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Verification Of A Three Dimensional Resin Transfer Molding Process Simulation Model
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723483813 Total Pages :178 pages Book Rating :4.4/5 (838 download)
Book Synopsis Verification of a Three-Dimensional Resin Transfer Molding Process Simulation Model by : National Aeronautics and Space Administration (NASA)
Download or read book Verification of a Three-Dimensional Resin Transfer Molding Process Simulation Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental evidence was obtained to complete the verification of the parameters needed for input to a three-dimensional finite element model simulating the resin flow and cure through an orthotropic fabric preform. The material characterizations completed include resin kinetics and viscosity models, as well as preform permeability and compaction models. The steady-state and advancing front permeability measurement methods are compared. The results indicate that both methods yield similar permeabilities for a plain weave, bi-axial fiberglass fabric. Also, a method to determine principal directions and permeabilities is discussed and results are shown for a multi-axial warp knit preform. The flow of resin through a blade-stiffened preform was modeled and experiments were completed to verify the results. The predicted inlet pressure was approximately 65% of the measured value. A parametric study was performed to explain differences in measured and predicted flow front advancement and inlet pressures. Furthermore, PR-500 epoxy resin/IM7 8HS carbon fabric flat panels were fabricated by the Resin Transfer Molding process. Tests were completed utilizing both perimeter injection and center-port injection as resin inlet boundary conditions. The mold was instrumented with FDEMS sensors, pressure transducers, and thermocouples to monitor the process conditions. Results include a comparison of predicted and measured inlet pressures and flow front position. For the perimeter injection case, the measured inlet pressure and flow front results compared well to the predicted results. The results of the center-port injection case showed that the predicted inlet pressure was approximately 50% of the measured inlet pressure. Also, measured flow front position data did not agree well with the predicted results. Possible reasons for error include fiber deformation at the resin inlet and a lag in FDEMS sensor wet-out due to low mold pressures. Fingerson, John C. and Loos, Alfred C. and ...
Book Synopsis Verification of a Three-dimensional Resin Transfer Molding Process Simulation Model by : John Conrad Fingerson
Download or read book Verification of a Three-dimensional Resin Transfer Molding Process Simulation Model written by John Conrad Fingerson and published by . This book was released on 1995 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-dimensional Resin Transfer Molding Process by : R. V. Mohan
Download or read book Three-dimensional Resin Transfer Molding Process written by R. V. Mohan and published by . This book was released on 1996 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721093656 Total Pages :168 pages Book Rating :4.0/5 (936 download)
Book Synopsis Resin Film Infusion (Rfi) Process Modeling for Large Transport Aircraft Wing Structures by : National Aeronautics and Space Administration (NASA)
Download or read book Resin Film Infusion (Rfi) Process Modeling for Large Transport Aircraft Wing Structures 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 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation completed the verification of a three-dimensional resin transfer molding/resin film infusion (RTM/RFI) process simulation model. The model incorporates resin flow through an anisotropic carbon fiber preform, cure kinetics of the resin, and heat transfer within the preform/tool assembly. The computer model can predict the flow front location, resin pressure distribution, and thermal profiles in the modeled part. The formulation for the flow model is given using the finite element/control volume (FE/CV) technique based on Darcy's Law of creeping flow through a porous media. The FE/CV technique is a numerically efficient method for finding the flow front location and the fluid pressure. The heat transfer model is based on the three-dimensional, transient heat conduction equation, including heat generation. Boundary conditions include specified temperature and convection. The code was designed with a modular approach so the flow and/or the thermal module may be turned on or off as desired. Both models are solved sequentially in a quasi-steady state fashion. A mesh refinement study was completed on a one-element thick model to determine the recommended size of elements that would result in a converged model for a typical RFI analysis. Guidelines are established for checking the convergence of a model, and the recommended element sizes are listed. Several experiments were conducted and computer simulations of the experiments were run to verify the simulation model. Isothermal, non-reacting flow in a T-stiffened section was simulated to verify the flow module. Predicted infiltration times were within 12-20% of measured times. The predicted pressures were approximately 50% of the measured pressures. A study was performed to attempt to explain the difference in pressures. Non-isothermal experiments with a reactive resin were modeled to verify the thermal module and the resin model. Two panels were manufactured using the RFI process. One was a stepped panel
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 Modeling of Three-dimensional Flow Fields in Injection and Resin Transfer Molding Processes by : Burkhard Friedrichs
Download or read book Modeling of Three-dimensional Flow Fields in Injection and Resin Transfer Molding Processes written by Burkhard Friedrichs and published by . This book was released on 1993 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Resin Transfer Moulding for Aerospace Structures by : T. Kruckenberg
Download or read book Resin Transfer Moulding for Aerospace Structures written by T. Kruckenberg and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resin Transfer Moulding and other similar 'liquid moulding' manufacturing methods have been used to make non-structural composites for the last 35 years. However, in the last eight years these methods have become the subject of enormous interest by aerospace manufacturing companies. Resin Transfer Moulding for Aerospace Structures describes all aspects of Resin Transfer Moulding (RTM) for aerospace structures. Written by an international team of experts, from both industry and academia, it is a comprehensive work providing complete and detailed information on the process of RTM from theoretical modelling to practical experience. With subjects including manufacturing, tooling, fabric design and flow modelling all covered, this book is an invaluable up-to-the-minute reference source which provides the reader with a good understanding of RTM and its possible uses, especially for high performance applications. Resin Transfer Moulding for Aerospace Structures is an ideal guide for those in the aerospace and related industries, who want to understand and utilize RTM, as well as those directly involved in the RTM industry.
