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Composite materials engineering webinar session 11 - Defects - A130

From CKN Knowledge in Practice Centre
Perspectives - A8AIM Events - Webinars - A115Composite materials engineering webinar series - A119Composite materials engineering webinar session 11 - Defects - A130
 
Composite materials engineering webinar session 11 - Defects
Perspectives article
A130 Video Thumbnail Image-iF9R3dkhsnHz.png
Document Type Article
Document Identifier 130
Tags
Webinar Date
  • October 28, 2020

Introduction[edit | edit source]

Defects in composite materials are a major concern. They typically occur during processing and often become the limiting factor of a part’s performance. In this session we introduce and classify various types of defects, then go into more detail on common defects such as thermal issues during cure, dimensional control, porosity, and fiber misalignment.

Webinar[edit | edit source]

Webinar slides[edit | edit source]

Webinar slides available by clicking on the icon below

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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 Overview of webinar series
3 Outcomes of this webinar N/A
4 Introduction to defects Future content
5 Classification of defects Future content
6 Defect group: Deposition & Cure Future content
7 Defect group: Geometry/Dimensional errors Future content
8 Defect group: Machining, assembly & handling Future content
9 Defect: Under-cure
10 Measurement: Measuring degree of cure
11 Consequences of under-cure
12 Methods of preventing under-cure
13 Defect:Exotherm/Thermal degradation Future content
14 Defect: Dimensional control Future content
15 Consequences of dimensional control defects Future content
16 Methods of preventing dimensional control defects Future content
17 Example of dimensional control defects in a part Future content
18 Dimensional control thickness defects Future content
19 Defect: Porosity Future content
20 Porosity: Intra-tow vs inter-tow Future content
21 Porosity: Autoclave cure vs out-of-autoclave cure Future content
22 Defect: Fibre misalignment Future content
23 Fibre misalignment due to wrinkling Future content
24 Fibre misalignment due to draping Future content
25 Defect: Incoming material variability Future content
26 Wrap-up N/A
27 Q&A N/A


Related pages

Page type Links
Introduction to Composites Articles
Foundational Knowledge Articles
Foundational Knowledge Method Documents
Foundational Knowledge Worked Examples
Systems Knowledge Articles
Systems Knowledge Method Documents
Systems Knowledge Worked Examples
Systems Catalogue Articles
Systems Catalogue Objects – Material
Systems Catalogue Objects – Shape
Systems Catalogue Objects – Tooling and consumables
Systems Catalogue Objects – Equipment
Practice Documents
Case Studies
Perspectives Articles



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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 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.

The relationship between material, shape, tooling & consumables and equipment during a process step


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:

The relationship between function, material, shape and process


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.

The relationship between function, material, shape and process consisting of Equipment and Tooling and consumables


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.