Готові списки джерел за темами / Micromechanic model

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Автор: Grafiati

Опубліковано: 8 червня 2024

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Статті в журналах з теми "Micromechanic model":

Altus, E., and A. Herszage. "A two-dimensional micromechanic fatigue model." Mechanics of Materials 20, no. 3 (May 1995): 209–23. http://dx.doi.org/10.1016/0167-6636(94)00057-3.

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Altus, Eli, and Ella Bergerson. "Fatigue of hybrid composites by a cohesive micromechanic model." Mechanics of Materials 12, no. 3-4 (November 1991): 219–28. http://dx.doi.org/10.1016/0167-6636(91)90019-v.

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Altus, E. "A cohesive micromechanic fatigue model. Part I: Basic mechanisms." Mechanics of Materials 11, no. 4 (July 1991): 271–80. http://dx.doi.org/10.1016/0167-6636(91)90027-w.

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Altus, E. "A cohesive micromechanic fatigue model. Part II: Fatigue-creep interaction and Goodman diagram." Mechanics of Materials 11, no. 4 (July 1991): 281–93. http://dx.doi.org/10.1016/0167-6636(91)90028-x.

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Khen, R., and E. Altus. "Effect of static mode on fatigue crack growth by a unified micromechanic model." Mechanics of Materials 21, no. 3 (October 1995): 169–89. http://dx.doi.org/10.1016/0167-6636(95)00011-9.

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Placidi, Luca, Francesco dell’Isola, Abdou Kandalaft, Raimondo Luciano, Carmelo Majorana, and Anil Misra. "A granular micromechanic-based model for Ultra High Performance Fiber-Reinforced Concrete (UHP FRC)." International Journal of Solids and Structures 297 (July 2024): 112844. http://dx.doi.org/10.1016/j.ijsolstr.2024.112844.

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Ghasemi, Ahmad Reza, Mohammad Mohammadi Fesharaki, and Masood Mohandes. "Three-phase micromechanical analysis of residual stresses in reinforced fiber by carbon nanotubes." Journal of Composite Materials 51, no. 12 (September 20, 2016): 1783–94. http://dx.doi.org/10.1177/0021998316669854.

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In this study, circular disk model and cylinder theory for two dimension (2D) and three dimension (3D), respectively, have been used to determine residual stresses in three-phase representative volume element. The representative volume element is consisting of three phases: carbon fiber, carbon nanotubes, and polymer matrix, that carbon fiber is reinforced by carbon nanotube using electrophoresis method. Initially, the residual stresses analysis of two-phase representative volume element has been implemented. The two-phase representative volume element has been divided to carbon fiber and matrix phases with different volume fractions. In the three-phase representative volume element, although the volume fraction of carbon fiber is constant and equal to 60%, the volume fractions of carbon nanotubes for various cases are different as 0%, 1%, 2%, 3%, 4%, and 5%. Also, there are two different methods to reinforce the fiber according to different coefficients of thermal expansion of the carbon fiber and carbon nanotube in two longitudinal and transverse directions; carbon nanotubes are placed on carbon fiber either parallel or around it like a ring. Subsequently, finite element method and circular disk model have been used for analyzing micromechanic of the residual stresses for 2D and then the results of stress invariant obtained by the finite element method have been compared with the circular disk model. Moreover, for 3D model, the finite element method and cylinder theory have been utilized for micromechanical analysis of the residual stresses and the results of stress invariant obtained by them, have been compared with each other. Results of the finite element method and analytical model have good agreement in 2D and 3D models.

Hernández, M. G., J. J. Anaya, L. G. Ullate, and A. Ibañez. "Formulation of a new micromechanic model of three phases for ultrasonic characterization of cement-based materials." Cement and Concrete Research 36, no. 4 (April 2006): 609–16. http://dx.doi.org/10.1016/j.cemconres.2004.07.017.

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Zhang, Chuangye, Wenyong Liu, Chong Shi, Shaobin Hu, and Jin Zhang. "Experimental Investigation and Micromechanical Modeling of Hard Rock in Protective Seam Considering Damage–Friction Coupling Effect." Sustainability 14, no. 23 (December 6, 2022): 16296. http://dx.doi.org/10.3390/su142316296.

