ME683A
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Techniques in Non-destructive Evaluation
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Concise Syllabus
To introduce the methods to detect inhomogeneities (cracks, delaminations, corrosion) in macrostructures using non-invasive methods such as thermography, ultrasonics, and computer vision. Experiments will be demonstrated for all three techniques.
Lecture-wise Break Up
I. Introduction
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Need for and overview of NDE; Applications of NDE for different types of defects in metals, composites, and ceramics; Measurements of displacement, stress, and strain; Sensor characteristics, signal conditioning, data reduction, and choice of sensors; General solutions of hyperbolic and parabolic PDEs [6]
II. Thermal NDE
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Thermography: From black body radiation to principles of thermal imaging; Fourier heat diffusion and boundary conditions; Contact and non-contact thermal techniques; Pulsed, pulsed-phase and vibrothermography—theory, experiments, and algorithms for processing data; Fabrication of sensors [10]
III. Ultrasonics
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Christoffel equation and types of boundary conditions; Sensors: Generation and reception. Near-field and far-field measurements; Time-of-fight method: Basics, imaging, and applications; Phased array: Theory and applications; Electromagnetic acoustic transducers: governing equations, construction of transducers, and applications; Guided waves: dispersion relations and applications; Synthetic aperture focused technique; Metamaterials in ultrasound imaging [12]
IV. Computer vision: Optical methods
V. Special topics
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Structural Health monitoring: Computer vision, fibre optics, and acoustic emission; AI in NDE; Shearography; Selection of parameters of instrumentation; Hybrid techniques: eddy-current thermography, laser-ultrasonics [7]
Prerequisites
References
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Xavier PV Maldague, "Nondestructive evaluation of materials by infrared thermography", Springer Science & Business Media, 2012.
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Horatio S. Carslaw and John A. Jaeger, "Conduction of heat in solids", Oxford Science Publications, 1947.
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Tribikram Kundu, "Ultrasonic and electromagnetic NDE for structure and material characterization: Engineering and biomedical applications", CRC Press, 2016.
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Joseph L. Rose, "Ultrasonic Guided Waves in Solid Media", Cambridge University Press, 2014.
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Lester Schmerr, "Fundamentals of ultrasonic non-destructive evaluation", Springer, 2016.
Prepared by
C. Chandraprakash
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