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Journal articles on the topic 'Elastoplastic behavior'

Author: Grafiati

Published: 31 January 2023

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1

Sumarac, Dragoslav, Bojan Medjo, and Natasa Trisovic. "Hysteretic behavior modeling of elastoplastic materials." Theoretical and Applied Mechanics 35, no. 1-3 (2008): 287–304. http://dx.doi.org/10.2298/tam0803287s.

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In the present paper the Preisach model of hysteresis is applied to model cyclic behavior of elasto-plastic material. Rate of loading and viscous effects will not be considered. The problem of axial loading of rectangular cross section and cyclic bending of rectangular tube (box) will be studied in details. Hysteretic stress-strain loop for prescribed history of stress change is plotted for material modeled by series connection of three unite element. Also moment-curvature hysteretic loop is obtained for a prescribed curvature change of rectangular tube (box). One chapter of the paper is devoted to results obtained by FEM using Finite Element Code ABAQUS. All obtained results clearly show advantages of the Preisach model for describing cyclic behavior of elasto-plastic material.

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2

Gilat, Rivka, and Jacob Aboudi. "Behavior of Elastoplastic Auxetic Microstructural Arrays." Materials 6, no. 3 (February 28, 2013): 726–37. http://dx.doi.org/10.3390/ma6030726.

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3

Jiang, Xin, and Xiao Hang Liu. "Thermal Elastoplastic Behavior of Dispersion Nuclear Fuel Elements." Advanced Materials Research 339 (September 2011): 353–57. http://dx.doi.org/10.4028/www.scientific.net/amr.339.353.

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A representative volume element is chosen to act as the research object to analyze the thermal elastoplastic behavior of the dispersion fuel elements. The large strain elastoplastic analysis is carried out for the mechanicalbehaviors using FEM. The results indicate that with the volume fraction of the fuel particles increasing, the Mises stress and the equivalent plastic strain in the matrix increases, and the first principal stress and the equivalent plastic strain in the cladding increases markedly.

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4

Haghgoo, M., R. Ansari, MK Hassanzadeh-Aghdam, and A. Darvizeh. "Elastoplastic behavior of the metal matrix nanocomposites containing carbon nanotubes: A micromechanics-based analysis." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 4 (May 7, 2017): 676–86. http://dx.doi.org/10.1177/1464420717700927.

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The elastoplastic behavior of aluminum (Al) nanocomposites reinforced with aligned carbon nanotubes (CNTs) is characterized using a unit cell micromechanical model. The interphase zone caused by the chemical reaction between CNT and Al matrix is included in the analysis. To attain the elastoplastic stress–strain curve of the nanocomposites, the successive approximation method together with the von Mises yield criterion is employed. The effects of several important factors including the volume fraction and diameter of CNT, material properties, and size of interphase on the elastoplastic stress–strain curve of the nanocomposites during uniaxial tension are studied. The results indicate that the interphase characteristics significantly affect the elastoplastic behavior of the CNT-reinforced Al nanocomposites. It is also found that the yield stress of the nanocomposites rises with increasing CNT volume fraction or decreasing CNT diameter. Besides, the elastoplastic stress–strain curve of the CNT-reinforced Al nanocomposites is presented for multiaxial tension. The initial yield envelopes of the nanocomposites under longitudinal–transverse biaxial tension are provided too. Comparison between the elastic results of the present model with those of other available micromechanical analyses shows a very good agreement.

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5

Nelson, Richard B., and Alois Dorfmann. "Parallel Elastoplastic Models of Inelastic Material Behavior." Journal of Engineering Mechanics 121, no. 10 (October 1995): 1089–97. http://dx.doi.org/10.1061/(asce)0733-9399(1995)121:10(1089).

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6

Gamonpilas, Chaiwut, and Esteban P. Busso. "Characterization of Elastoplastic Properties Based on Inverse Analysis and Finite Element Modeling of Two Separate Indenters." Journal of Engineering Materials and Technology 129, no. 4 (December 15, 2006): 603–8. http://dx.doi.org/10.1115/1.2744428.

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A method that can determine uniquely the elastoplastic properties from indentation loading and unloading curves has been developed. It is based on finite element modeling and inverse analysis of two separate indenters. The approach was validated by numerical experiments using a fictitious material. It was demonstrated that the proposed method can uniquely recover the elastoplastic properties using only indentation load-displacement curves of two indenters. Although the proposed procedure has been used to predict elastoplastic strain hardening behavior, it is also applicable to estimate other mechanical properties where there are more than two unknown parameters, such as rate-dependent behavior.

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7

Overaker, D. W., A. M. Cuitin˜o, and N. A. Langrana. "Elastoplastic Micromechanical Modeling of Two-Dimensional Irregular Convex and Nonconvex (Re-entrant) Hexagonal Foams." Journal of Applied Mechanics 65, no. 3 (September 1, 1998): 748–57. http://dx.doi.org/10.1115/1.2789119.

