JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Overview

Course Overview: This course is designed for building foundational knowledge in composites. It introduces the concept of: (1) Characterization and application of composite, (2) the methods of composite strengthening, and (3) production routes and performance of composites.

Course Objectives:

• 1. An ability to identify the properties of fiber and matrix materials used in commercial composites, as well as some common manufacturing techniques.
• 2. An ability to predict the elastic properties of both long and short fiber composites based on the constituent properties.
• 3. An ability to rotate stress, strain and stiffness tensors using ideas from matrix algebra.

UNIT - I

Introduction to Composite Materials: Introduction, classification, polymer matrix composites, metal matrix composites, ceramic matrix composites, carbon-carbon composites, fiber, reinforced composites and nature-made composites and applications. Reinforcements: Fibers Glass, Silica, Kevlar, carbon, boron, silicon carbide, and born carbide, fibres. Particulate composites, Polymer composites, Thermoplastics, Thermosetts, Metal matrix and ceramic composites.

UNIT - II

Manufacturing Methods: Autoclave, tape production, moulding methods, filament winding, man layup, pultrusion, RTM. Macro mechanical Analysis of a "Lamina": introduction, Definitions: stress, strain, Elastic Moduli, strain Energy. Hooke's Law for different types of materials, Hooks Law for a two dimensional unidirectional lamina, plane stress assumption, reduction of Hooks Law in three dimensions to two dimensions, relationship of compliance and stiffness matrix to engineering elastic constants of a lamina.

UNIT - III

Hooke’s Law for a Two-Dimensional Angle Lamina, Engineering constants of an Angle Lamina. Invariant Form of Stiffness and compliance Matrices for an Angle Lamina Strength Failure. Envelops, Maximum Strain Failure Theory, Tsai-Hill Failure Theory, Tsai-Wu Failure Theory Comparison of Experimental Results with Failure Theories. Hygrothermal Stresses and Strains in a Lamina: Hygrothermal Stress-Strain Relationships for a Unidirectional Lamina, Hygrothermal Stress-Strain Relationships for a Angle Lamina.

R16 B.TECH MECHATRONICS.

UNIT - IV

Micromechanical Analysis of A Lamina: Introduction, Volume and Mass Fractions, Density, and Void Content, Evaluation of the Four Elastic Moduli, Strength of Materials Approach, Semi Empirical Models Elasticity Approach, Elastic Moduli of Lamina with Transversely Isotropic Fibers, Ultimate Strengths of a Unidirectional Lamina, Coefficients of Thermal Expansion, Coefficients of Moisture Expansion .

UNIT - V

Macro mechanical Analysis of Laminates: Introduction, Laminate Code, Stress-Strain Relations for a Laminate, In-Plane and Flexural Modules of a Laminate, Hygrothermal Effects in a Laminate, Warpage of Laminates. Failure Analysis and Design of Laminates: Introduction Special Cases of Laminates, Failure Criterion for a Laminate, Design of a Laminated Composite, Other Mechanical Design Issues

TEXT BOOKS:

• 1. Engineering Mechanics of Composite materials by Issac and M Daniel
• 2. R.M Jones, Mechanics of composite Materials, McGraw Hill Company, New York, 1975

REFERENCE BOOKS:

• 1. D. Agarwal and L. Broutman, Analysis and performance of fibre Composites, Wiley- interscience.
• 2. L.R Calcote, Analysis of Laminated Composite Structures, Van Nostrand Rainfold, New York, 1969
• 3. Mechanics of Composite Materials, Mukhopadhyay R16 B.TECH MECHATRONICS.