Thematische Bibliographien / Elastoplastic matrix

Auswahl der wissenschaftlichen Literatur zum Thema „Elastoplastic matrix“

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Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Elastoplastic matrix"

Wu, Y., und JW Ju. „Elastoplastic damage micromechanics for continuous fiber-reinforced ductile matrix composites with progressive fiber breakage“. International Journal of Damage Mechanics 26, Nr. 1 (28.07.2016): 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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Buryachenko, V. A., F. G. Rammerstorfer und A. F. Plankensteiner. „A Local Theory of Elastoplastic Deformation of Two-Phase Metal Matrix Random Structure Composites“. Journal of Applied Mechanics 69, Nr. 4 (20.06.2002): 489–96. http://dx.doi.org/10.1115/1.1479697.

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A two-phase material is considered, which consists of a homogeneous elastoplastic matrix containing a homogeneous statistically uniform random set of ellipsoidal inclusions with the same form, orientation, and mechanical properties. The multiparticle effective field method (used in this paper) in the original form assumes constant plastic strains in the matrix. This assumption is replaced by the following micromechanical model: Each inclusion consists of an elastic core and a thin coating. The mechanical properties of both the matrix and the coating are the same but with different plastic strains. Homogeneous plastic strains are assumed inside the matrix and in each of separate subdomains of the coating. A general theory of plasticity is developed for arbitrary loading based on incremental elastoplastic analysis. The consideration of inhomogeneity of plastic strains in the coating enables to obtain some principally new effects of elastoplastic deformation.

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Ju, J. W., und Tsung-Muh Chen. „Micromechanics and Effective Elastoplastic Behavior of Two-Phase Metal Matrix Composites“. Journal of Engineering Materials and Technology 116, Nr. 3 (01.07.1994): 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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Haghgoo, M., R. Ansari, MK Hassanzadeh-Aghdam und 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, Nr. 4 (07.05.2017): 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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Ju, J. W., und K. H. Tseng. „Effective Elastoplastic Algorithms for Ductile Matrix Composites“. Journal of Engineering Mechanics 123, Nr. 3 (März 1997): 260–66. http://dx.doi.org/10.1061/(asce)0733-9399(1997)123:3(260).

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TANG, HONGXIANG, ZHAOLONG HU und XIKUI LI. „THREE-DIMENSIONAL PRESSURE-DEPENDENT ELASTOPLASTIC COSSERAT CONTINUUM MODEL AND FINITE ELEMENT SIMULATION OF STRAIN LOCALIZATION“. International Journal of Applied Mechanics 05, Nr. 03 (September 2013): 1350030. http://dx.doi.org/10.1142/s1758825113500300.

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A pressure-dependent elastoplastic Cosserat continuum model for three-dimensional problems is presented in this paper. The nonassociated Drucker–Prager yield criterion is particularly considered. Splitting the scalar product of the stress rate and the strain rate into the deviatoric and the spherical parts, the consistent algorithm of the pressure-dependent elastoplastic model is derived in the three-dimensional framework of Cosserat continuum theory, i.e., the return mapping algorithm for the integration of the rate constitutive equation and the closed form of the consistent elastoplastic tangent modulus matrix. The matrix inverse operation usually required in the calculation of elastoplastic tangent constitutive modulus matrix is avoided, that ensures the second order convergence rate and the computational efficiency of the model in numerical solution procedure. A comparison is performed between the classical and Cosserat continuum model through the numerical results of three-dimensional shear structure, tensile specimen, footing on a soil foundation, and soil slope stability. It illustrates that mesh dependency and numerical difficulties exist in classical model, while Cosserat model possesses the capability and performance in keeping the well-posedness of the boundary value problems with strain softening behavior incorporated. The relationship between the internal length scale and the width of shear band and the load-carrying capability of the structure has also been demonstrated.

