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What are composite materials composed of?
A combination of materials that are mixed together to achieve specific structural properties.
Which of the following is an example of isotropic materials?
What is the main component of composite materials that carries the load?
What does the stacking sequence of the plies influence?
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What does the Warp Clock indicate?
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Fibers in a roving are typically twisted.
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A ______ is a single fiber and can also be called a strand.
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What are unidirectional prepreg tapes typically used for?
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Study Notes
Laminated Structure
- Composite materials combine different materials to enhance structural properties without fully merging them.
- Key applications in aircraft include fairings, flight control surfaces, landing gear doors, and stabilizers.
Types of Materials
- Isotropic: Properties are uniform in all directions (e.g., metal, glass).
- Anisotropic: Properties vary in perpendicular directions (e.g., wood, composites).
- Orthotropic: Properties differ in all three mutually perpendicular directions (e.g., wood).
Major Components of Composites
- Fiber: The primary load-bearing component, essential for reinforcing the composite.
- Matrix: Binds the fibers together and influences the composite's structural properties, such as stiffness and strength, which depend on the ply stacking sequence.
Fiber Orientation
- The sequence of ply orientation affects the composite material's strength and stiffness.
- Axial loads require 0° orientation, shear loads benefit from ±45° orientation, and side loads utilize 90° orientation.
Warp Clock
- Warp: Represents the longitudinal fibers of fabric.
- Warp Clock: Indicates fiber orientation on specification sheets; defaults to zero without this reference.
Fiber Forms
- Composites start with spooled unidirectional fibers, packed as continuous strands.
- Filament: A single fiber strand.
- Tows, Yarns, or Rovings: Bundled filaments; Kevlar yarns remain untwisted while fiberglass yarns typically have twists.
Roving
- Consists of a set of parallel filaments with no twist, maintaining uniform direction.
- Carbon rovings are categorized by "K" counts (3K, 6K, 12K), indicating filament quantity per bundle.
Unidirectional (Tape)
- Unidirectional prepreg tapes are predominant in aerospace manufacturing.
- Typically utilize thermosetting resins to bond fibers, produced by passing dry strands through an impregnation machine involving heat and pressure.
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Description
Test your knowledge on the materials, construction, and repair techniques in Aircraft Maintenance and Repair II, focusing on composites used in the aviation industry. This quiz is perfect for undergraduate students at Air Link International Aviation College to prepare for their studies in aircraft maintenance.
