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Relevant bibliographies by topics / Vacuum Assisted Resin transfer Molding

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Academic literature on the topic 'Vacuum Assisted Resin transfer Molding'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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Journal articles on the topic "Vacuum Assisted Resin transfer Molding"

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Hancioglu, Mert, E. Murat Sozer, and Suresh G. Advani. "Comparison of in-plane resin transfer molding and vacuum-assisted resin transfer molding ‘effective’ permeabilities based on mold filling experiments and simulations." Journal of Reinforced Plastics and Composites 39, no. 1-2 (August 8, 2019): 31–44. http://dx.doi.org/10.1177/0731684419868015.

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Resin transfer molding and vacuum-assisted resin transfer molding are two of the most commonly used liquid composite molding processes. For resin transfer molding, mold filling simulations can predict the resin flow patterns and location of voids and dry spots which has proven useful in designing the mold and injection locations for composite parts. To simulate vacuum-assisted resin transfer molding, even though coupled models are successful in predicting flow patterns and thickness distribution, the input requires fabric compaction characterization in addition to permeability characterization. Moreover, due to the coupled nature of flow and fabric compaction, the simulation is computationally expensive precluding the possibility to optimize the flow design for reliable production. In this work, we present an alternative approach to characterize and use an “effective” permeability in the resin transfer molding solver to simulate resin flow in vacuum-assisted resin transfer molding. This decoupled method is very efficient and provides reasonable results. The deviations in mold filling times between experiments and simulations for the resin transfer molding process with E-glass CSM and carbon 5HS were 4.7% and 1.0%, respectively, while for the vacuum-assisted resin transfer molding case using “effective permeability value” with E-glass CSM and carbon 5HS fabrics were 11.1% and 12.3%, respectively, which validates the approach presented.

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Parnas, Richard S., and Shawn M. Walsh. "Vacuum-assisted resin transfer molding model." Polymer Composites 26, no. 4 (2005): 477–85. http://dx.doi.org/10.1002/pc.20121.

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Chang, Chih-Yuan. "Modeling and evaluation of the filling process of vacuum-assisted compression resin transfer molding." Journal of Polymer Engineering 33, no. 3 (May 1, 2013): 211–19. http://dx.doi.org/10.1515/polyeng-2012-0160.

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Abstract In the present study, a modified vacuum-assisted compression resin transfer molding (VACRTM) process has been developed to reduce the cycling period. The process uses an elastic bag placed between the upper mold and the preform to replace the mobile rigid mold in compression resin transfer molding. During resin injection, the bag is pulled upward by the vacuum applied in between the upper mold and the bag, and a loose fiber stack is then present. Resin is easily injected into the mold. Once enough volume of resin is injected, the compression pressure is applied on the bag, which compacts the preform and drives the resin through the remaining dry preform. Numerical results show that the bag compression phase is much longer than the resin injection one. A multistage compression strategy can be used to control the compression time. Due to inherent process defects, a higher volume of the injected liquid is essential and thus leads to a longer injection and compression phase in order to inject and squeeze the excess resin. The late compression is very slow in draining the residual resin. As compared with resin transfer molding, VACRTM can reduce the mold-filling time/injection pressure.

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TAGA, Kenji. "1323 Resin Flow Simulation under Vacuum assisted Resin Transfer Molding." Proceedings of Conference of Kansai Branch 2007.82 (2007): _13–23_. http://dx.doi.org/10.1299/jsmekansai.2007.82._13-23_.

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Song, Young Seok, and Jae Ryoun Youn. "Modeling of resin infusion in vacuum assisted resin transfer molding." Polymer Composites 29, no. 4 (2008): 390–95. http://dx.doi.org/10.1002/pc.20326.

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Chang, Chih-Yuan. "Numerical study of filling strategies in vacuum assisted resin transfer molding process." Journal of Polymer Engineering 35, no. 5 (June 1, 2015): 493–501. http://dx.doi.org/10.1515/polyeng-2014-0237.

