JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-Requisites

Theory of Structures

Course Objectives:

• Understand the fabrication, analysis and design of composite materials & structures.
• Explain basic composites technology, including materials and processes, manufacturing, structural design, maintenance, proof of structures and other considerations.
• Identify the static testing procedure and repairing methodology of composite structural members and joints.
• Enrich to develop structural designs using composite materials.

Course Outcomes:

• Design of composite material
• Technique to solve and repair composite structure

UNIT - I

Stress Strain Relation: Introduction- Advantages and application of composite materials, reinforcements and matrices; Generalized Hooke‘s Law; Elastic constants for anisotropic, orthotropic and isotropic materials.

UNIT - II

Methods of Analysis: Micro mechanics: Mechanics of materials approach, elasticity approach to determine material properties; Macro Mechanics; Stress-strain relations with respect to natural axis, arbitrary axis; Determination of material properties; Experimental characterization of lamina.

UNIT - III

Laminated Plates, Sandwich Constructions and Fabrication Process: Governing differential equation for a general laminate, angle ply and cross ply laminates; Failure criteria for composites. Basic design concepts of sandwich construction; Materials used for sandwich construction; Failure modes of sandwich panels; Various open and closed mould processes; Manufacture of fibers; Types of resins and properties and applications; Netting analysis.

UNIT - IV

Damage Tolerance In Composites: Introduction, sources of damage, types of damage, FAR requirements and advisory circulars, building block approach; Impact damages: Damage growth under fatigue loads; residual strength: Tests and analytical methods; Detailed design: Basics of projections, drawing standards and conventions, introduction to CADD, design of composite parts and assembly design; Optimization: Fundamentals of optimization, mathematical concepts in optimization, Optimization of composite plates.

UNIT - V

TESTING OF COMPOSITE STRUCTURES: Factors influencing testing, test environment, test methods and standards, introduction to static testing of composite structures and examples; Repair of composite aircraft structures: Introduction to repair, repair philosophy, repair sequence, repair criteria, damage assessment, classification of repair, selection of repair joints, repair procedures, certification of repair.

TEXT BOOKS:

• 1. Gibson, R. F, ―Principles of Composite Material Mechanicsǁ, CRC Press, 2nd Edition, 2007. R18 B.TECH AERONAUTICAL ENGG. III YEAR
• 2. Jones, R.M, Taylor & Francis, ―Mechanics of Composite Materialsǁ, 2nd Edition, 2010 (Indian Print).
• 3. Reddy, J.N., ―Mechanics of Laminated Composite Plates and Shells – Theory and Analysisǁ, CRC Press, 2nd Edition, 2004.

REFERENCE BOOKS:

• 1. Agarwal, B.D., and Broutman, L.J., ―Analysis and Performance of Fibre Compositesǁ, John Wiley and sons. Inc., New York, 1995.
• 2. Lubin, G., ―Handbook on Advanced Plastics and Fibre Glassǁ, Von Nostrand Reinhold Co., New York, 1989.
• 3. Autar K. Kaw ―Mechanics of Composite Materialsǁ, 2nd Edition, CRC Press, 2005. R18 B.TECH AERONAUTICAL ENGG. III YEAR