Reference - Characterization and analysis of flow behavior in the FASTRAC process for the manufacture of sandwich and core composite structures
| Type | Journal |
|---|---|
| Title | Characterization and analysis of flow behavior in the FASTRAC process for the manufacture of sandwich and core composite structures |
| Abstract | Fast Remotely Actuated Channeling (FASTRAC) is a vacuum-assisted process recently developed at the U. S. Army Research Laboratory, which uses a double vacuum bag with a low cost non-contacting tool that creates distribution channels for accelerating resin flow during infusion. The infusion flow behavior is dependent upon how the distribution channels form during the process. The process requires careful and systematic understanding of several important processing parameters that influence the flow behavior during the infusion of the dry fabric preforms. Embedded impermeable materials (metal, ceramic, or sandwich-core structures) further complicate the flow pattern, since they form preferential flow paths within the composite system. This paper focuses on the analysis and characterization of the flow behavior during the FASTRAC process used to manufacture sandwich and core composite structures via experimental investigation. Experimental data using FASTRAC process will be compared with the infusion behavior during traditional VARTM process. |
| Authors |
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| Date | 2003 |
| Pages | 303-311 |
| Journal | International SAMPE Symposium and Exhibition (Proceedings) |
| Volume | 48 I |
| ISSN | 08910138 |
| Keywords | Fast Remotely Actuated Channeling (FASTRAC), Manufacturing, Vacuum-Assisted Resin Transfer Molding (VARTM) |
Welcome
Welcome to the CKN Knowledge in Practice Centre (KPC). The KPC is a resource for learning and applying scientific knowledge to the practice of composites manufacturing. As you navigate around the KPC, refer back to the information on this right-hand pane as a resource for understanding the intricacies of composites processing and why the KPC is laid out in the way that it is. The following video explains the KPC approach:
Understanding Composites Processing
The Knowledge in Practice Centre (KPC) is centered around a structured method of thinking about composite material manufacturing. From the top down, the heirarchy consists of:
- The factory
- Factory cells and/or the factory layout
- Process steps (embodied in the factory process flow) consisting of:
The way that the material, shape, tooling & consumables and equipment (abbreviated as MSTE) interact with each other during a process step is critical to the outcome of the manufacturing step, and ultimately critical to the quality of the finished part. The interactions between MSTE during a process step can be numerous and complex, but the Knowledge in Practice Centre aims to make you aware of these interactions, understand how one parameter affects another, and understand how to analyze the problem using a systems based approach. Using this approach, the factory can then be developed with a complete understanding and control of all interactions.
Interrelationship of Function, Shape, Material & Process
Design for manufacturing is critical to ensuring the producibility of a part. Trouble arises when it is considered too late or not at all in the design process. Conversely, process design (controlling the interactions between shape, material, tooling & consumables and equipment to achieve a desired outcome) must always consider the shape and material of the part. Ashby has developed and popularized the approach linking design (function) to the choice of material and shape, which influence the process selected and vice versa, as shown below:
Within the Knowledge in Practice Centre the same methodology is applied but the process is more fully defined by also explicitly calling out the equipment and tooling & consumables. Note that in common usage, a process which consists of many steps can be arbitrarily defined by just one step, e.g. "spray-up". Though convenient, this can be misleading.
Workflows
The KPC's Practice and Case Study volumes consist of three types of workflows:
- Development - Analyzing the interactions between MSTE in the process steps to make decisions on processing parameters and understanding how the process steps and factory cells fit within the factory.
- Troubleshooting - Guiding you to possible causes of processing issues affecting either cost, rate or quality and directing you to the most appropriate development workflow to improve the process
- Optimization - An expansion on the development workflows where a larger number of options are considered to achieve the best mixture of cost, rate & quality for your application.