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The hard rock in the protective coal seam of the Pingdingshan Mine in China is a typical quasi-brittle material exhibiting complex mechanical characteristics. According to available research on the mechanical property, the inelastic deformation and development of damage are considered related with crack initiation and propagation, which are main causes of the material degradation. In the present study, an original experimental investigation on the rock sample of the Pingdingshan coal mine is firstly carried out to obtain the basic mechanical responses in a conventional triaxial compression test. Based on the homogenization method and thermodynamic theory, a damage–friction coupled model is proposed to simulate the non-linear mechanical behavior. In the framework of micromechanics, the hard rock in a protective coal seam is viewed as a heterogeneous material composed of a homogeneous solid matrix and a large number of randomly distributed microcracks, leading to a Representative Elementary Volume (REV), i.e., the matrix–cracks system. By the use of the Mori–Tanaka homogenization scheme, the effective elastic properties of cracked material are obtained within the framework of micromechanics. The expression of free energy on the characteristic unitary is derived by homogenization methods and the pairwise thermodynamic forces associated with the inelastic strain and damage variables. The local stress tensor is decomposed to hydrostatic and deviatoric parts, and the effective tangent stiffness tensor is derived by considering both the plastic yield law and a specific damage criterion. The associated generalized Coulomb friction criterion and damage criterion are introduced to describe the evolution of inelastic strain and damage, respectively. Prepeak and postpeak triaxial response analysis is carried out by coupled damage–friction analysis to obtain analytical expressions for rock strength and to clarify the basic characteristics of the damage resistance function. Finally, by the use of the returning mapping procedure, the proposed damage–friction constitutive model is applied to simulate the deformation of Pingdingshan hard rock in triaxial compression with respect to different confining pressures. It is observed that the numerical results are in good agreement with the experimental data, which can verify the accuracy and show the obvious advantages of the micromechanic-based model.

Mahesh, C., K. Govindarajulu, and V. Balakrishna Murthy. "Simulation-based verification of homogenization approach in predicting effective thermal conductivities of wavy orthotropic fiber composite." International Journal of Computational Materials Science and Engineering 08, no. 04 (September 24, 2019): 1950015. http://dx.doi.org/10.1142/s2047684119500155.

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In this work, applicability of homogenization approach is verified with the micromechanics approach by considering wavy orthotropic fiber composite. Thermal conductivities of [Formula: see text]-300 orthotropic wavy fiber composite are determined for micromechanical model and compared with the results obtained by two stage homogenized model over volume fraction ranging from 0.1 to 0.6. Also, a methodology is suggested for reducing percentage deviation between homogenization and micromechanical approaches. Effect of debond on the thermal conductivities of wavy orthotrophic fiber composite is studied and compared with perfectly aligned fiber composite for different volume fraction. It is observed that results obtained by the homogenization approach are in good agreement with the results obtained through micromechanics approach. Maximum percentage deviation between homogenized and micromechanics models is 2.13%.

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Дисертації з теми "Micromechanic model":

KALEEL, IBRAHIM. "Computationally-efficient multiscale models for progressive failure and damage analysis of composites." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729362.

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GARCIA, DE MIGUEL ALBERTO. "Hierarchical component-wise models for enhanced stress analysis and health monitoring of composites structures." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729658.

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Webber, Kyle Grant. "Effect of Domain Wall Motion and Phase Transformations on Nonlinear Hysteretic Constitutive Behavior in Ferroelectric Materials." Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22695.

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The primary focus of this research is to investigate the non-linear behavior of single crystal and polycrystalline relaxor ferroelectric PMN-xPT and PZN-xPT through experimentation and modeling. Characterization of single crystal and polycrystalline specimens with similar compositions was performed. These data give experimental insight into the differences that may arise in a polycrystal due to local interaction with inhomogeneities. Single crystal specimens were characterized with a novel experimental technique that reduced clamping effects at the boundary and gave repeatable results. The measured experimental data was used in conjunction with electromechanical characterizations of other compositions of single crystal specimens with the same crystallographic orientation to study the compositional effects on material properties and phase transition behavior. Experimental characterization provided the basis for the development of a model of the continuous phase transformation behavior seen in PMN-xPT single crystals. In the modeling it is assumed that a spatial chemical and structural heterogeneity is primarily responsible for the gradual phase transformation behavior observed in relaxor ferroelectric materials. The results are used to simulate the effects of combined electrical and mechanical loading. An improved rate-independent micromechanical constitutive model based on the experimental observations of single crystal and polycrystalline specimens under large field loading is also presented. This model accounts for the non-linear evolution of variant volume fractions. The micromechanical model was calibrated using single crystal data. Simulations of the electromechanical behavior of polycrystalline ferroelectric materials are presented. These results illustrate the effects of non-linear single crystal behavior on the macroscopic constitutive behavior of polycrystals.

Gu, Xiaohong. "Micromechanics of model carbon-fibre/epoxy-resin composites." Thesis, University of Manchester, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488261.

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McClain, Michael Patrick. "A micromechanical model for predicting tensile strength." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-10052007-143117/.

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Keralavarma, Shyam Mohan. "A micromechanics based ductile damage model for anisotropic titanium alloys." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2620.

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Mihai, Iulia. "Micromechanical constitutive models for cementitious composite materials." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/24624/.

