28-03-2012, 11:25 AM
Composite Materials
Composite Materials.ppt (Size: 879 KB / Downloads: 137)
Two inherently different materials that when combined together produce a material with properties that exceed the constituent materials.
Fiber Reinforced Polymer Matrix
Matrix
Transfer Load to Reinforcement
Temperature Resistance
Chemical Resistance
Matrix Types
Polyester
Polyesters have good mechanical properties, electrical properties and chemical resistance. Polyesters are amenable to multiple fabrication techniques and are low cost.
Vinyl Esters
Vinyl Esters are similar to polyester in performance. Vinyl esters have increased resistance to corrosive environments as well as a high degree of moisture resistance.
Epoxy
Epoxies have improved strength and stiffness properties over polyesters. Epoxies offer excellent corrosion resistance and resistance to solvents and alkalis. Cure cycles are usually longer than polyesters, however no by-products are produced.
Flexibility and improved performance is also achieved by the utilization of additives and fillers.
Fabric Structures
Woven: Series of Interlaced yarns at 90° to each other
Knit: Series of Interlooped Yarns
Braided: Series of Intertwined, Spiral Yarns
Nonwoven: Oriented fibers either mechanically, chemically, or thermally bonded