Manufacture and Testing of a Moderate Size Integrated Marine Composite Propeller

2011 ◽  
Vol 194-196 ◽  
pp. 1485-1488
Author(s):  
Xiao Dong He ◽  
Hong Ming Zhang ◽  
Rong Guo Wang ◽  
Yi Hong
Keyword(s):  
Composite Material ◽  
Resin Transfer Molding ◽  
High Strength ◽  
Structural Performance ◽  
Resin Flow ◽  
Marine Propeller ◽  
Transfer Molding ◽  
Moderate Size ◽  
Layer Sequence ◽  
Marine Composite

The composite material has high strength-to-weight, stiffness-to-weight ratios and it has the layer designing property to satisfy special mechanical requirement. Nowadays, the marine produce industry makes efforts to use composites for marine propeller to improve the hydrodynamic and structural performance. In this paper, the authors use FEA coupled CFD to design the layer sequence of composite propeller and develop ANSYS subroutine to simulate resin flow in the mould. The composite propeller is produced by RTM (resin transfer molding) and tested to measure the performance of composite propeller. Compared to the same size aluminum propeller, the composite propeller saves 39% weight and has less noise.

scholarly journals COMPUTATIONAL MODELING OF RTM AND LRTM PROCESSES APPLIED TO COMPLEX GEOMETRIES

2012 ◽  
Vol 11 (1-2) ◽  
pp. 93 ◽  
Author(s):  
J. Da S. Porto ◽  
M. Letzow ◽  
E. D. Dos Santos ◽  
S. C. Amico ◽  
J. A. Souza ◽  
...  
Keyword(s):  
Porous Medium ◽  
Flow Behavior ◽  
Resin Transfer Molding ◽  
Three Dimensional ◽  
Complex Geometries ◽  
Resin Flow ◽  
Transfer Molding ◽  
Rtm Process ◽  
General Terms ◽  
Filling Time

Light Resin Transfer Molding (LRTM) is a variation of the conventional manufacturing process known as Resin Transfer Molding (RTM). In general terms, these manufacturing processes consist of a closed mould with a preplaced fibrous preform through which a polymeric resin is injected, filling the mold completely, producing parts with complex geometries (in general) and good finish. Those processes differ, among other aspects, in the way that injection occurs. In the RTM process the resin is injected through discrete points whereas in LRTM it is injected into an empty channel (with no porous medium) which surrounds the entire mold perimeter. There are several numerical studies involving the RTM process but LRTM has not been explored enough by the scientific community. Based on that, this work proposes a numerical model developed in the FLUENT package to study the resin flow behavior in the LRTM process. Darcy’s law and Volume of Fluid method (VOF) are used to treat the interaction between air and resin during the flow in the porous medium, i.e. the mold filling problem. Moreover, two three-dimensional geometries were numerically simulated considering the RTM and LRTM processes. It was possible to note the huge differences about resin flow behavior and filling time between these processes to manufacture the same parts.

Similarity Relations of Resin Flow in Resin Transfer Molding Process

2009 ◽  
Vol 18 (2) ◽  
pp. 135-152 ◽  
Author(s):  
Moon-Kwang Um ◽  
Joon-Hyung Byun ◽  
Isaac M. Daniel
Keyword(s):  
Resin Transfer Molding ◽  
Resin Flow ◽  
Molding Process ◽  
Transfer Molding ◽  
Similarity Relations

scholarly journals A Semi-Analytical Model to Predict Infusion Time and Reinforcement Thickness in VARTM and SCRIMP Processes

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 20 ◽  
Author(s):  
Felice Rubino ◽  
Pierpaolo Carlone
Keyword(s):  
Resin Transfer Molding ◽  
Resin Flow ◽  
Liquid Composite Molding ◽  
Molding Process ◽  
Transfer Molding ◽  
Deformable Porous Media ◽  
Filling Time ◽  
Composite Molding ◽  
Fabric Deformation ◽  
Porosity And Permeability

In liquid composite molding processes, such as resin transfer molding (RTM) and vacuum assisted resin transfer molding (VARTM), the resin is drawn through fiber preforms in a closed mold by an induced pressure gradient. Unlike the RTM, where a rigid mold is employed, in VARTM, a flexible bag is commonly used as the upper-half mold. In this case, fabric deformation can take place during the impregnation process as the resin pressure inside the preform changes, resulting in continuous variations of reinforcement thickness, porosity, and permeability. The proper approach to simulate the resin flow, therefore, requires coupling deformation and pressure field making the process modeling more complex and computationally demanding. The present work proposes an efficient methodology to add the effects of the preform compaction on the resin flow when a deformable porous media is considered. The developed methodology was also applied in the case of Seeman’s Composite Resin Infusion Molding Process (SCRIMP). Numerical outcomes highlighted that preform compaction significantly affects the resin flow and the filling time. In particular, the more compliant the preform, the more time is required to complete the impregnation. On the other hand, in the case of SCRIMP, the results pointed out that the resin flow is mainly ruled by the high permeability network.

Particle distribution from in-plane resin flow in a resin transfer molding process

2018 ◽  
Vol 59 (1) ◽  
pp. 22-34 ◽  
Author(s):  
Bryan M. Louis ◽  
Jesus Maldonado ◽  
Florian Klunker ◽  
Paolo Ermanni
Keyword(s):  
Particle Distribution ◽  
Resin Transfer Molding ◽  
Resin Flow ◽  
Molding Process ◽  
Transfer Molding

Rheological Behaviors Characterization and Modeling of a Novel Three-Branched Phenylethynyl-Terminated Imide Oligomer

2011 ◽  
Vol 199-200 ◽  
pp. 83-86
Author(s):  
Chang Wei Liu ◽  
Xiao Gang Zhao ◽  
Cheng Yang Wang ◽  
Xiao Hui Yu ◽  
He Jia ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Composite Material ◽  
High Performance ◽  
Resin Transfer Molding ◽  
Experimental Measurements ◽  
Melt Viscosity ◽  
Arrhenius Model ◽  
Excellent Thermal Stability ◽  
Transfer Molding ◽  
High Performance Resin

To prepare novel polyimides with enhanced thermal stability and low melt viscosity, a novel three-branched phenylethynyl-terminated imide oligomer was introduced. The oligomer can be used to prepare high performance resin-based composite material via resin transfer molding (RTM) due to its low melt viscosity (<2Pa.s) between 250°C and 320°C. The cured resin exhibits excellent thermal stability and higher glass transition temperature than PETI series as a result of the introduction of star-branched units. In this research, the rheological properties of the oligomer were measured and numerically fit with the dual Arrhenius model to predict the progression of the viscosity during cure. The calculated kinetic activation energies for gelation with two different Arrhenius equations, 120.8kJ/mol and 164kJ/mol, respectively,had some differences. The numerical results were compared with the experimental measurements, and it was found that the model predicts the experimental observations quite well.

Resin flow monitoring in vacuum-assisted resin transfer molding using optical fiber distributed sensor

2007 ◽  
Author(s):  
Soohyun Eum ◽  
Kazuro Kageyama ◽  
Hideaki Murayama ◽  
Isamu Ohsawa ◽  
Kiyoshi Uzawa ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Resin Transfer Molding ◽  
Resin Flow ◽  
Distributed Sensor ◽  
Transfer Molding ◽  
Flow Monitoring
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