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He, Guanqiang, Hu Wang, Guangxin Huang, Haitao Liu und Guangyao Li. „A Parallel Elastoplastic Reanalysis Based on GPU Platform“. International Journal of Computational Methods 14, Nr. 05 (November 2016): 1750051. http://dx.doi.org/10.1142/s0219876217500517.

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An efficient parallel elastoplastic reanalysis method is suggested. The main backbone of the suggested method is based on combined approximation (CA) reanalysis. GPU parallel computation is used to accelerate assembling the stiffness matrix. Assembling process is divided into the offline part for strain matrix and online part for element stiffness matrix, which makes the structure of the program more reasonable and efficient. Pseudo elastic analysis is introduced and extended to load increment method to make the CA method more feasible. The numerical examples show that the suggested method can improve the efficiency of elastoplastic analysis significantly and the accuracy of results can also be ensured.

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HUANG, ZHUPING, YONGQIANG CHEN und SHU-LIN BAI. „AN ELASTOPLASTIC CONSTITUTIVE MODEL FOR POROUS MATERIALS“. International Journal of Applied Mechanics 05, Nr. 03 (September 2013): 1350035. http://dx.doi.org/10.1142/s175882511350035x.

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A micromechanics-based elastoplastic constitutive model for porous materials is proposed. With an assumption of modified three-dimensional Ramberg–Osgood equation for the compressible matrix material, the variational principle based on a linear comparison composite is applied to study the effective mechanical properties of the porous materials. Analytical expressions of elastoplastic constitutive relations are derived by means of micromechanics principles and homogenization procedures. It is demonstrated that the derived expressions do not involve any additional material constants to be fitted with experimental data. The model can be useful in the prediction of mechanical properties of elastoplastic porous solids.

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Sun, L. Z., und J. W. Ju. „Elastoplastic Modeling of Metal Matrix Composites Containing Randomly Located and Oriented Spheroidal Particles“. Journal of Applied Mechanics 71, Nr. 6 (01.11.2004): 774–85. http://dx.doi.org/10.1115/1.1794699.

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Micromechanics-based effective elastic and plastic formulations of metal matrix composites (MMCs) containing randomly located and randomly oriented particles are developed. The averaging process over all orientations upon three elastic governing equations for aligned particle-reinforced MMCs is performed to obtain the explicit formulation of effective elastic stiffness of MMCs with randomly oriented particles. The effects of volume fraction of particles and particle shape on the overall elastic constants are studied. Comparisons with the Hashin-Shtrikman bounds and Ponte Castaneda-Willis bounds show that the present effective elastic formulation does not violate the variational bounds. Good agreement with experimental elastic stiffness data is also illustrated. Furthermore, the orientational averaging procedure is employed to derive the overall elastoplastic yield function for the MMCs. Elastoplastic constitutive relations for the composites are constructed on the basis of the derived composite yield function. The stress-strain responses of MMCs under the axisymmetric loading are also investigated in detail. Finally, elastoplastic comparisons with the experimental data for SiCp/Al composites are performed to illustrate the capability of the proposed formulation.

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Potapov, Alexander N. „ABOUT THE FREE-VIBRATION MODE SHAPES OF ELASTOPLASTIC DISSIPATIVE SYSTEMS“. International Journal for Computational Civil and Structural Engineering 14, Nr. 3 (28.09.2018): 114–25. http://dx.doi.org/10.22337/2587-9618-2018-14-3-114-125.

