Which method is an example of non-destructive testing (NDT)?

Non-destructive testing (NDT) refers to methods that assess the properties or integrity of a material, component, or assembly without causing any damage. Ultrasonic testing is a prime example of NDT, where high-frequency sound waves are transmitted through a material to identify flaws or to measure thickness. This method allows for the detection of internal defects without affecting the structural integrity of the item being tested.

Magnetic particle inspection and X-Ray analysis also serve as non-destructive testing methods. Magnetic particle inspection detects surface and near-surface discontinuities in ferromagnetic materials, while X-Ray analysis can reveal internal structures and flaws without physical alteration to the item. Destructive material testing, in contrast, involves breaking or damaging a specimen to evaluate its performance, which clearly falls outside the category of non-destructive methods.