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Instructor: Prof. Yasser Gowayed Knowledge based problems Fibrous composites Used with permission

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Lecture outline 1.Definition of composite materials 2.Types of composite materials 3.Fibrous composites 4.Textile composites

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Definition Composite materials are made by mixing two or more distinct materials, having a macroscopically recognizable interface

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Types of Composite Materials Type of inclusion spheres, rods, fibers, flakes Type of material - Polymer Matrix Composites (PMC) - Ceramic Matrix Composites (CMC) - Metal Matrix Composites (MMC)

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Fibrous Composites Fibers: strong and flexible Matrix: rigid and inert

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Laminated Composites Textile Composite (3D XYZ woven) Fibrous Composites

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Common industry practice to use angles to name layers: 0, 45, -45, 90 Laminates with similar number of like orientations share similar properties Naming convention: (0/45/90/90/-45/-0) (0/45/90)s Terminology – naming convention for laminated composites

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Balanced laminate implies that for every + oriented layer there exists a - oriented layer of the same material (45,0,90,-45,0,90) balanced, un-symmetric (45,0,90,-45,90,0,45) unbalanced, symmetric (10,0,45,-45,-10,30,-30)balanced, un-symmetric (45,-45,0,90,0,-45,45) balanced, symmetric Terminology – balance and symmetery

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The density of any composite is the product of the density of its constituents relative to their volume fraction c = V f * f + V m * m V f + V m = 1 c = composite density f = fiber density m = matrix density V f = volume fraction of fibers V m = volume fraction of matrix The rule of mixtures

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Composite manufacturing – Compression molding Fiber/matrix layers

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Composite manufacturing - Vacuum bagging

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Altitude: 220 n.m. (nominal) Inclination: 51.6 degrees Dimension: 290 ft (L) x 356 ft (W) Weight:: 940,000 lb Pressurized Volume: 43,000ft 3 Power: 110 kW (total); 45kW (users) Altitude: 220 n.m. (nominal) Inclination: 51.6 degrees Dimension: 290 ft (L) x 356 ft (W) Weight:: 940,000 lb Pressurized Volume: 43,000ft 3 Power: 110 kW (total); 45kW (users) International Space Station Final Configuration 2004 Final Configuration 2004

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Textile CMC Turbine Engines Enabling Propulsion Materials (EPM) CMC Combustor - Lifing & Sub-element Tests NASA Glenn, Pratt &Whitney and GE

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