Relevant bibliographies by topics / Materials Engineering; Computational solid mechanics

Academic literature on the topic 'Materials Engineering; Computational solid mechanics'

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Published: 6 September 2023

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Journal articles on the topic "Materials Engineering; Computational solid mechanics"

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MIYOSHI, Toshiro. "Supercomputing in Computational Solid Mechanics." Transactions of the Japan Society of Mechanical Engineers Series A 57, no. 541 (1991): 1958–63. http://dx.doi.org/10.1299/kikaia.57.1958.

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Tomita, Yoshihiro. "Simulations of Plastic Instabilities in Solid Mechanics." Applied Mechanics Reviews 47, no. 6 (June 1, 1994): 171–205. http://dx.doi.org/10.1115/1.3111077.

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The purpose of the present article is provide a perspective for computational predictions related to such plastic instabilities as buckling, necking and flow localization including shear–banding under a wide range of deformation rates for a variety of materials, including single– and polycrystals. Computational bifurcation analyses for general cases, axisymmetric to nonaxisymmetric deformation, very thin–walled bodies, and specific materials with nonstandard constitutive equations are given. The postbifurcation analyses and regularization schemes to remedy the problems associated with spurious mesh sensitivity and incorrect convergence in finite element prediction of flow localization behavior are discussed. The instability behavior of thick circular tubes deformed under pressure and combined loading of internal/external pressure and axial force, neck and bulge propagations in polymeric materials, wrinkling of thin plates and shells under sheet metal forming processes, flow localization of thermo–elasto–viscoplastic materials under a wide range of deformation rates including adiabatic shear banding, and flow localization behavior of mono– and polycrystalline solids are reviewed with illustrative examples.
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Chong, Ken P. "Nano Science and Engineering in Solid Mechanics." Acta Mechanica Solida Sinica 21, no. 2 (April 2008): 95–103. http://dx.doi.org/10.1007/s10338-008-0812-7.

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Su, Tung-Huan, Szu-Jui Huang, Jimmy Gaspard Jean, and Chuin-Shan Chen. "Multiscale computational solid mechanics: data and machine learning." Journal of Mechanics 38 (2022): 568–85. http://dx.doi.org/10.1093/jom/ufac037.

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Abstract Multiscale computational solid mechanics concurrently connects complex material physics and macroscopic structural analysis to accelerate the application of advanced materials in the industry rather than resorting to empirical constitutive models. The rise of data-driven multiscale material modeling opens a major paradigm shift in multiscale computational solid mechanics in the era of material big data. This paper reviews state-of-the-art data-driven methods for multiscale simulation, focusing on data-driven multiscale finite element method (data-driven FE2) and data-driven multiscale finite element-deep material network method (data-driven FE-DMN). Both types of data-driven multiscale methods aim to resolve the past challenge of concurrent multiscale simulation. Numerical examples are designed to demonstrate the effectiveness of data-driven multiscale simulation methods. Future research directions are discussed, including data sampling strategy and data generation technique for the data-driven FE2 method and generalization of data-driven FE-DMN method.
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Zhong, Wanxie. "Some developments of computational solid mechanics in China." Computers & Structures 30, no. 4 (January 1988): 783–88. http://dx.doi.org/10.1016/0045-7949(88)90105-8.

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Karabelas, Elias, Gundolf Haase, Gernot Plank, and Christoph M. Augustin. "Versatile stabilized finite element formulations for nearly and fully incompressible solid mechanics." Computational Mechanics 65, no. 1 (September 11, 2019): 193–215. http://dx.doi.org/10.1007/s00466-019-01760-w.

