JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-Requisites

Nil

Course Objectives:

• Understanding the basic principles of various non-destructive testing methods, fundamentals, discontinuities in different product forms.
• Differentiate various defect types and select the appropriate non-destructive testing methods for better evaluation of the specimen.
• Implement and document a written procedure paving the way for further training in specific techniques of non-destructive inspection of the experimental subject.
• Recognize the principles and operational techniques of the radiographic testing followed by its interpretation and evaluation.

Course Outcomes:

• Different type of testing
• Principles of electronic measurement devices

UNIT - I

Overview of Non-Destructive Testing: NDT versus mechanical testing, overview of the non- destructive testing methods for the detection of manufacturing defects as well as material characterization; Relative merits and limitations, various physical characteristics of materials and their applications in NDT, visual inspection, v unaided and aided.

UNIT - II

Surface Non-Destructive Examination Methods: Liquid Penetrant Testing: Principles, types and properties of liquid penetrants, developers, advantages and limitations of various methods, Testing Procedure, Interpretation of results; Magnetic particle testing: Theory of magnetism, inspection materials magnetisation methods, interpretation and evaluation of test indications, principles and methods of demagnetization, residual magnetism.

UNIT - III

Thermography and Eddy Current Testing (ET): Thermography: Principles, contact and non-contact inspection methods, Techniques for applying liquid crystals. Advantages and limitation, infrared radiation and infrared detectors, instrumentations and methods, applications; Eddy Current Testing: Generation of eddy currents, properties of eddy currents, Eddy current sensing elements, probes, instrumentation, types of arrangement, applications, advantages, limitations, interpretation/evaluation.

UNIT - IV

Ultrasonic Testing (UT) and Acoustic Emission (AE): Ultrasonic Testing: Principle, transducers, transmission and pulse-echo method, straight beam and angle beam, instrumentation, data representation, A-scan, B-scan, C-scan; Phased array ultrasound, time of flight diffraction; Acoustic emission technique, V principle, AE parameters, applications.

UNIT - V

Experimental Methods: Principle, interaction of X-Ray with matter, imaging, film and film less techniques, types and use of filters and screens, geometric factors, inverse square, law, characteristics of films, graininess, density, speed, contrast, characteristic curves, pentameters, exposure charts,

radiographic equivalence. Fluoroscopy; Xerox; Radiography, computed radiography, computed tomography.

TEXT BOOKS:

• 1. Baldev Raj, T. Jayakumar, M. Thavasimuthu ―Practical Non-Destructive Testing, Narosa Publishing House, 2009.
• 2. Ravi Prakash, ―Non-Destructive Testing Techniques, 1st revised edition, New Age International Publishers, 2010.

REFERENCE BOOKS:

• 1. Paul E Mix, ―Introduction to Non-destructive testing: a training guide, Wiley, 2nd Edition New Jersey, 2005.
• 2. Charles, J. Hellier, ―Handbook of Non-destructive evaluationǁ, McGraw Hill, New York 2001.