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A nonlinear micromechanical model for two-dimensional irregular hexagonal foams has been developed that allows for anisotropy in morphology and/or material. Based upon the orientation, cross section, length, and material properties of each strut, the resulting microlevel beam behavior within the unit cell determines its structural properties. Nonlinearity is introduced as coupled elastoplastic beam behavior, where the elastoplastic behavior of each beam is considered. The analytical. formulation for the stiffness matrix of the general elastoplastic unit cell is. found by considering compatibility and equilibrium of the unit cell. The structural properties of the elastoplastic unit cell are embedded in a continuum finite element model as material properties, thus capturing the microstructure of the foam in an accurate and efficient model. Structural nonlinearity is therefore directly linked to localized plasticity and its evolution at the microlevel. Elastic analyses investigated the degree of anisotropy in structural properties that was induced by various morphological changes. The differences in stress and deformation behavior between a regular hexagonal foam and a re-entrant foam were also demonstrated. Plastic analyses showed how structural nonlinearity could be explained by localized microstructural behavior. The advantage of this micromechanical model is that it allows a study of the effects of morphology and/or material anisotropies on the overall foam behavior.

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8

Wu, Y., and JW Ju. "Elastoplastic damage micromechanics for continuous fiber-reinforced ductile matrix composites with progressive fiber breakage." International Journal of Damage Mechanics 26, no. 1 (July 28, 2016): 4–28. http://dx.doi.org/10.1177/1056789516655671.

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An elastoplastic damage micromechanical framework considering evolutionary fiber breakage is proposed to predict the overall material behaviors of continuous fiber-reinforced composites with ductile matrix under external loading. In the present work, we assume that the overall nonlinear behavior of a composite is primarily attributed to the plastic deformation in the matrix as well as the damage evolution due to fiber breakage. The effective elastoplastic deformations are governed by means of the effective yield surface derived from a representative microstructure with elastic fibers embedded in an elastoplastic matrix material. The matrix behaves elastically or plastically depending on the local stress, and the effective elastoplastic deformation obeys the associative plastic flow rule and isotropic hardening law. In addition, taking advantage of the eigenstrain due to fiber breakage together with a Weibull statistic model, the evolutionary fiber breakage mechanism is effectively predicted. Finally, the overall elastoplastic stress–strain responses are reached under the framework of micromechanics and damage mechanics. Comparisons between the proposed theoretical predictions and experimental data are performed to illustrate the capability of the proposed framework. In particular, the proposed model is employed to investigate the overall uniaxial and axisymmetric elastoplastic stress–strain responses of the continuous fiber-reinforced metal matrix composites. Studies of the initial yield surfaces at various damage levels are conducted as well.

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9

Shen, Min, Wen Liang Wang, Rui Xu, Jing Wei Tong, and Hong Xia Li. "Prediction of Orthotropic Mechanical Behaviors of Hot-Pressing Weft-Knitted Flax/PP Composites." Advanced Materials Research 287-290 (July 2011): 326–29. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.326.

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The orthotropic mechanical behaviors of weft-knitted flax fiber fabric reinforced polypropylene (PP) composites, which were produced by hot pressing of knit layers composed of a commingled yarn with a flax fiber content of 50vol.%, are investigated in both meso- and macro-scales. In meso-scale, the repeating unit cell (RUC) finite element (FE) model is developed, in which impregnated yarns are assumed to be isotropic elastic while the matrix is modeled as an elastoplastic, isotropic solid. Then, stress-strain curves of the RUC are simulated for its elastoplastic orthotropic parameters. Finally, in macro-scale of its specimen, the tensile behavior of the composite laminates with six parallel plies is simulated by means of 3D elastoplastic FE method. The applicability and limitation of this model have been discussed.

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10

Ju, J. W., and Tsung-Muh Chen. "Micromechanics and Effective Elastoplastic Behavior of Two-Phase Metal Matrix Composites." Journal of Engineering Materials and Technology 116, no. 3 (July 1, 1994): 310–18. http://dx.doi.org/10.1115/1.2904293.

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A micromechanical framework is presented to predict effective (overall) elasto-(visco-)plastic behavior of two-phase particle-reinforced metal matrix composites (PRMMC). In particular, the inclusion phase (particle) is assumed to be elastic and the matrix material is elasto-(visco-)plastic. Emanating from Ju and Chen’s (1994a,b) work on effective elastic properties of composites containing many randomly dispersed inhomogeneities, effective elastoplastic deformations and responses of PRMMC are estimated by means of the “effective yield criterion” derived micromechanically by considering effects due to elastic particles embedded in the elastoplastic matrix. The matrix material is elastic or plastic, depending on local stress and deformation, and obeys general plastic flow rule and hardening law. Arbitrary (general) loadings and unloadings are permitted in our framework through the elastic predictor-plastic corrector two-step operator splitting methodology. The proposed combined micromechanical and computational approach allows us to estimate overall elastoplastic responses of PRMMCs by accounting for the microstructural information (such as the spatial distribution and micro-geometry of particles), elastic properties of constituent phases, and the plastic behavior of the matrix-only materials. Comparison between our theoretical predictions and experimental data on uniaxial elastoplastic tests for PRMMCs is also presented to illustrate the capability of the proposed framework. A straightforward extension to accommodate viscoplastic matrix material is also presented to further enhance the applicability of the proposed method.