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The author presents the conditions of the generalized orthogonality of the free-vibration mode shapes of an elastic dissipative system, for which traditional classical orthogonality conditions are a private case. As opposed to these conditions, the above ratios contain the mass matrix, the damping matrix, and the diagonal form of the spectral characteristics (damping coefficients and mode-shape frequencies). Within the theory of time analysis, free-vibration mode shapes of an elastoplastic system are built on the basis of using a schematized diagram of strain with hardening. The author proposes a design scheme that reduces the process of nonlinear vibrations to a sequence of processes flowing according to a linear scenario within the time intervals called quasilinear. In these intervals, the parameters of the dynamic model (elements of the stiffness matrix and the damping matrix) remain unchanged, all the changes occur only when passing through the critical points. As a result, the author formulated the condition for the nondegenerate state of an elastoplastic dissipative system. According to the condition, local plastic zones characterized by the size, the number and location of the zones on the design scheme of the structure correspond to each quasilinear interval. Since within the intervals, the parameters of the plastic zones are unchanged, the conditions of the generalized orthogonality of the mode shapes of the elastoplastic system are satisfied by analogy with the vibration mode shapes of an elastic dissipative system. The free-vibration motion of a hinged beam with three degrees of freedom are analyzed taking into account local plastic zones with different lengths and the location of zones in different nodes. It is shown that the configuration of the forms of elastoplastic oscillations differs qualitatively from the configuration of the corresponding forms of elastic vibrations.

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Dissertationen zum Thema "Elastoplastic matrix"

Shi, Yue. „Micro-mechanics-based models of monotonic and cyclic behaviors of quasi-brittle rock-like materials having an elasto-viscoplastic matrix with microcracks“. Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDENGSYS/2023/2023ULILN057.pdf.

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L'objectif principal de cette thèse est de modéliser le comportement mécanique macroscopique des géomatériaux dans des conditions de chargement instantané et dépendant du temps. Dans ce contexte, le matériau étudié est modélisé du point de vue de la microstructure en utilisant des schémas de localisation et d'homogénéisation bien adaptés. À l'échelle microscopique, on suppose que les microfissures ont une morphologie en forme de penny et qu'elles sont intégrées de manière aléatoire dans une matrice solide isotrope. Dans le cadre de la thermodynamique, deux variables internes, la déformation inélastique et les dommages induits par les microfissures, sont toutes deux classées en fonction de la microfissuration instantanée et de la microfissuration sous-critique. L'endommagement instantané est régi par une force thermodynamique conjuguée, tandis que l'endommagement dépendant du temps évolue vers l'équilibre de la microstructure. En outre, l'accent est mis sur la modélisation de la matrice solide en tant que composante de cohésion-friction. Cela nécessite l'introduction d'une nouvelle variable interne, la déformation plastique de la matrice, qui se traduit par une transition fragile-ductile plus claire dans le régime de pré-crête, en particulier sous des pressions de confinement relativement élevées. Ensuite, la matrice plastique compressible est décrite séparément par une règle d'écoulement associée et une règle d'écoulement non associée, en comparaison avec un grand nombre de résultats d'essais. Il s'avère que le modèle non associé peut bien reproduire la transition compaction-dilatation avec des nombres cycliques. Enfin, le modèle unifié est développé pour étudier le comportement à long terme en termes de viscoplasticité de la matrice. Les mécanismes de déformation sont analysés en ce qui concerne le couplage entre la viscoplasticité de la matrice et la propagation sous-critique des microfissures
The primary objective of this thesis is to model the macroscopic mechanical behavior of geomaterials under both instantaneous and time-dependent loading conditions. In this context, the studied material is modeled from the view of microstructure using well-suited localization and homogenization schemes. At the microscopic scale, it is assumed that microcracks have a penny-shaped morphology and are randomly embedded in an isotropic solid matrix. In framework of thermodynamics, two internal variables, inelastic strain and microcrack-induced damage, are both classified in consideration of instantaneous microcracking and sub-critical microcracking. The instantaneous damage is driven by a conjugated thermodynamics force, while the time-dependent damage evolves towards microstructure equilibrium. Further, the emphasis is put on modeling the solid matrix as a cohesive-friction component. This needs to introduce a new internal variable, plastic strain of matrix, resulting in a clearer brittle-ductile transition in the pre-peak regime, especially under relative high confining pressures. Next, the plastic compressible matrix is separately described by an associated and a non-associated flow rule in comparison with a large amount of test results. It is found that the non-associated model can well reproduce the compaction-dilatation transition with cyclic numbers. Finally, the unified model is developed to investigate the long-term behavior in terms of matrix viscoplasticity. The deformation mechanisms are analyzed regarding the coupling between matrix viscoplasticity and sub-critical propagation of microcracks

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Mosbah, Pascal. „Etude expérimentale et modélisation du comportement de poudres métalliques au cours du compactage en matrice fermée“. Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10167.

