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Computational Modeling Of The Vacuum Assisted Resin Transfer Molding Vartm Process
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Book Synopsis Computational Modeling of the Vacuum Assisted Resin Transfer Molding (VARTM) Process by : Krishna Mohan Chittajallu
Download or read book Computational Modeling of the Vacuum Assisted Resin Transfer Molding (VARTM) Process written by Krishna Mohan Chittajallu and published by . This book was released on 2004 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Analytical Vacuum-Assisted Resin Transfer Molding (VARTM) Flow Model by :
Download or read book An Analytical Vacuum-Assisted Resin Transfer Molding (VARTM) Flow Model written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A closed form solution for the flow of resin in the vacuum-assisted resin transfer molding (VARTM) process is used extensively for affordable manufacturing of large composite structures. During VARTM processing, a highly permeable distribution medium is incorporated into the preform as a surface layer. During infusion, the resin flows preferentially across the surface, simultaneously through the preform, to a complex flow front. The analytical solution presented here provides insight into the scaling laws governing fill times and resin inlet placement as a function of the properties of the preform, distribution media, and resin. The formulation assumes that the flow is fully developed and is divided into two areas: (1) a saturated region with no cross flow, and (2) a flow front region, which moves with a uniform velocity, where the resin is infiltrating into the preform from the distribution medium. The law of conservation of mass and Darcy's Law for flow through porous media are applied in each region. The resulting equations are nondimensionalized and are solved to yield the flow front shape and the development of the saturated region. It is found that the flow front is parabolic in shape, and the length of the saturated region is proportional to the square root of the time elapsed. The obtained results are compared to data from fill-scale simulation and show good agreement. The solution allows greater insight into the physics process, enables parametric and optimization studies, and can reduce the computational cost of full-scale, three-dimensional (3-D) simulations.
Book Synopsis An Analytical Vacuum-Assisted Resin Transfer Molding (VARTM) Flow Model by : Bruce K. Fink
Download or read book An Analytical Vacuum-Assisted Resin Transfer Molding (VARTM) Flow Model written by Bruce K. Fink and published by . This book was released on 2000-10-01 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: A closed form solution for the flow of resin in the vacuum-assisted resin transfer molding (VARTM) process is used extensively for affordable manufacturing of large composite structures. During VARTM processing, a highly permeable distribution medium is incorporated into the preform as a surface layer. During infusion, the resin flows preferentially across the surface, simultaneously through the preform, to a complex flow front. The analytical solution presented here provides insight into the scaling laws governing fill times and resin inlet placement as a function of the properties of the preform, distribution media, and resin. The formulation assumes that the flow is fully developed and is divided into two areas: (1) a saturated region with no cross flow, and (2) a flow front region, which moves with a uniform velocity, where the resin is infiltrating into the preform from the distribution medium. The law of conservation of mass and Darcy's Law for flow through porous media are applied in each region. The resulting equations are nondimensionalized and are solved to yield the flow front shape and the development of the saturated region. It is found that the flow front is parabolic in shape, and the length of the saturated region is proportional to the square root of the time elapsed. The obtained results are compared to data from fill-scale simulation and show good agreement. The solution allows greater insight into the physics process, enables parametric and optimization studies, and can reduce the computational cost of full-scale, three-dimensional (3-D) simulations.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721944682 Total Pages :230 pages Book Rating :4.9/5 (446 download)
Book Synopsis Vartm Model Development and Verification by : National Aeronautics and Space Administration (NASA)
Download or read book Vartm Model Development and Verification written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this investigation, a comprehensive Vacuum Assisted Resin Transfer Molding (VARTM) process simulation model was developed and verified. The model incorporates resin flow through the preform, compaction and relaxation of the preform, and viscosity and cure kinetics of the resin. The computer model can be used to analyze the resin flow details, track the thickness change of the preform, predict the total infiltration time and final fiber volume fraction of the parts, and determine whether the resin could completely infiltrate and uniformly wet out the preform. Cano, Roberto J. (Technical Monitor) and Dowling, Norman E. Langley Research Center NCC1-01037
Book Synopsis Modeling the Vacuum Assisted Resin Transfer Molding (VARTM) Process for Fabrication of Fiber/metal Hybrid Laminates by : Goker Tuncol
Download or read book Modeling the Vacuum Assisted Resin Transfer Molding (VARTM) Process for Fabrication of Fiber/metal Hybrid Laminates written by Goker Tuncol and published by . This book was released on 2010 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulation on Filling Pattern of Vacuum Assisted Resin Transfer Molding (VARTM) for Sectional Wind Blade Shells by : Kee Hong Saw
Download or read book Simulation on Filling Pattern of Vacuum Assisted Resin Transfer Molding (VARTM) for Sectional Wind Blade Shells written by Kee Hong Saw and published by . This book was released on 2012 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Vacuum Assisted Resin Transfer Molding (VARTM) process is one of the most common and economical processes which has been adapted by many wind blade manufacturers. The significant advantages for this process primarily owed to its simplicity as well as its lower cost of operation. Nevertheless, there are several potential drawbacks from this process such as the delamination and the dryspot issues. The dryspot issue will be the main focus in this thesis. In this thesis, the methodology includes 3-D solid modeling, finite element modeling and injection simulations. Throughout the framework of this thesis, 3-D non-isothermal conditions would be implemented and double core framework will be incorporated within the sectional blade shells. The standard design of the blade is directly adapted from the Wind PACT Blade Designs. [1] The modeling work involves the use of CATIA V5 CAD modeling software to create a single full half wind blade shell which later sectioned to two sections. The sectional wind blade shells were equally divided right at the mid-span of the full blade namely, the root section and the tip section of the wind blade shells. Finite element modeling was also incorporated through the use of PATRAN 2008 r2 while the injection simulation is directly simulated through ESI Group of PAM RTM software. The results from the simulation were discussed and analyzed. Post analysis involves recommended solutions toward the issues found throughout the manufacturing process. Future works were also discussed in the final conclusions to provide potential future development study in the VARTM process.