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11

Lee, Eun-Ho, and Tae-Hyun Kim. "Topology Optimization of Elastoplastic Behavior Conditions by Selectively Suppressing Plastic Work." Mathematics 8, no. 11 (November 19, 2020): 2062. http://dx.doi.org/10.3390/math8112062.

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This work conducted topology optimization with an implicit analysis of elastoplastic constitutive equation in order to design supporting structures for unexpected heavy loading conditions. In this topology optimization model, plastic work was extracted from strain energy and selectively employed in the objective function according to deformation mode. While strain energy was minimized in elastic deformation areas, in elastoplastic deformation areas, the plastic work was minimized for the purpose of suppressing plastic deformation. This method can focus on suppressing plastic strain in the plastic deformation zone with maintaining elastic stiffness in the elastic deformation zone. These formulations were implemented into MATLAB and applied to three optimization problems. The elastoplastic optimization results were compared to pure elastic design results. The comparison showed that structures designed with accounting for plastic deformation had a reinforced area where plastic deformation occurs. Finally, a finite element analysis was conducted to compare the mechanical performances of structures with respect to the design method.

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12

CHALLAMEL, NOËL. "DYNAMIC ANALYSIS OF ELASTOPLASTIC SHAKEDOWN OF STRUCTURES." International Journal of Structural Stability and Dynamics 05, no. 02 (June 2005): 259–78. http://dx.doi.org/10.1142/s0219455405001593.

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This paper deals with the dynamics of a single-degree-of-freedom elastoplastic oscillator. The model adopted herein is useful for understanding the dynamic behavior of civil engineering structures, such as steel structures, especially when plastic inelasticity is of concern. Using appropriate internal variables, the dynamic hysteretic system can be written as a singular autonomous system. The free vibration of such a nonlinear system reduces to periodic motion. The harmonic forced oscillator can exhibit periodic or quasi-periodic behaviors. A bifurcation diagram is numerically computed, which indicates that periodic elastoplastic limit cycles exist for some ranges of structural parameters. The bifurcation boundary separates the shakedown from other alternating plasticity phenomena.

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13

Jiang, Annan, Xiurong Yang, Mengfei Xu, and Tengfei Jiang. "Coupled Hydrologic-Mechanical-Damage Analysis and Its Application to Diversion Tunnels of Hydropower Station." Advances in Civil Engineering 2021 (February 24, 2021): 1–17. http://dx.doi.org/10.1155/2021/8341528.

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Since the traditional model cannot sufficiently reflect the multifield coupling problem, this paper established an elastoplastic stress-seepage-damage analysis model considering the seepage field, stress field, and damage field. Simultaneously, the elastoplastic damage model involves many parameters and is difficult to determine. An inverse analysis program is compiled based on the differential evolution algorithm, and the surrounding rock damage parameters are inverted. Finally, the elastoplastic stress-seepage-damage coupling program and the damage parameter displacement back analysis program is compiled using C++ language. Then, the program is used to calculate the coupling problem of tunnel elastoplastic stress-seepage-damage. The results show that the proposed elastoplastic damage constitutive model can well describe the mechanical behavior of rock. The computational procedure can also simulate practical engineering problems, which can provide specific guidance for site construction.

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14

Sun, Miao Miao, Hua Jian Fang, Shi Min Zhang, and Xiao Li Wan. "Study on Rheological Behavior of Undisturbed Soft Clay in Wenzhou Considering Structural Property." Applied Mechanics and Materials 614 (September 2014): 640–45. http://dx.doi.org/10.4028/www.scientific.net/amm.614.640.

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Based on boundary surface elastoplastic theory, a boundary surface elastoplastic constitutive model is established which is considered both structural property and rheological behavior of soft clay with the method of taking Cam-Clay yield surface as boundary surface. The structural parameters are introduced to calculate structure-damage strain. Plastic volumetric strain is regarded as a function timetso that a rheological parameter is introduced. The constitutive model is validated by numerical analysis of triaxial rheological tests.

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15

Alwis, W. A. M. "Nonuniqueness in Elastoplastic Frames." Journal of Applied Mechanics 59, no. 3 (September 1, 1992): 688–90. http://dx.doi.org/10.1115/1.2893784.

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Lack of uniqueness of the kinematic solution of elastoplastic flexural frames is studied by deriving a general solution for nonholonomic behavior. A singular hinge set is defined as a collection of plastic hinges that would form a mechanism if they were replaced by mechanical hinges. It is shown that whenever singular subsets can be found among active plastic hinges, the kinematic solution may become nonunique. The rate of work done by the load rates on the contributing mechanisms must be zero if a prevailing nonuniqueness is to sustain.

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16

Kamenskikh, A., and M. Bartolomey. "Analysis of Elastoplastic Behavior Model of Antifriction Polymers." Solid State Phenomena 284 (October 2018): 3–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.3.