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A micromechanical constitutive model for concrete is proposed in which microcrack initiation, in the interfacial transition zone between aggregate particles and cement matrix, is governed by an exterior-point Eshelby solution. The model assumes a two-phase elastic composite, derived from an Eshelby solution and the Mori-Tanaka homogenization method, to which circular microcracks are added. A multi-component rough crack contact model is employed to simulate normal and shear behaviour of rough microcrack surfaces. It is shown, based on numerical predictions of uniaxial, biaxial and triaxial behaviour that the model captures key characteristics of concrete behaviour. An important aspect of the approach taken in this work is the adherence to a mechanistic modelling philosophy. In this regard the model is distinctly more rigorously mechanistic than its more phenomenological predecessors. Following this philosophy, a new more comprehensive crack-plane model is described which could be applied to crack-planes in the above model. In this model the crack surface is idealised as a series of conical teeth and corresponding recesses of variable height and slope. Based on this geometrical characterization, an effective contact function is derived to relate the contact stresses on the sides of the teeth to the net crack-plane stresses. Plastic embedment and frictional sliding are simulated using a local plasticity model in which the plastic surfaces are expressed in terms of the contact surface function. Numerical simulations of several direct shear tests indicate a good performance of the model. The incorporation of this crack-plane model in the overall constitutive model is the next step in the development of the latter. Computational aspects such as contact related numerical instability and accuracy of spherical integration rules employed in the constitutive model are also discussed. A smoothed contact state function is proposed to remove spurious contact chatter behaviour at a constitutive level. Finally, an initial assessment of the performance of the micromechanical model when implemented in a finite element program is presented. This evaluation clearly demonstrates the capability of the proposed model to simulate the behaviour of plain and reinforced concrete structural elements as well as demonstrating the potential of the micromechanical approach to achieve a robust and comprehensive model for concrete.

Bandorawalla, Tozer Jamshed. "Micromechanics-Based Strength and Lifetime Prediction of Polymer Composites." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26445.

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With the increasing use of composite materials for diverse applications ranging from civil infrastructure to offshore oil exploration, the durability of these materials is an important issue. Practical and accurate models for lifetime will enable engineers to push the boundaries of design and make the most efficient use of composite materials, while at the same time maintaining the utmost standards of safety. The work described in this dissertation is an effort to predict the strength and rupture lifetime of a unidirectional carbon fiber/polymer matrix composite using micromechanical techniques. Sources of material variability are incorporated into these models to predict probabilistic distributions for strength and lifetime. This approach is best suited to calculate material reliability for a desired lifetime under a given set of external conditions. A systematic procedure, with experimental verification at each important step, is followed to develop the predictive models in this dissertation. The work begins with an experimental and theoretical understanding of micromechanical stress redistribution due to fiber fractures in unidirectional composite materials. In-situ measurements of fiber stress redistribution are made in macromodel composites where the fibers are large enough that strain gages can be mounted directly onto the fibers. The measurements are used to justify and develop a new form of load sharing where the load of the broken fiber is redistributed only onto the nearest adjacent neighbors. The experimentally verified quasi-static load sharing is incorporated into a Monte Carlo simulation for tensile strength modeling. Very good agreement is shown between the predicted and experimental strength distribution of a unidirectional composite. For the stress-rupture models a time and temperature dependent load-sharing analysis is developed to compute stresses due an arbitrary sequence of fiber fractures. The load sharing is incorporated into a simulation for stress rupture lifetime. The model can be used to help understand and predict the role of temperature in accelerated measurement of stress-rupture lifetimes. It is suggested that damage in the gripped section of purely unidirectional specimens often leads to inaccurate measurements of rupture lifetime. Hence, rupture lifetimes are measured for [90/0_3]_s carbon fiber/polymer matrix specimens where surface 90 deg plies protect the 0 deg plies from damage. Encouraging comparisons are made between the experimental and predicted lifetimes of the [90/0_3]_s laminate. Finally, it is shown that the strength-life equal rank assumption is erroneous because of fundamental differences between quasi-static and stress-rupture failure behaviors in unidirectional polymer composites.
Ph. D.

Hu, Lianxin. "Micromechanics of granular materials : Modeling anisotropy by a hyperelastic-plastic model." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI133.

