JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• 1. To gain and understanding of the response of various metals under the application of stress and/or temperature.
• 2. To build necessary theoretical back ground of the role of lattice defects in governing both elastic and plastic properties of metals will be discussed.
• 3. Obtain a working knowledge of various hardness testing machines BHN, VHN, RHN
• 4. Obtain a working knowledge of creep and fatigue and analysis of data.

Course Outcomes

At the end of the course the student will be able to:

• 1. Classify mechanical testing of ferrous and non-ferrous metals and alloys.
• 2. Recognize the importance of crystal defects including dislocations in plastic deformation.
• 3. Identify the testing methods for obtaining strength and hardness.
• 4. Examine the mechanisms of materials failure through fatigue and creep

UNIT - I

Introduction, Importance of testing Hardness Test: Methods of hardness testing – Brinell, Vickers, Rockwell hardness tests. The Impact Test: Notched bar impact test and its significance, Charpy and Izod Tests, fracture toughness testing - COD and CTOD tests, significance of transition temperature curve.

UNIT - II

The Tension Test: Engineering stress-strain and True stress-strain curves. Tensile properties, conditions for necking. Stress-Strain diagrams for steel, Aluminum and cast iron.

UNIT - III

Fatigue Test: Introduction, Stress cycles, S-N Curve, Effect of mean stress, Mechanism of fatigue failure, Effect of stress concentration, size, surface condition and environments on fatigue.

UNIT - IV

Creep and Stress Rupture: Introduction, The creep curve, Stress-rupture test, Structural changes during creep, Mechanism of creep deformation, theories of creep. Fracture at elevated temperature.

UNIT - V

NDT: Principle, Operation, Advantages and Limitations of Liquid Penetrant, Magnetic Particle, Radiography and Ultrasonic tests.

TEXT BOOKS:

• 1. Mechanical Metallurgy – G. E. Dieter, Third edition, published by New York Mc GrawHill,1986.
• 2. Mechanical behavior - Ed. Wulf.

REFERENCE BOOKS:

• 1. Mechanical Metallurgy – White & Lemay.
• 2. Testing of Metallic Materials - A.V.K. Suryanarayana