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Abstract During the filling process of vacuum assisted resin transfer molding (VARTM), the infusion pressure gradient causes the resin flow and preform thickness variation. Even after the resin infusion discontinues, the resin keeps on flowing until the unnecessary resin is removed. In this study, a one-dimensional flow model coupled to the preform deformation is numerically analyzed to assess the influences of various processing scenarios on the infusion and post-infusion stages. The numerical model is implemented using a finite difference method. Results show that two strategies effectively reduce the filling process. One is to infuse less excess resin and the other is to turn the inlet into the additional vent. For a typical process using a one-sided vent, the theoretically optimum scenario is to infuse the exact required resin volume into the preform. From a practical standpoint, excess resin infusion is inevitable and a robust scenario is proposed by integrating the concept of fully filled preform and two strategies. Additional cases are performed using a vacuum assisted compression RTM (VACRTM) process for comparison purposes. Through the numerical work, a tool for optimization of the VARTM process is provided to reduce the filling process, resin waste and variability in the final composite part.

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Sales, Rita de Cássia Mendonça, Silas Rodrigo Gusmão, Ricardo Francisco Gouvêa, Thomas Chu, José Maria Fernandez Marlet, Geraldo Maurício Cândido, and Maurício Vicente Donadon. "The temperature effects on the fracture toughness of carbon fiber/RTM-6 laminates processed by VARTM." Journal of Composite Materials 51, no. 12 (November 25, 2016): 1729–41. http://dx.doi.org/10.1177/0021998316679499.

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The increasing use of composite in the aircraft industry has raised the interest for a better understanding of the failure process in these materials, which can be also influenced by the manufacturing process of the laminate. Some materials used in vacuum assisted resin transfer molding process have been studied in the open literature but very few data have been published for resin transfer molding-6 epoxy based laminates, in particular studies showing the influence of the temperature on the interlaminar fracture behavior of this type of laminates. The aim of this article is to investigate the interlaminar fracture behavior of resin transfer molding-6 based carbon composite laminates manufactured by vacuum assisted resin transfer molding subjected to Modes I and II at 25℃ and 80℃. The results show the influence of the temperature on the interlaminar fracture toughness of composites and provide a database to design composite aerostructures subjected to temperatures commonly experienced in civil aviation. The fracture aspects of the tested laminates were also investigated and directly related to the trend in results found for the fracture toughness values.

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Chang, Chih-Yuan, and Hung-Jie Lin. "Unsaturated polyester/E-glass fiber composites made by vacuum assisted compression resin transfer molding." Journal of Polymer Engineering 32, no. 8-9 (December 1, 2012): 539–46. http://dx.doi.org/10.1515/polyeng-2012-0071.

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Abstract A variant process incorporating the method of bag compression into resin transfer molding (RTM), called vacuum assisted compression RTM (VACRTM), has been developed to reduce the cycling period and improve the quality of the part. The process utilizes a flexible bag placed between the upper mold and the preform compared with RTM. By controlling the stretchable bag, the resin is easily introduced into the cavity filled with a loose preform. Then, ambient pressure is applied on the bag that compacts the preform and drives the resin through the remaining dry preform. The objective of this research is to explore the simplified VACRTM feasibility and investigate the effects of process variables, including resin temperature, resin infusion pressure, mold cavity height and cure temperature, on the mechanical strength of the part, by applying Taguchi’s method. The results show that VACRTM has advantages in terms of its being an easy and good seal among mold parts and the the lack of a need to clean the upper mold. The resin infusion pressure is a significant variable for improvement of the mechanical strength of the part. Optimal VACRTM reduces the filling time by 58% and increases the flexural strength by 10%, as compared with typical vacuum assisted RTM (VARTM).

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Hidayatul, Rika Dwi, Ahmad Syuhri, Aris Zainul Mutaqqin, and Lazuardi Rahmadhani. "PENGARUH POSISI VACUUM GATE TERHADAP MATERIAL TERBUANG PADA PROSES VACUUM ASSISTED TRANSFER MOLDING." Jurnal Elemen 4, no. 2 (December 29, 2017): 82. http://dx.doi.org/10.34128/je.v4i2.53.