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Ce memoire, qui se decompose en trois parties, traite de la compaction des poudres metalliques. Dans la premiere partie des essais de compression en matrice fermee, de compression simple, isotrope et triaxiale ainsi que des essais de traction sont effectues a partir de dispositifs originaux. Dans la deuxieme partie plusieurs lois de comportement elasto-plastiques avec ecrouissage en densite sont etudiees et identifiees a partir des differents essais qui viennent d'etre presentes. Enfin dans la troisieme partie les lois presentees sont implantees dans le code de calcul par elements finis lagamine de l'universite de liege. Des simulations du procede entier de compaction, c'est a dire compression, decharge et ejection, avec prise en compte du frottement poudre-matrice et de la deformation de la matrice sont effectuees et permettent une determination d'un champ de densite a l'issu du procede

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Buchteile zum Thema "Elastoplastic matrix"

Lagoudas, Dimitris C., und Andres C. Gavazzi. „Incremental Elastoplastic Behavior of Metal Matrix Composites Based on Averaging Schemes“. In Inelastic Deformation of Composite Materials, 465–85. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4613-9109-8_22.

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Ko, Yu-Fu, und Jiann-Wen Woody Ju. „Fiber Cracking and Elastoplastic Damage Behavior of Fiber Reinforced Metal Matrix Composites“. In Handbook of Damage Mechanics, 1023–53. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-5589-9_12.

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Ko, Yu-Fu, und Jiann-Wen Woody Ju. „Fiber Cracking and Elastoplastic Damage Behavior of Fiber Reinforced Metal Matrix Composites“. In Handbook of Damage Mechanics, 1–28. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8968-9_12-1.

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Ng, Ernest T. Y., und Afzal Suleman. „Elastoplastic Modeling of Multi-phase Metal Matrix Composite with Void Growth Using the Transformation Field Analysis and Governing Parameter Method“. In Computational Methods in Applied Sciences, 197–221. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8584-0_10.

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Yuan, K. Y., und Jiann-Wen Woody Ju. „New Strain Energy-Based Coupled Elastoplastic Damage-Healing Mechanics Accounting for Matric Suction Effect for Geomaterials“. In Handbook of Damage Mechanics, 1–24. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8968-9_14-1.

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Gramegna, Liliana, Ayman A. Abed, Wojciech T. Sołowski, Guido Musso und Gabriele Della Vecchia. „An Elastoplastic Framework Accounting for Changes in Matric and Osmotic Suction in Unsaturated Non-expansive Clays“. In Springer Series in Geomechanics and Geoengineering, 311–18. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-34761-0_38.

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Yuan, K. Y., und Jiann-Wen Woody Ju. „New Strain-Energy Based Coupled Elastoplastic Damage-Healing Mechanics Healing mechanics Accounting for Matric Suction Effect for Geomaterials“. In Handbook of Damage Mechanics, 1093–118. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-5589-9_14.

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Ju, J. W., und K. H. Tseng. „Effective Elastoplastic Behavior of Two-Phase Metal Matrix Composites: Micromechanics and Computational Algorithms“. In Inelasticity and Micromechanics of Metal Matrix Composites, 121–41. Elsevier, 1994. http://dx.doi.org/10.1016/b978-0-444-81800-3.50010-9.

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Janaki, N., K. Sushita, A. L. Wisemin Lins und T. R. Premila. „Modeling and Characterization of Carbon Nano Tube Nanocomposites“. In Intelligent Technologies for Scientific Research and Engineering, 140–46. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815079395123010016.

