Introduction to Composites An Aerospace Manufacturing Perspective Course Overview Composite Material Structure Composite Material Components Aluminum versus Composites Advantages and Disadvantages in Aerospace Composite Applications Composite Manufacturing Techniques Subsequent Composite Modules copyright J. Anderson, 2008 Composites in Aviation – What are composites? Combinations of different materials which yield a product with superior properties Composite armor used by the Greeks in antiquitiy – (http://www.youtube.com/watch?v=Aznz9mj5grA) Modern composites, or advanced composites are typically fiber reinforced plastics. copyright J. Anderson, 2008 Fiber Reinforced Plastic (FRP) Composites Consists of at least two materials – Plastic which binds the fibers together, also called the matrix – Fibers, typically small in diameter and long in length Fibers may also be short in length to facilitate processing – e.g., injection molded nylon with glass fibers – In general the matrix imparts toughness, or crack resistance, and the fiber imparts ultimate strength copyright J. Anderson, 2008 Fiber Reinforced Plastic Composites, contd. Fibers Plastic Matrix copyright J. Anderson, 2008 Function of the Fiber Carry the load – Provide structural properties to the composite – – – 70 to 90% of load carried by fibers Stiffness Strength Thermal stability Provide electrical conductivity or insulation copyright J. Anderson, 2008 Function of the Matrix Binds the fibers together Provides rigidity and shape to the structure Isolates fibers to slow crack propagation Surface quality Corrosion and wear protection for fibers copyright J. Anderson, 2008