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Afin de modéliser le comportement des géométariaux sous des charges complexes, plusieurs études et travaux expérimentaux ont été réalisées afin d’établir des modèles constitutifs relatifs. Une caractéristique importante des matériaux granulaires est que la relation entre la contrainte et la déformation et ce même dans le domaine élastique n’est pas linéaire, contrairement aux réponses du métal. Il a également été constaté que la réponse contrainte-déformation des matériaux granulaires montre les caractéristiques de l’anisotropie induite, ainsi que les non-linéarités. En outre, l’anisotropie induite par la contrainte se produit pendant le processus de chargement sur les sols, par exemple, les charges ou les déplacements. Dans ce travail, un nouveau modèle qui est une combinaison de modèle hyperélastique Houlsby et modèle élastoplastique Plasol a été proposé. Ce nouveau modèle a pris en compte la réponse non linéaire de la contrainte dans le domaine élastique et plastique, et l’élasticité anisotrope a également été bien considérée. En outre, les problèmes de l’écoulement de la déformation plastique a été calibré par un algorithme d’intégration approprié. Plus tard, le nouveau modèle a été vérifié en utilisant la méthode numérique et comparé aux expériences de laboratoire dans des conditions triaxiales axisymmétriques. Les résultats de comparaison ont montré un bon effet de simulation du nouveau modèle qui a juste utilisé un seul ensemble de paramètres pour un sol spécifique dans différentes situations de contraintes. Ensuite, l’analyse de la nouvelle variable interne du modèle, c’est-à-dire l’exposant de pression, a montré que la valeur de l’exposant de pression qui correspond au degré d’anisotropie a eu un effet évident sur la réponse contrainte-déformation. De plus, ce type d’effet est également affecté par la densité et l’état de drainage des échantillons. En s’appuyant sur un nouveau modèle, un facteur de sécurité qui fait référence au critère de travail de deuxième ordre a été adopté et testé dans un modèle axisymétrique et un modèle de pente réel. Il a montré que la valeur négative ou la diminution spectaculaire du travail global normalisé de second ordre se produit lors d’une défaillance locale ou globale avec apparition d’énergie cinétique. Cette caractéristique du travail du second ordre peut également être affectée par l’exposant à pression variable. Enfin, un nouveau modèle a également été comparé à un modèle élastoplastique qui considère à la fois l’anisotropie élastique et la dilatation anisotrope, c’est-à-dire le modèle SANISAND modifié. Les avantages et les inconvénients ont été illustrés dans les résultats de comparaison
In order to model the behavior of geometarials under complex loadings, several researches have done numerous experimental works and established relative constitutive models for decades. An important feature of granular materials is that the relationship between stress and strain especially in elastic domain is not linear, unlike the responses of typical metal or rubber. It has been also found that the stress-strain response of granular materials shows the characteristics of cross-anisotropy, as well as the non-linearities. Besides, the stress-induced anisotropy occurs expectedly during the process of disturbance on soils, for example, the loads or displacements. In this work, a new model which is a combination of Houlsby hyperelastic model and elastoplastic Plasol model was proposed. This new model took into account the non-linear response of stress and strain in both elastic and plastic domain, and the anisotropic elasticity was also well considered. Moreover, the overflow problem of plastic strain in plastic part was calibrated by a proper integration algorithm. Later, new model was verified by using numerical method and compared with laboratory experiments in axisymmetric triaxial conditions. The comparison results showed a good simulation effect of new model which just used one single set of parameters for a specific soil in different confining pressure situations. Then the analysis of new model internal variable, i.e., pressure exponent, illustrated that the value of pressure exponent which corresponds to the degree of anisotropy had an obvious effect on the stress-strain response. Moreover, this kind of effect is also affected by the density and drainage condition of samples. Basing on new model, a safety factor which refers to the second-order work criterion was adopted and tested in axisymmetric model and actual slope model. It showed that the negative value or dramatic decreasing of global normalized second-order work occurs accompanying with a local or global failure with a burst of kinetic energy. This feature of second-order work can also be affected by the variable pressure exponent. At last, new model was also compared with an elastoplastic model which considers both anisotropic elastic and anisotropic dilatancy, i.e., modified SANISAND model. Both advantages and disadvantages were illustrated in the comparison results

Abdelal, Gasser F. "A three-phase constitutive model for macrobrittle fatigue damage of composites." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1485.

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Thesis (Ph. D.)--West Virginia University, 2000.
Title from document title page. Document formatted into pages; contains xiii, 183 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 180-183).

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Книги з теми "Micromechanic model":

Altus, Eli. Fatigue of hybrid composites by a cohesive micromechanic model. Haifa, Isreal: Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, 1991.

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Zohdi, Tarek I. Introduction to computational micromechanics. Berlin: Springer, 2005.

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Gu, Xiaohong. Micromechanics of model carbon-fibre/epoxy-resin composites. Manchester: UMIST, 1995.

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Zohdi, Tarek I. An introduction to computational micromechanics. Berlin: Springer, 2008.

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V, Sankar Bhavani, and Langley Research Center, eds. Micromechanical models for textile structural composites. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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Kang, Hsü, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Micromechanical model of crack growth in fiber reinforced ceramics. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1990.

