Modeling and optimization of ultrasonic devulcanization using the response surface methodology based on central composite face-centered design

Mangili, Ivan; Lasagni, Marina; Huang, Keyuan; Isayev, A. I.

doi:10.1016/j.chemolab.2015.03.003

Cited by 64 publications

(31 citation statements)

References 39 publications

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“…[26][27][28] Box-Behnken designs are experimental designs for RSM and are effective at identifying first and second coefficients. 29 In each block design, a certain number of factors are examined for all combinations of a factorial design, whereas other factors are kept at central values.…”

Section: Box-behnken Design For the Response Surface Methodologymentioning

confidence: 99%

Optimal design of a pipe isolation plugging tool using a computational fluid dynamics simulation with response surface methodology and a modified genetic algorithm

Hong

2017

Advances in Mechanical Engineering

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In this work, the flow effects on an isolation plugging tool in a pipeline were numerically investigated using computational fluid dynamics. The study focused on optimal parameter design for the isolation plugging tool, which reduced the unsteady force effects on the x and y directions of the flow field. First, three-dimensional models of the isolation plugging tool and pipe were built. The velocity, pressure, and force analysis on the flow past the isolation plugging tool were investigated via computational fluid dynamics simulation. Second, a combination of design parameter ratios was selected using the Box-Behnken method for a series of numerical experiments. From the simulation results, three regression total force models were determined for the x, y, and z directions using response surface methodology. A modified genetic algorithm was proposed to optimize the design parameter ratios for the isolation plugging tool based on the regression models. The optimum parameter ratios were chosen and verified using the simulation results.

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Section: Box-behnken Design For the Response Surface Methodologymentioning

confidence: 99%

Optimal design of a pipe isolation plugging tool using a computational fluid dynamics simulation with response surface methodology and a modified genetic algorithm

Hong

2017

Advances in Mechanical Engineering

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“…These processes are rarely finding sufficient results to compete with the methods of re-use as co-processing, granulation and rolling, which in turn does not reutilize much of the energy potential in NR from tires 2,3 . Among the main devulcanization methods currently searched, highlights processing by ultrasound 4,5 , microwave 6,7 , chemical method 8 , biological treatment 9 and thermomechanical 10,11 . Currently, two relevant theories attempt to explain the mechanisms of crosslink selective breaking.…”

mentioning

confidence: 99%

Devulcanization of Natural Rubber in Composites with Distinct Crosslink Densities by Twin-Screw Extruder

2017

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In this study, the effects of the devulcanization process realized by an intermeshing co-rotating twin-screw extruder (ICTSE) on three vulcanized Natural Rubber (NR) composites with different crosslink densities (CD) have been investigated. The extrusion parameters were fixed, as well as the initial material granulometry and auxiliary thermoplastic added to the process. After composites vulcanization, they were characterized accordingly their soluble fraction (SF), crosslink density (CD), mechanical properties and thermogravimetry (TGA). The extrusion was performed on the vulcanized elastomers pursuing selectively crosslink rupture and the same characterization previously cited was conducted on the devulcanized material, except the mechanical properties analysis. The extrusion demonstrate effective devulcanization, evidenced in the increasing of soluble fractions, reduction in crosslink density and thermal stability gain. These results are directly affected by preliminary differences on materials structure and presence of ethylene vinyl-acetate (EVA) on extrusion.

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“…A análise dos resíduos, mostrada na Figura 4, sugere que os erros possuem distribuição normal e padrão de comportamento satisfatório [9], não revelando anormalidades [16]. As três amostras escolhidas com posições aleatórias na superfície foram: deformação, temperatura e tempo, respectivamente, A) 0%, 210°C e 40 min; B) 2%, 210°C e 20 min; C) 8%, 200°C, 40 min.…”

Section: Resultsunclassified

“…Foram utilizadas deformações no intervalo de 0% a 9% em tração, temperatura de envelhecimento entre 140°C a 210°C e o tempo de 5 min a 45 min. Estes valores compreendem os valores tipicamente utilizados na indústria automotiva para painéis externos e para o processo de pintura da carroceria [2][3][4] [9,16].…”

Section: Planejamento Do Experimentounclassified

Influência Da Pré-Deformação Plástica, Da Temperatura E Do Tempo De Aquecimento No Envelhecimento Do Aço Bh220 Através De Planejamento De Experimentos

Ferreira¹,

Magalhães²,

Carneiro³

et al. 2017

Tecnologia Em Metalurgia Materiais E Mineração

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ResumoAços Bake Hardening são aços laminados a frio com envelhecimento controlado. Estes aços caracterizam-se pela boa conformação e por apresentarem aumento de resistência mecânica devido à deformação e ao envelhecimento por tratamento térmico. Nesse trabalho corpos de prova de tração do material BH220 foram submetidos à pré-deformações que variam de 0% a 9% por tração uniaxial e posteriormente submetidos a tratamento térmico realizado em temperaturas que variam de 140°C a 210°C com tempos de aquecimento entre 5 minutos e 45 minutos. Foi confirmado que as temperaturas de envelhecimento, na faixa estudada, alteraram a variação do limite de escoamento devido ao fenômeno de difusão que é termicamente ativado. Verificou-se que o tempo de aquecimento, dentro do intervalo testado, não causou grandes variações nos resultados e a deformação foi a variável que maior contribuiu para o aumento de propriedade mecânica. Palavras-chave: Aço BH220; Bake hardening; Work hardening; Planejamento de experimentos. INFLUENCE OF PLASTIC PRE DEFORMATION, TEMPERATURE AND HEATING TIME IN THE AGING TREATMENT OF THE BH220 STEEL THROUGH DESIGN OF EXPERIMENTS AbstractBake Hardening steels are cold rolled steels with controlled aging. These steels are characterized by a good formability and an increase in the strength due to the aging that occurs during heat treatment. In this study, tensile test specimens of the BH200 steel were submitted to pre deformations ranging from 0% to 9% by uniaxial tension, subsequently they were subjected to an aging heat treatment performed at temperatures varying from 140°C to 210°C, in heating times between 5 minutes and 45 minutes. It has been confirmed that the aging temperatures, in the range studied, modified the yield point due to the phenomenon of diffusion, which is thermally activated. In the results, it is possible to verify that the heating time, within the range tested, it is not significant and the deformation was the largest variable that contributed to the increase of mechanical properties.

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Modeling and optimization of ultrasonic devulcanization using the response surface methodology based on central composite face-centered design

Cited by 64 publications

References 39 publications

Optimal design of a pipe isolation plugging tool using a computational fluid dynamics simulation with response surface methodology and a modified genetic algorithm

Optimal design of a pipe isolation plugging tool using a computational fluid dynamics simulation with response surface methodology and a modified genetic algorithm

Devulcanization of Natural Rubber in Composites with Distinct Crosslink Densities by Twin-Screw Extruder

Influência Da Pré-Deformação Plástica, Da Temperatura E Do Tempo De Aquecimento No Envelhecimento Do Aço Bh220 Através De Planejamento De Experimentos

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