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Abstract Computational formulations for large strain, polyconvex, nearly incompressible elasticity have been extensively studied, but research on enhancing solution schemes that offer better tradeoffs between accuracy, robustness, and computational efficiency remains to be highly relevant. In this paper, we present two methods to overcome locking phenomena, one based on a displacement-pressure formulation using a stable finite element pairing with bubble functions, and another one using a simple pressure-projection stabilized $$\mathbb {P}_1 - \mathbb {P}_1$$P1-P1 finite element pair. A key advantage is the versatility of the proposed methods: with minor adjustments they are applicable to all kinds of finite elements and generalize easily to transient dynamics. The proposed methods are compared to and verified with standard benchmarks previously reported in the literature. Benchmark results demonstrate that both approaches provide a robust and computationally efficient way of simulating nearly and fully incompressible materials.
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Xing-feng, Wang, and Wang Xing-fa. "Computational model of boundary integral equation in solid mechanics." Applied Mathematics and Mechanics 6, no. 6 (June 1985): 559–68. http://dx.doi.org/10.1007/bf01876395.

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Rashid, M. M., and A. Sadri. "The partitioned element method in computational solid mechanics." Computer Methods in Applied Mechanics and Engineering 237-240 (September 2012): 152–65. http://dx.doi.org/10.1016/j.cma.2012.05.014.

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Bishop, S. R. "Chemical expansion of solid oxide fuel cell materials: A brief overview." Acta Mechanica Sinica 29, no. 3 (June 2013): 312–17. http://dx.doi.org/10.1007/s10409-013-0045-y.

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Fu, Shan, and Eann Patterson. "Special issue on validation of computational solid mechanics models." Journal of Strain Analysis for Engineering Design 48, no. 1 (January 2013): 3–4. http://dx.doi.org/10.1177/0309324712473553.

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Dissertations / Theses on the topic "Materials Engineering; Computational solid mechanics"

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Zhang, Yingchun. "Computational study of the transport mechanisms of molecules and ions in solid materials." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1711.

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Wang, Chao. "A COMPUTATIONAL STUDY OF LINKING SOLID OXIDE FUEL CELL MICROSTRUCTURE PARAMETERS TO CELL PERFORMANCE." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1377786080.

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Ribeiro-Ayeh, Steven. "Finite element modelling of the mechanics of solid foam materials." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-154.

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Abbasi, Baharanchi Ahmadreza. "Development of a Two-Fluid Drag Law for Clustered Particles Using Direct Numerical Simulation and Validation through Experiments." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2489.

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This dissertation focused on development and utilization of numerical and experimental approaches to improve the CFD modeling of fluidization flow of cohesive micron size particles. The specific objectives of this research were: (1) Developing a cluster prediction mechanism applicable to Two-Fluid Modeling (TFM) of gas-solid systems (2) Developing more accurate drag models for Two-Fluid Modeling (TFM) of gas-solid fluidization flow with the presence of cohesive interparticle forces (3) using the developed model to explore the improvement of accuracy of TFM in simulation of fluidization flow of cohesive powders (4) Understanding the causes and influential factor which led to improvements and quantification of improvements (5) Gathering data from a fast fluidization flow and use these data for benchmark validations. Simulation results with two developed cluster-aware drag models showed that cluster prediction could effectively influence the results in both the first and second cluster-aware models. It was proven that improvement of accuracy of TFM modeling using three versions of the first hybrid model was significant and the best improvements were obtained by using the smallest values of the switch parameter which led to capturing the smallest chances of cluster prediction. In the case of the second hybrid model, dependence of critical model parameter on only Reynolds number led to the fact that improvement of accuracy was significant only in dense section of the fluidized bed. This finding may suggest that a more sophisticated particle resolved DNS model, which can span wide range of solid volume fraction, can be used in the formulation of the cluster-aware drag model. The results of experiment suing high speed imaging indicated the presence of particle clusters in the fluidization flow of FCC inside the riser of FIU-CFB facility. In addition, pressure data was successfully captured along the fluidization column of the facility and used as benchmark validation data for the second hybrid model developed in the present dissertation. It was shown the second hybrid model could predict the pressure data in the dense section of the fluidization column with better accuracy.
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Tofangchi, Mahyari Abbas Ali. "Computational modelling of fracture and damage in poroelastic media." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35426.

