JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives

The objective of the course is to introduce various non-destructive evaluation

techniques applied to impact and test quality of manufacture products obtained by various manufacturing techniques such as welding, rolling, forging, casting, powder metallurgy etc. This subject also provides certification aspects of commercial products.

Course Outcomes

Upon completion of this course, the student will be able to:

• Decide, select, use and interpret proper nondestructive methods for inspection and evaluation of engineering materials
• Evaluate the materials and structures for the causes of discontinuities, which interfere with the usefulness of the part
• Design nondestructive methods for inspection and evaluation of materials
• Design nondestructive methods for systems for quality assurance including production processes and assemblies

UNIT - I

Introduction, visual methods: Optical aids, In-situ metallography, Optical holographic methods, Dynamic inspection. Other methods, Acoustic Emission methods, Acoustic methods, Leak detection, Thermal inspection.

UNIT - II

Penetrant flaw detection: Principles, Process, Penetrant systems, Liquid-penetrant materials, Emulsifiers, cleaners developers, sensitivity, Advantages, Limitations, Applications. Magnetic methods, Advantages, Limitations, Methods of generating fields, magnetic particles and suspending liquids Magnetography, field sensitive probes, applications. Measurement of metal properties.

UNIT - III

Radiographic methods: Limitations, Principles of radiography, sources of radiation, Ionising radiation - X-rays sources, Gama-rays sources Recording of radiation, Radiographic sensitivity, Fluoroscopic methods, special techniques, Radiation safety.

UNIT - IV

Ultrasonic testing of materials: Advantages, disadvantages, Applications, Generation of. Ultrasonic waves, general characteristics of ultrasonic waves, methods and instruments for ultrasonic materials testing, special techniques.

UNIT - V

Electromagnetic testing: Magnetism, Magnetic domains, Magnetization curves, Magnetic Hysteresis, Hysteresis-loop tests, comparator - bridge tests Absolute single-coil system, applications. Electrical methods, Eddy current methods, potential-drop methods, applications, Thermal Imaging

TEXT BOOKS:

• 1. Non-Destructive Testing by P. Halmshaw
• 2. Practical Non Destructive testing, Baldev Raj, T. Jayakumar, M. Thavasimuthu, Woodhead Publishing, 2002

REFERENCE BOOK:

• 1. ASM Metals Handbook, Nondestructive inspection and quality control.