Relevant bibliographies by topics / Center-Gated Disk

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Center-Gated Disk'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Center-Gated Disk"

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Altan, M. Cengiz, and Bharath N. Rao. "Closed‐form solution for the orientation field in a center‐gated disk." Journal of Rheology 39, no. 3 (May 1995): 581–99. http://dx.doi.org/10.1122/1.550714.

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Mazahir, S. M., G. M. Vélez-García, P. Wapperom, and D. Baird. "Fiber orientation in the frontal region of a center-gated disk: Experiments and simulation." Journal of Non-Newtonian Fluid Mechanics 216 (February 2015): 31–44. http://dx.doi.org/10.1016/j.jnnfm.2014.12.008.

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Park, Jang Min, and Tai Hun Kwon. "Nonisothermal transient filling simulation of fiber suspended viscoelastic liquid in a center-gated disk." Polymer Composites 32, no. 3 (December 29, 2010): 427–37. http://dx.doi.org/10.1002/pc.21061.

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Vélez-García, Gregorio M., Peter Wapperom, Donald G. Baird, Alex O. Aning, and Vlastimil Kunc. "Unambiguous orientation in short fiber composites over small sampling area in a center-gated disk." Composites Part A: Applied Science and Manufacturing 43, no. 1 (January 2012): 104–13. http://dx.doi.org/10.1016/j.compositesa.2011.09.024.

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Mazahir, S. M., G. M. Vélez-García, P. Wapperom, and D. Baird. "Evolution of fibre orientation in radial direction in a center-gated disk: Experiments and simulation." Composites Part A: Applied Science and Manufacturing 51 (August 2013): 108–17. http://dx.doi.org/10.1016/j.compositesa.2013.04.008.

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Kim, I. H., S. J. Park, S. T. Chung, and T. H. Kwon. "Numerical modeling of injection/compression molding for center-gated disk: Part II. Effect of compression stage." Polymer Engineering & Science 39, no. 10 (October 1999): 1943–51. http://dx.doi.org/10.1002/pen.11587.

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Kim, I. H., S. J. Park, S. T. Chung, and T. H. Kwon. "Numerical modeling of injection/compression molding for center-gated disk: Part I. Injection molding with viscoelastic compressible fluid model." Polymer Engineering & Science 39, no. 10 (October 1999): 1930–42. http://dx.doi.org/10.1002/pen.11586.

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Li, Tianyi, and Jean-François Luyé. "Optimization of Fiber Orientation Model Parameters in the Presence of Flow-Fiber Coupling." Journal of Composites Science 2, no. 4 (December 18, 2018): 73. http://dx.doi.org/10.3390/jcs2040073.

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In this paper, we propose a novel systematic procedure to minimize the discrepancy between the numerically predicted and the experimentally measured fiber orientation results on an injection-molded part. Fiber orientation model parameters are optimized simultaneously using Latin hypercube sampling and kriging-based adaptive surrogate modeling techniques. Via an adequate discrepancy measure, the optimized solution possesses correct skin–shell–core structure and global orientation evolution throughout the considered center-gated disk. Some non-trivial interaction between these parameters and flow-fiber coupling effects as well as their quantitative importance are illustrated. The parametric fine-tuning of orientation models mostly leads to a better agreement in the skin and shell regions, while the coupling effect via a fiber-dependent viscosity improves prediction in the core.
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Lee, Young Bok, Tai Hun Kwon, and Kyunghwan Yoon. "Numerical prediction of residual stresses and birefringence in injection/compression molded center-gated disk. Part II: Effects of processing conditions." Polymer Engineering & Science 42, no. 11 (November 2002): 2273–92. http://dx.doi.org/10.1002/pen.11115.

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Wapperom, Peter, and Donald G. Baird. "The use of flow type dependent strain reduction factor to improve fiber orientation predictions for an injection molded center-gated disk." Physics of Fluids 31, no. 12 (December 1, 2019): 123105. http://dx.doi.org/10.1063/1.5129679.

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Dissertations / Theses on the topic "Center-Gated Disk"

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Mazahir, Syed Makhmoor. "Improvement in Orientation Predictions of High-Aspect Ratio Particles in Injection Mold Filling Simulations." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/50654.