Book Synopsis Process Modeling in Composites Manufacturing by : Suresh G. Advani
Download or read book Process Modeling in Composites Manufacturing written by Suresh G. Advani and published by CRC Press. This book was released on 2010-07-14 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a wealth of literature on modeling and simulation of polymer composite manufacturing processes. However, existing books neglect to provide a systematic explanation of how to formulate and apply science-based models in polymer composite manufacturing processes. Process Modeling in Composites Manufacturing, Second Edition provides tangible m
Book Synopsis Modeling and Simulation of Vacuum Assisted Resin Transfer Molding for the Fabrication of Composite Materials by : Emmanuel Kwaku Darko
Download or read book Modeling and Simulation of Vacuum Assisted Resin Transfer Molding for the Fabrication of Composite Materials written by Emmanuel Kwaku Darko and published by . This book was released on 2003 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies the application of the liquid injection molding simulations (LIMS) on the resin flow process in vacuum assisted resin transfer molding (VARTM) of flat panels under various operating and process conditions. Also examines LIMS performance in predicting the infiltration time and flow front pressure using experimental flat panel infiltration data. Analyzes flow front times, effect of grid size, permeability ratios of fibers, and viscosity of resin on resin arrival times.
Book Synopsis Modeling, Design and Control of Vacuum Assisted Resin Transfer Molding (VARTM) for Thickness Variation Reduction by : Jing Li
Download or read book Modeling, Design and Control of Vacuum Assisted Resin Transfer Molding (VARTM) for Thickness Variation Reduction written by Jing Li and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Manufacturing Techniques for Polymer Matrix Composites (PMCs) by : Suresh G Advani
Download or read book Manufacturing Techniques for Polymer Matrix Composites (PMCs) written by Suresh G Advani and published by Elsevier. This book was released on 2012-07-18 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer matrix composites are used extensively across a wide range of industries, making the design and development of effective manufacturing processes of great importance. Manufacturing techniques for polymer matrix composites (PMCs) provides an authoritative review of the different technologies employed in the manufacture of this class of composite. Following an introduction to composites and manufacturing processes, part one reviews the manufacturing of short fiber and nanoparticle based polymer matrix composites, with injection and compression molding examined in depth. Thermoplastic processing is the focus of part two. Sheet forming, fabric thermostamping, filament winding and continuous fiber reinforced profiles are investigated. Part three reviews thermoset processing. A survey of resin transfer molding follows, including vacuum-assisted and compression resin transfer molding. The pultrusion process is then considered, before the book concludes with an investigation into autoclave and out-of-autoclave curing processes in polymer matrix composites. With its distinguished editors and international team of expert contributors, Manufacturing techniques for polymer matrix composites (PMCs) is an essential guide for engineers and scientists working in the field of polymer matrix composites. Provides an authoritative review of the different technologies employed in the manufacture of polymer matrix composites Reviews the manufacturing of short fiber and nanoparticle-based polymer matrix composites, with injection and compression molding examined in depth Examines thermoplastic processing, sheet forming, fabric thermostamping, filament winding and continuous fiber reinforced profiles
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721093786 Total Pages :176 pages Book Rating :4.0/5 (937 download)
Book Synopsis RFI and Scrimp Model Development and Verification by : National Aeronautics and Space Administration (NASA)
Download or read book RFI and Scrimp Model Development and Verification written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-13 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vacuum-Assisted Resin Transfer Molding (VARTM) processes are becoming promising technologies in the manufacturing of primary composite structures in the aircraft industry as well as infrastructure. A great deal of work still needs to be done on efforts to reduce the costly trial-and-error methods of VARTM processing that are currently in practice today. A computer simulation model of the VARTM process would provide a cost-effective tool in the manufacturing of composites utilizing this technique. Therefore, the objective of this research was to modify an existing three-dimensional, Resin Film Infusion (RFI)/Resin Transfer Molding (RTM) model to include VARTM simulation capabilities and to verify this model with the fabrication of aircraft structural composites. An additional objective was to use the VARTM model as a process analysis tool, where this tool would enable the user to configure the best process for manufacturing quality composites. Experimental verification of the model was performed by processing several flat composite panels. The parameters verified included flow front patterns and infiltration times. The flow front patterns were determined to be qualitatively accurate, while the simulated infiltration times over predicted experimental times by 8 to 10%. Capillary and gravitational forces were incorporated into the existing RFI/RTM model in order to simulate VARTM processing physics more accurately. The theoretical capillary pressure showed the capability to reduce the simulated infiltration times by as great as 6%. The gravity, on the other hand, was found to be negligible for all cases. Finally, the VARTM model was used as a process analysis tool. This enabled the user to determine such important process constraints as the location and type of injection ports and the permeability and location of the high-permeable media. A process for a three-stiffener composite panel was proposed. This configuration evolved from the variation of the process constrain