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The interfacial sliding motion of carbon nanotubes (CNTs) within a polymeric hosting matrix gives rise to energy dissipation. By tuning the interfacial shear strength (ISS) of the CNT-matrix interface, the dissipation can take place within tunable ranges of strain amplitudes. This is the basis for conceiving new multilayered carbon nanotube nanocomposites in which different layers with tunable ISS can lead to a concurrent optimization of strength and dissipation, often seen as two conflicting targets. Such optimization is tackled by a novel meso-mechanical nonlinear inelastic model proven to effectively predict the damping capacity of CNT nanocomposites. The proposed elastoplastic, rate-independent, constitutive theory is based on the mean-field homogenization method which combines the Eshelby equivalent inclusion method, the Mori-Tanaka homogenization, and the concept of inhomogeneous inclusions with inelastic eigen strains introduced to describe the inelastic stick-slip. Since the ISS parameter plays a key role in the nanocomposite strength and dissipation, the current work seeks to improve the strength and damping properties by suitable interfacial CNT-matrix functionalization. Variations in the ISS parameter can be achieved by a functionalization that affects the chemical bonds between CNTs and the hosting matrix. A set of experimental tests - including DMA analysis, calorimetry and spectroscopy — aims to evaluate the influence of the ISS parameter, together with other constitutive parameters, on the nanocomposite strength and damping capacity.

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Konferenzberichte zum Thema "Elastoplastic matrix"

Kwon, Y. W., C. Kim und G. Y. Yang. „A Unified Micromodel for Constitutive Behavior of Metal Matrix Composites Undergoing Plastic Deformation“. In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0656.

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Abstract The objective of this study is to develop a unified, three-dimensional micromodel which can describe the nonlinear elastoplastic constitutive behavior of MMC’s with continuous fibers, particles, or aligned short fibers as the reinforcement. In the micromodel, both the reinforcement and the matrix may have elastic and/or elastoplastic deformation(s), respectively. However, as in most cases, the development is shown for elastic reinforcement in an elastoplastic matrix. The micromodel uses a repeating unit-cell model with eight subcells. For a particulate or an aligned short fiber composite, one center subcell represents the particle or the short fiber while the rest of the subcells represent the matrix. On the other hand, two aligned subcells indicate the fiber for a fibrous composite. The micromodel yields the overall effective constitutive equation for an MMC with elastoplastic deformation in the matrix material. The effective stress-strain plots of various MMC’s are predicted using the micromodel for a wide variation of the reinforcement volume fraction. These results are compared to those obtained from the finite element analysis, and the two results agree very well.

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Ju, J. W., H. N. Ruan und Y. F. Ko. „Micromechanical Evolutionary Elastoplastic Damage Model for Fiber-Reinforced Metal Matrix Composites With Fiber Debonding“. In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59487.

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A micromechanical evolutionary damage model is proposed to predict the overall elastoplastic behavior and interfacial damage evolution of fiber-reinforced metal matrix composites. Progressive debonded fibers are replaced by equivalent voids. The effective elastic moduli of three-phase composites, composed of a ductile matrix, randomly located yet unidirectionally aligned circular fibers, and voids, are derived by using a rigorous micromechanical formulation. In order to characterize the overall elastoplastic behavior, an effective yield criterion is derived based on the ensemble-area averaging process and the first-order effects of eigenstrains.

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Liu, H. T., Lizhi Sun und J. W. Ju. „Micromechanics-Based Elastoplastic and Damage Modeling of Particle Reinforced Composites“. In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59303.

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A micromechanical damage model is proposed to predict the effective elastoplastic behavior of ductile composites containing randomly dispersed particles. The interfacial debonding between particles and the matrix is considered as the primary micromechanical damage mechanism. The debonded isotropic elastic reinforcements are replaced by equivalent anisotropic elastic inclusions. The interfacial debonding process is simulated by three-dimensional debonding angles. After the local stress field in the matrix is calculated, the homogenization averaging procedure is employed to estimate the effective elastic stiffness and yield function of the composites. The associative plastic flow rule and the isotropic hardening law are postulated based on the continuum plasticity theory. As applications, the overall elastoplastic and damage constitutive behavior of the composites under various loading conditions is numerically simulated and compared with available experimental results.