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The analysis of properties of the antifriction materials suitable for use as materials of a surface of sliding of contact nodes was made and the elastoplastic model for the description of their behavior has been chosen in the work. The general mathematical statement of the problem of friction contact interaction of two elastic bodies through an elastoplastic antifriction layer taking into account all types of a contact state has been made. Check of mathematical statement within numerical realization of an experiment on uniaxial compression of a sample by press plates taking into account friction on the interfaced surfaces has been executed. Assessment of convergence of the numerical solution of the task of contact parameters depending on a number of nodal unknowns has been made, optimum finite element decomposition of the model has been chosen. It has been established that the numerical solution gives a good quantitative capability to results of a natural experiment. It has been established that all paths of deformation have small curvature in all considered points of the polymeric cylindrical sample.

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17

YANAGIDA, Nobuyoshi, Osamu WATANABE, Shigeo SAKURAI, and Hiroshi MIYATA. "Elastoplastic Behavior of Notched Plates under Cyclic Loading." Transactions of the Japan Society of Mechanical Engineers Series A 58, no. 547 (1992): 442–48. http://dx.doi.org/10.1299/kikaia.58.442.

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18

Muller, D., X. Lemoine, and M. Berveiller. "Nonlocal Behavior of Elastoplastic Metals: Theory and Results." Journal of Engineering Materials and Technology 116, no. 3 (July 1, 1994): 378–83. http://dx.doi.org/10.1115/1.2904301.

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In this paper, a nonlocal theory based upon crystalline plasticity is used in case of a dislocation cell structure induced during plastic straining and represented by a two-phase material. By describing convective dislocation motion (which appears to be a basic feature of hardening) and storage mechanisms, under some simplifying assumptions, numerical simulations exhibit significant effects on the intragranular heterogeneization, as well as on global results like the Bauschinger effect.

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19

van Rens, B. J. E., W. A. M. Brekelmans, and F. P. T. Baaijens. "Homogenization of the elastoplastic behavior of perforated plates." Computers & Structures 69, no. 4 (November 1998): 537–45. http://dx.doi.org/10.1016/s0045-7949(98)00120-5.

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20

Jiang, M., I. Jasiuk, and M. Ostoja-Starzewski. "Apparent elastic and elastoplastic behavior of periodic composites." International Journal of Solids and Structures 39, no. 1 (January 2002): 199–212. http://dx.doi.org/10.1016/s0020-7683(01)00145-7.

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21

Chiarelli, A. S., J. F. Shao, and N. Hoteit. "Modeling of elastoplastic damage behavior of a claystone." International Journal of Plasticity 19, no. 1 (January 2003): 23–45. http://dx.doi.org/10.1016/s0749-6419(01)00017-1.

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22

Latourte, F., A. Chrysochoos, S. Pagano, and B. Wattrisse. "Elastoplastic Behavior Identification for Heterogeneous Loadings and Materials." Experimental Mechanics 48, no. 4 (October 13, 2007): 435–49. http://dx.doi.org/10.1007/s11340-007-9088-y.

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23

Temis, Y. M., K. K. Azmetov, and A. I. Fakeev. "MODEL OF ELASTOPLASTIC BEHAVIOR OF STRUCTURE MATERIALS AT THERMOCYCLIC LOADING." Izvestiya MGTU MAMI 6, no. 1 (January 10, 2012): 255–60. http://dx.doi.org/10.17816/2074-0530-70029.

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Based on behavior of structural materials under non-isothermal cyclic elastoplastic deformation the authors established a system of mathematical modeling of cyclic loading of structures using finite elements and self-correcting method.

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24

Han, Tong-Seok, and Sang-Yeop Chung. "NM-KR-4 Effect of Intergranular Misorientation on Behavior of Polycrystalline Solids during Elastoplastic Deformation." Proceedings of Mechanical Engineering Congress, Japan 2012 (2012): _NM—KR—4–1—_NM—KR—4–2. http://dx.doi.org/10.1299/jsmemecj.2012._nm-kr-4-1.

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25

Li, Haoran, Yajun Zhang, Hongwu Yin, Xinlei Wang, Weigang Zhao, and Wenjiang Li. "Development of Transversely Isotropic Elastoplastic Constitutive Model in FLAC3D and Its Application in Tunnel Engineering." Geofluids 2022 (August 9, 2022): 1–15. http://dx.doi.org/10.1155/2022/3264675.

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The obvious anisotropy of layered rock mass prevents the built-in constitutive model of commercial simulation software from accurately describing the elastoplastic behavior of the rock mass. In this paper, a transversely isotropic elastoplastic constitutive model (called the AN-MC model) that characterizes the elastoplastic failure behavior of the layered rock mass is developed by introducing the Mohr-Coulomb yield criterion with the tension cutoff in the model based on the transversely isotropic constitutive model and deriving its finite difference scheme. The development and programming of the transversely isotropic elastoplastic constitutive model are achieved on the basis of the secondary development platform of FLAC3D and the VC++ environment. The accuracy and rationality of the proposed constitutive model are verified in terms of consistency of the calculation results of the developed transversely isotropic elastoplastic constitutive model and the built-in constitutive models. In the numerical analysis of the Queerxi tunnel project, the calculation results of the AN-MC model are in good agreement with the field monitoring data. Thus, the deformation characteristics of the tunnel surrounding rock are well characterized. Comparative analysis of the deformation and failure laws of the layered surrounding rock and isotropic surrounding rock indicates that the plastic failure range of the layered surrounding rock tunnel is larger, and the arch foot and waist are prone to plastic penetration failure with butterfly-shaped characteristics. The research results are important for the scientific prediction and precise support of layered rock mass deformation.