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Vacuum Assisted Resin Transfer Molding merupakan salah satu metode pembuatan produk dimana resin sebagai matriks dihisap dengan tekanan vacuum didalam cetakan dengan bagging trasparan. Produk dari hasil Vacuum Assisted Resin Transfer Molding lebih tipis, permukan rata, ketebalan sama dan padat dibandingkan dengan metode Hand Lay Up namun membutuhkan proses Infuse lebih lama. Tujuan dari penelitian dalam karya ilmiah ini adalah untuk mengamati pengaruh dari posisi Vacuum Gate terhadap banyaknya material terbuang dalam proses Infuse suatu produk. Variasi posisi Vacuum Gate diletakan dalam tiga posisi berbeda 60%, 80% dan 100% dari total panjang cetakan serta tekanan Vacuum sebesar -0.6 Bar, -0.8 Bar dan -1.0 Bar menghasilkan material terbuang yang terkumpul dalam Trap Pot seberat 11.3 Gram pada posisi Vacuum gate berada pada 80% dari panjang total cetakan dan tekanan Vacuum sebesar -0.8 Bar. Hasil penelitian menunjukan bahwa posisi Vacuum Gate terbaik untuk meminimaslisir material terbuang adalah pada posisi 80% dari total panjang cetakan, disebabkan karena pada posisi tersebut terbukti mengurangi terjadinya perbedaan aliran resin yang mengalami Infuse, serta dengan tekanan -0.8 Bar adalah tekanan optimal dalam penelitian ini, hal ini dikarenakan apabila dengan tekanan yang terlalu besar menyebabkan aliran resin tidak merata melainkan langsung menuju Vacuum Gate, bila dengan tekanan terlalu kecil berakibat pada waktu Infuse yang lebih lama sehingga terjadi Curing terlebih dahulu sebelum proses Infuse selesai. Dengan memvariasikan tekanan vacuum serta posisi Vacuum Gate menunjukan rekayasa berhasil dilakukan untuk meminimalisir material terbuang dalam pembuatan suatu produk.

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Shih, Chih-Hsin, Qingfang Liu, and L. James Lee. "Vacuum-assisted resin transfer molding using tackified fiber preforms." Polymer Composites 22, no. 6 (December 2001): 721–29. http://dx.doi.org/10.1002/pc.10574.

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Dissertations / Theses on the topic "Vacuum Assisted Resin transfer Molding"

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Sun, Xiudong. "Analysis of vacuum-assisted resin transfer molding /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487950658548618.

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Al, Omari Ali. "Effect of vacuum level on the vacuum-assisted resin transfer molding process." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ43656.pdf.

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Song, Xiaolan. "Vacuum Assisted Resin Transfer Molding (VARTM): Model Development and Verification." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/27168.

