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Introduction to Composites

Introduction to Composites. Instructor: Dr. Nachiketa Tiwari, Department of Mechanical Engineering, IIT Kanpur. This course is intended for all those who want to conduct experiments in area of NVH. Thus, the course is open to students of engineering and science, and also to all those who from the industry and research organizations - who are working in area of sound, NVH and acoustics. Each lecture will be followed by a quiz, which will help student the concepts better, and gain deeper insights to measurement process. The course is fairly generic so that there is no need for a particular background. Rather, what is needed is openness, and ability to learn and check out new ideas with comfort. (from nptel.ac.in)

Lecture 38 - Transverse Strength of Unidirectional Composites

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Lecture 01 - Definition of the Composite Materials

Lecture 02 - Composite Materials and its Applications

Lecture 03 - Classification of the Composite Materials

Lecture 04 - What Makes Fiber So Strong?

Lecture 05 - Advantages and Limitations of Composite Materials

Lecture 06 - Properties of the Composite Materials

Lecture 07 - Different Types of Fiber

Lecture 08 - Production Process and Different Types of Glass Fiber

Lecture 09 - Graphite Fibers

Lecture 10 - Aramid and Boron Fibers

Lecture 11 - Ceramic Fibers

Lecture 12 - Matrix - Properties and Classifications

Lecture 13 - Polymers as Matrix Material and its Classification

Lecture 14 - Thermoset and Thermoplastic Matrix Materials

Lecture 15 - Properties of Thermoset and Thermoplastic Materials

Lecture 16 - Thermoset Materials and its Production Methods

Lecture 17 - Thermoplastics and Metals as Matrix Materials

Lecture 18 - Ceramic, Carbon Matrix Materials, and Filler Materials

Lecture 19 - What is an Appropriate Fabrication Process of a Composite?

Lecture 20 - Fabrication of Thermoset Composites

Lecture 21 - Hand Lay-Up Process

Lecture 22 - Bag Molding Process

Lecture 23 - Resin Transfer Molding Process

Lecture 24 - Fabrication of Thermoplastic, Metal and Ceramic Matrix based Composites

Lecture 25 - Terminologies and Basic Concepts

Lecture 26 - Orthotropic Material

Lecture 27 - Modeling of Unidirectional Composites

Lecture 28 - Composite Density as a Function of Mass Fraction and Volume Fraction

Lecture 29 - Calculation of Longitudinal Modulus for Unidirectional Composites

Lecture 30 - Failure Modes of Unidirectional Composite

Lecture 31 - Failure of Unidirectional Lamina

Lecture 32 - Minimum Volume Fraction and Critical Volume Fraction

Lecture 33 - Example based on Failure of Composite Material

Lecture 34 - Example based on Minimum and Critical Volume Fraction

Lecture 35 - Transverse Modulus of Unidirectional Composite

Lecture 36 - Halpin-Tsai Relation for Transverse Modulus

Lecture 37 - Transverse Modulus of Unidirectional Composites

Lecture 38 - Transverse Strength of Unidirectional Composites

Lecture 39 - Poisson's Ratio of Unidirectional Composites

Lecture 40 - Failure Modes of Composite Materials

Lecture 41 - Failure Modes of Composite Materials (cont.)

Lecture 42 - Other Properties

Lecture 43 - Concept of Tensor

Lecture 44 - Stress Transformation (Two Dimensional)

Lecture 45 - Analysis of Specially Orthotropic Lamina

Lecture 46 - Analysis of Generally Orthotropic Lamina

Lecture 47 - Transformation of Engineering Constants

Lecture 48 - Transformation of Engineering Constants (cont.)

Lecture 49 - Variation of Elastic Constants with respect to Fiber Orientation for Generally Orthotropic Lamina

Lecture 50 - Generally Orthotropic Lamina

Lecture 51 - Generalized Hooke's Law for Anisotropic Materials

Lecture 52 - Generalized Hooke's Law for Anisotropic Materials (cont.)

Lecture 53 - Elastic Constants for Specially Orthotropic Materials

Lecture 54 - Elastic Constants for Specially Orthotropic Materials in Plane Stress

Lecture 55 - Relation between Engineering Constants and Elements of Stiffness and Compliance Matrices

Lecture 56 - Relation between Engineering Constants and Elements of Stiffness and Compliance Matrices (cont.)

Lecture 57 - Stress-Strain Relations for a Lamina with Arbitrary Orientation

Lecture 58 - Stress-Strain Relations for a Lamina with Arbitrary Orientation (cont.)

Lecture 59 - Strength of an Orthotropic Lamina

Lecture 60 - Importance of Sign of Shear Stress in Context of Strength of a Unidirectional Lamina

Lecture 61 - Strain Displacement Relations for a Laminate

Lecture 62 - Stress-Strain Relations for Individual Layers of a Laminate

Lecture 63 - Resultant Forces and Moments

Lecture 64 - Relations between Force and Moment Resultant and Midplane Strains and Curvatures

Lecture 65 - Physical Significance of Extensional Stiffness Matrix, Coupling Matrix and Bending Stiffness Matrix

Lecture 66 - Lamination Sequence (Standard Laminate Code)

Lecture 67 - Calculation of A, B and D Matrices

Lecture 68 - Simplification of Stiffness Matrices

Lecture 69 - Simplification of Stiffness Matrices (cont.)

Lecture 70 - Quasi-Isotropic Laminates

Lecture 71 - Quasi-Isotropic Laminates (cont.)

Lecture 72 - Failure of Composite Laminates