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26

Nie, Guo Jun, and Zheng Zhong. "Analytical Solution for Elastic and Elastoplastic Bending of a Curved Beam Composed of Inhomogeneous Materials." Key Engineering Materials 535-536 (January 2013): 353–56. http://dx.doi.org/10.4028/www.scientific.net/kem.535-536.353.

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We present an analytical solution for elastic and elastoplastic bending problem of a curved beam composed of inhomogeneous materials. Suppose the material is isotropic, ideally elastoplastic and it obeys Tresca’s yield criterion and the corresponding associated flow rule. And the elastic modulus and yield limit of the material vary radially according to general power functions. The expressions of stresses and displacements of a curved beam in both purely elastic stress state and partially plastic stress state are derived. The influence of material inhomogeneity on the elastoplastic behavior of a curved beam is demonstrated in numerical examples. Analytical solutions presented here can serve as benchmark results for evaluating numerical solutions.

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27

Zhang, Yu, Lu Wang, Goangseup Zi, and Yan Zhang. "Mechanical Behavior of Coupled Elastoplastic Damage of Clastic Sandstone of Different Burial Depths." Energies 13, no. 7 (April 2, 2020): 1640. http://dx.doi.org/10.3390/en13071640.

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Clastic sandstone is widely distributed in oil and gas reservoirs; its internal structure has many micro-defects. Under different stress environments of burial depth, significant damage evolution and plastic deformation easily occur. A series of triaxial compression tests were performed to study the coupled elastoplastic damage mechanical behavior of clastic sandstone samples at different burial depths ranging from 581.28 m to 979.82 m. Results reveal that the stress-strain responses of clastic sandstone samples exhibit significant nonlinear and softening characteristics. The mechanical behavior is due to the coupling of plastic deformation and mechanical damage. Plastic and damage internal variables cause damage stiffness degradation and plastic flow. Considering the coupling of elastoplastic damage in the loading process, an elastoplastic damage coupling model is proposed to study the mechanical behavior of different burial depth clastic sandstones. The model can effectively describe the mechanical behavior of clastic sandstone, such as the volume compression and dilatancy transformation, plastic hardening and damage softening, which are in good agreement with the experimental results. Furthermore, the mechanical behavior of the clastic sandstone shows a dependency on the confining pressure and burial depth. The load-bearing capacity and the ability to resist deformation of the clastic sandstone are improved as the confining pressure and burial depth increase. Relevant results can provide reliable basis for the safe exploitation of oil and gas engineering.

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28

Fajoui, Jamal, David Gloaguen, Amel Alimi, Mohamed Kchaou, Frédéric Jacquemin, and Riadh Elleuch. "New Modelling Approach for Micromechanical Modelling of the Elastoplastic Behaviour." Advanced Materials Research 996 (August 2014): 112–17. http://dx.doi.org/10.4028/www.scientific.net/amr.996.112.

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A new theoretical approach is developed to simulate the elastoplastic behaviour in cubic alloys during various strain-path changes. The polycristal is considered as a composite consisting of hard dislocation walls of high local dislocation density which are separated by soft regions of low local dislocation density. The improved elasto-plastic self-consistent method is applied to deduce the global behaviour of the aggregate. The model is tested by simulating the macroscopic behavior and the development of intergranular strains during different complex loads.

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29

Erisov, Yaroslav A. "Mathematical Model of Anisotropic Elastoplastic Material." Key Engineering Materials 684 (February 2016): 127–33. http://dx.doi.org/10.4028/www.scientific.net/kem.684.127.

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The work considers some techniques for defining the stress state during computer modelling of metal-forming processes. A mathematical model of anisotropic elastoplastic material has been developed and an algorithm of computing the stress-strain behavior according to this model has been described.

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30

Chen, Chongfeng. "A Constitutive Model of Time-Dependent Deformation Behavior for Sandstone." Materials 16, no. 1 (December 23, 2022): 135. http://dx.doi.org/10.3390/ma16010135.

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Considering sandstone’s heterogeneity in the mesoscale and homogeneity in the macroscale, it is very difficult to describe its time-dependent behavior under stress. The mesoscale heterogeneity can affect the initiation and propagation of cracks. Clusters of cracks have a strong influence on the formation of macroscale fractures. In order to investigate the influence of crack evolution on the formation of fractures during creep deformation, a time-dependent damage model is introduced in this paper. First, the instantaneous elastoplastic damage model of sandstone was built based on the elastoplastic theory of rock and the micro-heterogeneous characteristics of sandstone. A viscoelastic plastic creep damage model was established by combining the Nishihara model and the elastoplastic damage constitutive model. The proposed models have been validated by the results of corresponding analytical solutions. To help back up the model, some conventional constant strain rate tests and multi-step creep tests were carried out to analyze the time-dependent behavior of sandstone. The results show that the proposed damage model can not only reflect the time-dependent viscoelastic deformation characteristics of sandstone, but also provide a good fit to the viscoelastic plastic deformation characteristics of sandstone’s creep behavior. The damage model can also reproduce the propagation process of mesoscopic cracks in sandstone upon the damage and failure of micro-units. This research can provide an effective tool for studying the propagation of microscopic cracks in sandstone.

