scholarly journals Study on Structural Design and Analysis of Composite Boat Hull Manufactured by Resin Infusion Simulation

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5918
Author(s):  
Haseung Lee ◽  
Kyungwoo Jung ◽  
Hyunbum Park
Keyword(s):  
Structural Design ◽  
Polyester Resin ◽  
Manufacturing Cost ◽  
Resin Infusion ◽  
Composite Manufacturing ◽  
Manufacturing Method ◽  
Advanced Composite ◽  
Rtm Process ◽  
Resin Injection ◽  
Quality Product

In this paper, structural design and analysis of a composite boat hull was performed. A resin transfer molding manufacturing method was adopted for manufacturing the composite boat hull. The RTM process is an advanced composite manufacturing method that allows a much higher quality product than the hand lay-up process, and less manufacturing cost compared to the autoclave method. Therefore, the RTM manufacturing method was adopted. The mechanical properties of the various aramid fibers and polyester resin were investigated. Based on this, structural design of boat hull was performed using aramid fiber or polyester. After structural design, the optimized resin infusion analysis for RTM manufacturing method was performed. Through the resin infusion analysis, it is confirmed that the designed location of resin injection and outlet is acceptable for manufacturing.

scholarly journals Cell/Module Integration Technology with Wire-Embedded EVA Sheet

2021 ◽  
Vol 11 (9) ◽  
pp. 4170
Author(s):  
Jeong Eun Park ◽  
Won Seok Choi ◽  
Donggun Lim
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
High Power ◽  
Short Circuit ◽  
Optical Loss ◽  
Manufacturing Cost ◽  
Power Module ◽  
Manufacturing Method ◽  
Front Electrode ◽  
The Wire

Silicon wafers are crucial for determining the price of solar cell modules. To reduce the manufacturing cost of photovoltaic devices, the thicknesses of wafers are reduced. However, the conventional module manufacturing method using the tabbing process has a disadvantage in that the cell is damaged because of the high temperature and pressure of the soldering process, which is complicated, thus increasing the process cost. Consequently, when the wafer is thinned, the breakage rate increases during the module process, resulting in a lower yield; further, the module performance decreases owing to cracks and thermal stress. To solve this problem, a module manufacturing method is proposed in which cells and wires are bonded through the lamination process. This method minimizes the thermal damage and mechanical stress applied to solar cells during the tabbing process, thereby manufacturing high-power modules. When adopting this method, the front electrode should be customized because it requires busbarless solar cells different from the existing busbar solar cells. Accordingly, the front electrode was designed using various simulation programs such as Griddler 2.5 and MathCAD, and the effect of the diameter and number of wires in contact with the front finger line of the solar cell on the module characteristics was analyzed. Consequently, the efficiency of the module manufactured with 12 wires and a wire diameter of 0.36 mm exhibited the highest efficiency at 20.28%. This is because even if the optical loss increases with the diameter of the wire, the series resistance considerably decreases rather than the loss of the short-circuit current, thereby improving the fill factor. The characteristics of the wire-embedded ethylene vinyl acetate (EVA) sheet module were confirmed to be better than those of the five busbar tabbing modules manufactured by the tabbing process; further, a high-power module that sufficiently compensated for the disadvantages of the tabbing module was manufactured.

Using Computer Simulation as a Process Design Tool for Resin Injection Pultrusion (RIP)

2000 ◽  
Author(s):  
Zhongman Ding ◽  
Shoujie Li ◽  
L. James Lee ◽  
Herbert Engelen
Keyword(s):  
Modeling And Simulation ◽  
Process Design ◽  
Resin Transfer Molding ◽  
Transfer Molding ◽  
Pultrusion Process ◽  
Rtm Process ◽  
Resin Impregnation ◽  
Heating Section ◽  
Resin Injection ◽  
Resin Injection Pultrusion

