Geometrical evaluation of a resin infusion process by means of constructal design

Lorenzini, Giulio; Nardi, Maurício; Amico, Sandro Campos; Isoldi, Liércio André; Rocha, Luíz Alberto Oliveira; Souza, Jeferson Ávila; Santos, Elizaldo Domingues dos

doi:10.18280/ijht.34sp0113

Cited by 3 publications

(2 citation statements)

References 19 publications

(26 reference statements)

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“…Simulations are considered converged when the residuals are lower than R < 10 -6 . It is important to mention that the present computational model was verified by the authors in previous works, see [5,29]. For the time discretization, it is applied a variable time step in the range 1.0 × 10 -3 s ≤ Δt ≤ 1.0 s. The variable time step is based on the maximum Courant number near the VOF interface.…”

Section: Numerical Procedures and Spatial Discretizationmentioning

confidence: 84%

Constructal Theory Applied to the Growth of Injection Channels in a Liquid Resin Infusion Problem

Magalhães

Chiomento

Isoldi

et al. 2023

DDF

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The present numerical study proposes the application of the constructal theory for the build of empty channels inserted in a porous domain, representing the liquid resin infusion process. Two different strategies are employed: 1) I-shaped pre-defined configuration for the empty channel, 2) constructive technique (evolutionary) where the empty channel is built from an elemental configuration and using the performance indicator to define the new position of each empty channel element. It is investigated the influence of geometry over the impregnation time and the amount of wasted mass of resin during the process. The same fluid dynamic conditions and the maximum occupation area of the empty channel were defined for the different strategies. The finite volume method (FVM) and volume of fluid (VOF) were used for the solution of mass, momentum, and transport of resin equations, which model the flow of resin/air mixture. Darcy’s law is applied to represent the porous medium resistance. Results showed that the constructive technique was highly promising in the proposition of configurations that reduced the time of impregnation of resin in the porous medium. Moreover, it was observed that, for the present fluid dynamic conditions, giving more freedom for the formation of empty channels shape also led to a reduction of filling time of resin impregnation in the porous mold.

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Section: Numerical Procedures and Spatial Discretizationmentioning

confidence: 84%

Constructal Theory Applied to the Growth of Injection Channels in a Liquid Resin Infusion Problem

Magalhães

Chiomento

Isoldi

et al. 2023

DDF

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“…Também é necessária a solução para o transporte da fração de volume da resina, f, que é definida por: A fim de avaliar a metodologia numérica empregada aqui, o tempo para preenchimento do meio poroso com resina obtida para um caso simplificado e um fluxo retilíneo que foi alcançado analiticamente em trabalhos anteriores da literatura são comparados (ISOLDI et al, 2012;MAGALHÃES et al, 2016). O caso simplificado consiste em um escoamento de resina em um canal em analiticamente na literatura, em que a maior diferença é 0.66%.…”

Section: Modelagem Matemáticaunclassified

Estudo Numérico De Um Processo De Infusão De Resina Para Diferentes Configurações De Um Canal Vazio Em Forma De Y

Schnich¹,

Magalhães²,

Amico³

et al. 2017

MUNDI ETG

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Resumo: O presente trabalho avalia numericamente o processo de Infusão de ResinaLíquida (LRI-Liquid Resin Infusion) em distintas configurações de canais vazios com geometria "Y" inseridos numa placa retangular com meio poroso. O LRI consiste na injeção de uma resina polimérica em um molde fechado constituído por um meio poroso e canais vazios, que facilitam a propagação da resina por toda extensão do domínio. Destaca-se que esse processo apresenta grande aplicação na indústria automotiva, marítima e aeroespacial. O escoamento de resina é considerado incompressível, laminar e transiente tanto no meio poroso quanto no não-poroso. O objetivo é comparar o tempo de preenchimento da resina em diferentes configurações de canais vazios em formato de "Y" e identificar a geometria que minimiza o tempo de injeção. As restrições geométricas do problema são a área da placa com o meio poroso, a espessura e comprimento total do canal vazio. O problema possui dois graus de liberdade, a razão entre os comprimentos do ramo simples e dos ramos bifurcados do canal aberto (H 0 /H 1 ) e o ângulo entre os ramos bifurcados e a direção horizontal (α= 10º), que é mantido constante. As equações de conservação de massa e quantidade de movimento para a mistura resina-ar e, uma equação para o transporte de fração volumétrica de resina são resolvidas com o Método dos Volumes Finitos (FVM). A interação entre as fases é tratada com o método Volume of Fluid (VOF) e representa-se o efeito do meio poroso sobre o escoamento da resina pela força de campo dada pela lei de Darcy. Os resultados obtidos demonstraram que a variação de configuração tem alta influência no tempo de preenchimento da resina. Para o caso estudado, observou-se que a maior razão H 0 /H 1 conduziu ao melhor desempenho do sistema, ou seja, minimizou o tempo de injeção da resina.Palavras-chave: Infusão líquida de resina, Simulação numérica, Canais vazios, Geometria Y. Abstract:The present work numerically evaluates a Liquid Resin Infusion (LRI) process for different configurations of empty Y-shaped channels, inserted in a rectangular plate with porous medium. The LRI consists of the injection of a polymeric resin in a closed mold composed of

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Perfect Molding Challenges and The Limitations “A Case Study”

Tatt¹,

Huat²,

Tarmizi³

et al. 2018

Adv. sci. technol. eng. syst. j.

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Driven by today's market demand, semiconductor is pushing towards the zero-defect direction. The improvement demanded in semiconductor manufacturing is becoming increasingly challenging. In this paper, common molding defects comprise of voids, incomplete fills, and piping holes are studied systematically, focusing on three key areas: 1) Potential mold flow weakness; 2) Molding temperature stability; as well as 3) Defined pressure effects. The in-depth understanding of mold flow in the LF design is achieved via mold flow numerical tool. The numerical model prediction is verified by short shots and end-of-line auto vision data. Advance Process Control (APC) is adopted to measure the stability of key molding parameters like temperature, transfer profile and pressure. The mechanism of transferring the compound in relation to pressure is also analyzed and its effect to molding quality is also assessed. A methodical approach is utilized to understand the process and equipment built-in capabilities from two different equipment manufacturers. The real time transfer profile monitoring is activated for diagnosis of the system issue which leads to the finding of design error of a critical component. The dual temperature controller on one of the systems is analyzed to stabilize temperature for improved compound flow-viscosity control. The process limitations are assessed and transfer profiles are optimized to modify the melt front. By shifting the molding defects to non-critical location, the formation of void at the 500um diameter bonded wire loop peak will be avoided. The verification of potential negative impacts resulted from changes to improve voids, incomplete fills and piping holes are also included in this study. Up-front analysis by adopting numerical tool as a means of understanding the existing design and identifying improvement approach are proven to be useful.

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Geometrical evaluation of a resin infusion process by means of constructal design

Cited by 3 publications

References 19 publications

Constructal Theory Applied to the Growth of Injection Channels in a Liquid Resin Infusion Problem

Constructal Theory Applied to the Growth of Injection Channels in a Liquid Resin Infusion Problem

Estudo Numérico De Um Processo De Infusão De Resina Para Diferentes Configurações De Um Canal Vazio Em Forma De Y

Perfect Molding Challenges and The Limitations “A Case Study”

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