Linear And Nonlinear Elasticity
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Uma abordagem experimental e numérica para determinação de curvas de compressão para concreto simples e reforçados com fibras de aço
RESUMO A curva tensão-deformação do concreto é importante para o dimensionamento de estruturas, pois por meio dela é possível obter sua resistência à compressão, sua deformação de pico, o módulo de elasticidade e a tenacidade do concreto. Entretanto, essa é uma propriedade que não é comumente determinada nos ensaios de controle de qualidade do
Matéria (Rio J.). Publicado em: 16/09/2019
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2. Free vibration analysis of nano-tubes consisted of functionally graded bi-semi-tubes by a two-steps perturbation method
Abstract Free vibration of a bimaterial circular nano-tube is investigated. The tube is formed by bonding together a Si3N4/SUS304 functionally graded upper semi tube and a ZrO2/Ti-6Al-4V functionally graded lower semi tube. The material properties of the tube are assumed to vary along the radius according to power law with the power index of upper semi tube
Lat. Am. j. solids struct.. Publicado em: 04/02/2019
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3. A finite element study on the mechanical behavior of reciprocating endodontic files
AIM: To evaluate the mechanical behavior of reciprocating endodontic files, comparing nickel-titanium NiTi and stainless steel 316L St.St. 316L as manufacturing material for such instruments. METHODS: A three-dimensional finite element model was designed for this study. The simplified instrument model geometry was created on commercial CAD/CAM software. Rea
Braz. J. Oral Sci.. Publicado em: 2015-03
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4. Successive linear approximation for finite elasticity
A method of successive Lagrangian formulation of linear approximation for solving boundary value problems of large deformation in finite elasticity is proposed. Instead of solving the nonlinear problem, by assuming time steps small enough and the reference configuration updated at every step, we can linearize the constitutive equation and reduce it to linear
Computational & Applied Mathematics. Publicado em: 2010
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5. Boundary element method formulation for reinforced porous material / Formulação do método dos elementos de contorno para materiais porosos reforçados
In this work a nonlinear formulation of the boundary element method (BEM) is proposed to deal with saturated and unsaturated poro-elasto-plastic 2D reinforced domains. To model reinforced porous domains a BEM/FEM (Finite Element Method) modified coupling technique is employed. The coupling is made by using the least square method to regularize the displaceme
Publicado em: 2008
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6. EFFICIENCY ASSESSMENT OF ADVANCED MODAL ANALYSIS AS COMPARED TO TECHNIQUES BASED ON NUMERICAL INVERSE TRANSFORMS / COMPARAÇÃO DO DESEMPENHO COMPUTACIONAL DA TÉCNICA DE SUPERPOSIÇÃO MODAL AVANÇADA COM TÉCNICAS DA TRANSFORMADA DE LAPLACE
An established technique to solve time-dependent problems is the formulation of a complete frequency-domain analysis via Laplace or Fourier transforms, with subsequent ad hoc expression of results by numerical inversion. Although usually easy to implement, such a transform inversion is computationally intensive, if accurate results are desired, and liable to
Publicado em: 2008
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7. Sobre metodologias de modelagem computacional de propagação de trincas por fadiga em fuselagens aeronáuticas. / On computacional modeling methodologies of fatigue crack propagation in aircraft fuselages.
A methodology for modeling fatigue crack growth in pressurized, stiffened, thin shell structures is implemented within a software framework that consists of a fracture simulation code associated with a finite element analysis code. Crack trajetories are allowed to be arbitrary and are computed incrementally as a part of the simulation. Trajectories are repre
Publicado em: 2007
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8. Simulação numérica do comportamento pós-fissuração de vigas de concreto armado pelo método dos elementos finitos / Numerical simulation for the post-cracking behavior of reinforced concrete beams by finite element method
This work presents a numerical method for the evaluation of internal forces and displacements in reinforced concrete straight beams considering cracking and the influence of longitudinal and transversal reinforcement. In order to simulate cracking behavior, the elasticity module of the cracked element is reduced depending on the dimensions of the finite elem
Publicado em: 2007
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9. Topological sensivity analysis in problems with geometric non-linearities and nonlinear nearly-incompressible hiperelasticity / Analise de sensibildade topologica em problemas de não-linearidade geometrica e hiperelasticidade não-linear quasi-incompressivel
The aim of the present work is to optimize the topology of elasticity problems with geometric nonlinearities (large displacement and rotation) and material nonlinearities, in this case, nonlinear nearly-incompressible hyperelasticity applying the concept of Topological Sensitivity Analysis (TSA) and a total Lagrangian formulation. The TSA results in a scalar
Publicado em: 2006
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10. The degree of nonlinearity and anisotropy of blood vessel elasticity
Blood vessel elasticity is important to physiology and clinical problems involving surgery, angioplasty, tissue remodeling, and tissue engineering. Nonlinearity in blood vessel elasticity in vivo is important to the formation of solitons in arterial pulse waves. It is well known that the stress–strain relationship of the blood vessel is nonlinear in genera
The National Academy of Sciences of the USA.
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11. Passive biaxial mechanical properties of isolated canine myocardium.
Excised sheets of canine myocardium were subjected to cyclic loading and unloading in the predominant fibre and cross-fibre directions to determine passive mechanical properties. Myocardium under biaxial loading exhibits both non-linear elasticity and viscoelasticity with some strain-rate dependence in the position of the stress-strain relations, but very li
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12. Nonlinear elasticity, proteinquakes, and the energy landscapes of functional transitions in proteins
Large-scale motions of biomolecules involve linear elastic deformations along low-frequency normal modes, but for function nonlinearity is essential. In addition, unlike macroscopic machines, biological machines can locally break and then reassemble during function. We present a model for global structural transformations, such as allostery, that involve lar
National Academy of Sciences.