Abstract Resin Injection Pultrusion (RIP) is a new composite manufacturing process, which combines the advantages of the conventional pultrusion process and the Resin Transfer Molding (RTM) process. It is sometimes referred to the Continuous Resin Transfer Molding (C-RTM) process. The RIP process differs from the conventional pultrusion process in that the resin is injected into an injection-die (instead of being placed in an open bath) in order to eliminate the emission of volatile organic compounds (styrene) (VOC) during processing. Based on the modeling and simulation of resin/fiber “pultrudability”, resin flow, and heat transfer and curing, a computer aided engineering tool has been developed for the purpose of process design. In this study, the fiber stack permeability and compressibility are measured and modeled, and the resin impregnation pattern and pressure distribution inside the fiber stack are obtained using numerical simulation. Conversion profiles in die heating section of the pultrusion die can also be obtained using the simulation tool. The correlation between the degree-of-cure profiles and the occurrence of blisters in the pultruded composite parts is discussed. Pulling force modeling and analysis are carried out to identify the effect on composite quality due to interface friction between the die surface and the moving resin/fiber mixture. Experimental data are used to verify the modeling and simulation results.

Resin Infusion of Triaxially Braided Preforms With Through-the-Thickness Reinforcement

2001 ◽  
Author(s):  
Jay R. Sayre ◽  
Alfred C. Loos
Keyword(s):  
Composite Structures ◽  
High Performance ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Element Model ◽  
Manufacturing Cost ◽  
Fiber Volume ◽  
Resin Infusion ◽  
Infiltration Process ◽  
High Fiber

Abstract Vacuum assisted resin transfer molding (VARTM) has shown potential to significantly reduce the manufacturing cost of high-performance aerospace composite structures. In this investigation, high fiber volume fraction, triaxially braided preforms with through-the-thickness stitching were successfully resin infiltrated by the VARTM process. The preforms, resin infiltrated with three different resin systems, produced cured composites that were fully wet-out and void free. A three-dimensional finite element model was used to simulation resin infusion into the preforms. The predicted flow patterns agreed well with the flow pattern observed during the infiltration process. The total infiltration times calculated using the model compared well with the measured times.

scholarly journals Buckling Analysis of an AUV Pressure Vessel with Sliding Stiffeners

2020 ◽  
Vol 8 (7) ◽  
pp. 515 ◽  
Author(s):  
Artur Siqueira Nóbrega de Freitas ◽  
Alexander Alfonso Alvarez ◽  
Roberto Ramos ◽  
Ettore Apolonio de Barros
Keyword(s):  
Cylindrical Shell ◽  
Residual Stresses ◽  
Structural Design ◽  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Manufacturing Cost ◽  
Buckling Loads ◽  
Buckling Resistance ◽  
High Hydrostatic Pressures ◽  
Innovative Concept

The structure of an autonomous underwater vehicle (AUV), usually composed of a cylindrical shell, may be exposed to high hydrostatic pressures where buckling collapse occurs before yield stress failure. In conventional submarines, welded stiffeners increase the buckling resistance, however, in small AUVs, they reduce the inner space and cause residual stresses. This work presents an innovative concept for the structural design of an AUV, proposing the use of sliding stiffeners that are part of the structure used to accommodate the electronics inside it. Since the sliding stiffeners are not welded to the shell, there are no residual stresses due to welding, the AUV fabrication process is simplified, enabling a reduction of the manufacturing cost, and the inner space is available to accommodate the equipment needed for the AUV mission. Moreover, they provide a higher buckling resistance when compared to that of an unstiffened cylindrical shell. A comparative analysis of the critical buckling loads for different shell designs was carried out considering the following: (i) the unstiffened shell, (ii) the shell with ring stiffeners, and (iii) the shell with sliding stiffeners. Results evidenced that major advantages were obtained by using the latter alternative against buckling.

Concept Design for a Composite Manufacturing Robot

2010 ◽  
Author(s):  
Michael M. Tadros
Keyword(s):  
Stacking Sequence ◽  
Concept Design ◽  
Composite Manufacturing ◽  
Manufacturing Control ◽  
Advanced Composite ◽  
Finished Part ◽  
Geometric Tolerances ◽  
Automated Processes ◽  
Small Parts ◽  
Concept Validation

Manufacturing of advanced composite test specimens and small parts in a research lab environment is often done by hand lay-up. Associated drawbacks include errors in stacking sequence, ply angles, geometry and material waste. The manufactured specimens are often used for testing and concept validation and as such should be representative of parts manufactured using fully automated processes resulting in a finished part with significantly higher quality and geometric tolerances. To this end, a concept design for a manufacturing robot has been developed and constructed. The robot suits the needs of a research lab environment size wise and rate and number of manufactured parts from pre-impregnated tape materials. Details of the concept design, manufacturing, control and operation are provided. An assessment of the robot versatility, portability versus cost is presented.