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31

Ko, YF, and JW Ju. "Effects of fiber cracking on elastoplastic-damage behavior of fiber-reinforced metal matrix composites." International Journal of Damage Mechanics 22, no. 1 (January 9, 2012): 48–67. http://dx.doi.org/10.1177/1056789511433340.

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A micromechanical multi-level elastoplastic evolutionary damage framework is proposed to predict the overall transverse mechanical behavior and damage evolutions of cylindrical fiber-reinforced ductile composites. Progressively cracked fibers are modeled using the double-inclusion theory. The effective elastic moduli of three-phase composites, consisting of a matrix, randomly located yet monotonically aligned cylindrical uncracked fibers and cracked fibers, are derived by using a micromechanical formulation. In order to characterize the homogenized elastoplastic behavior, a micromechanical effective yield criterion is derived based on the ensemble-area averaging process and the first-order effects of eigenstrains. The resulting effective yield criterion, together with the overall associative plastic flow rule and the hardening law, constitutes the analytical framework for the estimation of effective transverse elastoplastic-damage responses of ductile composites containing both uncracked and cracked fibers. An evolutionary fiber cracking process, governed by the internal stresses and the fracture strength of fibers, is incorporated into the proposed work. The Weibull’s probabilistic distribution is employed to describe the varying probability of fiber cracking. Further, systematic numerical simulations are presented to illustrate the potential of the proposed methodology.

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32

Shoaib, M., and L. Kari. "Discrete Element Simulation of Elastoplastic Shock Wave Propagation in Spherical Particles." Advances in Acoustics and Vibration 2011 (August 9, 2011): 1–9. http://dx.doi.org/10.1155/2011/123695.

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Elastoplastic shock wave propagation in a one-dimensional assembly of spherical metal particles is presented by extending well-established quasistatic compaction models. The compaction process is modeled by a discrete element method while using elastic and plastic loading, elastic unloading, and adhesion at contacts with typical dynamic loading parameters. Of particular interest is to study the development of the elastoplastic shock wave, its propagation, and reflection during entire loading process. Simulation results yield information on contact behavior, velocity, and deformation of particles during dynamic loading. Effects of shock wave propagation on loading parameters are also discussed. The elastoplastic shock propagation in granular material has many practical applications including the high-velocity compaction of particulate material.

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33

Wan, Zheng, Chenchen Song, Songtao Xue, and Liyu Xie. "Elastoplastic Constitutive Model Describing Dilatancy Behavior of Overconsolidated Clay." International Journal of Geomechanics 21, no. 3 (March 2021): 04021008. http://dx.doi.org/10.1061/(asce)gm.1943-5622.0001947.

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34

Li, Runfang. "Elastoplastic contact behavior and shape optimization of drillpipe thread." Chinese Journal of Mechanical Engineering (English Edition) 14, no. 01 (2001): 78. http://dx.doi.org/10.3901/cjme.2001.01.078.

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35

Chembarisova, R. G. "Elastoplastic behavior of copper upon high-strain-rate deformation." Physics of Metals and Metallography 116, no. 6 (June 2015): 592–600. http://dx.doi.org/10.1134/s0031918x15040043.

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36

Sancaktar, Erol, Hooshang Jozavi, Joseph Baldwin, and Jing Tang. "Elastoplastic Fracture Behavior of Structural Adhesives Under Monotonic Loading." Journal of Adhesion 23, no. 4 (December 1987): 233–62. http://dx.doi.org/10.1080/00218468708075409.

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Ghasemzadeh, H., M. H. Sojoudi, S. A. Ghoreishian Amiri, and M. H. Karami. "Elastoplastic model for hydro-mechanical behavior of unsaturated soils." Soils and Foundations 57, no. 3 (June 2017): 371–83. http://dx.doi.org/10.1016/j.sandf.2017.05.005.

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LU, Wei, and Yoshihiro TOMITA. "Evaluation of Micromechanical Behavior of Elastoplastic Particle-blended Polymer." Proceedings of Conference of Kansai Branch 2003.78 (2003): _5–29_—_5–30_. http://dx.doi.org/10.1299/jsmekansai.2003.78._5-29_.

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Jiang, T., J. F. Shao, and W. Y. Xu. "A micromechanical analysis of elastoplastic behavior of porous materials." Mechanics Research Communications 38, no. 6 (September 2011): 437–42. http://dx.doi.org/10.1016/j.mechrescom.2011.05.011.

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Ami Saada, R., G. Bonnet, and D. Bouvard. "Thermomechanical behavior of casting sands: Experiments and elastoplastic modeling." International Journal of Plasticity 12, no. 3 (January 1996): 273–94. http://dx.doi.org/10.1016/s0749-6419(96)00008-3.