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M, Arnold Steven, and United States. National Aeronautics and Space Administration., eds. Micromechanics analysis code (MAC): User guide. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Z, Voyiadjis G., Ju J. W, and U.S. National Congress of Applied Mechanics (12th : 1994 : University of Washington, Seattle), eds. Inelasticity and micromechanics of metal matrix composites. Amsterdam: Elsevier, 1994.

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-B, Mühlhaus H., ed. Continuum models for materials with microstructure. Chichester, England: Wiley, 1995.

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United States. National Aeronautics and Space Administration., ed. COMGEN-BEM: Boundary element model generation for composite materials micromechanical analysis. Washington, DC: National Aeronautics and Space Administration, 1992.

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Частини книг з теми "Micromechanic model":

Huang, Zheng-Ming, and Ye-Xin Zhou. "Bridging Micromechanics Model." In Strength of Fibrous Composites, 53–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22958-9_3.

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Gologanu, M., J. B. Leblond, G. Perrin, and J. Devaux. "Recent Extensions of Gurson’s Model for Porous Ductile Metals." In Continuum Micromechanics, 61–130. Vienna: Springer Vienna, 1997. http://dx.doi.org/10.1007/978-3-7091-2662-2_2.

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Jiang, Dazhi. "Generalization of Eshelby’s Formalism and a Self-Consistent Model for Multiscale Rock Deformation." In Continuum Micromechanics, 389–416. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23313-5_17.

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Tanaka, K., and H. Koguchi. "Elastic/Plastic Indentation Hardness of Ceramics: The Dislocation Punching Model." In Micromechanics and Inhomogeneity, 421–31. New York, NY: Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4613-8919-4_27.

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Roux, Jean-Noël. "Granular Materials: Micromechanical Approaches of Model Systems." In Mesoscale Models, 141–93. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94186-8_4.

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Mier, J. G. M., and A. Vervuurt. "Towards Quantitatively Correct Micromechanics Models." In PROBAMAT-21st Century: Probabilities and Materials, 405–17. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5216-7_23.

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Aydin, Gokhan, M. Erden Yildizdag, and Bilen Emek Abali. "Continuum Models via Granular Micromechanics." In Advanced Structured Materials, 183–92. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04548-6_10.

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Gong, Z. L., and T. R. Hsu. "A Constitutive Model for Cyclic Inelastic Deformation of Solids." In Recent Developments in Micromechanics, 127–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84332-7_10.

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Dormieux, Luc, and Djimédo Kondo. "Ellipsoidal Crack Model: The Eshelby Approach." In Micromechanics of Fracture and Damage, 155–61. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119292166.ch6.

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Chen, Zengtao, and Cliff Butcher. "Application of the Complete Percolation Model." In Micromechanics Modelling of Ductile Fracture, 275–90. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6098-1_11.

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Тези доповідей конференцій з теми "Micromechanic model":

Bennetts, Craig, and Ahmet Erdemir. "Automated Generation of Tissue-Specific Finite Element Models Containing Ellipsoidal Cellular Inclusions." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80719.

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Microstructural cellular finite element (FE) models provide a means of describing tissue micromechanics and cell mechanobiology. For the cartilage, for example, the mechanical environment of chondrocytes has been explored with models such as those from the pioneering work of Guilak and Mow [1]. However, most cellular FE models typically include a single cell. These models do not provide the capacity to explore mechanobiological function and micromechanical effects caused by intercellular interactions. Therefore, it is desirable to develop models that more closely represent cell distribution and shape within the tissue of interest.

HOCHSTER, HADAS, SHIYAO LIN, VIPUL RANATUNGA, NOAM N. Y. SHEMESH, and RAMI HAJ-ALI. "INTEGRATED PROXY MICROMECHANICAL MODELS IN MULTISCALE ANALYSIS USING DEEP LEARNING FOR LAMINATED COMPOSITES SUBJECT TO LOW-VELOCITY IMPACT." In Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36542.

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Multiscale nonlinear micromechanical approaches can analyze laminated composite structures. In contrast, current classical macromechanical modeling approaches depict composite materials as anisotropic homogenized media. This research proposes alternative refined micromechanics that can generate the local mechanical behavior of fiber and matrix constituents and accurately depict the microstructure. The parametric high-fidelity generalized method of cells (PHFGMC) is an advanced micromechanical method that can be used for the nonlinear and failure analysis of different composite material systems. The computational effort required for generating the nonlinear multiaxial behavior is relatively small, depending on the size of the discretized repeating unit cell (RUC). However, it is computationally challenging, if not impossible, to integrate refined nonlinear micromechanical models within a multiscale finite element (FE) analysis of composite structures. To that end, we propose a new artificial neural network (ANN) based micromechanical modeling framework, termed ANN-PHFGMC, for depicting the nonlinear behavior of fiber-reinforced polymeric (FRP) materials. Pre-simulated mechanical stress-strain responses and behaviors are determined using the PHFGMC to generate a multiaxial training database for the ANN micromodel. The PHFGMC effective stress-strain responses for different applied multiaxial strain paths are divided into two sets of data; one for the training and the other for verifying the trained ANN-PHFGMC model. The resulting trained ANN-PHFGMC is accurate, with less than a 5% error in the verified predictions. Next, the ANN-PHFGMC model can be integrated within a commercial explicit FE code for multiscale low-velocity impact (LVI) analysis of laminated composite plates.

