JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Structure and properties of composite materials and design procedures for composite

structures

Course objectives: To identify the properties of fiber and matrix materials used in commercial composites as well as some common manufacturing teaching and to predict the elastic properties of both long and short fiber and understand the stress-strain relations and establish the failure criteria for laminated structures.

Course Outcomes

At the end of the course the students will be able to

• Understanding of types, manufacturing processes, and applications of composite materials.
• Basic understanding of linear elasticity with emphasis on the difference between isotropic and anisotropic material behavior.
• Ability to analyze problems on macro and micro mechanical behavior of lamina
• Ability to analyze problems on macro mechanical behavior of laminate
• An ability to predict the loads and moments that cause an individual composite layer and a composite laminate to fail and to compute hygro thermal loads in composites.
• An ability to compute the properties of a composite laminate with any stacking sequence.
• An ability to use the ideas developed in the analysis of composites towards using composites in aerospace design.

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 .

UNIT - II

Reinforcements: Fibers- Glass, Silica, Kevlar, carbon, boron, silicon carbide, and born carbide fibers. Particulate composites, Polymer composites, Thermoplastics, Thermosetts, Metal matrix and ceramic composites. Manufacturing methods: Autoclave, tape production, moulding methods, filament winding, man layup, pultrusion, RTM.

UNIT - III

Macro mechanical Analysis of a Lamina: Introduction, Definitions Stress, Strain, Elastic Moduli, Strain Energy. Hooke’s Law for Different Types of Materials, Hooke’s Law for a Two-Dimensional Unidirectional Lamina, Plane Stress Assumption, Reduction of Hooke’s Law in Three Dimensions to Two Dimensions, Relationship of Compliance and Stiffness Matrix to Engineering Elastic Constants of a Lamina.

UNIT - IV

Macro mechanical Analysis of Laminates: Introduction, Laminate Code, Stress–Strain Relations for a Laminate, In-Plane and Flexural Modulus of a Laminate, Hygrothermal Effects in a Laminate, Warpage of Laminates.

UNIT - V

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.

R19 M.Tech. CAD/CAM

TEXT BOOKS:

• 1. Mechanics of Composite Materials, Second Edition (Mechanical Engineering), By Autar K.Kaw, Publisher: CRC.
• 2. Engineering Mechanics of Composite Materials by Isaac and M Daniel, Oxford University Press, 1994.

REFERENCE BOOK:

• 1. Analysis and performance of fibre Composites by B. D. Agarwal and L. J. Broutman, Wiley- Interscience, New York, 1980. R19 M.Tech. CAD/CAM M. TECH. II Year I Sem. (CAD/CAM)