instructor: prof. yasser gowayed
DESCRIPTION
Knowledge based problems Fibrous composites. Instructor: Prof. Yasser Gowayed. Used with permission. Lecture outline . Definition of composite materials Types of composite materials Fibrous composites Textile composites. Definition. - PowerPoint PPT PresentationTRANSCRIPT
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Instructor: Prof. Yasser Gowayed
Knowledge based problemsFibrous composites
Used with permission
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Lecture outline
1. Definition of composite materials2. Types of composite materials3. Fibrous composites4. 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 conventionfor laminated composites
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Balanced laminate implies that for every + orientedlayer 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= Vf * f + Vm* m
Vf + Vm = 1
c = composite densityf = fiber densitym = matrix density
Vf = volume fraction of fibersVm = 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 lbPressurized Volume: 43,000ft3
Power: 110 kW (total); 45kW (users)
International Space Station
FinalConfiguratio
n2004
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Textile CMC Turbine Engines
Enabling Propulsion Materials (EPM)CMC Combustor - Lifing & Sub-element Tests
NASA Glenn, Pratt &Whitney and GE