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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. Flow of resin through the preform is modeled as flow through porous media. Darcy's law combined with the continuity equation for an incompressible Newtonian fluid forms the basis of the flow model. During the infiltration process, it is well accepted that the total pressure is shared by the resin pressure and the pressure supported by the fiber network. With the progression of the resin, the net pressure applied to the preform decreases as a result of increasing local resin pressure. This leads to the springback of the preform, and is called the springback mechanism. On the other side, the lubrication effect of the resin causes the rearrangement of the fiber network and an increase in the preform compaction. This is called the wetting compaction mechanism. The thickness change of the preform is determined by the relative magnitude of the springback and wetting deformation mechanisms. In the compaction model, the transverse equilibrium equation is used to calculate the net compaction pressure applied to the preform, and the compaction test results are fitted to give the compressive constitutive law of the preform. The Finite Element/Control Volume (FE/CV) method is adopted to find the flow front location and the fluid pressure. The code features the ability of simultaneous integration of 1-D, 2-D and 3-D element types in a single simulation, and thus enables efficient modeling of the flow in complex mold geometries. VARTM of two flat composite panels was conducted to verify the simulation model. The composite panels were fabricated using the SAERTEX multi-axial warp knit carbon fiber fabric and SI-ZG-5A epoxy resin. Panel 1 contained one stack of the carbon fabric, and Panel 2 contained four stacks of the fabric. The parameters verified included the flow front location and preform thickness change. For Panel 1, the flow front locations were accurately predicted while the predicted resin infiltration was much slower than measured for Panel 2. The disagreement is attributed to the permeability model used in the simulation, which failed to consider the interface flow in the unstitched preform containing more than one stack of the fabric under very low compaction force. The predicted transverse displacements agree well with the experimental measurement qualitatively, but not quantitatively. The reasons for the differences were discussed, and further investigations are recommended to develop a more accurate compaction model. The simulation code was also used to investigate the VARTM of a new form of sandwich structure with through-the-thickness reinforcements, which is being considered for use in primary aircraft structure. The infiltration of three foam core sandwich preforms with different stitch densities was studied. The objective of the study was to determine whether the preforms could be completely infiltrated and how the stitch density affects the infiltration process. The visualization experiments were conducted to verify the simulation. The model accurately predicted the resin infiltration patterns. The calculated filling times underpredicted experimental times by 4 to 14%. The model revealed the resin flow details and found that increasing the stitch spacing shortens the total filling time, but increases the nonuniformity of the flow front shape. Extreme nonuniformity of the flow front shape could result in the formation of the voids.
Ph. D.

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Sayre, Jay Randall. "Vacuum-Assisted Resin Transfer Molding (VARTM) Model Development, Verification, and Process Analysis." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27034.

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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 constraints in the modeling of several different composite panels. The configuration was proposed by considering such factors as: infiltration time, the number of vacuum ports, and possible areas of void entrapment.
Ph. D.

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Yang, Huan. "Integrated analysis of unsaturated polyester and Vinylester Resins in vacuum-assisted resin transfer molding (SCRIMP) /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488205318511314.

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Cauthen, Stephen Michael. "Vacuum assisted resin transfer molding in the repair of reinforced concrete bridge structures." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008m/cauthen.pdf.

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Grimsley, Brian William. "Characterization of the Vacuum Assisted Resin Transfer Molding Process for Fabrication of Aerospace Composites." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36062.

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This work was performed under a cooporative research effort sponsored by the National Aeronautics and Space Administration (NASA) in conjunction with the aerospace industry and acedemia. One of the primary goals of NASA is to improve the safety and affordability of commercial air flight. Part of this goal includes research to reduce fuel consumption by developing lightweight carbon fiber, polymer matrix composites to replace existing metallic airframe structure. In the Twenty-first Aircraft Technology Program (TCAT) efforts were focused on developing novel processing methods to fabricate tailored composite airframe structure. The Vacuum Assisted Resin Transfer Molding (VARTM) processing technique offers a safer, more affordable alternative to manufacture large scale composite fuselages and wing structures. Vacuum assisted resin transfer molding is an infusion process originally developed for manufacturing of composites in the marine industry. The process is a variation of Resin Transfer Molding (RTM), where the rigid matched metal tooling is replaced on one side with a flexible vacuum bag. The entire process, including infusion and consolidation of the part, occurs at atmospheric pressure (101.5 kPa). High-performance composites with fiber volumes in the range of 45% to 50% can be achieved without the use of an autoclave. The main focus of the VARTM process development effort was to determine the feasibility of manufacturing aerospace quality composites with fiber volume fractions approaching 60%. A science-based approach was taken, utilizing finite element process models to characterize and develop a full understanding of the VARTM infusion process as well as the interaction of the constituent materials. Achieving aerospace quality composites requires further development not only of the VARTM process, but also of the matrix resins and fiber preforms. The present work includes an investigation of recently developed epoxy matrix resins, including the characterization of the resin cure kinetics and flow behaviors. Two different fiber preform architectures were characterized to determine the response to compaction under VARTM conditions including a study to determine the effect of thickness on maximum achievable fiber volume fraction. Experiments were also conducted to determine the permeabilities of these preforms under VARTM flow conditions. Both the compaction response and the permeabilities of the preforms were fit to empirical models which can be used as input for future work to simulate VARTM infusion using process models. Actual infusion experiments of these two types preforms were conducted using instrumented tools to determine the pressures and displacements that occur during VARTM infiltration. Flow experiments on glass tooling determined the fill-times and flow front evolution of preform specimens of various thicknesses. The results of these experiments can be used as validation of process model infusion simulations and to verify the compaction and permeability empirical models. Panels were infused with newly developed epoxy resins, cured and sectioned to determine final fiber volume fractions and part quality in an effort to verify both the infusion and compaction experimental data. The preforms characterized were found to have both elastic and inelastic compression response. The maximum fiber volume fraction of the knitted fabrics was dependent on the amount of stacks in the preform specimen. This relationship was found in the determination of the Darcy permeabilities of the preforms. The results of the characterization of the two epoxy resin systems the show that the two resins have similar minimum viscosities but significantly different curing behaviors. Characterization of the VARTM process resulted in different infusion responses in the two preform specimens investigated. The response of the saturated preform to a recompaction after infusion indicated that a significant portion of the fiber volume lost during infusion could be recovered. Fiber volume and void-content analysis of flat composite panels fabricated in VARTM using the characterized resins and preforms resulted in void-free parts with fiber volumes over 58%. Results in the idealized compaction tests indicated fiber volumes as high as 60% were achievable with the knitted fabric. The work over the presented here has led to a more complete understanding of the VARTM process but also led to more questions concerning its feasibility as an aerospace composite manufacturing technique.
Master of Science