Book Synopsis Effects of Processing Conditions on Vacuum Assisted Resin Transfer Molding Process (VARTM) by : Elias J. Rigas
Download or read book Effects of Processing Conditions on Vacuum Assisted Resin Transfer Molding Process (VARTM) written by Elias J. Rigas and published by . This book was released on 2001 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulation of the Vacuum Assisted Resin Transfer Molding Process by : Xiaolan Song
Download or read book Simulation of the Vacuum Assisted Resin Transfer Molding Process written by Xiaolan Song and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A process model that includes the coupled phenomenon of resin flow and preform compaction was developed and used to simulate resin infiltration of a fibrous preform using the vacuum-assisted resin transfer molding (VARTM) process. Flow of resin through the distribution medium and preform were modeled as flow through porous media. The finite element/control volume method was used to calculate the infiltrating fluid pressure distribution and track the progression of the flow front. The simulation results were compared with data obtained during infiltration of a carbon fiber preform with an epoxy resin. The parameters measured include the flow front location, resin pressure, and preform thickness change. With accurate inputs, the flow front locations and resin pressure distribution can be accurately predicted. The predicted transverse displacements do not agree well with the experimental measurements. The reasons for the differences are discussed, and further investigations are recommended to develop a more accurate compaction model.
Book Synopsis Computer Modeling of the Resin Transfer Molding Process by : Mischell Letson
Download or read book Computer Modeling of the Resin Transfer Molding Process written by Mischell Letson and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Health Monitoring For Advanced Composite Structures by : M H Ferri Aliabadi
Download or read book Structural Health Monitoring For Advanced Composite Structures written by M H Ferri Aliabadi and published by World Scientific. This book was released on 2017-12-18 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural health monitoring (SHM) is a relatively new and alternative way of non-destructive inspection (NDI). It is the process of implementing a damage detection and characterization strategy for composite structures. The basis of SHM is the application of permanent fixed sensors on a structure, combined with minimum manual intervention to monitor its structural integrity. These sensors detect changes to the material and/or geometric properties of a structural system, including changes to the boundary conditions and system connectivity, which adversely affect the system's performance.This book's primary focus is on the diagnostics element of SHM, namely damage detection in composite structures. The techniques covered include the use of Piezoelectric transducers for active and passive Ultrasonics guided waves and electromechanical impedance measurements, and fiber optic sensors for strain sensing. It also includes numerical modeling of wave propagation in composite structures. Contributed chapters written by leading researchers in the field describe each of these techniques, making it a key text for researchers and NDI practitioners as well as postgraduate students in a number of specialties including materials, aerospace, mechanical and computational engineering.
Book Synopsis Composite Materials by : Kamal K. Kar
Download or read book Composite Materials written by Kamal K. Kar and published by Springer. This book was released on 2016-10-14 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are used as substitutions of metals/traditional materials in aerospace, automotive, civil, mechanical and other industries. The present book collects the current knowledge and recent developments in the characterization and application of composite materials. To this purpose the volume describes the outstanding properties of this class of advanced material which recommend it for various industrial applications.
Book Synopsis Affordable NDM (Non-Distribution Media) Vacuum Assisted Resin Transfer Molding (VARTM) Processing for Large Naval Structures by :
Download or read book Affordable NDM (Non-Distribution Media) Vacuum Assisted Resin Transfer Molding (VARTM) Processing for Large Naval Structures written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sunrez Corporation has refined the LS-Process, an improved VARTM (Vacuum Assisted Resin Transfer Molding) process for the fabrication of large scale composite parts and ships. Sunrez has conceived and demonstrated the LS-Process which eliminates all of the under bag flow media usually associated with current VARTM processes. The currently used VARTM processes require an inordinate amount of "under the bag" resin distribution media and tubes and excess resin, which are thrown away after the part is fabricated creating higher material and labor costs. The LS-Process lowers costs with respect to labor and materials and has no under the bag resin distribution media. Sunrez has developed the LS VARTM Process to meets these requirements and is very low cost. In Phase I of this program, the LS VARTM Process was further developed and demonstration parts made which have shown the viability of this process to meet all of the Navy requirements for this program.