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The classical theory of poroelasticity focuses on the coupled response of fluid flow and elastic deformation of porous media saturated with either an incompressible or a compressible pore fluid. The Theory of poroelasticity has been successfully applied to examine time-dependent transient phenomena in a variety of natural and synthetic materials, including geomaterials and biomaterials. The assumption of elastic behaviour of the porous skeleton in these developments is a significant limitation in the application of this theory to brittle geomaterials; which could exhibit non-elastic phenomena either in the form of initiation and extension of discrete fractures, or in the form of initiation and evolution of continuum damage in the porous skeleton. The computational methodology developed in this study examines the effect of development of such defects (fracture or damage) on the fluid transport characteristics and the poroelastic behaviour of saturated geomaterials. The finite element based computational models for fracture and damage phenomena examine two-dimensional plane strain and axisymmetric problems. The classical theory of linear elastic fracture mechanics is extended to examine the timedependent behaviour of local effects at the crack tip in poroelastic media. The numerical procedure accounts for the stress singularity of the effective stress field at the crack tip. The damage model based on the concept of continuum damage mechanics, takes into account the alteration of the stiffness and permeability characteristics of porous material due to development of micromechanical damage in the porous skeleton. The isotropic damage criteria governing the evolution of stiffness and permeability parameters are characterized by the dependency of damage parameters on the distortional strain invariant.
As the applications of the theory of poroelasticity diversify, attention needs to be focused on other aspects of importance. The class of transient and steady crack extension in poroelastic media is recognized as an area of interest in geomechanics applications and in energy resources recovery from geological formations. A computational algorithm is developed to examine the transient quasi-static crack extension in poroelastic media where the temporal and spatial variations of boundary conditions governing the displacement, traction and pore pressure fields are taken into account in the incremental analysis. The path of crack extension is established by a mixed-mode crack extension criterion applicable to the porous fabric. The computational modelling of steady state crack extension in poroelastic media at constant velocity is also examined for the plane strain problems. The finite element formulations of the governing equations, which are velocity-dependent, are developed by employing the Galerkin technique. The poroelastic behaviour of material depends on the propagation velocity at the crack tip. The computational schemes developed in this study followed an extensive procedure of verification via known analytical solutions to poroelasticity problems and for limiting cases of initial undrained (t → 0+) and final drained (t → +infinity) elastic responses recovered through analogous problems in classical elasticity.
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Tang, Baobao. "Development of Mathematical and Computational Models to Design Selectively Reinforced Composite Materials." Thesis, University of Louisiana at Lafayette, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10163313.

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Different positions of a material used for structures experience different stresses, sometimes at both extremes, when undergoing processing, manufacturing, and serving. Taking the three-point bending as an example, the plate experiences higher stress in the middle span area and lower stress in both sides of the plate. In order to ensure the performance and reduce the cost of the composite, placement of different composite material with different mechanical properties, i.e. selective reinforcement, is proposed.

Very few study has been conducted on selective reinforcement. Therefore, basic understanding on the relationship between the selective reinforcing variables and the overall properties of composite material is still unclear and there is still no clear methodology to design composite materials under different types of loads.

This study started from the analysis of composite laminate under three point bending test. From the mechanical analysis and simulation result of homogeneously reinforced composite materials, it is found that the stress is not evenly distributed on the plate based on through-thickness direction and longitudinal direction. Based on these results, a map for the stress distribution under three point bending was developed. Next, the composite plate was selectively designed using two types of configurations. Mathematical and finite element analysis (FEA) models were built based on these designs. Experimental data from tests of hybrid composite materials was used to verify the mathematical and FEA models. Analysis of the mathematical model indicates that the increase in stiffness of the material at the top and bottom surfaces and middle-span area is the most effective way to improve the flexural modulus in three point bending test. At the end of this study, a complete methodology to perform the selective design was developed.

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Dev, Bodhayan. "Characterization of Ceramic/Glass Composite Seals for Solid Oxide Fuel Cells." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1400847202.