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McGrane, Rebecca Ann. "Vacuum Assisted Resin Transfer Molding of Foam Sandwich Composite Materials: Process Development and Model Verification." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/42108.

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Vacuum assisted resin transfer molding (VARTM) is a low cost resin infusion process being developed for the manufacture of composite structures. VARTM is being evaluated for the manufacture of primary aircraft structures, including foam sandwich composite materials. One of the benefits of VARTM is the ability to resin infiltrate large or complex shaped components. However, trial and error process development of these types of composite structures can prove costly and ineffective. Therefore, process modeling of the associated flow details and infiltration times can aide in manufacturing design and optimization. The purpose of this research was to develop a process using VARTM to resin infiltrate stitched and unstitched dry carbon fiber preforms with polymethacrylimide foam cores to produce composite sandwich structures. The infiltration process was then used to experimentally verify a three-dimensional finite element model for VARTM injection of stitched sandwich structures. Using the processes developed for the resin infiltration of stitched foam core preforms, visualization experiments were performed to verify the finite element model. The flow front progression as a function of time and the total infiltration time were recorded and compared with model predictions. Four preform configurations were examined in which foam thickness and stitch row spacing were varied. For the preform with 12.7 mm thick foam core and 12.7 mm stitch row spacing, model prediction and experimental data agreed within 5%. The 12.7 mm thick foam core preform with 6.35 mm row spacing experimental and model predicted data agreed within 8%. However, for the 12.7 mm thick foam core preform with 25.4 mm row spacing, the model overpredicted infiltration times by more 20%. The final case was the 25.4 mm thick foam core preform with 12.7 mm row spacing. In this case, the model overpredicted infiltration times by more than 50%. This indicates that the model did not accurately describe flow through the needle perforations in the foam core and could be addressed by changing the mesh elements connecting the two face sheets.
Master of Science

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Saw, Kee Hong. "Simulation on filling pattern of vacuum assisted resin transfer molding (VARTM) for sectional wind blade shells." Thesis, Wichita State University, 2012. http://hdl.handle.net/10057/5610.

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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.
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering

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Robinson, Marc J. "Simulation of the vacuum assisted resin transfer molding (VARTM) process and the development of light-weight composite bridging." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3336692.

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Thesis (Ph. D.)--University of California, San Diego, 2008.
Title from first page of PDF file (viewed January 9, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 482-492).

