US Army Technical Manual, NONDESTRUCTIVE INSPECTION METHODS, BASIC THEORY, TM 1-1500-335-23, 2007

US Army Technical Manual, NONDESTRUCTIVE INSPECTION METHODS, BASIC THEORY, TM 1-1500-335-23, 2007


PURPOSE.
Nondestructive Inspection (NDI) is the inspection of a structure or component in any manner that will not impair its future
usefulness. The purpose of the inspection may be to detect flaws, measure geometric characteristics, determine material
structure or composition, or it may characterize physical, electrical, or thermal properties without causing any changes in the
part. The five standard NDI disciplines include:
Liquid Penetrant
Magnetic Particle
Eddy Current
Ultrasonic
Radiography