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Six, V., H. Mroueh, I. Shahrour, and M. Bouassida. "Numerical Analysis of Elastoplastic Behavior of Stone Column Foundation." Geotechnical and Geological Engineering 30, no. 4 (March 1, 2012): 813–25. http://dx.doi.org/10.1007/s10706-012-9500-y.

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Myagkov, N. N. "Interaction of nonlinear waves in materials with elastoplastic behavior." Journal of Applied Mechanics and Technical Physics 35, no. 2 (March 1994): 246–56. http://dx.doi.org/10.1007/bf02369182.

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Wang, Yanchao, and ZhengMing Huang. "Analytical Micromechanics Models for Elastoplastic Behavior of Long Fibrous Composites: A Critical Review and Comparative Study." Materials 11, no. 10 (October 9, 2018): 1919. http://dx.doi.org/10.3390/ma11101919.

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Elasto-plastic models for composites can be classified into three categories in terms of a length scale, i.e., macro scale, meso scale, and micro scale (micromechanics) models. In general, a so-called multi-scale model is a combination of those at various length scales with a micromechanics one as the foundation. In this paper, a critical review is made for the elastoplastic models at the micro scale, and a comparative study is carried out on most popular analytical micromechanics models for the elastoplastic behavior of long fibrous composites subjected to a static load, meaning that creep and dynamic response are not concerned. Each model has been developed essentially following three steps, i.e., an elastic homogenization, a rule to define the yielding of a constituent phase, and a linearization for the elastoplastic response. The comparison is made for all of the three aspects. Effects of other issues, such as the stress field fluctuation induced by a high contrast heterogeneity, the stress concentration factors in the matrix, and the different approaches to a plastic Eshelby tensor, are addressed as well. Correlation of the predictions by different models with available experimental data is shown.

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Sakai, Mototsugu. "Substrate-affected indentation contact parameters of elastoplastic coating/substrate composites." Journal of Materials Research 24, no. 3 (March 2009): 831–43. http://dx.doi.org/10.1557/jmr.2009.0102.

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In coating/substrate bilayer systems, the indentation contact behavior transitionally varies from coatinglike to substratelike behaviors. Spatial confinement effects of the substrate induce very complicated plastic flows in the coating beneath the indenter, leading to a crucial difficulty that is not accounted for by any of the present quantitative analytical/theoretical predictions for the substrate-affected contact hardness. In this work, the author presents finite-element-based studies on the elastoplastic indentation contact mechanics of coating/substrate systems. The effect of the substrate is taken into account by introducing the spatially variable elastic modulus and the yield stress; this approach quantitatively describes the substrate-affected stress/strain field in the spatially localized area beneath the indenter. The elastoplastic constitutive relationship of the contact hardness for semi-infinite homogeneous bulks combined with these spatially variable material characteristics are successfully applied to analytically as well as quantitatively predict the substrate-affected contact hardness of bilayer composite systems having wide ranges of elastoplastic coating/substrate characteristics. The experimental procedures for determining the elastic/plastic parameters both of the coating and the substrate are also discussed, in which the importance of the experimental determination of substrate-affected indentation contact radius/area is emphasized.

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Eyüpgiller, Mustafa Mert, Melih Birhan Kenanoğlu, Mehmet Barış Can Ülker, and Nabi Kartal Toker. "A constitutive model for hydromechanically coupled behavior of unsaturated soils with hydraulic hysteresis." MATEC Web of Conferences 337 (2021): 02009. http://dx.doi.org/10.1051/matecconf/202133702009.

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There are several constitutive models developed for understanding coupled hydromechanical behavior of three phase medium of unsaturated soils as well as models for explaining hydraulic hysteresis in water retention. However, very few attempts that merge the two aspects of behavior are available. This study develops a one-way coupled model for understanding the hydromechanical behavior of unsaturated soils. In addition to the hysteresis between main drying and wetting retention curves, the model considers non-uniqueness of retention behavior resulting from void ratio changes due to compression under the stress application. As for the elastoplastic stress strain relationship of soil skeleton, the model is based on the formulation of classical plasticity relying on the critical state concept. Consequently, volumetric deformation due to wetting-drying cycles and its effect on elastoplastic behavior through simultaneously changing matric suction is modeled. Model results are calibrated with the results of isotropic compression stages of triaxial tests at both constant suction and constant water content conditions.

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Liu, Jun, and Gao Lin. "An Elastoplastic-anisotropic Damage Model for Concrete." Advanced Materials Research 261-263 (May 2011): 371–75. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.371.

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An elastoplastic-anisotropic damage constitutive model for the description of nonlinear behavior of concrete is presented. The yield surface is developed in effective stress spaces, which takes into account the hardening effect and better match the experimental data. The stiffness degradation and softening effect are considered in the framework of continuum damage mechanics formulation. The second-order damage tensor is used to characterize the anisotropy induced by the orientation of microcracks. In order to simulate the unilateral effect, the elastic Helmholtz free energy is decomposed into a volumetric part and a deviatoric part. The different behavior under tensile and compressive loadings is modeled by using different variables in effective stress and damage tensor. Numerical results of the model accord well with experimental results at the material and structural levels.

