Strains And Stresses
Mostrando 13-24 de 130 artigos, teses e dissertações.
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13. Size-dependent thermoelasticity
In this paper a consistent theory is developed for size-dependent thermoelasticity in heterogeneous anisotropic solids. This theory shows that the temperature change can create not only thermal strains, but also thermal mean curvatures in the solids. This formulation is based on the consistent size-dependent continuum mechanics in which the couple-stress ten
Lat. Am. j. solids struct.. Publicado em: 2014
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14. Analysis of laminated composite skew shells using higher order shear deformation theory
Static analysis of skew composite shells is presented by developing a C0 finite element (FE) model based on higher order shear deformation theory (HSDT). In this theory the transverse shear stresses are taken as zero at the shell top and bottom. A realistic parabolic variation of transverse shear strains through the shell thickness is assumed and the use of
Lat. Am. j. solids struct.. Publicado em: 2013-09
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15. Effect of parametric uncertainties on the performance of a piezoelectric energy harvesting device
The use of piezoelectric materials for the development of electromechanical devices for the harvesting or scavenging of ambient vibrations has been extensively studied over the last decade. The energy conversion from mechanical (vibratory) to electrical energy is provided by the electromechanical coupling between mechanical strains/stresses and electric char
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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16. Molecular analysis endophytic bacteria from the genus Bacillus isolated from tropical maize (Zea mays L.).
Endophytíc bacteria play an important role in agriculture by improving plant performance and adaptation against biotic and abiotic stresses. In the present study molecular methods were used for identifying Bacillus endophytic bacteria isolated from Brazilian sweet corn. SDS-PAGE of whole-cell protein extract of forty-two isolates revealed a high number of s
Brazilian Journal of Microbiology. Publicado em: 2011
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17. Constitutive model for bimodular elastic damage of concrete
An elastic damage model for concrete has been proposed considering damage-induced bimodularity. A scalar damage parameter has been chosen to quantify the damage. Expressions for the material compliance tensor components have been derived from the assumed strain and complementary energy functions stated in terms of the principal stresses and strains. Incremen
Latin American Journal of Solids and Structures. Publicado em: 2010
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18. Structural damage identification via accoustic wave propagation approach using computational intelligence techniques / Identificação de dano estrutural via abordagem de propagação de ondas acústicas utilizando técnicas de inteligência computacional
No presente trabalho, um algoritmo algébrico sequencial é utilizado para descrever a propagação de ondas acústicas ao longo de uma barra e utilizado na identificação de danos. Esse algoritmo é validado com base nos conficientes de sensibilidade dos ecos correspondentes aos diferentes cenários de danos apresentados. Na formulação do problema de ide
Publicado em: 2010
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19. RizobactÃrias para o tratamento de sementes: seleÃÃo, eficiÃncia em campo e modos moleculares de aÃÃo. / Rhizobacteria for cotton seed treatment: screening, field efficacy and molecular modes of action
Rhizobacteria may act on eradication of seed-associated pathogens and plant protection against biotic and abiotic stresses. The present work aimed to select rhizobacteria to control cotton diseases and assess the molecular modes of action involved. A total of 368 rhizobacteria were tested for the controlo f damping-off and bacterial blight by treating infect
Publicado em: 2009
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20. Factors predicting the shrinkage stress for Class I bonded restorations interface / Fatores preditores da tensão de contração para interfaces de restaurações adesivas em cavidade de classe I
OBJECTIVES: The C-Factor is normally used to predict the shrinkage stress at composite-tooth interfaces. A study was outlined for clarifying the elements which allows providing the stress at bonded restorations interface. Theoretically, the stress varies as a function of the opposition to the shrinkage (substrate stiffness), the compliance, dimensions and me
Publicado em: 2009
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21. Analysis of stress in thin plates of composite materials under dynamic load using the boundary element method / Analise de tensões em placas finas de materiais compositos sob carregamento dinamico usando o metodo dos elementos de contorno
This work presents a dynamic formulation of the boundary element method for stress and failure criterion analyses of anisotropic thin plates. Formulations use elastostatic fundamental solutions and inertia terms are treated as body forces. Domain integrals that come from body forces are transformed into boundary integrals using the radial integration method
Publicado em: 2009
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22. Uma contribuição para o estudo das deformações residuais proporcionadas pelo processo de usinagem por fresamento. / A contribution for residual deformation study originated by the face milling machining process.
The face milling operation purpose is providing flat machined surfaces free from residual strains at the cross section of the workpiece. On the other hand, the evidences presented in this thesis are enough to demonstrate that the strain exists and its behavior can be related to technical measurements such as the cutting tool helical profile, the feed rate, t
Publicado em: 2009
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23. Estudo da recristalização dinâmica do aço inoxidável austenítico F 138, utilizado em próteses ortopédicas
In order to analyze the microstructure and to know the dynamic softening mechanics that take place during the hot work in F 138 stainless steel, physical simulation was carried out through continuous isothermal hot torsion tests in a wide range of temperatures and strain rates, covering the real conditions of processing used in the manufacture of orthopedic
Publicado em: 2009
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24. Estado viável não cultivável em Salmonella enterica: indução, perfil de proteínas intracelulares e detecção de mRNA / Viable but nonculturable state in Salmonella enterica: induction, intracellular protein profile, and mRNA detection
The foodborne pathogen Salmonella spp. enters into a viable but nonculturable state (VBNC) in response to adverse environmental conditions. The presence of VBNC cells is a public health concern since it may be overlooked under standard routine laboratory procedure, resulting in improper assessment of contaminating pathogens in food. This work was done to inv
Publicado em: 2009