Chandraseker, Karthick, Debdutt Patro, Ajaya Nayak, Shu Ching Quek, and Chandra S. Yerramalli. "Scaling Studies in Modeling for Compressive Strength of Thick Composite Structures." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38894.

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Composite material usage in primary load bearing structures has continued to expand in aerospace, auto and wind energy industries. Large composite part thicknesses in some load bearing applications lead to defects during manufacturing. Typically, these defects are in the form of fiber waves, voids and delaminations. It is well known in the composite literature that composite compressive strength is a strong function of fiber alignment, and fiber waviness can cause failure due to fiber microbuckling and kinking or failure by splitting at the fiber/resin interface. A detailed micromechanical analysis of these wavy defects is needed to estimate the strength reductions due to presence of wavy defects in thick uni-directional (UD) laminates. For example, real composite part thicknesses in industrial applications are in the range of 40 mm-60 mm while individual fiber and resin layers are only a few microns in thickness. Hence, micromechanics finite element (FE) models involving individual layers require an enormous number of elements, which, in addition, scales poorly with the part thickness. Earlier studies on the effect of fiber waviness have focused on simplified homogenized models to study the effect of fiber waviness. However, such models cannot resolve local details such as inter-layer stresses that initiate resin yielding. In the present work, two modeling approaches are investigated — (i) a micromechanics approach in which individual fiber and resin layers are explicitly modeled, and (ii) a tow-level approach in which the fiber and resin properties are homogenized to generate effective properties of a tow. It is demonstrated that the two approaches lead to identical predictions of peak load for identical coupon dimensions. It is also shown that the peak compressive load plateaus beyond a certain value of coupon thickness. This information enables the modeling and testing of an actual thick part using a coupon of greatly reduced thickness and hence smaller number of elements in the computational model without compromising on the details afforded by a micromechanical model.

Lissenden, Cliff J., and Steve M. Arnold. "Critique of Macro Flow/Damage Surface Representations for Metal Matrix Composites Using Micromechanics." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0486.

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Abstract Guidance for the formulation of robust, multiaxial, constitutive models for advanced materials is provided by addressing theoretical and experimental issues using micromechanics. The multiaxial response of metal matrix composites, depicted in terms of macro flow/damage surfaces, is predicted at room and elevated temperatures using an analytical micromechanical model that includes viscoplastic matrix response as well as fiber-matrix debonding. Macro flow/damage surfaces (i.e., debonding envelopes, matrix threshold surfaces, macro “yield” surfaces, surfaces of constant inelastic strain rate, and surfaces of constant dissipation rate) are determined for silicon carbide/titanium in three stress spaces. Residual stresses are shown to offset the centers of the flow/damage surfaces from the origin and their shape is significantly altered by debonding. The results indicate which type of flow/damage surfaces should be characterized and what loadings applied to provide the most meaningful experimental data for guiding theoretical model development and verification.

Anyimah, Peter Owusu, Leifeng Meng, Shizhong Cheng, Nabayan Chakma, Mao Sheng, and Arshad Shehzad Ahmad Shahid. "PFC Modelling on Natural Weak Planes of Laminated Shale and Their Influences on Tensile Fracture Propagation." In International Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/igs-2022-092.

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Abstract Laminated shale reserves various natural weak planes involving some bedding planes, natural fractures and mineral dykes. The obvious phenomenon of the interactions between hydraulic fractures and bedding weak planes were observed involving arrest, crossing, and diversion in previous works. Moreover, the bedding angles, cement mineral compositions of natural weak planes, and net pressure of hydraulic fracture were considered as the primary factors to determine the type of interaction. However, the rock failure modes and characterization of weak planes from micromechanics has been yet addressed. In this paper, a Particle Flow Code (PFC) model on natural weak planes of laminated shale was proposed by considering micromechanical properties including the cohesive strength, stiffness, elastic modulus, and friction angle. The PFC model was validated by the three-point bending tests on a typical laminated shale. The influence of weak plane angles, elastic modulus, and strength of weak planes on tensile fracture propagation were obtained. Their interaction types and dominant failure mode from tensile to shear were analyzed. It concludes that fractures divert in the inclined angles and low strength of natural weak planes, crossing occurs in the opposite case. Introduction Shale oil and gas formation normally reserves various natural weak planes involving the weak bedding planes, natural fractures and mineral dykes. It is evident that the natural weak planes affect hydraulic fracture geometry. The obvious phenomenon of the interactions between hydraulic fractures and bedding weak planes were observed involving arrest, crossing, and diversion in previous works. Moreover, the bedding angles, cement mineral compositions of natural weak planes, and net pressure of hydraulic fracture were considered as the primary factors to determine the type of interaction. However, the rock failure modes and characterization of weak planes from micromechanics has been yet addressed.