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Khalevitsky, Yu V., N. V. Burmasheva und A. V. Konovalov. „An approach to the parallel assembly of the stiffness matrix in elastoplastic problems“. In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2016): Proceedings of the 10th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2016. http://dx.doi.org/10.1063/1.4967080.

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Liu, Haitao, und Lizhi Sun. „Multiscale Modeling of Elastoplastic Behavior for Aluminum-Based Metallic-Glass Nanocomposites“. In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79208.

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Progress has recently been made in experimental studies on mechanical properties and strengthening mechanisms of nanoparticle (α-Al) reinforced amorphous aluminum-matrix nanocomposites. However, little quantitative mechanical modeling of amorphous nanocomposites is available to demonstrate the underlying strengthening and deforming mechanisms. The objective of this paper is to explore the overall constitutive relationship of α-Al-reinforced amorphous nanocomposites in terms of a multiscale approach starting from the microstructure at nanoscale. The overall strengthening and deforming behavior of the nanocomposites is investigated from nanomechanics framework and homogenization procedures. Specifically, with the introduction of the nanoparticle surface area-volume ratio, the dependence of overall mechanical properties on nanoparticle sizes is particularly emphasized. Further effects of the nanoparticle concentration and local particle interaction are formulated. The proposed model can provide direct determination of the intrinsic mechanisms of material structure-property relationship at the nanoscale.

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Tang, Tian, und Wenbin Yu. „A Variational Asymptotic Model for Predicting Initial Yielding Surface and Elastoplastic Behavior of Metal Matrix Composite Materials“. In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43285.

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The focus of this paper is to develop a micromechanics model based on the variational asymptotic method for unit cell homogenization (VAMUCH) for predicting of the initial yielding surface, overall instantaneous moduli, and elastoplastic behavior of metal matrix composites. Considering the size of the microstructure as a small parameter, we can formulate a variational statement of the unit cell through an asymptotic expansion of the energy functional. To handle realistic microstructures, we implement this new model using the finite element method. For model validation, we used a few examples to demonstrate the application and accuracy of this theory and the companion code.

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Ju, J. W., und K. Yanase. „Elastoplastic Micromechanical Damage Mechanics for Composites With Progressive Partial Fiber Debonding and Thermal Residual Stress“. In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42744.

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By incorporating interfacial damage and thermal residual stress, a novel elastoplastic damage model is proposed to predict the overall transverse mechanical behavior of fiber-reinforced ductile matrix composites within the framework of micromechanics. Based on the concept of fictitious inclusion, and taking the debonding angle into consideration, partially debonded isotropic fibers are replaced by equivalent orthotropic yet perfectly bonded elastic fibers. Up to three interfacial damage modes (no debonding, partial debonding and complete debonding) are considered. The Weibull’s probabilistic function is employed to describe the varying probability of progressive partial fiber debonding. The effective elastic moduli of four-phase composites, composed of a ductile matrix and randomly located yet unidirectionally aligned fibers (undamaged/damaged) are derived by a micromechanical formulation. Thermal residual stress is taken into account through the concept of thermal eigenstrain to study the effect of the manufacturing process-induced residual stress. Further, explicit exact formulation on the exterior point Eshelby’s tensor for elliptical fiber is utilized to investigate the effect on the inelastic mechanical responses of the composites due to the aspect ratio of elliptical fiber.

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Lee, Haeng-Ki, und Srdan Simunovic. „Constitutive Modeling for Impact Simulation of Random Fiber Composite Structures“. In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0888.