Book Synopsis Finite Element Analysis by : Farzad Ebrahimi
Download or read book Finite Element Analysis written by Farzad Ebrahimi and published by BoD – Books on Demand. This book was released on 2012-10-10 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past few decades, the Finite Element Analysis (FEA) has been developed into a key indispensable technology in the modeling and simulation of various engineering systems. The present book is a result of contributions of experts from international scientific community and collects original and innovative research studies on recent applications of FEA in five major topics of mechanical engineering namely, fluid mechanics and heat transfer, machine elements analysis and design, machining and product design, wave propagation and failure-analysis and structural mechanics and composite materials. It is meant to provide a small but valuable sample of contemporary research activities around the world in this field and it is expected to be useful to a large number of researchers. The introductions, data, and references in this book will help the readers know more about this topic and help them explore this exciting and fast-evolving field.
Book Synopsis Verification of a Two-dimensional Infiltration Model for the Resin Transfer Molding Process by : Vincent H. Hammond
Download or read book Verification of a Two-dimensional Infiltration Model for the Resin Transfer Molding Process written by Vincent H. Hammond and published by . This book was released on 1993 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724707291 Total Pages :204 pages Book Rating :4.7/5 (72 download)
Book Synopsis Verification of a Two-Dimensional Infiltration Model for the Resin Transfer Molding Process by : National Aeronautics and Space Administration (NASA)
Download or read book Verification of a Two-Dimensional Infiltration Model for the Resin Transfer Molding Process written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-04 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: A two-dimensional finite element model for the infiltration of a dry textile preform by an injected resin was verified. The model, which is based on the finite element/control volume technique, determines the total infiltration time and the pressure increase at the mold inlet associated with the RTM process. Important input data for the model are the compaction and permeability behavior of the preform along with the kinetic and rheological behavior of the resin. The compaction behavior for several textile preforms was determined by experimental methods. A power law regression model was used to relate fiber volume fraction to the applied compaction pressure. Results showed a large increase in fiber volume fraction with the initial application of pressure. However, as the maximum fiber volume fraction was approached, the amount of compaction pressure required to decrease the porosity of the preform rapidly increased. Similarly, a power law regression model was used to relate permeability to the fiber volume fraction of the preform. Two methods were used to measure the permeability of the textile preform. The first, known as the steady state method, measures the permeability of a saturated preform under constant flow rate conditions. The second, denoted the advancing front method, determines the permeability of a dry preform to an infiltrating fluid. Water, corn oil, and an epoxy resin, Epon 815, were used to determine the effect of fluid type and viscosity on the steady state permeability behavior of the preform. Permeability values measured with the different fluids showed that fluid viscosity had no influence on the permeability behavior of 162 E-glass and TTI IM7/8HS preforms. Permeabilities measured from steady state and advancing front experiments for the warp direction of 162 E-glass fabric were similar. This behavior was noticed for tests conducted with corn oil and Epon 815. Comparable behavior was observed for the warp direction of the TTI IM7/8HS preform and...
Book Synopsis Aerospace Materials Handbook by : Sam Zhang
Download or read book Aerospace Materials Handbook written by Sam Zhang and published by CRC Press. This book was released on 2016-04-19 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whether an airplane or a space shuttle, a flying machine requires advanced materials to provide a strong, lightweight body and a powerful engine that functions at high temperature. The Aerospace Materials Handbook examines these materials, covering traditional superalloys as well as more recently developed light alloys. Capturing state-of-the-art d
Book Synopsis Thermo-Mechanics Applications and Engineering Technology by : Zied Driss
Download or read book Thermo-Mechanics Applications and Engineering Technology written by Zied Driss and published by Springer. This book was released on 2018-01-30 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the dissemination of information of permanent interest in thermo-mechanics applications and engineering technology. Contributions have clear relevance to industrial device and a relatively straightforward or feasible path to application. Chapters are sought that have long-term relevance to specific applications including convective heat transfer, fluid mechanics, combustion, aerodynamics, hydrodynamics, turbomachinery and multi-phase flows. In fact, many aspects in industrial operations and daily life are closely related to thermo-mechanics processes. Along with the development of computer industry and the advancement of numerical methods, solid foundation in both hardware and software has been established to study the processes by using numerical simulation methods, which play important roles in the ways of extending research topics, reducing research costs, discovering new phenomena, and developing new technologies. The presented case studies and development approaches aim to provide the readers, such as engineers and PhD students, with basic and applied studies broadly related to the Thermo-Mechanics Applications and Engineering Technology.
