Fabric Forming: how it affects design and processing, and how simulation can address this - A310
| Fabric Forming: how it affects design and processing, and how simulation can address this | |
|---|---|
| Perspectives article | |
| |
| Document Type | Article |
| Document Identifier | 310 |
| Themes | |
| Tags | |
|
Webinar Date
| |
Introduction[edit | edit source]
One unique benefit that composite materials have is the ability to be formed into complex geometries that other materials struggle with. Forming fabric into these geometries is key to producing these geometries.
If the wrong fabric is used for a particular geometry and/or process it can lead to defects, such as severe fibre distortion, porosity, reduced fibre volume fraction, and undesirable part thicknesses. In a worst-case scenario, it could lead to scrapping tooling and materials, and going back to the beginning of the design/material selection process.
In this webinar, we discuss how forming fibre material into a shape effects part design, material selection, and processing. We introduce forming testing and simulation and discuss how it can be used in common applications with attention to fabric wrinkling defects.
This webinar has been presented by our invited speaker, Professor Abbas Milani from The University of British Columbia's Okanagan campus. If you have an interest in sharing your knowledge about composites through CKN and the Knowledge in Practice centre, please contact us to discuss further.
Webinar[edit | edit source]
Webinar slides[edit | edit source]
Webinar slides available by clicking on the icon below
Additional information for select chapters[edit | edit source]
| Chapter | Chapter Title | Links to related information in the Knowledge in Practice Centre |
|---|---|---|
| 1 | Welcome & introductions | N/A |
| 2 | Knowledge in Practice Centre | |
| 3 | Overview | N/A |
| 4 | Quality Management in Composites Manufacturing | |
| 5 | Fibre geometrical defects from typical processes | Future content |
| 6 | Effect of wrinkles on parts | Future content |
| 7 | Sources of wrinkles | Future content |
| 8 | Forming-induced wrinkling (shear) | Future content |
| 9 | Forming-induced wrinkling (compression & shear) | Future content |
| 10 | Preventing wrinkles | Future content |
| 11 | Shear-tension coupling in deformation of fabrics | Future content |
| 12 | Multi-scale nature of reinforcing woven fabric | |
| 13 | Characterization tests for fabric forming inputs | Future content |
| 14 | Characterization: Uniaxial tension | Future content |
| 15 | Characterization: Shear | Future content |
| 16 | Effect and importance of intra-yarn shear | Future content |
| 17 | Combined biaxial tension-shear characterization | Future content |
| 18 | Out-of-plane bending characterization | Future content |
| 19 | Examples of full-scale, macro forming simulation | Future content |
| 20 | Example of double-dome forming simulation | Future content |
| 21 | Meso-scale shear simulation | Future content |
| 22 | Property homogenization for forming simulation | Future content |
| 23 | Summary of forming-induced wrinkling | N/A |
| 24 | Process induced wrinkling | N/A |
| 25 | Inter-ply friction/lubrication modes in laminates | Future content |
| 26 | Ply-to-ply experimental friction characterization | Future content |
| 27 | Case study: Manufacture of L and C sections | Future content |
| 28 | Summary & wrap-up | N/A |
| 29 | Q&A | N/A |
Related pages
 |
 |
| About | Help |
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.