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Books on the topic "Vacuum Assisted Resin transfer Molding"

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An Analytical Vacuum-Assisted Resin Transfer Molding (VARTM) Flow Model. Storming Media, 2000.

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Book chapters on the topic "Vacuum Assisted Resin transfer Molding"

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Kuratani, Yasunari, Kentaro Hase, Tomoe Kawazu, Aya Miki, Norimich Nanami, Hayato Nakatani, and Hiroyuki Hamada. "Comparison of Worker’s Skill During Vacuum-Assisted Resin Transfer Molding Using Motion Analysis." In Advances in Ergonomics of Manufacturing: Managing the Enterprise of the Future, 398–406. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60474-9_37.

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Chashchin, N. S., A. P. Koval, and A. S. Gruzdev. "A Study of Vacuum Assisted Resin Injection for Molding Hard-To-Reach Locations in the Manufacture of Parts." In Lecture Notes in Mechanical Engineering, 311–17. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-85233-7_37.

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Nik Wan ⓐ Wan Senik, Wan Nur Fatihah Amirah, Anuar Abu Bakar, Suriani Mat Jusoh, Asmalina Mohamed Saat, Zaimi Zainal Mukhtar, Ahmad Fitriadhy, Wan Mohd Norsani Wan Nik, and Mohd Shukry Abdul Majid. "Tensile and Morphology Analysis of Oil Palm Trunk Specimen Reinforced Epoxy Fabricated via Vacuum-Assisted Resin Transfer Moulding." In Advanced Structured Materials, 217–28. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-89988-2_17.

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Glancey, James. "Vacuum-Assisted Resin Transfer Molding." In Innovations in Materials Manufacturing, Fabrication, and Environmental Safety, 531–44. CRC Press, 2010. http://dx.doi.org/10.1201/b10386-19.

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Hsiao, K. T., and D. Heider. "Vacuum assisted resin transfer molding (VARTM) in polymer matrix composites." In Manufacturing Techniques for Polymer Matrix Composites (PMCs), 310–47. Elsevier, 2012. http://dx.doi.org/10.1533/9780857096258.3.310.

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Uddin, N., S. Cauthen, L. Ramos, and U. K. Vaidya. "Vacuum assisted resin transfer molding (VARTM) for external strengthening of structures." In Developments in Fiber-Reinforced Polymer (FRP) Composites for Civil Engineering, 77–114. Elsevier, 2013. http://dx.doi.org/10.1533/9780857098955.1.77.

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Conference papers on the topic "Vacuum Assisted Resin transfer Molding"

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Mohamed, M., R. R. Vuppalapati, S. Hawkins, K. Chandrashekhara, and T. Schuman. "Impact Characterization of Polyurethane Composites Manufactured Using Vacuum Assisted Resin Transfer Molding." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88267.

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Glass fiber reinforced composites are finding various applications due to their high specific stiffness/strength, and corrosion resistance. Vacuum assisted resin transfer molding (VARTM) is one of the commonly used low cost composite manufacturing processes. Polyurethane (PU) resin system has been observed to have better mechanical properties and higher impact strength when compared to conventional resin systems such as polyester and vinyl ester. Until recently, PU could not be used in composite manufacturing processes such as VARTM due to its low pot life. In the present work, a thermoset PU resin systems with longer pot life developed by Bayer MaterialScience is used. Glass fiber reinforced PU composites have been manufactured using one part PU resin system. Performance evaluation was conducted on these composites using tensile, flexure and impact tests. Finite element simulation was conducted to validate the mechanical tests. Results showed that PU composites manufactured using novel thermoset PU resins and VARTM process will have significant applications in infrastructure and automotive industries.

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Robinson, Marc, and John Kosmatka. "Vacuum Assisted Resin Transfer Molding Simulation for Thick Laminate Structures." In 49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
16th AIAA/ASME/AHS Adaptive Structures Conference
10t. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-2033.