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Tran, Hai Thanh. "Experimental and Computational Study on Fracture Mechanics of Multilayered Structures." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6595.

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Many devices in electronics are in the form of multilayered structures. These structures can fail catastrophically if they contain defects or cracks. Enhancing their fracture properties is therefore critical to improve the reliability of the systems. The interface-dominated fracture mechanics of multilayered structure was studied using experiments and finite element (FE) modeling by considering two examples: thin films on polymer substrates in flexible electronics and Cu leadframe/epoxy molding compound (EMC) in micro-electronics packaging. In the first example, aluminum-manganese (Al-Mn) thin films with Mn concentration up to 20.5 at.% were deposited on polyimide (PI) substrates. A variety of phases, including supersaturated fcc (5.2 at.% Mn), duplex fcc and amorphous (11.5 at.% Mn), and completely amorphous phase (20.5 at.% Mn) were obtained by adjusting alloying concentration in the film. In comparison with crystalline and dual phase counterparts, the amorphous thin film exhibits the highest fracture stress and fracture toughness, but limited elongation. Based on a fracture mechanism model, a multilayer scheme was adopted to optimize the ductility and the fracture properties of the amorphous film/PI system. Tensile deformation and subsequent fracture of strained Al-Mn films on PI were investigated experimentally and by FE simulations. It was found that by sandwiching the amorphous film (20.5 at.% Mn) between two ductile copper (Cu) layers, the elongation can be improved by more than ten times, and the interfacial fracture toughness by twenty four times with a limited sacrifice of the film's fracture toughness (less than 18%). This design provides important guidelines to obtain optimized mechanical properties of future flexible electronics devices. The reliability of amorphous brittle Al-Mn (20.5 at.% Mn) thin films deposited on PI substrates is strongly influenced by the film/substrate interface adhesion. Some strategies to improve the adhesion of the interface were conducted, including roughening the surface of the PI substrate, adding a buffer layer and then tuning its thickness. Tensile testing and FE analysis of amorphous Al-Mn thin films with and without buffer layers coated on intact and plasma etched rough PI were investigated. It was found that by adding a chromium buffer layer of 75 nm on a rough PI substrate, the interface adhesion of the film/substrate can increase by almost twenty times. The obtained results would thus shed light on the interfacial engineering strategies for improving interface adhesion for flexible electronics. In the second example, a systematic investigation and characterization of the interfacial fracture toughness of the bimaterial Cu leadframe/EMC was carried out. Experiments and FE simulations were used to investigate delamination and interfacial fracture toughness of the biomaterial system. Two dimensional simulations using computational fracture mechanics tools, such as virtual crack closure technique, virtual crack extension and J-integral proved to be computationally cheap and accurate to find the interfacial fracture toughness of the bimaterial structures. The effects of temperature, moisture diffusion and mode-mixity on the interfacial fracture toughness were investigated. Testing temperature and moisture exposure significantly reduce the interfacial fracture toughness, and its relationship with the mode-mixity was achieved by fitting the results with an analytic formula.
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Giardina, Ronald Joseph Jr. "General Nonlinear-Material Elasticity in Classical One-Dimensional Solid Mechanics." ScholarWorks@UNO, 2019. https://scholarworks.uno.edu/td/2666.

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We will create a class of generalized ellipses and explore their ability to define a distance on a space and generate continuous, periodic functions. Connections between these continuous, periodic functions and the generalizations of trigonometric functions known in the literature shall be established along with connections between these generalized ellipses and some spectrahedral projections onto the plane, more specifically the well-known multifocal ellipses. The superellipse, or Lam\'{e} curve, will be a special case of the generalized ellipse. Applications of these generalized ellipses shall be explored with regards to some one-dimensional systems of classical mechanics. We will adopt the Ramberg-Osgood relation for stress and strain ubiquitous in engineering mechanics and define a general internal bending moment for which this expression, and several others, are special cases. We will then apply this general bending moment to some one-dimensional Euler beam-columns along with the continuous, periodic functions we developed with regard to the generalized ellipse. This will allow us to construct new solutions for critical buckling loads of Euler columns and deflections of beam-columns under very general engineering material requirements without some of the usual assumptions associated with the Ramberg-Osgood relation.
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Asmadi, Aldi. "Crystal structure prediction : a molecular modellling study of the solid state behaviour of small organic compounds." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4441.

