Johnson Cook
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Slow Cook-Off Simulation of PBX Based on RDX
ABSTRACT: Cook-off tests are commonly used to assess thermal behaviour of energetic materials under external thermal stimuli. Numerical simulation became a powerful tool to reduce the costs with experimental tests. However, numerical simulations are not able to predict the violence of thermal response, but instead accurately reproduce radial heat flow in the
J. Aerosp. Technol. Manag.. Publicado em: 2017-06
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2. Investigation of High-Speed Cryogenic Machining Based on Finite Element Approach
Abstract The simulation of cryogenic machining process because of using a three-dimensional model and high process duration time in the finite element method, have been studied rarely. In this study, to overcome this limitation, a 2.5D finite element model using the commercial finite element software ABAQUS has been developed for the cryogenic machining proc
Lat. Am. j. solids struct.. Publicado em: 2017-03
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3. The strain-rate effect of engineering materials and its unified model
The test data of metals, brittle materials and polymers in high, medium and low strain-rate range were summarized. It was found that the dynamic strength or yield stress of these materials was not sensitive to strain-rate in the low and high strain-rate range (corresponding to weak sensitivity area and saturated zone). But in the medium strain-rate range (st
Lat. Am. j. solids struct.. Publicado em: 2013-07
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4. Evaluation of properties and FEM Model of the Friction welded mild Steel-Al6061-Alumina
Evaluation of mechanical and interfacial properties of friction welded alumina-mild steel rods with the use of Al6061 sheet are presented in this work. SEM, EDX analysis, hardness and bending strength tests were conducted. The bonds were attained through interfacial interlocking and intermetalllic phase formation with average bending strengths in the range o
Mat. Res.. Publicado em: 18/12/2012
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5. Modelagem numérica de impacto em concreto armado utilizando o método dos elementos finitos
Este trabalho apresenta o modelamento da resposta dinâmica do concreto armado, quando impactado por projéteis cônicos, ogivais e semi-esféricos, utilizando-se o Método de Elementos Finitos. Foram utilizados os modelos de material JH2 e Johnson-Cook para modelar o comportamento do concreto e do projétil, respectivamente. Foram utilizados resultados da l
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/12/2011
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6. Finite element simulations of Ti6Al4V titanium alloy machining to assess material model parameters of the Johnson-Cook constitutive equation
The machining of titanium alloys poses several inherent difficulties owing to their unique mechanical properties and cutting characteristics. Finite element (FE) simulations have reduced the burden of extensive experimental trials in understanding the deformation behavior and optimize the cutting process. The FE code relies on the qualitative nature of input
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-06
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7. Numerical simulations and experiments of vehicle structures under low speed crash loadings to evaluate fracture models. / Modelos de falha em análise numérica de estrutura veicular submetida a impacto de baixa velocidade.
O presente trabalho visa o estudo e avaliação de diversos modelos de falha através de ensaios experimentais e análises numéricas. A caracterização do material foi feita por meio de ensaios de tração de espécimes com e sem entalhe e de cisalhamento, para prover dados em uma ampla faixa de triaxialidade. A calibração dos parâmetros necessários pa
Publicado em: 2010
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8. 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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9. Inverse modeling and shape optimization of an energy absorber / Modelamento inverso e otimização de forma de um absorvedor de impacto
This work presents a shape optimization methodology applied to structures submitted to impact loads in order to improve their crashworthiness. To this end, it is necessary to know the structural material properties, which were obtained using a dual experimental-optimization methodology. Optimum parameters are obtained for the Cowper-Symonds and Johnson-Cook
Publicado em: 2007