Engineering topics
Publications and source records attributed to Gardner, C. G..
Ultrasonic testing is discussed as a primary means of nondestructive evaluation of subsurface flaws. The advantages and disadvantages are listed. The elementary principles, basic components of test units, scan modes, resonance testing, detection of fatigue cracks, monitoring fatigue crack growth, and determination of residual stress are discussed.
Radiography is discussed as a method for nondestructive evaluation of internal flaws of solids. Gamma ray and X-ray equipment are described along with radiographic film, radiograph interpretation, and neutron radiography.
Brief accounts are included of three nondestructive evaluation methods that have been introduced within the past few years: (1) acoustic emission, (2) the use of coherent (laser) light, and (3) ultrasonic holography.