COMPOSITE MATERIALS Dr.S.Nagaraja Rao
SYLLUBUS
Introduction to composite materials: Definition, Classification, Types of matrices & reinforcements, characteristics & selection, Fiber composites, laminated composites, particulate composites, prepegs, sandwich construction. 06 HRS Micro mechanical analysis of a lamina : Introduction, Evaluation of the four elastic moduli – Rule of mixture, ultimate strengths of unidirectional lamina. 04 HRS Macro mechanics of a lamina : Hooke’s law for different types of materials, number of elastic constants, Two – dimensional relationship of compliance & stiffness matrix. Hooke’s law for two dimensional angle lamina, Engineering constants – angle lamina, Invariants, Theories of failure. 10 HRS
Macro Mechanical analysis of laminate : Introduction, code, Kirchoff’s hypothesis – CLT, A,B,& D matrices, Engineering constants, Special cases of laminates, Failure criterion. 10 HRS
Manufacturing : Lay up and curing – open and closed mould processing – Hand lay –up techniques – Bag moulding and filament winding. Pultrusion, pulforming, Thermoforming, Injection moulding, Cutting, Machining and joining, tooling, Quality assurance – Introduction, material qualification, types of defects, NDT methods. 12 HRS
Application developments - aircrafts, missiles, space hardware, automobile, electrical and electronics, marine, recreational and sports equipment-future potential of composites. 02 HRS
Metal matrix composites: Re-inforcement materials, types, Characteristics & selection, base metals- selection, applications. 08 HRS
Text Books: Mein Schwartz “Composite Materials handbook” Mc Graw Hill Book Company, 1984.
Autar K. Kaw “Mechanics of composite materials” CRC Press New York.
Reference Books:
Rober M. Joness “Mechanics of composite materials” Mc-Graw Hill Kogakusha Ltd. Michael W, Hyer “Stress analysis of fiber Reinforced composite materials” Mc-Graw Hill International.
Krishan K. Chawla “Composite material science and Engineering” Springer.
P.C. Mallik “Fibre reinforced composites” Marcel Decker.
MATERIALS
HISTORY OF MATERIALS STONE AGE IRON AGE COPPER,SILVER, GOLD ALLOYS MIXTURES COMPOUNDS
COMPOSITES DEFINITION OF COMPOSITE MATERIAL: It is a mixture of two or more materials which satisfies the following conditions: 1. All constituents are present in considerable proportion(one of them atleast 5%) 2. Properties of the composite are different from individual constituents in their basic phase 3. The constituents are mixed or combined physically with required bonding agent
EXAMPLES: NATURAL---BONES,WOOD,SHELLS ARTIFICIAL-----PLYWOOD,FIBREGLASS,RCC,FRP etc.
DIFFERENCE BETWEEN ALLOYS COMPOUNDS MIXTURES COMPOSITES
NEED FOR COMPOSITES
NEW APPLICATIONS HIGH STRENGTH TO WEIGHT RATIO SAFETY DURABILITY AVAILABILITY RECYCLING WORKABILITY ECONOMY
CLASSIFICATION Composite material
Fibre reinforced composites (Fibrous composites)
Particle reinforced composites (Particle composites)
Single-layer composites Multilayered Random (including composites (angle-ply orientation having same orientation composities) and properties in each layer) Laminates Hybrids
Continuous fibre reinforced composites
Unidirectional reinforcement
Preferred orientation
Discontinuous fibre reinforced composites
Bidirectional reinforcement Random orientation (Woven reinforcements)
Preferred orientation