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The knowledge of the packing behaviour of small organic compounds in crystal lattices is of great importance for industries dealing with solid state materials. The properties of materials depend on how the molecules arrange themselves in a crystalline environment. Crystal structure prediction provides a theoretical approach through the application of computational strategies to seek possible crystal packing arrangements (or polymorphs) a compound may adopt. Based on the chemical diagrams, this thesis investigates polymorphism of several small organic compounds. Plausible crystal packings of those compounds are generated, and their lattice energies are minimised using molecular mechanics and/or quantum mechanics methods. Most of the work presented here is conducted using two software packages commercially available in this field, Polymorph Predictor of Materials Studio 4.0 and GRACE 1.0. In general, the computational techniques implemented in GRACE are very good at reproducing the geometries of the crystal structures corresponding to the experimental observations of the compounds, in addition to describing their solid state energetics correctly. Complementing the CSP results obtained using GRACE with isostructurality offers a route by which new potential polymorphs of the targeted compounds might be crystallised using the existing experimental data. Based on all calculations in this thesis, four new potential polymorphs for four different compounds, which have not yet been determined experimentally, are predicted to exist and may be obtained under the right crystallisation conditions. One polymorph is expected to crystallise under pressure. The remaining three polymorphs might be obtained by using a seeding technique or the utilisation of suitable tailor made additives.
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Books on the topic "Materials Engineering; Computational solid mechanics"

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Adnan, Ibrahimbegović, and SpringerLink (Online service), eds. Nonlinear Solid Mechanics. Dordrecht: Springer Netherlands, 2009.

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Klaus-Jürgen, Bathe, ed. Computational fluid and solid mechanics 2003: Proceedings, Second MIT Conference on Computational Fluid and Solid Mechanics, June 17-20, 2003. Amsterdam: Elsevier, 2003.

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Doghri, Issam. Mechanics of Deformable Solids: Linear, Nonlinear, Analytical and Computational Aspects. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000.

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Pilkey, Walter D. Mechanics of structures: Variational and computational methods. Boca Raton: CRC Press, 1992.

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1931-, Wunderlich W., ed. Mechanics of structures: Variational and computational methods. Boca Raton: CRC Press, 1994.

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Curnier, Alain. Computational Methods in Solid Mechanics. Dordrecht: Springer Netherlands, 1994.

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Hosford, William F. Solid mechanics. New York: Cambridge University Press, 2010.

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Pin, Tong, ed. Classical and computational solid mechanics. Singapore: World Scientific, 2001.

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Solid mechanics. New York: Cambridge University Press, 2010.

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Hosford, William F. Solid mechanics. New York: Cambridge University Press, 2010.

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Book chapters on the topic "Materials Engineering; Computational solid mechanics"

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Larson, Mats G., and Fredrik Bengzon. "Solid Mechanics." In Texts in Computational Science and Engineering, 257–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33287-6_11.

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Langtangen, Hans Petter. "Solid Mechanics Applications." In Texts in Computational Science and Engineering, 493–537. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55769-9_5.

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Langtangen, Hans Petter. "Solid Mechanics Applications." In Lecture Notes in Computational Science and Engineering, 367–401. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-01170-6_5.

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Brocks, Wolfgang. "Computational Fracture Mechanics." In Continuum Scale Simulation of Engineering Materials, 621–37. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527603786.ch32.

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Bucalem, Miguel Luiz, and Klaus-Jürgen Bathe. "Mathematical models used in engineering structural analysis." In Computational Fluid and Solid Mechanics, 179–365. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-540-26400-2_4.

