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Composite materials engineering webinar session 8 - Mechanics of composites - Part 1: Lamina level - A127

From CKN Knowledge in Practice Centre
Perspectives - A8AIM Events - Webinars - A115Composite materials engineering webinar series - A119Composite materials engineering webinar session 8 - Mechanics of composites - Part 1: Lamina level - A127
Composite materials engineering webinar session 8 - Mechanics of composites - Part 1: Lamina level
Perspectives article
A127 Video Thumbnail Image-AfsFK8YodLFR.png
Document Type Article
Document Identifier 127
Webinar Date
  • August 31, 2020

Introduction[edit | edit source]

In this session, the basics of calculating the mechanical properties of a composite material are introduced. We define a lamina, a single ply of composite material, and then give an overview of micro-mechanics, which is used to predict basic mechanical properties. With that groundwork set, Hooke’s law for orthotropic materials is reviewed and the behaviour of a lamina to loading from different directions/fiber orientations is discussed.

Webinar[edit | edit source]

Webinar slides[edit | edit source]

Webinar slides available by clicking on the icon below

PDF Icon-LK6QpdpqPx9B5d.svg

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 Overview of this webinar N/A
4 Overview of the mechanical analysis of composites Future content
5 Sign conventions for axes and orientations
6 Hooke's Law: Isotropic materials (1-Direction) Future content
7 Hooke's Law: Orthotropic materials (Part 1) Future content
8 Poisson ratios of orthotropic materials Future content
9 Hooke's Law: Orthotropic materials (Part 2) Future content
10 Micromechanics: Overview Future content
11 Micromechanics: Volume fraction Future content
12 Micromechanics: Mass (weight) fraction Future content
13 Micromechanics: Density Future content
14 Micromechanics: Stiffness calculations overview Future content
15 Micromechanics: Simplified RVE Future content
16 Micromechanics: Stiffness calculations assumptions Future content
17 Micromechanics: Longitudinal Young's modulus
18 Micromechanics: Transverse Young's modulus
19 Micromechanics: Major Poisson's ratio Future content
20 Micromechanics: In-plane shear modulus
21 Micromechanics: Summary N/A
22 Macromechanics: Overview Future content
23 Macromechanics: Stress transformation matrix Future content
24 Macromechanics: Strain transformation matrix Future content
25 Example: Stress/strain transformation Future content
26 Macromechanics: Hooke's law for angle laminates Future content
27 Macromechanics: Angle lamina compliance & coupling Future content
28 Macromechanics: Calculating engineering constants Future content
29 Macromechanics: Hooke's law for angle lamina Future content
30 Example: Macromechanics angle lamina example Future content
31 Engineering constants as a function of angle Future content
32 Wrap-up N/A
33 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

About Help
CKN KPC logo


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


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.