Aluko, Olanrewaju. "Investigation on the Impact of Morphology and Arrangement of Graphene Nanoplatelet on Mechanical Behavior of Epoxy Nanocomposites." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-94845.

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Abstract This research study addresses how the arrangement and morphology of the Graphene nanoplatelet (GNP) impacts the properties of epoxy nanocomposites using polycrystalline theory and micromechanics. The effective properties of the macroscopic epoxy network were used as inputs with GNP properties in the micromechanical model. Generalized Method of Cells (GMC) was applied to evaluate mechanical properties of the nanocomposites. The obtained results showed that the morphology and the arrangements of inclusions in epoxy have significant impact on the mechanical behavior of GNP/epoxy nanocomposites. The results of the simulations provide an understanding of the link between the morphology, the arrangement of the reinforcements, and the composite performance. The methodology can be used to optimize the GNP/epoxy performance for different engineering applications in automotive and aerospace industries.

Aluko, O., M. Li, and N. Zhu. "Application of Micromechanics to Static Failure Analysis of Graphene Reinforced Epoxy Nanocomposites." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-70710.

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Abstract The effect of tensile loadings and proportions of carbon fiber on the allowable stress calculations and static failure analysis of carbon fiber epoxy composites were investigated under uniaxial tensile loadings. Micromechanical modeling analysis was applied to model the failures of composites at the continuum length scale. The results obtained from molecular dynamics analysis of graphene and epoxy, were utilized as inputs in the MAC/GMC micromechanics software to model and evaluate the allowable stress values and static failures of carbon fiber reinforced epoxy composites. The computed results for composite elastic allowable stress estimation for the average materials and the static failure analysis were compared and these results were in agreement. The study has added to the understanding of the failure mechanism of the carbon fiber reinforce epoxy composites as well as the interactions of the constituents at failure.

Ju, Jaehyung, Joshua D. Summers, John Ziegert, and Georges Fadel. "Nonlinear Elastic Constitutive Relations of Auxetic Honeycombs." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12654.

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When designing a flexible structure consisting of cellular materials, it is important to find the maximum effective strain of the cellular material resulting from the deformed cellular geometry and not leading to local cell wall failure. In this paper, a finite in-plane shear deformation of auxtic honeycombs having effective negative Poisson’s ratio is investigated over the base material’s elastic range. An analytical model of the inplane plastic failure of the cell walls is refined with finite element (FE) micromechanical analysis using periodic boundary conditions. A nonlinear constitutive relation of honeycombs is obtained from the FE micromechanics simulation and is used to define the coefficients of a hyperelastic strain energy function. Auxetic honeycombs show high shear flexibility without a severe geometric nonlinearity when compared to their regular counterparts.

Konietzky, H. "Micromechanical rock models." In The 2016 Isrm International Symposium, Eurock 2016. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315388502-5.

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Ju, J. W., and 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.

Звіти організацій з теми "Micromechanic model":

Jeyapalan, Jey K., M. Thiyagaram, and W. E. Saleira. Micromechanics Models for Unsaturated, Saturated, and Dry Sands. Fort Belvoir, VA: Defense Technical Information Center, January 1988. http://dx.doi.org/10.21236/ada189727.

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Rossettos, John N. A Micromechanical Model for Slit Damaged Braided Fabric Air-Beams. Fort Belvoir, VA: Defense Technical Information Center, May 2004. http://dx.doi.org/10.21236/ada424913.

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Zhang, Xingyu, Matteo Ciantia, Jonathan Knappett, and Anthony Leung. Micromechanical study of potential scale effects in small-scale modelling of sinker tree roots. University of Dundee, December 2021. http://dx.doi.org/10.20933/100001235.

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When testing an 1:N geotechnical structure in the centrifuge, it is desirable to choose a large scale factor (N) that can fit the small-scale model in a model container and avoid unwanted boundary effects, however, this in turn may cause scale effects when the structure is overscaled. This is more significant when it comes to small-scale modelling of sinker root-soil interaction, where root-particle size ratio is much lower. In this study the Distinct Element Method (DEM) is used to investigate this problem. The sinker root of a model root system under axial loading was analysed, with both upward and downward behaviour compared with the Finite Element Method (FEM), where the soil is modelled as a continuum in which case particle-size effects are not taken into consideration. Based on the scaling law, with the same prototype scale and particle size distribution, different scale factors/g-levels were applied to quantify effects of the ratio of root diameter (𝑑𝑟) to mean particle size (𝐷50) on the root rootsoil interaction.

