EFFECT FROM THE ACADEMIC YEAR 2013 - 2014

 

ME 452

COMPOSITE MATERIALS

 

Instruction                                                                                                                                                                                       4 Periods per week

Duration of University Examination                                                                                                                                                  3 Hours

University Examination                          75             Marks

Sessional                                                 25             Marks

 

UNIT-I

 

Introduction: Definition and classification of Composites (PMC, MMC, •CMC), FRP Composites, Fiber Reinforcements: Fiber Types and its properties, Fiber Forms, Matrix materials and its properties: Thermoset Matrices, Thermoplastic Matrices, Applications of Composite Materials.

 

UNIT-II

 

Manufacturing Processes: Hand-Lay-up, Prepreg Lay-up, Bag Molding, Autoclave processing, Compression Molding, Resin Transfer Molding, Pultrusion, Filament Winding, Gel time test for resins, Curing Cycle.

 

Measurement of basic composite properties: Fiber and matrix tests, Tensile test, Compressive test, in-plane shear test, interlaminar shear test, flexure test.

 

UNIT-III

 

Micromechanics of Composites: Basic Concepts, Volume and Mass fraction, Heterogeneous, Anisotropic, Orthotropic, Transversely Isotropic and Isotropic Materials.

 

Mechanical Properties: Prediction of Elastic constants, micromechanical approach, Stress Partitioning Parameter, Halpin-Tsai equations.

 

Thermal Properties: Thermal Expansion, Moisture Expansion, Transport

 

Properties.

 

UNIT-IV

 

Macromechanics of Composites: Elastic constants of a lamina, relations between engineering constants and reduced stiffness and compliances, variation of lamina properties with orientation, Classification of Laminated composites, analysis of laminated composites, stresses and strain with orientation, Interlaminar stresses and edge effects.

UNIT-V

 

Strength of orthotropic Lamina: Tensile and compressive strength of unidirectional fiber composites, fracture modes in composites, delamination failure, Maximum stress theory, Maximum Strain theory, Tsai-Hill Criterion, Tsai-Wu Criterion.

 

Laminate Strength: First Ply Failure, Fiber Failure, Truncated- Maximum-

 

Strain Criterion.

 

Suggested Reading:

 

1. 1.Ronald F.Gibson, Principles of Composite Materials Mechanics,

 

McGraw-Hill, Inc, 1994.

 

1. 2.Krishna, K,Chewla, Composite Materials, Springer-Verlag, 1987.

 

1. 3.Carl. T.Herakovich, Mechanics of Fibrous Composites, John v

 

Wiley Sons inc., 1998.

 

1. 4.Ever J. Barbero, Introduction to Composite Materials Design, v

 

Taylor & Francis, 1999.

 

Jones, R.M., Mechanics of Composite Materials, McGraw-Hill Co., 1967.