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Glass fiber based polymer composites based injection molded parts provide a light-weight high-strength alternative for use in automobile applications. These composites have enhanced mechanical properties compared to those of pure polymers, if the fibers are oriented in the right direction. One of the major challenges in processing of these composites is to control the fiber orientation in the final product.
The evolution of short glass fiber orientation in a center-gated disk was experimentally determined along the radial direction at three different heights representative of the shell, transition and core layers, respectively. Orientation data along the shell and transition layers in the lubrication region show shear flow effects, which tends to align the fibers along the flow direction. In the core layer, where the extension in the "-direction dominates, fibers tend to get aligned along the "-direction. In the frontal flow region orientation in the flow direction drops in all three layers due to fountain flow effects.
Fiber orientation predictions in coupled and decoupled transient simulations using the Folgar-Tucker model, and the two slow versions of the Folgar-Tucker model, namely the slip Folgar-Tucker model and the reduced strain closure (RSC) model were compared with the experimental data. Measured inlet orientation was used in all simulations and model parameters were determined by fitting model predictions to rheological data under startup of shear. Pseudo-concentration method was implemented for the modeling of the advancing front and fountain flow effects in the region near the front. Discontinuous Galerkin finite element method and a third order Runge-Kutta total variance diminishing time integration scheme were implemented for the solution of the orientation and transport equations. In the lubrication region of the shell layer, all three orientation models provided a good match with the experimental data. In the frontal region, fountain flow simulations showed characteristic features seen in r- and z-profiles of orientation, although the experimental data showed these features at a relatively larger distance behind the front while the simulations predicted these effects only upto a small distance behind the front. On the other hand, orientation predictions with the Hele-Shaw flow approximation showed significant over-predictions in the frontal region. With model parameters determined from fitting to rheological data, coupling did not show any significant improvements. However, with the use of a smaller value of the fiber interaction parameter, coupling showed significant improvement in orientation predictions in all three layers in the frontal region.
The simulation scheme was extended to long fiber systems by comparing available long fiber orientation data in a center-gated disk with model predictions using the Bead-Rod model which considers fiber bending, a property exhibited by long semi-flexible fibers. The Bead-Rod model showed improvements over rigid fiber models in the lubrication region of the shell layer. However, close to the front, both models showed similar predictions. In fountain flow simulations, the flow features seen in the r- and z-profiles were much better predicted with both the models while Hele-Shaw flow approximation showed over-prediction of orientation in the flow direction, especially in the shell layer.
Ph. D.
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Conference papers on the topic "Center-Gated Disk"

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You, Byoung Hee, Daniel S. Park, Christopher W. Mock, Wilfredo M. Caceres, Dimitris E. Nikitopoulos, Steven A. Soper, and Michael C. Murphy. "Tolerance Variation and Passive Alignment in Modular, Polymer Microfluidic Devices." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15258.

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Simulations and experiments to assess the predictability of dimensional and locational tolerances of passive alignment structures on injection molded microfluidic components were performed. A center-gated disk with microscale assembly features, to aid metrology, was reproduced using injection molding. The feature dimensions were 100, 200, 300, and 400 μ. Dimensions of the features were measured using optical profilometery and optical microscopy. Simulations using a commercial package overestimated replication fidelity. Mold surface temperatures and injection speeds significantly affected the replication fidelity as the ratio of surface area to volume increased. The location of better replication fidelity, at each mold surface temperature, moved from the edge of the mold cavity to the injection point as the mold surface temperature increased from 100°C to 150°C. Therefore, process parameters and the design of a mold have to be considered for successful replication of the features.
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Hamidi, Youssef K., Sudha Dharmavaram, Levent Aktas, and M. Cengiz Altan. "Effect of Fiber Content on Void Morphology in Resin Transfer Molded E-Glass/Epoxy Composites." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80387.

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Effect of fiber volume fraction on occurrence, morphology, and spatial distribution of microvoids in resin transfer molded E-glass/epoxy composites is investigated. Three disk-shaped center-gated composite parts containing 8, 12, and 16 layers of randomly-oriented, E-glass fiber perform are molded, yielding 13.5, 20.5 and 27.5% fiber volume fractions, respectively. Voids throughout these disk-shaped composites are evaluated by microscopic image analysis of samples obtained along the radius. Each identified void’s equivalent radius, area, and shape are determined at 200x magnification. Number of voids is found to decrease moderately with increasing fiber content. Void areal density decreased from 10.5 to 9.5 voids/mm2 as fiber content is increased from 13.5 to 27.5% fiber content. Similarly, void volume fraction decreased from 3.1 to 2.5%. Average void size is observed to remain similar at 53 to 55 μm when the fiber content is increased from 13.5 to 27.5%. Increasing fiber volume fraction from 13.5 to 27.5% lowers the contribution of irregularly-shaped voids from 40% of total voids down to 22.4%. Along the radial direction, combined effects of void formation by mechanical entrapment and void mobility are shown to yield a spatially complex void distribution. However, increasing fiber content is observed to affect the void formation mechanisms as more voids are able to move towards the exit vents during molding. These findings are believed to be applicable not only to resin transfer molding, but generally to liquid composite molding processes.
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Hamidi, Youssef, Levent Aktas, J. David Bladwin, and M. Cengiz Altan. "Static and Fatigue Strength of Resin Transfer Molded Composites." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39695.