Lee, H. K., and S. Simunovic. A Micromechanical Constitutive Model of Progressive Crushing in Random Carbon Fiber Polymer Matrix Composites. Office of Scientific and Technical Information (OSTI), September 1999. http://dx.doi.org/10.2172/754359.

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Zurek, A. K., W. R. Thissell, D. L. Tonks, R. Hixon, and F. Addessio. Quantification of damage evolution for a micromechanical model of ductile fracture in spallation of tantalum. Office of Scientific and Technical Information (OSTI), May 1997. http://dx.doi.org/10.2172/515560.

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Coker, Demirkan, Frank Boller, Joseph Kroupa, and Noel E. Ashbaugh. FIDEP2 User Manual to Micromechanical Models for Thermoviscoplastic Behavior of Metal Matrix Composites. Fort Belvoir, VA: Defense Technical Information Center, September 1998. http://dx.doi.org/10.21236/ada401542.

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Pollock, Tresa M., and Michael J. Mills. MEANS 2: Microstructure- and Micromechanism-Sensitive Property Models for Advanced Turbine Disk and Blade Systems. Fort Belvoir, VA: Defense Technical Information Center, February 2008. http://dx.doi.org/10.21236/ada483775.

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Jordan, E. A micromechanical viscoplastic stress-strain model with grain boundary sliding. Final report, April 15, 1988--February 28, 1996. Office of Scientific and Technical Information (OSTI), February 1998. http://dx.doi.org/10.2172/570142.

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Pisani, William, Dane Wedgeworth, Michael Roth, John Newman, and Manoj Shukla. Exploration of two polymer nanocomposite structure-property relationships facilitated by molecular dynamics simulation and multiscale modeling. Engineer Research and Development Center (U.S.), March 2023. http://dx.doi.org/10.21079/11681/46713.

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Polyamide 6 (PA6) is a semi-crystalline thermoplastic used in many engineering applications due to good strength, stiffness, mechanical damping, wear/abrasion resistance, and excellent performance-to-cost ratio. In this report, two structure-property relationships were explored. First, carbon nanotubes (CNT) and graphene (G) were used as reinforcement molecules in simulated and experimentally prepared PA6 matrices to improve the overall mechanical properties. Molecular dynamics (MD) simulations with INTERFACE and reactive INTERFACE force fields (IFF and IFF-R) were used to predict bulk and Young's moduli of amorphous PA6-CNT/G nanocomposites as a function of CNT/G loading. The predicted values of Young's modulus agree moderately well with the experimental values. Second, the effect of crystallinity and crystal form (α/γ) on mechanical properties of semi-crystalline PA6 was investigated via a multiscale simulation approach. The National Aeronautics and Space Administration, Glenn Research Center's micromechanics software was used to facilitate the multiscale modeling. The inputs to the multiscale model were the elastic moduli of amorphous PA6 as predicted via MD and calculated stiffness matrices from the literature of the PA6 α and γ crystal forms. The predicted Young's and shear moduli compared well with experiment.

Saadeh, Shadi, and Maria El Asmar. Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method. Mineta Transporation Institute, September 2023. http://dx.doi.org/10.31979/mti.2023.2243.

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Cracking is a primary mode of failure for asphalt concrete (AC), resulting in road damage and deterioration, and leading to an increase in road hazards and fatalities. Studying the fracture behavior of AC is an effective way to learn how to best enhance their cracking resistance. To do this, the indirect tensile cracking laboratory test (IDEAL-CT) was developed and used to assess the AC cracking behavior by defining a unique index that allows the ranking of different mixes’ cracking resistance. The sensitivity of the test results to the test parameters is needed to monitor the test’s performance. Several parameters impact the result of the IDEAL-CT. This study focuses on the variation of air voids, loading rate, aggregate shape, bonding type, and gradation mix. Performing more than 450 test scenarios—varying multiple factors and conducting enough tests for each variation—would require considerable resources and time. To solve the issue, the Particle Flow Code in two-dimension software (PFC2D) using the discrete element method (DEM) is adapted to mitigate the need for actual laboratory tests. Initial findings yielded a better understanding of the micromechanical behavior of each mix, showing that air void content has more impact than loading rate; a decrease of 2% in air voids resulted in an increase of more than 50% in cracking resistance. Additionally, different aggregate sources and bonding strengths affected the cracking resistance. These results can inform further studies on AC cracking in order to reduce road damage and deterioration to keep roads safe.