Book Synopsis Simulation and Validation of Mold Filling During Compression Resin Transfer Molding (CRTM) Process by : Prabhas M. Bhat
Download or read book Simulation and Validation of Mold Filling During Compression Resin Transfer Molding (CRTM) Process written by Prabhas M. Bhat and published by ProQuest. This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In Compression Resin Transfer Molding (CRTM), the fiber preform is placed in the mold; the top of the mold is lowered until there is a small gap between the preform and the mold. The measured amount of resin is injected through one or more gates into this highly permeable gap. Then the resin injection is switched off and the mold is closed by moving the mold platen towards the preform until it reaches the desired thickness. This action compresses the preform and pressurizes the resin to flow into the preform and occupy the empty regions between the fibers. This process is very attractive for high volume production of net shape composite structures and is being considered by automobile manufacturing industry for structural components. The challenge is to create void free structures with reasonable applied force with filling times of the order of a few minutes. A model and simulation of the process can help identify the important parameters in the process that will aid in achieving this goal. An existing numerical simulation that can model the RTM process has been modified to accommodate the presence of gap elements, compression of preform and reduction of mesh size during the process. The process is modeled in three stages: (i) resin injection into the gap, (ii) closing of the gap with negligible compression of the preform and (iii) preform compaction. An analysis of the process has been conducted to identify the important non-dimensional parameters that influence the process. A parametric study reveals the relationship between the material, process and the geometric variables in this process. To validate the numerical model, an experimental set-up was constructed. The set-up includes a semi cylindrical transparent mold which is compressed using pressurized water in a collapsible tube. Independent experiments are conducted to measure the permeability of the fabric and the force required for compression. Various process parameters such as the location of the resin front during the compression, the rate of compression and the force are recorded as a function of time. These results are compared with the simulation to gauge the accuracy of the model and the reliability in the characterization of the material parameters. This simulation should prove useful in development of process inputs for large scale structures to produce void free parts with optimal compression rates and pressures.
Book Synopsis Advances in Composites Manufacturing and Process Design by : Philippe Boisse
Download or read book Advances in Composites Manufacturing and Process Design written by Philippe Boisse and published by Woodhead Publishing. This book was released on 2015-07-29 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: The manufacturing processes of composite materials are numerous and often complex. Continuous research into the subject area has made it hugely relevant with new advances enriching our understanding and helping us overcome design and manufacturing challenges. Advances in Composites Manufacturing and Process Design provides comprehensive coverage of all processing techniques in the field with a strong emphasis on recent advances, modeling and simulation of the design process. Part One reviews the advances in composite manufacturing processes and includes detailed coverage of braiding, knitting, weaving, fibre placement, draping, machining and drilling, and 3D composite processes. There are also highly informative chapters on thermoplastic and ceramic composite manufacturing processes, and repairing composites. The mechanical behaviour of reinforcements and the numerical simulation of composite manufacturing processes are examined in Part Two. Chapters examine the properties and behaviour of textile reinforcements and resins. The final chapters of the book investigate finite element analysis of composite forming, numerical simulation of flow processes, pultrusion processes and modeling of chemical vapour infiltration processes. - Outlines the advances in the different methods of composite manufacturing processes - Provides extensive information on the thermo-mechanical behavior of reinforcements and composite prepregs - Reviews numerical simulations of forming and flow processes, as well as pultrusion processes and modeling chemical vapor infiltration
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composite Materials in Design Processes by : Giangiacomo Minak
Download or read book Composite Materials in Design Processes written by Giangiacomo Minak and published by MDPI. This book was released on 2021-09-02 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of composite materials in the design process allows one to tailer a component’s mechanical properties, thus reducing its overall weight. On the one hand, the possible combinations of matrices, reinforcements, and technologies provides more options to the designer. On the other hand, it increases the fields that need to be investigated in order to obtain all the information requested for a safe design. This Applied Sciences Special Issue, “Composite Materials in Design Processes”, collects recent advances in the design methods for components made of composites and composite material properties at a laminate level or using a multi-scale approach.
Book Synopsis Design Manufacturing Composites, Third International Canada-Japan Workshop by : Suong V. Hoa
Download or read book Design Manufacturing Composites, Third International Canada-Japan Workshop written by Suong V. Hoa and published by CRC Press. This book was released on 2000-10-20 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains technical papers, presented at the third joint Canada-Japan workshop on Composites held in Japan in 2000, on topics, including smart composites, composites in civil construction, toughened composites, textile composites, braided composites, and thermoplastic composites.