Advanced Composite Manufacturing Methods

2001 ◽  
Author(s):  
Robert Biggs ◽  
Greg Schieliet ◽  
Michael Mcbain
Keyword(s):  
Composite Manufacturing ◽  
Advanced Composite ◽  
Manufacturing Methods

Advanced composite flywheel structural design for a pulsed disk alternator

1995 ◽  
Vol 31 (1) ◽  
pp. 26-31 ◽  
Author(s):  
D.H. Curtiss ◽  
P.P. Mongeau ◽  
R.L. Puterbaugh
Keyword(s):  
Structural Design ◽  
Composite Flywheel ◽  
Advanced Composite

Safety CAE Finite Element Calculation for Pressure Cooker of Plateau Field Kitchen Unit

2013 ◽  
Vol 341-342 ◽  
pp. 501-505
Author(s):  
Han Yang ◽  
Lu Hui Wang ◽  
Ying Ze Wang ◽  
Xiang Hong Zhang ◽  
Xue Qiang Liu
Keyword(s):  
Structural Design ◽  
Small Scale ◽  
Manufacturing Cost ◽  
Element Calculation ◽  
Working Pressure ◽  
Cooking Process ◽  
Modeling Analysis ◽  
Safety And Reliability ◽  
Speed Up ◽  
Strength And Stiffness

The core equipment of plateau field kitchen unit is pressure cooker for staple food, the safety and reliability of which are the key of this project, and therefore, mechanics modeling analysis is carried out. The working theory of pressure cooker is to increase the boiling point of water by enhancing the pressure inside the cooker, so as to speed up the cooking process. In fact, the pressure cooker is a small-scale pressure container when using, normally its working pressure reaches some tens and hundreds Kpa. People pay more attention to its safety and dependability. The traditional way to increase the bearing capacity of container is usually to thicken the wall of container, by doing so, not only the manufacturing cost is increased, but also the weight, thus it is inconvenience in using and bringing. Therefore, in order to make optimum structural design of pressure cooker, reliable analysis on mechanical strength and stiffness are carried out.

Design and Manufacturing of a Metal 3D Printed kW Scale Axial Turboexpander

2019 ◽  
Author(s):  
Vaclav Novotny ◽  
Monika Vitvarova ◽  
Michal Kolovratnik ◽  
Barbora Bryksi Stunova ◽  
Vaclav Vodicka ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Surface Quality ◽  
High Efficiency ◽  
Cost Effective ◽  
Manufacturing Cost ◽  
Machining Processes ◽  
Manufacturing Method ◽  
Design And Manufacturing ◽  
3D Printed

Abstract Greater expansion of distributed power and process systems based on thermodynamic cycles with single to hundred kW scale power output is limited mainly there are not available cost-effective expanders. Turboexpanders have a perspective of high efficiency and flexibility concerning operating parameters even for the micro applications. However, they suffer from a high manufacturing cost and lead time in the development of traditional technologies (such as casting and machining processes). Additive manufacturing provides a possibility to overcome some of the issues. Manufacturing parts with complicated shapes by this technology, combining multiple components into a single part or rapid production by 3D printing for development purposes are among the prospective features with this potential. On the other hand, the 3D printing processes come with certain limitations which need to be overcome. This paper shows a design and manufacturing process of a 3 kW axial impulse air turbine working with isenthalpic drop 30 kJ/kg. Several samples to verify printing options and the turbine itself has been manufactured from stainless steel by the DMLS additive manufacturing method. Manufactured are two turbine variations regarding blade size and 3D printer settings while maintaining their specific dimensions. The turboexpanders testing method and rig is outlined. As the surface quality is an issue, several methods of post-processing of 3D printed stator and rotor blading to modify surface quality are suggested. Detailed experimental investigation is however subject of future work.

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