Classification of certain materials as a composite: 1 Based on the type of matrix material 2) Rayon Pitch - residue of petroleum refining (Pitch Based)
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Composite materials are classified based on: (a) Type of matrix Major load carrier in dispersion-strengthened composites (a) Matrix (b) Fiber (c) Both
1 Classification of Composite Materials
According to the nature of the matrix material we classify organic, mineral or metallic matrix composites • Organic matrix composites are polymer resins with
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There are two classification systems of composite materials One of them is based on the matrix material (metal, ceramic, polymer) and the second is based on
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BASED ON THE TYPE OF MATRIX • Organic Matrix Composites (OMCs) – • Polymer Matrix Composites (PMCs) • Carbon matrix composites (carbon-carbon
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Classification of certain materials as a composite: 1 Based on the type of matrix material 2) Rayon Pitch - residue of petroleum refining (Pitch Based)
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Composites are classified according to: -- the matrix material (CMC, MMC, PMC) -- the reinforcement geometry (particles, fibers, layers)
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One simple scheme for the classification of composite materials is shown in Fig- between these is based upon reinforcement or strengthening mechanism
pdf CLASSIFICATION OF COMPOSITES - IDC-Online
One of them is based on the matrix material (metal ceramic polymer) and the second is based on the material structure: Classification of composites I (based on matrix material) Metal Matrix Composites (MMC)
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AE-681 Composite Materials
Instructor
Dr PMMohite
Instructor
:Dr PMMohite
Office:AE-11,Aerospace Engineering
Email: mohite@iitk.ac.inPh: 6024
Course Credits:4
LTPD:3-0-0-0Course Content:•
Introduction
Definition
classification behaviors of unidirectional composites•Introduction
Definition
classification behaviors of unidirectional composites •Analysis of lamina; constitutive classical laminate theory, thermal stresses, •Design consideration, analysis of laminates after initial failure, interlaminart ft hi jit d itl htitis t resses, f rac t ure mec h an i cs, j o in t san d exper i men t a l c h arac t eri za ti on, •Micromechanics •Factors influencing strength and stiffness failure modes, •Performance under adverse environment •Prediction of strength, stiffnessAE-681 Composite Materials
Reference
Books/Material
Reference
Books/Material
•Mechanics of Fibrous Composites, CT Herakovich.•Analysis and Performance of Fibre Composites, BD Agarwal and LJ Broutman.•Mechanics of Composite Materials, RM Christensen.
•Any other book on composite materials •Research papersGrading Policy:Midsem
I II 40Midsem
I II 40Assignments: 20% (Individual + Group)
Endsem: 40%
•Absolute 40% for passing. Relative grading after that.•Assignments should be submitted on due date by 5.00 pm. Late submissionand copying will be heavily penalized !
•Attendance will be monitored regularly.About Fibrous Composites
Composite: Formal Definition and HistoryWhat
is composite? What is composite?Definition:
•A material which is composed of two or more materials at a microscopic scale d h hill di ti t h an d h ave c h em i ca ll y di s ti nc t p h ases. •Heterogeneous at a microscopic scale but statically homogeneous at macroscopic scale. •Constituent materials have significantly different properties.Classification of certain materials as a composite:1. Combination of materials should result in significant property changes2
Content
of the constituents is generally more than 10 2Content
of the constituents is generally more than 103. In general, property of one constituent is much greater (5) than the other
Composite: Formal DefinitionHistory
Oldest
application/existence of composite material?History
Oldest
application/existence of composite material?4000 B.C. - laminated writing material from the papyrus plant1300 B.C. - Egyptians and Mesopotamian used straw bricks
1200A.D. - Mongols invented the first composite bow
Composite: Formal Definition and HistoryComposite
Bow dates back to 3000BC (Angara
Dating)
Composite
Bow dates back to 3000BC (Angara
Dating)
Materials Used:
Wood, Horn, Sinew (Tendon), Leather, Bamboo
andAntle r (Dee r horn)Horn andAntler:naturally flexible and resilient
Sinews:back tendons or hamstrings of cows and deerGlue:From bladder of fishStrings:Sinew, Horse hair, Silk
Overall processing time was almost a year !Source: http://medieval2.heavengames.comComposite: Formal Definition and HistoryComposite
Bow dates back to 3000BC (Angara
Dating)
Composite
Bow dates back to 3000BC (Angara
Dating)
Evolution of MaterialsSource: MFAshby. Phil. Trans R. Soc. LondonA1987(332):393-407.Composite: Examples from Day-to-Day LifeExamples
Examples
1. Straw-bricks
2. Concrete3. Wood
(cellulose + lignin)4. Human body
(muscles + bones)5. Tyres
6Plywood
6Plywood
7. Sports good ........................
Evolution of MaterialsUse
ofModern
(Polymer)Composites
Use ofModern
(Polymer)Composites
During World War II-
Military application
Non-metallic shielding of Radomes
(to house electronic radar equipments)Glass Fibre Reinforced Plastics(GFRP)
The first application of wood - compositelaminatesin - Havilland Mosquito Fighter/Bomber of British RoyalAir-ForceEvolution of MaterialsUse
ofModern
(Polymer)Composites
Use ofModern
(Polymer)Composites
During World War II-
Attack on Pearl Harbour by Japanese
Torpedo bomber
Sopwith Cuckoo Fairey Swordfish
Source: http://en.wikipedia.org/wiki/Torpedo_bomberComposite: NecessicityWhy
do you need composite materials? Why do you need composite materials?Enhanced desired properties !
What are these desired properties?
•Strength •Stiffness•Toughness •Corrosion resistance• Wear resistance Wear resistance •Reduced weight •Fatigue life•Thermal/Electrical insulation and conductivity •Acoustic insulation •Energy dissipation•Attractiveness, cost, .......................... •Tailorable propertiesComposite: NecessicityHigh
Fatigue
Life HighFatigue
Life180.0200.0
1241.1379.
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