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Dai, Jean, Dominique Pellaton, and H. Thomas Hahn. "Optimization of Vacuum Assisted Resin Transfer Molding for Sandwich Panels." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1492.

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Abstract The vacuum assisted resin transfer molding (VARTM) of sandwich panels may be facilitated by using high permeability layers over the skins or adding grooves in the surfaces of the core. The present paper investigates the advantages and disadvantages of both methods in terms of manufacturing cost and time through simulations and experimental observations. Before comparison, each method is optimized through simulations. The panel geometry and the injection pressure are held constant. The design parameters are the number of high permeability layers, and the number and size of grooves. The optimized processes are finally compared with each other in terms of the aforementioned cost and time. Meanwhile, the sensitivities of several important parameters in the cost model to the optimal result are studied.

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Heider, Dirk, A. Graf, Bruce K. Fink, and John W. Gillespie, Jr. "Feedback control of the vacuum-assisted resin transfer molding (VARTM) process." In Nondestructive Evaluation Techniques for Aging Infrastructures & Manufacturing, edited by David M. Pepper. SPIE, 1999. http://dx.doi.org/10.1117/12.339956.

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WOODS, B. K. S., N. WERELEY, R. HOFFMASTER, and N. NERSESSIAN. "MANUFACTURE OF BULK MAGNETORHEOLOGICAL ELASTOMERS USING VACUUM ASSISTED RESIN TRANSFER MOLDING." In Proceedings of the 10th International Conference on ERMR 2006. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812771209_0105.

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Eum, Soohyun, Kazuro Kageyama, Hideaki Murayama, Isamu Ohsawa, Kiyoshi Uzawa, Makoto Kanai, and Hirotaka Igawa. "Resin flow monitoring in vacuum-assisted resin transfer molding using optical fiber distributed sensor." In The 14th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, edited by Marcelo J. Dapino. SPIE, 2007. http://dx.doi.org/10.1117/12.715339.

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Kasprzak, Scott, John Nasr, Michael Fuqua, and Jim Glancey. "A Robotic System for Real-Time Resin Flow Modification During Vacuum-Assisted Resin Transfer Molding." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14411.

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To complement existing resin flow control strategies currently under development for Vacuum-Assisted Resin Transfer Molding (VARTM), and to provide the ability to react to unexpected changes in resin behavior during injection, a new technique for resin flow manipulation has been investigated. This approach consists of a semi-cylindrical shaped vacuum chamber placed on a mold which, when evacuated, increases the permeability of the region under the chamber by lifting the bag atop the mold. A finite element model has been developed to predict the resin flow within the mold while using the external chamber. Laboratory testing has shown significant modification in resin flow with reduced injection time. Using the external chamber, a robotic system has been prototyped that identifies dry regions forming during injection via computer vision, deploys the vacuum chamber over the mold with a robotic arm, and actuates the chamber in order to modify and correct the resin flow within the mold. Test results using lab-scale molds with large variations in preform permeabilities indicate that the robotic system can correct and/or modify the resin flow within a mold in real time, thus eliminating dry, unimpregnated regions. This computer-based method has the potential to significantly enhance molded part quality and consistency by eliminating resin starved regions within a molded composite part.

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Owusu-Ofori, Samuel P., Devdas M. Pai, and Robert L. Sadler. "Prediction of Race Tracking in Resin Transfer Molding." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0640.

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Abstract The resin transfer molding process experiences an unavoidable phenomenon known as race-tracking in which the resin flows along the edges of the mold ahead of the central flow. This phenomena may be severe whereby the resin reaches the top of the mold and exits the mold before it is completely filled. It is of interest to predict this behavior prior to the resin injection. A pre-injection method has been developed to predict whether the flow will be even or skewed and the severity of race tracking. This paper discusses how the method was developed. This method has been successfully used to predict the degree of severity of race tracking in vacuum-assisted resin transfer molding to a high degree of accuracy.

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Fuqua, Michael, and James L. Glancey. "A Port Injection Process for Improved Resin Delivery and Flow Control in Vacuum-Assisted Resin Transfer Molding." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14422.

