samples made of AMg61 alloy were investigated. The methodological features of using the acoustic anisotropy parameter to study the patterns of changes in spatial inhomogeneities of the field of local plastic deformations are analyzed. A computational and experimental method for determining the acoustic anisotropy parameter is proposed, which allows to correctly determine not only its magnitude, but also the dir

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Viktor, Bazhenov, and Vabischevich Maksim. "RESEARCH OF NONLINEAR DYNAMIC DEFORMATION OF SPATIAL BODIES WITH CRACKS." TECHNOLOGY AUDIT AND PRODUCTION RESERVES 2, no. 1(52) (2020): 16–18. https://doi.org/10.15587/2312-8372.2020.200550.

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<em>The object of research is the process of dynamic interaction of a complex system of cyclically symmetric parts of the support joint, taking into account the presence of stationary cracks. A significant number of structural elements and parts operated under dynamic loads are characterized by the occurrence and propagation of cracks in areas of significant plastic deformation. In particular, for the supporting device, it is a cyclically symmetric body with a limiting case of heterogeneity, under the action of pulsed loads, plastic flow zones arise at the boundaries of the joints of the cylin

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