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Hamouda, A. M. S., and M. S. J. Hashmi. "A Simple Technique for Evaluating Material Constants for Solid Materials for Various Flow Stress Models." In Computational Mechanics ’95, 1767. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79654-8_291.

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Higa, Yoshikazu, Hiroshi Kitagawa, and Yoshihiro Tomita. "Computational Modeling and Characterization of Materials with Periodic Microstructure using Asymptotic Homogenization Method." In Solid Mechanics and its Applications, 255–68. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2111-4_25.

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Maugin, G. A., and S. Imatani. "Material Growth in Solid-Like Materials." In IUTAM Symposium on Computational Mechanics of Solid Materials at Large Strains, 221–34. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-0297-3_20.

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Rajapakse, Yapa D. S. "Onr Solid Mechanics Research Program Overview." In Experimental Analysis of Nano and Engineering Materials and Structures, 23–24. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_11.

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Yagawa, Genki, and Hitoshi Matsubara. "Enriched Element Method and Its Applications to Solid Mechanics." In Computational Methods in Engineering & Science, 15–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-48260-4_2.

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Conference papers on the topic "Materials Engineering; Computational solid mechanics"

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Fowler, Bryce L., and Raymond K. Yee. "Application of Finite Volume Method for Solid Mechanics." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55297.

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Polymers constitute a large class of nearly incompressible solid materials (i.e., Poisson’s Ratio near 0.5). These materials are often used as passive vibration isolators. Accurately modeling vibration isolators made of nearly incompressible materials has been extremely difficult with standard finite element analysis. This paper provides an alternative to the specialized finite element formulations currently used to model incompressible materials. The finite volume methodology of computational fluid dynamics is employed in this paper to solve the Hooke’s Law equations in solid mechanics. Test cases have been performed to evaluate the performance of finite volume method applied to solid mechanics problems. The formulation has been coded in Matlab for practical use. Based on the preliminary test case results, the finite volume formulation compares favorably to finite element method.
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Nagchaudhuri, Abhijit, and Emin Yilmaz. "Design Experience Using Software Tools in Undergraduate Engineering Mechanics Courses." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69242.

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Statics, Dynamics, and Mechanics of Materials form the basic sequence of engineering mechanics courses in engineering curricula. Traditionally, these courses have been designated as “engineering science” courses with significantly more emphasis in analysis to reinforce engineering fundamentals, and little to no importance to “engineering design”. With the outcome based approach to undergraduate engineering education adopted by Accreditation Board of Engineering and Technology and the framework laid out by Engineering Criteria (EC 2000) significant reform efforts are underway to incorporate design experience throughout the engineering curricula. Most engineering programs across the nation have developed and implemented a freshman design course to introduce engineering design at the beginning of the college experience for engineering majors. To sustain the momentum, it therefore follows that subsequent courses should sustain the design emphasis in the freshman and sophomore years. Design, however, is a time consuming complex iterative process somewhat different from the convergent nature of engineering science. Modern software tools provide a time efficient and pedagogically effective way of integrating engineering design project with the engineering mechanics sequence without compromising the engineering science fundamentals. In this paper design projects that have been integrated in Statics, Dynamics, and Mechanics of Material courses offered by the author using software tools such as Working Model, MD-Solids, Pro-Engineer, Solid-works etc. supplemented by computational tools such as MATLAB and EXCEL are outlined. Discussion based on student feedback and relevance to ABET outcomes is also forwarded.
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Scotti, Christine M., Ender A. Finol, Siddharth Viswanathan, Aleksandr Shkolnik, Elena S. DiMartino, David A. Vorp, and Cristina H. Amon. "Computational Fluid Dynamics and Solid Mechanics Analyses of a Patient-Specific AAA Pre- and Post-EVAR." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62352.