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Fiber reinforced polymer composites are preferred in many structural applications for their ease of production and high specific strengths. Although fatigue loading is commonly encountered in structural applications, behavior of composites under cyclic loading is less understood compared to fatigue behavior of more conventional metals and their alloys. In this work, the response of resin transfer molded (RTM) glass/epoxy composites to static tensile and fatigue loading is investigated. Center-gated, disk shaped composites are fabricated using EPON 815C epoxy resin and EPICURE 3282 curing agent. A randomly oriented, planar glass fiber preform with 0.459kg/m2 surface density is used as the reinforcement material. Two and six layers of preforms are used to achieve 7.9 and 28.9% fiber volume fractions respectively. In addition, neat polymer parts are molded without performs to study the effect of fiber content on the tensile and fatigue behavior. Initially, ultimate tensile strength (UTS) and stiffness for three different fiber volume fractions (i.e., 0, 7.9, and 28.9%) are reported. Then, fatigue tests are conducted for stress level (σmax/UTS) of 0.5 and stress ratio (σmax/σmin) of 0.1 at a test frequency of 10 Hz. Loss of stiffness and cycles to failure are the two fatigue properties investigated. As the fiber volume fraction increased from 7.9 to 28.9%, the ultimate tensile strength and stiffness increased by 140 and 100%, respectively. During fatigue loading, the stiffness gradually dropped by approximately 13% for 7.9% and 28.9% fiber volume fractions. However, neat polymer samples did not show considerable decrease in stiffness during cycling. It is also shown that the number of cycles before failure significantly increased with the fiber content.
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Li, C., and F. Lai. "Effects of gravitation and surface tension on flow injection in center-gated disks." In 40th AIAA Aerospace Sciences Meeting & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-760.

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Chen, Hongyu, Peter Wapperom, and Donald G. Baird. "Simulation of Long Semi-Flexible Fiber Orientation During Injection Molding." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8577.

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Fiber orientation simulation is conducted for the Center-Gated-Disk (CGD) geometry and compared with experimental data. Long-fiber thermoplastic composites (LFTs) possess competitive advantages over short glass fiber composites in terms of their mechanical properties while retain the ability to be injection molded. Mechanical properties of LFTs are highly dependent on the microstructural variables imparted by the injection molding process including fiber orientation and fiber length distribution. As the fiber length increased, the mechanical properties of the composites containing discontinuous fibers can approach those of continuous fiber materials. Several researchers have reported that flexural, creep and charpy impact properties increase as fiber length increases, while tensile modulus will plateau for glass fibers above 1 mm in length. Fibers less than the 1 mm threshold have been considered to be short while fibers with lengths greater than 1 mm are considered long. For long fibers, they will have the ability to deform, bend and even break during any stage of polymer processing. There is a lack of knowledge about the effects of fiber length and fiber length variation on fiber orientation kinetics. This lack of information provides an opportunity to understand the length effect inherent to long fibers systems. The Bead-Rod fiber orientation model takes into account the flexibility of semi-flexible fibers that show small bending angles. In this model, a flexibility parameter representing the resistive bending potential is fiber length dependent (detailed explanation can be found in the reference)1. This work is concerned with the effect of fiber length on the performance of the Bead-Rod fiber orientation model which takes into account the flexibility of semi-flexible fibers. Different averaging techniques are used to represent the average fiber length for the population of fibers, which give different fiber length parameters for the Bead-Rod model. The sensitivity of the Bead-Rod model is evaluated with regard to the fiber flexibility parameter, k, and length parameter, lb. The other phenomenal parameters within the orientation model are obtained via basic rheological measurements using simple shear flow. As the value of average fiber length Lav increases and the corresponding flexibility parameter value decreases, the core regions become wider and the flow direction orientation gradually decreases especially near the walls for the Bead-Rod model predictions. In addition, as the parameters favor longer fiber lengths, the predicted extent of fiber bending increases. The simulation results are also compared with the experimental obtained fiber orientation at different flow length along the thickness direction. The Bead-Rod model shows improvement over the rigid rod model.
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