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Abstract A constitutive model for progressive crushing is presented to predict impact behavior and damage evolution in random carbon fiber polymer matrix composites (RCFPMCs). Based on the ensemble-volume averaging process and first-order effects of eigenstrains due to the existence of prolate fibers, an effective yield criterion is derived to estimate the overall elastoplastic damage responses. First, an effective elastoplastic constitutive damage model for aligned fiber-reinforced composites is proposed. A micromechanical damage constitutive model for RCFPMCs is then developed. The governing field equations and overall yield function for aligned fiber-orientations are averaged over all orientations to obtain the constitutive relations and effective yield function of RCFPMCs. Finally, the complete progressive damage constitutive model is implemented into finite element code DYNA3D to solve large scale problems such as automobile components and systems. An advantage of the progressive damage analysis is that the information from the progressive damage model can be implemented into finite element code as material input properties and thus the calculations required in the constitutive model can be greatly reduced.

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Chen, J. S., C. T. Wu, H. P. Wang und S. Yoon. „Efficient Meshfree Formulation for Metal Forming Simulations“. In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1879.

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Abstract A stabilized conforming (SC) nodal integration method is developed for elastoplastic contact analysis of metal forming processes. In this approach, strain smoothing stabilization is introduced to eliminate spatial instability in Galerkin meshfree methods using nodal integration. The gradient matrix associated with strain smoothing satisfies the integration constraint (IC) of linear exactness in the Galerkin approximation. Strain smoothing formulation and numerical procedures for history-dependent problems are introduced. Applications to metal forming analysis are presented, with the results demonstrating a significant improvement in computational efficiency without loss of accuracy.

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McLean, Matthew L., und D. Nicolas Espinoza. „Distant Fault Reactivation Due to Temperature and Pressure Changes Accounting for Rock Matrix and Fault Plasticity“. In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0656.

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ABSTRACT Large-scale geothermal energy production and carbon geological storage are emerging technologies. Injection of non-native fluids in the subsurface alters reservoir pore pressure and temperature changing the initial state of stress, even beyond the plume and thermal front, which could potentially lead to the reactivation of distant faults. Published work so far usually neglects elastoplastic rock matrix response and effects of plastified reservoir volume on distant stress changes. This paper presents three-dimensional thermo-hydro-mechanical (THM) numerical simulations of (1) a hydrothermal system with injector-producer doublet and (2) a carbon storage site with single injector, both solved with 3D finite element code ParaGeo. First, simulations show that assuming an elastic response for a geothermal reservoir results in more distant stress changes -which can be enough to disturb critically stressed distant faults-, than incorporating a more realistic elastoplastic model for the reservoir rock. Second, injection (without production) of a cold fluid may result in quick distant fault reactivation because the pressure front travels much faster than the temperature front, in the range of a decade or two in our model. Reservoir plasticity plays a negligible role when reservoir pressure increases and effective stress decreases. This work highlights the importance of using a realistic constitutive model and accurate estimation of in-situ stress for evaluating risks on sites subject to heat depletion or fluid injection. INTRODUCTION Subsurface activities that alter the pore pressure and temperature are known to potentially result in non-negligible seismicity (Wesson and Nicholson, 1987; Evans et al., 2012; Guglielmi et al., 2015) and may compromise fault sealing capacity if fault offsets become large (Zoback and Gorelick, 2012). Fluid injection increases pore pressure and may reactivate preexisting faults and fractures, triggering microseismic events (Majer et al., 2007). Reservoir cooling changes effective stress and may alter the state of stress well beyond the thermal plume (Kivi et al., 2022). Recent studies suggest that thermo-hydro-mechanical (THM) processes are likely to operate simultaneously but under different spatial extents, intensifying local stress changes and increasing complexity of distant stress changes (Martínez-Garzón et al., 2014). For example, observed seismicity and history matching at the Geysers geothermal field indicates that preexisting fracture reactivation is the result of reservoir cooling and fracture pressure increase with thermal effects dominating seismicity within the thermal plume (Rutqvist et al., 2015).

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