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The establishment of a new pathway for blood flow immediately following endovascular aneurysm repair (EVAR) results in morphological changes and remodeling of the aneurismal sac. While EVAR is a minimally invasive surgical intervention, failure of the endovascular graft (EVG) may occur in which there is downstream migration and endoleak formation, creating a repressurization of the aneurismal sac and an increased risk of rupture. While the mechanism of aneurysm rupture and EVG failure is fundamental in nature, the factors that most significantly contribute to the end result are not yet fully understood. Mechanically, both are the consequence of an exerted force or disturbance exceeding the strength of a given material, whether it is the aneurismal arterial wall or the interaction that exists between the graft and wall. Embedded within this causal relationship are the contributions of arterial wall remodeling, intraluminal thrombus formation, and the dynamics that exists within the lumen. Several studies have been performed to examine these factors individually as they affect shear stress, the development of vortices, and the mechanical stress experienced along the arterial wall. However, a complete investigation is needed to study an anatomically realistic geometry operating under physiological conditions. The computational analyses conducted in this investigation address the confluence of these factors as they are modeled within an accurate patient-specific abdominal aortic aneurysm (AAA) reconstructed from CT scan data prior to and after EVAR. Our results verify the pressure-dominated characteristic of the flow and the negligible contribution of the dynamic and frictional force components; both are in good agreement with previously published results for analytical estimation of flow-induced forces in EVGs. [1]
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Gibson, Phillip W., and Majid Charmchi. "Application of Computational Fluid Dynamics to Protective Clothing System Evaluation." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1570.

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Abstract Convection, diffusion, and phase change processes influence heat and mass transfer through textile materials used in clothing systems. For example, water in a hygroscopic porous textile may exist in vapor or liquid form in the pore spaces or in bound form when it has been absorbed by the solid phase, which is typically some kind of hydrophilic polymer. Phase changes associated with water include liquid evaporation/condensation in the pore spaces and sorption/desorption from hydrophilic polymer fibers. Certain materials such as encapsulated paraffins may also be added to textiles; these materials are designed to undergo a solid-liquid phase change over temperature ranges near human body temperature, which influences the perceived comfort of clothing. Additional factors such as the swelling of the solid polymer due to water imbibition, and the heat of sorption evolved when the water is absorbed by the polymeric matrix, can all be incorporated into the appropriate conservation and transport equations describing heat and mass transfer through clothing layers. These physical factors, nonlinear material properties, and complex multiphase flows make the task of modeling and predicting levels of protection and comfort of various clothing designs difficult and elusive. Computational fluid dynamics (CFD) has proven to be useful at several levels of material and system modeling to evaluate and design protective clothing systems and material components. This paper summarizes current and past work aimed at utilizing CFD techniques for protective clothing applications.
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Renaud, Adrien, and Thomas Heuzé. "A DISCONTINUOUS GALERKIN MATERIAL POINT METHOD (DGMPM) FOR THE SIMULATION OF IMPACT PROBLEMS IN SOLID MECHANICS." In 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2017. http://dx.doi.org/10.7712/120117.5678.17188.

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Shi, Jianxu, and Roger G. Ghanem. "Stochastic Modeling of Cracked Solids and the Related Size Effects." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28070.

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This paper examines the crack size effect of homogenization and microstructure on the materials. It is proposed that the size of the microstructure should not only affect the mean response of the material, which would correspond to the conventional deterministic concept of material size effect, but should also affect its whole probabilistic structure. As an example, a non-stationary stochastic tensor field is characterized as an equivalent continuum model of a solid medium with a random distribution of micro-cracks. The crack size dependence of the variance and covariance functions of the tensor field is verified and fitted to a proposed functional form. Once the correlation structure is determined, the corresponding stochastic field can be synthesized and standard computational algorithms can then be used to predict the behavior of the material.
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Tian, F. B., H. Dai, H. Luo, J. F. Doyle, and B. Rousseau. "Computational Fluid–Structure Interaction for Biological and Biomedical Flows." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16408.

