4.2f Flashcards
What are composites?
A mixture composed of two or more materials with one acting as the matrix (glue) and the other acts as a reinforcement (fibers/sheet/particles)
What is the form of a composite
Fiber
Sheet
Particle
Matrix
What can the fibers/sheets/particles be made out of?
Textile, glass, plastics, and carbon
What can the matrix be made out of?
Thermoplastics, thermosetting plastics, ceramics, metals
What are the processes in which composites can be created?
Weaving
Molding
Pultrusion
Lamination
What is weaving?
Interlocking yarns at right angles to create a fabric
What is molding?
A mix of materials are input into a mold under high pressure
What is pultrusion?
A continuous molding process where reinforcing fibers are saturated with a liquid polymer resin and pulled through a former
What is lamination?
Laying down sheets with a matrix between them
What are composite materials? (8)
Concrete
Engineered wood
Plywood
Particle board
Fiberglass
Kevlar
Carbon reinforced plastic
Laminated veneer lumber (LVL)
What is the composition and structure of concrete and its design context?
Sand, cement , aggregate and water form a fluid that is easily molded into shape. The cement form a hard matrix binding the materials
Often used in construction
What is the composition and structure of engineered wood and its design context?
Consists of gluing veneers (sheets of wood), strands, and particles together
Often used in MDF, Particle Board, Plywood, Laminated Veneer Lumber
What is the composition and structure of Plywood and its design context?
Layers of veneer laid down and glued at 90 degrees to each other
Often used in flooring and furniture
What is the composition and structure of Particle Board and its design context?
Chips of wood glued together using resin
Often used in furniture and wall linings
What is the composition and structure of Fiberglass and its design context?
Strands of glass fiber formed into a mat then covered in resin (thermoset plastic)
Often used in pipes and vehicles
What is the composition and structure of Kevlar and its design context?
Synthetic fiber which is woven into a cloth and combines with resin
Often used in armor, sails
What is the composition and structure of Carbon Reinforced Plastic and its design context?
Made from plastic and fine fibers of glass combines with resin
Often used in sports equipment, cars
What is the composition and structure of Laminated Veneer Lumber (LVL) and its design context?
Multiple layers of thin wood are assembled with adhesives
Often used in headers, beams
What are the advantages of composite materials?
Stronger than original material
Can be created for specific applications
What are the disadvantages of composite materials?
High cost to fabricate composites
Can not be recycled (since most make use of thermosetting plastics)
