Dynamic Geometry
Mostrando 13-24 de 105 artigos, teses e dissertações.
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13. Crashworthiness Analysis of S-Shaped Structures Under Axial Impact Loading
Abstract To mitigate shock forces in collision events, thin-walled members are used as energy absorber. In this article, crashworthiness of single-cell and multi-cell S-shaped members with various cross-sections including triangular, square, hexagonal, decagon and circular were investigated under axial dynamic loading using finite element code LS-DYNA. Furth
Lat. Am. j. solids struct.. Publicado em: 2017-06
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14. Stability Analysis of Variable Stiffness Composite Laminated Plates with Delamination Using Spline-FSM
Abstract The dynamic behavior of variable stiffness composite laminated (VSCL) plate with curvilinear fiber orientation subjected to in-plane end-loads is investigated. A variable stiffness design can increase the laminated composite structural performance and also provides flexibility for trading-offs between various structural properties. In each ply of th
Lat. Am. j. solids struct.. Publicado em: 2017-03
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15. A Stochastic Reliability Model for Application in a Multidisciplinary Optimization of a Low Pressure Turbine Blade Made of Titanium Aluminide
Abstract Currently, there are a lot of research activities dealing with gamma titanium aluminide (γ-TiAl) alloys as new materials for low pressure turbine (LPT) blades. Even though the scatter in mechanical properties of such intermetallic alloys is more distinctive as in conventional metallic alloys, stochastic investigations on γ -TiAl alloys are very ra
Lat. Am. j. solids struct.. Publicado em: 2016-12
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16. Tip Deflection Determination of a Barrel for the Effect of an Accelerating Projectile Before Firing Using Finite Element and Artificial Neural Network Combined Algorithm
Abstract For realistic applications, design and control engineers have limited modelling options in dealing with some vibration problems that hold many nonlinearity such as non-uniform geometry, variable velocity loadings, indefinite damping cases, etc. For these reasons numerous time consuming experimental studies at high costs must be done for determining
Lat. Am. j. solids struct.. Publicado em: 2016-10
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17. A comparison of two reciprocating instruments using bending stress and cyclic fatigue tests
The aim of this study was to comparatively evaluate the bending resistance at 45º, the static and dynamic cyclic fatigue life, and the fracture type of the WaveOne (Dentsply Maillefer, Ballaigues, Switzerland) 25-08 and Reciproc (VDW, Munich, Germany) 25-08 instruments. A total of 60 nickel-titanium (NiTi) instruments (30 Reciproc and 30 WaveOne) from three
Braz. oral res.. Publicado em: 20/10/2015
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18. Effects of CFRP retrofit on impact response of shear-deficient scaled reinforced concrete beams
An experimental procedure is carried out to investigate response features of semi-deep reinforced concrete (RC) beams with dominant static shear failure subjected to low-velocity impact dynamic load both in intact and retrofitted cases. Built specimens have scaled geometry and material properties preserving physical similarity with full-scale members and are
Lat. Am. j. solids struct.. Publicado em: 2015-01
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19. Damage of plates due to impact, dynamic pressure and explosive loads
It is the purpose of this article to present design equations which can be used to predict the damage of ductile plating when subjected to mass impact, dynamic pressure or impulsive loadings. The external loadings are sufficiently severe to produce inelastic material behaviour and produce finite transverse displacement, or geometry change, effects. The damag
Lat. Am. j. solids struct.. Publicado em: 2013-07
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20. Maximization of Fundamental Frequency of Laminated Composite Cylindrical Shells by Ant Colony Algorithm
ABSTRACT: The success in developing modern aerospace systems addresses competitive subjects as optimization, reduced costs, sustainability, environment, weight, and safety. There is an increased demand for lighter materials such as laminated composites. In order to match the demand of aeronautical companies, the shell structures are very important. The dynam
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
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21. AvaliaÃÃo do software geogebra como instrumento psicopedagÃgico de ensino em geometria / Evaluation of geogebra software as psycho-pedagogic and learning approach to geometry
This current study presents the assessment on Geogebra free software for teaching geometry, as a psycho-pedagogical approach, highlighting resources that facilitate integration and use of program with professors and studentsâ learning topics. The software can be applied from earlier primary-school students to college ones as well as distance education progr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/04/2012
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22. Instrumentos virtuais de desenho e a argumentação em geometria
This dissertation presents a proposal to work, at school, the deductive reasoning in geometry. The proposal makes use of digital material consisting of virtual drawing tools that perform geometric transformations of translation, reflection, rotation and enlargement. Making use of digital material, it was developed a didactic sequence consists of three stages
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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23. Geometria dinâmica no ensino de transformações no plano : uma experiência com professores da educação básica
Nesta dissertação apresentamos a concepção, implementação e validação de uma proposta para o ensino de transformações geométricas no plano usando o ambiente de geometria dinâmica GeoGebra. A proposta integra Geometria e Arte através da construção de pavimentações do plano e de mosaicos de Escher e foi dirigida para professores do ensino fund
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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24. Uma proposta de ensino da trigonometria com uso do sofware GeoGebra
Esta dissertação apresenta uma proposta de ensino da Trigonometria para estudantes do Ensino Médio, baseada na utilização do software GeoGebra. Seu principal objetivo é avaliar a aprendizagem da Trigonometria propiciada por uma sequência de ensino desenvolvida em um ambiente informatizado e dinâmico. A metodologia utilizada na pesquisa foi o estudo d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012