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Vacuum Assisted Resin Transfer Molding (VARTM) is used to produce high quality composite parts at lower cost than other manufacturing methods. However, traditional VARTM injection methods are incapable of accounting for variations in preform permeability within a mold. As a result, creating complex components is a labor intensive and expensive process often requiring a trial and error approach to insure complete infusion of the preform fibers. To address this limitation, a new system for delivering resin to a VARTM mold using a series of ports in the tooling surface rather than traditional injection lines has been developed. A port injection process has been designed that utilizes a closed loop control system of ports and sensors built into the mold. Finite element models of this new process indicate complete infusion can consistently be achieved, even for mold lay-ups with large variations in permeability. Results indicate the system is capable of identifying and accounting for preform variability, and correctly delivering resin to low permeability regions usually unfilled with conventional VARTM. In addition, this new technique significantly reduces lay-up time and total time to infuse a part. Experiments with a prototype lab-scale mold have been used to validate the performance of this new injection process. Unlike a conventional VARTM setup, the innovative port injection process can deliver resin to any location within the mold, thus reducing the potential for dry regions and improving part quality and consistency.

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Zhang, Yuhong, Sergey Lopatnikov, and Dirk Heider. "Modeling of Distribution Media and Vacuum Bag Properties on Permeability Variations During Vacuum Assisted Resin Transfer Molding (VARTM)." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82732.

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This paper investigates the deformation of the vacuum film into the distribution media, its effect on the change of the unit cell porosity and ultimately the reduction of permeability of the overall system in a Vacuum Assisted Resin Transfer Molding (VARTM) process. Experimental results have shown the obvious effects of the vacuum bagging penetration into the distribution media on permeability; however, there is no analytical model to explicitly characterize this phenomenon. In this paper, we proposed an analytical model to capture the vacuum film penetration into the distribution media based on an energy approach for the first time, and then we connect this analytical model with Carman-Kozeny equation to predict the permeability variations in terms of the parameters of plastic vacuum bag and distribution media. Design curves are obtained in parametric studies to predict the permeability reduction as a function of bag modulus and thickness, and distribution media geometry. These reduction factors can be used in flow simulations to accurately predict the resin filling time for a wide variety of distribution media/flexible bag systems. Simulation results are compatible with observations from the preliminary experiment results.

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Reports on the topic "Vacuum Assisted Resin transfer Molding"

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Larimore, Zachary J., Jr Holmes, and Larry R. Tailoring Fiber Volume Fraction of Vacuum-assisted Resin Transfer Molding Processed Composite Laminates by Bladder-bag Resin Reservoir. Fort Belvoir, VA: Defense Technical Information Center, November 2012. http://dx.doi.org/10.21236/ada570166.

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Wang, Ben. Development of a High-Temperature Vacuum Assisted Resin Transfer Molding Testbed for Aerospace Grade Composites. Fort Belvoir, VA: Defense Technical Information Center, November 2005. http://dx.doi.org/10.21236/ada440199.

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Fink, Bruce K., Roopesh Mathur, Dirk Heider, Christian Hoffman, John W. Gillespie, and Jr. Experimental Validation of a Closed-Form Fluid Flow Model for Vacuum-Assisted Resin-Transfer Molding. Fort Belvoir, VA: Defense Technical Information Center, May 2001. http://dx.doi.org/10.21236/ada395181.

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Spurgeon, William A. Thickness and Reinforcement Fiber Content Control in Composites by Vacuum-Assisted Resin Transfer Molding Fabrication Processes. Fort Belvoir, VA: Defense Technical Information Center, June 2005. http://dx.doi.org/10.21236/ada436340.

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Juska, Thomas, and Steve Mayes. A Post-Cure Study of Glass/Vinyl Ester Laminates Fabricated by Vacuum Assisted Resin Transfer Molding. Fort Belvoir, VA: Defense Technical Information Center, March 1995. http://dx.doi.org/10.21236/ada298742.

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