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ABDALLA, W. S., S. S. ALI-ELDIN, and M. R. GHAZY. "ADAPTIVE INCREMENTAL FINITE ELEMENT PROCEDURE FOR SOLVING ELASTOPLASTIC FRICTIONAL CONTACT PROBLEMS SUBJECTED TO NORMAL AND TANGENTIAL LOADS." International Journal of Applied Mechanics 06, no. 03 (May 6, 2014): 1450031. http://dx.doi.org/10.1142/s1758825114500318.

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This paper presents a numerical model for analyzing the stresses and displacements of deformable bodies in contact with the presence of friction and material nonlinearity. Based on the finite element method (FEM), the elastoplastic frictional contact problem is formulated as an incremental convex programming model (ICPM) under inequality contact constraints and friction conditions. The classical Coulomb's friction law and the Prandtl–Reuss flow rule with the von Mises yield criterion are used to simulate the interface friction conditions and the elastoplastic behavior of the contacting bodies, respectively. The Lagrange multiplier approach is adopted for imposing the contact constraints. Furthermore, an effective adaptive incremental procedure is developed for solving the elastoplastic frictional contact problems. Examples for the frictional contact having advancing and receding nature are analyzed. The obtained results prove the ability of the developed procedure to investigate the sequence of different events during monotonic application of external loads. In addition, the results elucidate the effect of external side force on the friction behavior in the presence of plastic deformation. Good agreement has been found with published results.

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HAJIAZIZI, M., and M. R. ASHORY. "APPLICATION OF POINT INTERPOLATION METHOD IN JOINTED ROCK MASS." International Journal of Computational Methods 08, no. 01 (March 2011): 41–55. http://dx.doi.org/10.1142/s0219876211002320.

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In this paper, point interpolation method (PIM) is applied to analyze the nonlinear and elastoplastic behavior of jointed rock masses. PIM is advantageous over the other meshless methods that are based on moving least square (MLS) technique. On the other hand in this study, element-free Galerkin method (EFGM) has been applied to analyze a jointed rock mass for comparison purposes. The domain of jointed rock mass is represented by a set of arbitrary distributed nodes. The essential boundary conditions are imposed in EFGM using penalty method. Mohr–Coulomb failure criterion is used for analyzing the behavior of joint failure. Two numerical examples are considered to demonstrate the effectiveness of method in predicting the elastoplastic behavior of jointed rock mass. The results are compared with those of finite difference method (FDM).

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Sakai, M., T. Akatsu, S. Numata, and K. Matsuda. "Linear strain hardening in elastoplastic indentation contact." Journal of Materials Research 18, no. 9 (September 2003): 2087–96. http://dx.doi.org/10.1557/jmr.2003.0293.

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Finite-element analyses for elastoplastic cone indentations were conducted in which the effect of linear strain hardening on indentation behavior was intensively examined in relation to the influences of the frictional coefficient (μ) at the indenter/material contact interface and of the inclined face angle (β) of the cone indenter. A novel procedure of “graphical superposition” was proposed to determine the representative yield stress YR. It was confirmed that the concept of YR applied to elastic-perfectlyplastic solids is sufficient enough for describing the indentation behavior of strainhardening elastoplastic solids. The representative plastic strain of εR (plastic) ≈ 0.22 tan β, at which YR is prescribed, is applicable to the strain-hardening elastoplastic solids, affording a quantitative relationship of YR = Y + ε;R (plastic) × EP in terms of the strain-hardening modulus EP. The true hardness H as a measure for plasticity is estimated from the Meyer hardness HM and then successfully related to the yield stress Y as H = C(β,μ) × Y for elastic-perfectly-plastic solids and as H = C(β,μ) × YR for strain-hardening solids, by the use of a β- and μ-dependent constraint factor C(β,μ) ranging from 2.6 to 3.2.

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Liu, Ling, Nagahisa Ogasawara, Norimasa Chiba, and Xi Chen. "Can indentation technique measure unique elastoplastic properties?" Journal of Materials Research 24, no. 3 (March 2009): 784–800. http://dx.doi.org/10.1557/jmr.2009.0100.

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Indentation is widely used to extract material elastoplastic properties from measured force-displacement curves. Many previous studies argued or implied that such a measurement is unique and the whole material stress-strain curve can be measured. Here we show that first, for a given indenter geometry, the indentation test cannot effectively probe material plastic behavior beyond a critical strain, and thus the solution of the reverse analysis of the indentation force-displacement curve is nonunique beyond such a critical strain. Secondly, even within the critical strain, pairs of mystical materials can exist that have essentially identical indentation responses (with differences below the resolution of published indentation techniques) even when the indenter angle is varied over a large range. Thus, fundamental elastoplastic behaviors, such as the yield stress and work hardening properties (functions), cannot be uniquely determined from the force-displacement curves of indentation analyses (including both plural sharp indentation and deep spherical indentation). Explicit algorithms of deriving the mystical materials are established, and we qualitatively correlate the sharp and spherical indentation analyses through the use of critical strain. The theoretical study in this paper addresses important questions of the application range, limitations, and uniqueness of the indentation test, as well as providing useful guidelines to properly use the indentation technique to measure material constitutive properties.

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