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In this paper, we describe a three-dimensional (3D) computational approach for computing the fluid–structure interaction (FSI) encountered in biological and biomedical flows. The approach combines a Cartesian grid based immerse-boundary method for the viscous incompressible flow and a finite-element method for the solid body mechanics. The separate subroutines of the finite-element method can handle general 3D bodies as well as thin-wall structures such as frames, membranes, and plates. Furthermore, both geometric nonlinearity due to large displacements and large rotations and material nonlinearity due to hyperelasticity have been incorporated. The flow and the solid body are meshed separately, and as the body deforms, no mesh regeneration is needed. The FSI solver has been validated against previous numerical and experimental studies. Applications in insect flight and vocal fold vibration have been demonstrated.
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de Lemos, Marcelo J. S., and Nicolau B. Santos. "Turbulent Heat Transfer in Channels With Solid and Porous Baffles." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81505.

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Simulations are presented for turbulent flow in a channel containing baffles made with solid and porous materials. The equations of mass continuity, momentum and energy are written for an elementary representative volume yielding a set of equations valid for the entire computational domain. These equations are discretized using the control volume method and the resulting system of algebraic equations is relaxed with the SIMPLE method. The presented numerical results for the friction factor f and for the Nusselt number Nu were compared with available data. Further simulations comparing the effectiveness of the porous material used showed that no advantages are obtained when using low porosity baffles in the turbulent flow regime.
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Holzapfel, Gerhard A., Christian A. J. Schulze-Bauer, and Michael Stadler. "Mechanics of Angioplasty: Wall, Balloon and Stent." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1927.

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Abstract Studying the solid mechanics of angioplasty provides essential insight in the mechanisms of angioplasty such as overstretching the disease-free tissue, plaque disruption or dissection, redistribution inside the wall and lipid extrusion etc. We desribe our current understanding of the mechanics of angioplasty based on the example of a human iliac artery with an eccentric stenosis. We outline a new approach which has the potential to improve interventional treatment planning, to predict the balloon and stent-induced wall stresses as well as the dilation success. In particular, we use MRI to obtain accurate geometrical data for the vessel wall and plaque architecture and to identify their different types of soft (biological) tissues and calcifications. One issue is to characterize the quasistatic stress-strain response of these components in both axial and circumferential directions. We present new experimental results showing strong nonlinearity and anisotropy. Another issue is to identify predominant directions of each component by analyzing orientations of cellular nuclei. The morphological and mechanical information is used for the elastoplastic constitutive model designed to capture the finite strains of the stenotic artery during angioplasty. The three-dimensional model is fitted to the experimental data. Associated material parameters, corresponding to the different tissues of the stenosis, are presented. The numerical part outlines briefly the concept of the finite element model and, based on a computational structural analysis, discusses the mechanism of angioplasty for the considered type of stenosis.
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Ahmadi, Eisa, M. M. Aghdam, and Nasrin Sheikhy. "A New Truly Meshless Method for Heat Conduction in Solid Structures." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40615.

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In this study a new meshless method is presented for the analysis of heat transfer in heterogeneous solid structures. The presented meshless method is based on the integral form of energy equation for the sub-particles in the domain of the material. A micromechanical model based on the presented meshless method is presented for analysis of heat transfer, temperature distribution and steady-state effective thermal conductivities of fiber-matrix type of composite materials. Because the domain integration is eliminated in the presented meshless formulation, the computational efforts in presented method are decreased substantially. A small area of the composite system called the representative volume element (RVE) is considered as the solution domain. The fully bonded fiber-matrix interface is considered and contact thermal resistant is neglected in the fiber-matrix interface and so the continuity of temperature and reciprocity of heat flux is satisfied in the fiber-matrix interface. A direct interpolation method is employed for enforcement the appropriate boundary conditions to the RVE. Numerical results are presented for temperature distribution, heat flux and thermal conductivity. Numerical results show that presented meshless method is simple, effective, accurate and less costly method in micromechanical modeling of heat conduction in heterogeneous materials.
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